401(k) Guide 2025: Contribution Limits, Employer Match, and Rollovers
Last updated: May 23, 2026 · 14 min read
The 401(k) is the cornerstone of retirement savings for most American workers. Understanding how to maximize contributions, capture employer matching, choose investments, and manage rollovers can add hundreds of thousands of dollars to your retirement nest egg.
Educational Content — Not Tax Advice
401(k) rules and limits change annually. Consult a CPA or CFP for personalized advice. Verify current limits at IRS.gov.
Key Takeaways
- ▸2025 employee contribution limit: $23,500 ($31,000 if age 50+; $34,750 if age 60-63)
- ▸Always contribute enough to get 100% of your employer match — it's an immediate 50-100% return
- ▸Leaving a job: roll over to IRA for most flexibility and investment options
- ▸Early withdrawal before 59½ = income tax + 10% penalty (with limited exceptions)
- ▸RMDs start at age 73; Roth 401(k) has no RMDs starting 2024 (SECURE 2.0)
What Is a 401(k)?
A 401(k) is an employer-sponsored defined contribution retirement savings plan named after the section of the Internal Revenue Code that authorizes it. Unlike a traditional pension (defined benefit plan), a 401(k) puts the responsibility for saving and investing on the employee.
How it works: You elect to contribute a percentage of each paycheck to your 401(k) before income taxes are calculated (Traditional) or after taxes (Roth). Your employer may match a portion of your contributions. The money grows tax-deferred (Traditional) or tax-free (Roth) until retirement.
Source: IRS 401(k) Plans · DOL.gov 401(k)
2026 Contribution Limits — Historical Context
| Year | Employee Limit | Catch-Up (50+) | Total Limit |
|---|---|---|---|
| 2020 | $19,500 | $6,500 | $57,000 |
| 2021 | $19,500 | $6,500 | $58,000 |
| 2022 | $20,500 | $6,500 | $61,000 |
| 2023 | $22,500 | $7,500 | $66,000 |
| 2024 | $23,000 | $7,500 | $69,000 |
| 2025 ★ | $23,500 | $7,500 ($11,250 age 60-63) | $70,000 |
Source: IRS Retirement Topics
Employer Matching: The #1 Priority
Employer matching is the most powerful benefit in a 401(k). Common match formulas include:
100% up to 3%
$80,000 salary: contribute 3% ($2,400) → get $2,400 free
Full match on first 3% of salary
50% up to 6%
$80,000: contribute 6% ($4,800) → get $2,400 (50%)
Most common formula in US plans
100% up to 6%
$80,000: contribute 6% ($4,800) → get $4,800
Generous employer match
No match
Some employers offer no match, especially smaller companies
Still valuable for tax advantages
Golden Rule
Never leave employer match money on the table. If your employer matches 50% on the first 6% of salary, contributing less than 6% is forfeiting part of your compensation. This is the single highest-return investment available — a guaranteed 50% instant return before any market gains.
Vesting Schedules
Your contributions are always 100% vested immediately. Employer contributions follow a vesting schedule — you only keep them if you stay long enough.
Immediate Vesting
100% vested from day one. Rare but best for employees.
3-Year Cliff
0% for years 1-2, 100% at year 3. Common in many plans.
6-Year Graded
20%/year from years 2-6: 0%, 20%, 40%, 60%, 80%, 100%.
4-Year Graded
25%/year: 25% at yr 1, 50% at yr 2, 75% at yr 3, 100% at yr 4.
401(k) Rollover Options When Leaving a Job
Roll to IRA
Recommended+ Most investment choices, one account, full control
- No loan option, no age-55 rule
Roll to New Employer's 401(k)
+ Keep loan option, creditor protection, simpler
- Limited to new plan's investment menu
Leave in Old Plan
+ No action needed, familiar investments
- Harder to manage, may have higher fees
Cash Out (Avoid!)
+ Immediate cash
- Income tax + 10% penalty if under 59½. Destroys compound growth.
Related Guides
Frequently Asked Questions
What is the 401(k) contribution limit for 2026?+
For 2025, the employee elective deferral limit is $23,500. Workers age 50 and older can make an additional catch-up contribution of $7,500, for a total of $31,000. The combined employer + employee limit (total annual additions) is $70,000. A new provision under SECURE 2.0 allows workers aged 60-63 to make a higher catch-up contribution of $11,250 instead of $7,500, for a total of $34,750.
