401(k) vs IRA: Contribution Limits and Tax Rules 2026

For new retirement contributions, first examine the employer match and its vesting terms. Once you are capturing the match you expect to retain, compare the plan’s investments and total fees with an eligible IRA. An IRA can add investment choice; the 401(k) provides a much larger employee contribution limit. Eligible savers can use both.

The figures below are federal 2026 limits, checked November 3, 2026. Compensation, plan provisions, and tax eligibility determine how much of each limit you can use. The examples show how contributions, employer matching, and fees interact.

The 2026 contribution limits

The IRS’s 2026 announcement and catch-up guidance distinguish the regular employee limit from catch-up contributions.

Limit	401(k), other than a SIMPLE 401(k)	Traditional and Roth IRAs combined
Regular contribution or employee deferral	$24,500	$7,500
General catch-up for age 50 or older	$8,000	$1,100
Total with general catch-up	$32,500	$8,600
Higher catch-up for someone turning 60, 61, 62 or 63	$11,250 instead of $8,000	No separate higher catch-up
Total using that higher catch-up	$35,750	$8,600

Traditional and designated Roth employee 401(k) deferrals share the employee limit; electing both does not double it. Likewise, the IRA limit is combined across traditional and Roth accounts. IRS IRA guidance also limits regular contributions by taxable compensation, with a spousal-IRA rule for eligible joint filers.

An eligible person under 50 can have up to $32,000 of regular contribution room across the two arrangements: $24,500 in employee 401(k) deferrals plus $7,500 in IRAs. Check the IRA deduction or Roth income limits separately when deciding which tax treatment is available.

The employer-contribution limit is a different calculation

The IRS cost-of-living table lists a $72,000 defined-contribution limit for 2026. The annual-additions rules generally cover employer contributions, regular employee deferrals and employee after-tax contributions, subject also to the applicable compensation limit. Eligible catch-up contributions are excluded from that annual-additions ceiling.

The plan determines its employer contribution formula and whether it accepts employee after-tax contributions. Read those provisions before calculating how much of the $72,000 annual-additions limit is usable.

For example, $24,500 of regular deferrals plus a $6,000 employer contribution equals $30,500, leaving $41,500 below the $72,000 ceiling. Additional contributions require a permitted contribution type and compliance with plan rules and testing. Ask the administrator for the actual remaining room before arranging an after-tax contribution.

Beginning in 2026, the IRS says catch-up contributions for affected participants must be Roth where prior-year wages from the plan sponsor exceeded $150,000. This is a separate rule from direct Roth IRA income limits. It does not convert every regular 401(k) deferral into a mandatory Roth contribution.

Read the match formula and vesting schedule

The Department of Labor’s retirement-plan guide explains that employees are fully vested in their own contributions and related earnings. Employer contributions can have a vesting schedule. The summary plan description explains participation, benefits and other operating terms.

Suppose an employer matches 50% on the first 6% of eligible pay. At $60,000 annual pay, contributing $3,600 produces a $1,800 employer contribution, subject to the plan’s conditions. Increasing contributions beyond that matched band adds retirement savings without increasing this particular match.

If only 40% of that employer contribution is vested when the person leaves, the vested part of the $1,800 is $720, ignoring investment changes. The employee’s own $3,600 is a separate amount and remains vested. These figures illustrate why an account balance and the amount the employee can retain may differ.

Check how the formula is applied through payroll and whether the plan reconciles matching at year-end. Do not assume that changing contribution timing produces the same match under every plan.

Tax treatment and investment selection are separate decisions

An eligible 401(k) may offer traditional and designated Roth deferrals. An IRA may be traditional or Roth. The traditional-versus-Roth guide explains the different tax treatment and the actual 2026 income ranges.

Workplace coverage can limit the traditional IRA deduction even when the contribution itself is permitted. Direct Roth IRA contributions also have income limits. The absence of a Roth IRA income limit on designated Roth 401(k) deferrals does not remove the employer plan’s contribution limits.

Compare the specific investment menus and services. A low-cost 401(k) menu may be attractive after the match; an IRA may offer suitable funds missing from the plan. Compare products with similar investment exposure and include both account charges and fund expenses.

Compare administration and investment fees together

The Department of Labor’s fee guide separates plan administration, investment and individual-service fees. Some charges are deducted directly from an account, while fund expenses reduce investment returns. Optional services may have separate costs.

For a hypothetical unchanged $40,000 balance, a 0.10% investment expense costs about $40 annually. Adding a $48 administration charge brings the total to $88, or 0.22%. An alternative charging 0.20% with no separate account fee would cost about $80 under the same assumptions.

In that example, the account with the higher fund expense is $8 cheaper overall. Use actual plan disclosures and custodian schedules to repeat the comparison at your balance. Include any services you need, since an optional advice fee can change the total.

Loans and required distributions differ

The IRS loan FAQ says a qualified plan may offer loans but does not have to. IRA loans are prohibited. For plan loans, the commonly cited $50,000 figure is only part of the calculation; vested balance, existing loans and plan provisions also matter. A loan is not an unrestricted withdrawal, and failure to meet repayment requirements can have tax consequences.

IRS RMD guidance states that original owners have no lifetime required minimum distributions from Roth IRAs or designated Roth 401(k)/403(b) accounts. Beneficiaries have separate distribution requirements.

Traditional accounts have required-distribution rules, with starting age determined by birth year. Certain current-employer plan participants can delay distributions until retirement if permitted, while traditional IRAs do not have that working exception. Confirm the specific rule before assuming a job automatically postpones every retirement-account withdrawal.

Evaluate a rollover before changing custodians

When leaving an employer, compare retaining eligible assets in the current plan, moving them to an accepting new employer plan, and rolling eligible funds to an IRA. Favor the arrangement whose costs, investment options, and plan benefits fit the account. Taking a distribution can trigger tax and additional-tax consequences, so calculate those before cashing out.

The IRS rollover guide explains direct rollovers and the usual 60-day rule for an eligible distribution paid to the participant. Taxable eligible employer-plan distributions paid to the person generally have 20% withholding.

For a hypothetical $10,000 taxable eligible distribution paid to the participant, $2,000 withholding leaves an $8,000 check. Rolling over only the check does not roll over the full $10,000. Completing a full rollover within the applicable period would require replacing the withheld $2,000 from other funds. A direct rollover avoids that withholding problem. Not every distribution is eligible, and a Roth conversion can create income even when money moves directly.

For a new contribution, record the available match, vested value, total fees, investment options, and IRA tax eligibility. For a rollover, obtain the vested balance and rollover notice as well. These comparisons separate two decisions: where the next dollar of savings belongs and where an existing retirement balance is best held.

Sources

• IRS: 2026 limits, catch-ups, IRA limits and defined-contribution limits.
• DOL: Understanding a retirement plan and 401(k) fees.
• IRS: Plan loans, required distributions and rollovers.