What is employer matching in a 401(k)?+
Employer matching is when your employer contributes money to your 401(k) based on your own contributions. A common formula is '50% match on the first 6% of salary' — meaning if you earn $80,000 and contribute 6% ($4,800), your employer adds $2,400. Always contribute at least enough to capture the full match — it's effectively an immediate 50-100% return on your investment before any market gains.
What happens to my 401(k) if I leave my job?+
You have four options: (1) Leave it in your former employer's plan if the plan allows; (2) Roll it over to your new employer's 401(k); (3) Roll it over to a Traditional IRA (most flexible option); (4) Cash it out — not recommended as this triggers income tax plus a 10% early withdrawal penalty if under 59½. A direct rollover to IRA avoids all taxes and penalties and gives you more investment choices.
What is vesting in a 401(k)?+
Vesting determines when employer contributions become fully yours. Your own contributions are always 100% vested immediately. Employer matching follows a vesting schedule — cliff vesting (e.g., 100% after 3 years) or graded vesting (e.g., 20% per year for 5 years). If you leave before being fully vested, you forfeit unvested employer contributions. Always check your vesting schedule before leaving a job.
Can I withdraw from my 401(k) before 59½?+
Yes, but early withdrawals (before age 59½) are subject to ordinary income tax plus a 10% penalty. Exceptions include: substantially equal periodic payments (SEPP/Rule 72(t)), separation from service at age 55 or older, disability, death, certain medical expenses, and qualified domestic relations orders. The SECURE 2.0 Act (2022) expanded penalty exceptions including emergency withdrawals up to $1,000/year.
What is the difference between Traditional 401(k) and Roth 401(k)?+
Traditional 401(k): contributions are pre-tax (reduce current taxable income), investments grow tax-deferred, withdrawals in retirement are taxed as ordinary income. Roth 401(k): contributions are after-tax (no current tax benefit), but qualified withdrawals in retirement are completely tax-free including earnings. Both have the same contribution limits. Choose Roth if you expect to be in a higher tax bracket in retirement; Traditional if you expect lower rates in retirement.
What is an RMD from a 401(k)?+
Required Minimum Distributions (RMDs) are mandatory withdrawals from Traditional 401(k) accounts starting at age 73 (under SECURE 2.0). The annual RMD is calculated by dividing your account balance by an IRS life expectancy factor (Uniform Lifetime Table). Failure to take the full RMD triggers a 25% excise tax on the shortfall (reduced from 50% by SECURE 2.0). If you're still working at 73, you can delay RMDs from your current employer's 401(k) until you retire.
How should I invest my 401(k)?+
Most 401(k) plans offer a menu of mutual funds and sometimes company stock. A simple approach: use a target-date fund matching your expected retirement year (e.g., Target 2050 Fund). If you prefer more control: build a three-fund portfolio of US stock index fund, international stock index fund, and bond index fund. Allocate based on your age — a common formula is (110 - your age) in stocks. Rebalance annually.
401(k) Contribution Strategy: Maximizing Every Dollar
For 2026, the employee contribution limit is $23,500, with a $7,500 catch-up for those aged 50 and older ($31,000 total), and a new SECURE 2.0 provision allowing workers aged 60–63 to contribute $11,250 in catch-up contributions ($34,750 total). The combined employer plus employee limit is $70,000. The contribution hierarchy for most employees: first, contribute enough to capture the full employer match — the average match is 4.3% of salary at 50 cents on the dollar, representing an immediate 50% guaranteed return before any investment gains; never forfeit this. Second, consider maxing an HSA (Health Savings Account) before returning to max out the 401(k) — HSAs offer triple tax advantage (deductible contributions, tax-free growth, tax-free medical withdrawals) unavailable anywhere else. Third, max a Roth IRA (if income eligible) for greater investment flexibility before maxing the 401(k). Then return to max the 401(k) to $23,500.
For employees whose 401(k) plans allow after-tax (non-Roth) contributions, the mega backdoor Roth is one of the most powerful tax-advantaged strategies available. After exhausting the $23,500 pre-tax/Roth limit and receiving employer contributions, any remaining room up to the $70,000 total limit can be filled with after-tax contributions, then converted in-plan to Roth — enabling an additional $30,000–$40,000 in annual Roth contributions for high earners in generous plans. Not all plans offer this feature; check your Summary Plan Description.
Auto-escalation is one of the most effective behavioral finance tools for retirement savings. Most plans allow setting automatic annual contribution rate increases — adding 1% of salary each year without requiring a conscious decision. An employee starting at 6% contributions at age 25 who auto-escalates 1% annually will be contributing 16% by age 35, well ahead of the 15% commonly recommended by financial planners. The behavioral insight: small incremental changes feel painless whereas large deliberate increases face psychological resistance.
- →Priority 1: Always contribute enough to capture full employer match — leaving match unclaimed is forfeiting compensation.
- →Priority 2: Max HSA ($4,300 single / $8,550 family 2026) before maxing 401(k) — triple tax advantage is unmatched.
- →Mega backdoor Roth: if plan permits after-tax contributions, convert to Roth in-plan for up to $70K total annual Roth contributions.
- →Auto-escalation: set +1%/year automatic increase — behavioral tool that builds savings rate gradually without conscious effort.
Investment Options Inside a 401(k): What to Choose and Avoid
The quality of investment options varies dramatically between 401(k) plans, and expense ratios have an enormous compounding impact over decades. A 1% annual expense ratio difference — entirely common between an actively managed fund and an index fund — costs approximately $100,000 on a $500,000 portfolio over 20 years, assuming 7% gross return. SPIVA data (S&P Indices Versus Active) consistently shows that 88% of actively managed large-cap US equity funds underperform the S&P 500 over 15-year periods, net of fees. The conclusion: minimize expenses, default to index funds wherever available.
Target-date funds are the simplest and often best option for most 401(k) participants: a single fund that automatically maintains an age-appropriate asset allocation and gradually shifts toward bonds as the retirement date approaches (the glide path). Most plans default new employees into target-date funds. However, expense ratios vary enormously between plan providers — Vanguard target-date funds charge approximately 0.10%, while some insurance-company-managed plans charge 0.50–0.80% for similar products. Always check the expense ratio on the specific fund in your plan.
When building your own allocation: prioritize the lowest-cost index funds available — S&P 500 index funds from Fidelity Spartan, Vanguard Institutional, or Schwab typically have expense ratios of 0.02–0.05%. Stable value funds (often available in 401(k) plans but not in IRAs) are superior to money market funds for the bond-equivalent allocation — they are insurance-wrapped intermediate-term bond portfolios that provide guaranteed principal protection while yielding 1–2% more than money market funds. Some plans offer a BrokerageLink or self-directed window that opens access to thousands of ETFs beyond the standard menu — useful for experienced investors who want specific factor exposures unavailable in the plan's standard lineup.
| Investment Type | Typical Expense Ratio | 15-yr Outperformance vs S&P 500 | Recommendation |
|---|---|---|---|
| S&P 500 Index Fund | 0.02–0.05% | N/A (benchmark) | First choice |
| Target-Date Fund (Vanguard) | ~0.10% | ~80% success rate | Excellent for simplicity |
| Stable Value Fund | 0.20–0.50% | N/A (bond substitute) | Better than MM for bonds |
| Active Large-Cap Fund | 0.50–1.50% | 12% (SPIVA) | Avoid if index available |
401(k) Loans: When They Make Sense (And When They Don't)
A 401(k) loan allows borrowing up to 50% of your vested account balance or $50,000, whichever is less. Repayment is required within 5 years (15 years for loans used to purchase a primary residence). Interest is paid back to yourself — technically there is no interest cost because you are borrowing from and repaying yourself. There is no credit check, no underwriting, and typically no tax impact if the loan is fully repaid on schedule. These features make 401(k) loans superficially attractive.
The hidden costs are significant. Most importantly, the borrowed balance earns no investment return during the loan period — it sits earning the loan interest rate (typically prime + 1%, currently ~8–9%) rather than participating in market growth. In a strong bull market, the opportunity cost of missing equity returns can dwarf the interest rate savings. Second, job loss creates a critical risk: most plans require full repayment within 60–90 days of termination, and any unpaid balance becomes a distribution — taxed as ordinary income and subject to the 10% early withdrawal penalty if under 59½. The double-taxation myth: while it is technically true that you repay with after-tax dollars and will be taxed again at withdrawal, the actual marginal tax impact is only on the interest portion, not the principal.
401(k) loans are most defensible as a true last resort when facing a genuine financial emergency — particularly when the alternative is higher-interest consumer debt. Borrowing at ~8% 401(k) loan rate to pay off 25–30% credit card debt creates a legitimate financial benefit. However, the behavioral risk of normalizing retirement account access as a form of emergency fund is substantial: participants who take one 401(k) loan statistically tend to take more, progressively eroding retirement savings.
- →Opportunity cost: borrowed funds miss market returns — in strong bull markets this hidden cost exceeds the interest savings.
- →Job loss trigger: outstanding loan balance due within 60–90 days of termination — unpaid balance taxed + 10% penalty.
- →Legitimate use case: true emergency with no alternative, or replacing high-rate consumer debt (25%+ credit card) with 8% loan rate.
Roth 401(k) vs Traditional 401(k): The Right Choice
Unlike Roth IRAs, the Roth 401(k) has no income limits — any employee can contribute to a Roth 401(k) regardless of income, making it accessible to high earners who are phased out of direct Roth IRA contributions. Both Roth and Traditional 401(k) options share the same contribution limits ($23,500 in 2026; $31,000 if 50+). The fundamental choice follows the same tax-rate arbitrage logic as the IRA decision: Roth wins when current tax rates are lower than expected retirement rates; Traditional wins when current rates are higher. One important mechanic: employer matching contributions always go into the Traditional pre-tax account regardless of which designation you choose for your own contributions — you cannot direct employer matches to Roth.
A significant SECURE 2.0 change effective January 2024: Roth 401(k) accounts are now exempt from Required Minimum Distributions during the owner's lifetime, eliminating a major disadvantage relative to Roth IRAs. Previously, Roth 401(k) accounts required RMDs just like Traditional 401(k)s (though the distributions were tax-free). The removal of Roth 401(k) RMDs makes Roth 401(k) contributions even more attractive for wealth accumulation and estate planning purposes.
Decision heuristics: younger employees and those in the 12% or 22% tax brackets should generally favor Roth 401(k) contributions — they are paying relatively low tax rates now and benefit from decades of tax-free growth. Older employees in peak earning years in the 32–37% bracket may favor Traditional — the immediate deduction provides a larger guaranteed benefit. A pragmatic middle path is a 70/30 Traditional/Roth split, hedging against tax rate uncertainty while still building both types of assets. This creates flexibility in retirement to draw from whichever source is tax-optimal in any given year.
- →No income limit: Roth 401(k) is available at any income — high earners can contribute even if phased out of Roth IRA.
- →No RMDs (post-2024): SECURE 2.0 eliminated lifetime RMDs on Roth 401(k) — major estate planning advantage restored.
- →Employer match: always goes to Traditional pre-tax side regardless of your Roth election — you will always have some Traditional balance.
- →Hedge strategy: 70% Traditional / 30% Roth split provides tax diversification against uncertain future rate changes.
Leaving a Job: What to Do With Your 401(k)
When changing jobs, the 401(k) rollover decision has long-term financial consequences. You have four options, each with distinct trade-offs. Option 1: Leave in old employer's plan. Advantages: ERISA provides strong creditor protection, no action required, familiar investments. Disadvantages: limited investment menu, multiple accounts to track as career progresses, plan could change terms or merge. Option 2: Roll over to new employer's 401(k). Advantages: consolidates accounts, maintains ability to take 401(k) loans, maintains the "Rule of 55" early access provision (separation from service at 55+ allows penalty-free withdrawals). Disadvantages: quality depends entirely on new employer's plan — if the new plan has poor investment options, this may be worse than an IRA rollover.
Option 3: Roll over to a Traditional IRA is recommended for most people. Advantages: broadest investment universe (virtually any ETF or mutual fund), often lower expense ratios, ability to consolidate multiple old 401(k)s into one account, no restrictions on investment types. Disadvantages: ERISA creditor protection does not extend to IRAs in all states (IRAs have federal protection only up to $1,512,350 in bankruptcy, versus unlimited for qualified plans), you lose the Rule of 55 penalty-free access window, and you lose the ability to take 401(k) loans. Option 4: Cash out — never recommended. Full ordinary income tax applies to the entire balance plus a 10% early withdrawal penalty, effectively destroying 30–40% of the account immediately.
The mechanics of rolling over matter enormously. A direct rollover (trustee-to-trustee transfer) moves funds directly from old plan to new plan or IRA without you ever touching the money — no withholding, no tax event, no deadline pressure. An indirect rollover (60-day rollover) has the plan send you a check with 20% automatically withheld for taxes; you have 60 days to deposit the full amount (including the 20% withheld, which you must supply from other funds) into the new account to avoid taxes and penalties. Failure to complete within 60 days triggers full taxation of the amount not rolled over. Always request a direct rollover to eliminate risk.
- →Best option for most: direct rollover to Traditional IRA — broadest investment choice, lowest fees, easy consolidation.
- →Keep in new 401(k) if: new plan has excellent low-cost index funds and you want to preserve Rule of 55 or loan access.
- →Always use direct rollover: trustee-to-trustee transfer eliminates 20% withholding, 60-day deadline, and accidental tax events.
- →Never cash out: income tax + 10% penalty destroys 30–40% of the balance immediately and eliminates future compounding.
History of the 401(k): From Tax Loophole to National Retirement System
The 401(k) emerged not from deliberate pension policy design but from a tax attorney's creative reading of the Revenue Act of 1978. Ted Benna, a benefits consultant at The Johnson Companies, discovered in 1980 that the newly enacted IRC §401(k) — intended to regulate deferred compensation arrangements for executives — could be interpreted to allow rank-and-file employees to make pre-tax contributions to savings plans funded by salary deferrals. The IRS confirmed this interpretation in 1981 through proposed regulations, and the 401(k) revolution began.
Growth was exponential: from approximately $150 billion in 401(k) assets in 1985 to over $7 trillion by 2020, the 401(k) supplanted traditional defined benefit pension plans as the dominant private sector retirement vehicle in the United States. The shift from defined benefit (employer bears investment risk, guarantees a monthly benefit) to defined contribution (employee bears investment risk, receives a portfolio balance) fundamentally transferred retirement security responsibility from corporations to individuals. Critics argue this created a structural pension adequacy gap; proponents contend it enabled workforce mobility and eliminated the solvency risk of underfunded pension obligations.
The behavioral architecture of 401(k) plans has been progressively refined since 2006 through the Pension Protection Act, which established safe harbor protections for plans implementing automatic enrollment, automatic escalation, and professionally managed default investments (Qualified Default Investment Alternatives — QDIAs, typically target-date funds). These nudge-based design features, drawn from behavioral economics research by Thaler, Benartzi, and Madrian, substantially increased participation and contribution rates without mandating any behavior — preserving individual choice while structurally facilitating better outcomes.
ERISA (Employee Retirement Income Security Act of 1974) governs the fiduciary duties of plan administrators and trustees. Plan fiduciaries must act solely in the interest of participants and beneficiaries, diversify plan investments to minimize risk, follow the terms of the plan document, and pay only reasonable plan expenses. ERISA fiduciary liability is among the most stringent in federal law — breaches can result in personal liability for losses plus disgorgement of profits, class action lawsuits, and DOL enforcement actions. The proliferation of excessive fee litigation since Tibble v. Edison International (2015 Supreme Court) has pushed employers toward lower-cost index fund lineups and greater scrutiny of revenue-sharing arrangements between plan administrators and investment providers.
Today, approximately 600,000 401(k) plans hold over $7.4 trillion in assets for roughly 70 million active participants (Investment Company Institute, 2025). The median account balance for workers aged 55–64 — the demographic nearest to retirement and most dependent on accumulated savings — stands at approximately $185,000, far below the $1 million or more many financial planners recommend for a comfortable retirement with a 4% safe withdrawal rate. This structural adequacy gap remains one of the central policy challenges shaping ongoing retirement legislation including ongoing discussions about mandating automatic payroll deduction IRAs for workers at employers who do not sponsor any qualified plan.
Source: DOL ERISA Overview · IRS Qualified Plan Requirements · ICI Retirement Data
Early Withdrawal Rules and SECURE 2.0 Exceptions
Withdrawals from a Traditional 401(k) before age 59½ are ordinarily subject to ordinary income tax plus a 10% early distribution penalty. However, the Internal Revenue Code lists specific exceptions that waive the 10% penalty — though income tax still applies to pre-tax funds. The SECURE 2.0 Act of 2022 (effective January 2024) significantly expanded these exceptions, creating new categories of penalty-free early access that financial planners and plan participants should understand in detail.
| Exception | Penalty Waived? | Key Conditions | Added By |
|---|---|---|---|
| Age 59½+ | Yes | No conditions beyond age | Original IRC §72(t) |
| Rule of 55 (Separation) | Yes | Separated from employer at age 55+ in year of separation | IRC §72(t)(2)(A)(v) |
| SEPP / Rule 72(t) | Yes | Substantially Equal Periodic Payments — must continue 5 yrs or to 59½ (whichever later) | IRC §72(t)(2)(A)(iv) |
| Disability | Yes | Total and permanent disability per IRS definition | IRC §72(m)(7) |
| Death Distribution | Yes | Beneficiary withdrawal after account holder's death | IRC §72(t)(2)(A)(ii) |
| Unreimbursed Medical | Partial | Expenses exceeding 7.5% of AGI | IRC §72(t)(2)(B) |
| QDRO (Divorce) | Yes | Qualified Domestic Relations Order — to alternate payee | IRC §414(p) |
| Emergency Withdrawal | Yes | Up to $1,000/year for unforeseen personal/family emergency; must repay within 3 years to take another | SECURE 2.0 §115 |
| Terminal Illness | Yes | Certification of terminal illness with life expectancy ≤84 months from physician | SECURE 2.0 §326 |
| Domestic Abuse Survivor | Yes | Up to $10,000 (indexed) or 50% of account; within 1 year of domestic abuse determination | SECURE 2.0 §314 |
| Federally Declared Disaster | Yes | Up to $22,000 from qualified plan; 3-year repayment option | SECURE 2.0 §331 |
The Rule of 55 deserves particular attention for workers considering early retirement. If you separate from your employer in the calendar year you turn 55 or older (age 50 for public safety employees — firefighters, police, corrections officers), you can take penalty-free distributions from the 401(k) associated with that employer. This rule applies only to the most recent employer's plan — funds in IRAs or prior employer plans are not eligible. The strategic implication: early retirees at 55 should leave funds earmarked for ages 55–59½ in the 401(k) rather than rolling everything to an IRA, preserving penalty-free access during that five-year window.
SEPP (Substantially Equal Periodic Payments), also known as 72(t) payments, allow penalty-free withdrawals at any age by committing to a series of substantially equal payments calculated using one of three IRS-approved methods: Required Minimum Distribution Method, Fixed Amortization Method, or Fixed Annuitization Method. The amortization and annuitization methods typically yield higher annual distributions and are calculated using an IRS-designated interest rate (currently approximately 4.5–5%). Once started, SEPP payments must continue unmodified for the longer of five years or until age 59½ — modifying them triggers retroactive penalties plus interest on all prior exempt distributions. SEPP is most useful for early retirees with substantial 401(k) or IRA balances who need a structured income bridge before traditional retirement account access.
Required Minimum Distributions (RMDs): Rules and Calculation
Required Minimum Distributions are mandatory annual withdrawals from Traditional 401(k) and IRA accounts, designed to ensure that tax-deferred retirement savings are eventually taxed. The SECURE Act (2019) raised the RMD starting age from 70½ to 72; SECURE 2.0 (2022) further raised it to age 73 for individuals born between 1951 and 1959, and to age 75 for those born in 1960 or later. Failure to take the full RMD amount triggers an excise tax of 25% on the shortfall (SECURE 2.0 reduced this from the prior 50%), or 10% if corrected within the Correction Window.
The annual RMD amount is calculated by dividing the prior December 31 account balance by the applicable life expectancy factor from the IRS Uniform Lifetime Table (Publication 590-B). Example: if a 75-year-old has a Traditional 401(k) balance of $800,000 on December 31, 2025, the distribution period from the Uniform Lifetime Table for age 75 is 24.6. The 2026 RMD equals $800,000 ÷ 24.6 = $32,520. This amount is added to ordinary income for the year and taxed at the marginal rate. For individuals with multiple 401(k) accounts, the RMD must be calculated and withdrawn separately from each 401(k) account — unlike IRAs, where RMDs can be aggregated across accounts and taken from any single account.
Key SECURE 2.0 RMD changes: Roth 401(k) accounts are now exempt from lifetime RMDs effective January 2024, matching longstanding Roth IRA treatment. Still-working employees aged 73+ can delay RMDs from their current employer's 401(k) plan until they actually retire — this exception does not apply if the employee owns more than 5% of the company sponsoring the plan. Surviving spouses who inherit a 401(k) can now elect to be treated as the decedent for RMD purposes, allowing them to delay distributions based on their own age rather than the decedent's age — a significant planning advantage when the surviving spouse is younger.
| Age | Uniform Lifetime Factor | RMD on $500,000 Balance | RMD on $1,000,000 Balance |
|---|---|---|---|
| 73 | 26.5 | $18,868 | $37,736 |
| 75 | 24.6 | $20,325 | $40,650 |
| 78 | 22.0 | $22,727 | $45,455 |
| 80 | 20.2 | $24,752 | $49,505 |
| 85 | 16.0 | $31,250 | $62,500 |
| 90 | 12.2 | $40,984 | $81,967 |
Source: IRS Publication 590-B, Uniform Lifetime Table. Calculations assume December 31 prior-year balance = stated amount.
Solo 401(k): The Self-Employed Supercharger
The Solo 401(k) — also called the Individual 401(k) or Self-Employed 401(k) — is available to self-employed individuals and small business owners with no full-time W-2 employees other than a spouse. It follows the same contribution limits as employer-sponsored plans ($70,000 combined limit in 2026) but offers a unique structural advantage: the self-employed individual can contribute both as employee AND as employer, allowing dramatically higher contribution rates at equivalent income levels compared to a SEP-IRA.
As the employee, you can defer up to 100% of net self-employment income up to $23,500 (plus $7,500 catch-up if 50+). As the employer, you can make a profit-sharing contribution of up to 25% of net self-employment compensation (calculated after deducting the self-employment tax deduction). Combined, a self-employed individual earning $100,000 net can contribute $23,500 (employee deferral) plus $18,587 (employer contribution at 25% of adjusted compensation) = $42,087 in 2026. A SEP-IRA would allow only the $18,587 employer contribution, producing a $23,500 funding gap.
Contribution capacity
Both employee deferral ($23,500) and employer profit-sharing (25% net compensation) — combined maximum $70,000 in 2026
Roth option
Solo 401(k) supports Roth contributions, unlike SEP-IRA — critical for early-career self-employed in lower tax brackets
Loan provision
Participants can borrow up to 50% of vested balance or $50,000 — unavailable in SEP-IRA or SIMPLE IRA
IRS Form 5500
Plans with assets exceeding $250,000 must file Form 5500-EZ annually — a compliance obligation absent in SEP-IRA
SECURE 2.0 Act: Key Changes Affecting 401(k) Plans
The SECURE 2.0 Act of 2022 (Div. T of the Consolidated Appropriations Act, 2023) represents the most sweeping overhaul of retirement plan regulations since the original SECURE Act of 2019. With over 90 provisions spread across multiple effective dates through 2027, understanding the changes most relevant to 401(k) participants is essential for optimizing retirement strategy. The following summarizes the provisions with broadest applicability.
| Provision | Effective | Impact |
|---|---|---|
| RMD age raised to 73 (75 for born 1960+) | 2023/2033 | More years of tax-deferred compounding before mandatory withdrawals begin |
| Roth 401(k) exempt from lifetime RMDs | Jan 2024 | Roth 401(k) now matches IRA treatment — no forced distributions during owner's lifetime |
| Catch-up contribution increase (age 60–63) | Jan 2025 | Workers aged 60–63 can contribute $11,250 catch-up instead of $7,500 — $3,750 additional annually |
| Emergency savings accounts (linked to 401k) | Jan 2024 | Employers can add Roth-based emergency savings side-car account (up to $2,500); first 4 withdrawals per year penalty-free |
| Emergency personal expense exception | Jan 2024 | Up to $1,000/year penalty-free withdrawal for personal/family emergency; must repay within 3 years |
| Student loan match provision | Jan 2024 | Employers can match employee student loan payments as if they were 401(k) contributions |
| Long-term part-time employee eligibility | Jan 2025 | Part-timers working 500+ hours for 2+ consecutive years (reduced from 3) must be allowed to contribute |
| Automatic enrollment requirement (new plans) | Jan 2025 | New 401(k) plans must auto-enroll eligible employees at 3–10% with annual auto-escalation to 15% |
| Roth catch-up mandatory for high earners | 2026 | Employees earning $145,000+ (indexed) must make catch-up contributions as Roth — pre-tax catch-up no longer permitted |
The automatic enrollment mandate for new plans established after December 29, 2022 represents a major behavioral intervention based on decades of research demonstrating that opt-out enrollment dramatically increases participation rates. The Brigitte Madrian and Dennis Shea study (2001, Quarterly Journal of Economics) found that automatic enrollment increased participation from 49% to 86% among new employees at one large corporation. SECURE 2.0 codifies this finding into law for new plans, requiring 3% initial deferral with annual 1% escalation to at least 10% (maximum 15%). Existing plans established before December 29, 2022 are grandfathered and not subject to the mandate.
The student loan match provision addresses a structural barrier that prevented many younger workers from contributing to retirement plans while managing substantial educational debt. Under the provision, employers can treat qualified student loan repayments as elective deferrals for matching purposes — an employee paying $500/month toward student loans receives the same employer 401(k) match as if they had contributed $500 to the plan directly. The employer match goes into the 401(k), building retirement savings even when the employee cannot divert income from debt repayment. Plan sponsors must track and certify loan repayments through employee attestation.
The mandatory Roth catch-up requirement (effective 2026) for employees earning $145,000 or more is operationally significant for payroll administrators: plans must track FICA wages by participant and route catch-up contributions to the Roth sub-account for qualifying participants. The IRS issued Notice 2023-75 providing a 2-year administrative transition period (2024–2025), giving recordkeepers time to build the necessary payroll integration and participant notification infrastructure. From 2026, non-compliant plans risk losing their qualified plan status — a severe sanction affecting all participants.
Source: Consolidated Appropriations Act 2023, Division T (SECURE 2.0) · IRS SECURE 2.0 Q&A
401(k) vs Global Equivalents: International Comparison
The American 401(k) is one of the most widely imitated defined contribution retirement savings frameworks globally, but each country's equivalent reflects distinct pension philosophy, tax treatment, and regulatory architecture. Understanding how the 401(k) compares to international counterparts is particularly relevant for expatriates, multinational employees, and foreign nationals working in the United States.
| Country | Equivalent | Annual Limit (approx.) | Key Difference from 401(k) |
|---|---|---|---|
| USA | 401(k) | $70,000 (2026) | Benchmark — voluntary, employer-sponsored, defined contribution |
| United Kingdom | Workplace Pension (NEST) | £60,000 / yr | Auto-enrollment mandatory since 2012; employer must contribute minimum 3% of qualifying earnings |
| Australia | Superannuation | A$30,000 concessional / A$120,000 non-concessional | Mandatory employer contribution of 11.5% (rising to 12% by 2025) — not optional for employer |
| Canada | RRSP / DPSP | CAD $31,560 (2025) | No mandatory employer contribution; contribution room accumulates based on prior year earned income |
| Germany | Betriebliche Altersversorgung (bAV) | €7,728 (2026, tax-free) | Employer must offer bAV; insolvency protection via Pensions-Sicherungs-Verein |
| Japan | iDeCo / DC Pension | ¥816,000 / yr (salaried) | Government-subsidized individual pension; contribution limits vary by employment status |
The most notable contrast is Australia's Superannuation system, which mandates employer contributions of 11.5% of ordinary time earnings for virtually all employees — removing the dependency on employee-initiated action that characterizes the US 401(k). As a result, Australian retirement savings participation approaches near-universal coverage, versus approximately 70% of private sector American workers having access to any workplace retirement plan. The downside of mandatory superannuation is reduced employer flexibility and higher regulatory compliance cost for small businesses. The Netherlands operates one of the most sophisticated occupational pension systems globally, with quasi-mandatory sectoral pension funds covering over 80% of workers through collective bargaining agreements and achieving aggregate funded ratios consistently above 110% — far exceeding American pension underfunding benchmarks.
7 Most Costly 401(k) Mistakes
Not capturing full employer match
Forfeiting 50–100% guaranteed return — the most expensive 401(k) mistake for any income level
Cashing out at job change
Income tax + 10% penalty destroys 30–40% immediately. A $50,000 cashout at 35 costs $500,000+ by retirement at 7% growth
Defaulting to money market fund
Leaving 401(k) in stable/cash funds for decades can mean 3–4% annual return instead of 7–9% from diversified equities
Ignoring expense ratios
A 1% annual fee difference on $500,000 over 20 years at 7% growth costs ~$100,000 in forgone wealth
Not increasing contributions after raises
Lifestyle inflation erodes the opportunity to grow savings rate — auto-escalation prevents this behavioral trap
Company stock concentration
Holding >10% in employer stock creates catastrophic correlated risk — if company fails, you lose job AND retirement simultaneously
Failing to update beneficiary designation
Beneficiary designations override wills — an outdated ex-spouse designation can redirect your entire retirement balance
401(k) Glossary
Educational Content — Not Financial or Tax Advice
401(k) rules and limits change annually. This content is for educational purposes only. Consult a qualified CPA or CFP for advice specific to your tax situation and retirement goals.
Sources: IRS.gov · DOL.gov · Investopedia