401(k) Contribution Limits for Highly Compensated Employees

A highly compensated employee can defer up to $24,500 of salary into a 401(k) in 2026, the same statutory ceiling that applies to every participant.¹ In practice, though, 401(k) contribution limits for highly compensated employees often end up lower than the headline number, because nondiscrimination testing ties what top earners can defer to what everyone else in the plan actually saves. Whether you reach the full $24,500 depends on your plan’s design, your coworkers’ savings behavior, and whether your employer has adopted a safe harbor structure.

Who Counts as a Highly Compensated Employee

Two paths lead to the HCE label. If you owned more than 5% of the business at any point during the current or prior year, you are an HCE regardless of pay.² Otherwise, the IRS looks at compensation: for the 2026 plan year, you are an HCE if you earned more than $160,000 from the employer in the prior year.³ Your employer can narrow the group further with a top-paid group election, which restricts the HCE label to the top 20% of employees by compensation.

The 2026 Elective Deferral Ceiling

Every 401(k) participant faces the same base deferral ceiling of $24,500 in combined pre-tax and Roth salary deferrals for 2026.⁴ The cap applies across all 401(k) plans you participate in during the year, not per plan. If you contribute to both a current employer’s plan and a side business’s plan, your combined deferrals still cannot exceed $24,500.

For rank-and-file employees, $24,500 is usually the effective ceiling. For HCEs, it is only the starting point.

How Nondiscrimination Testing Can Lower What You Defer

To prevent plans from mostly benefiting top earners, the IRS requires an annual Actual Deferral Percentage (ADP) test. The test compares the average deferral rate of HCEs to the average deferral rate of non-highly compensated employees (NHCEs). The plan passes if the HCE average falls within whichever of two formulas produces the more generous result:⁵

The HCE average is no more than 125% of the NHCE average.
The HCE average exceeds the NHCE average by no more than 2 percentage points, and is no more than 200% of the NHCE average.

The plan uses whichever formula allows HCEs to defer more. If NHCEs average 2%, HCEs can average up to 4%. If NHCEs average 6%, HCEs can go as high as 8%. At higher NHCE participation rates the 125% formula becomes more favorable: if NHCEs average 10%, HCEs can average up to 12.5%.⁵

A parallel Actual Contribution Percentage (ACP) test uses the same two formulas but applies to employer matching and after-tax employee contributions.⁶ A plan can pass one and fail the other, so both need to be watched.

If your coworkers save at low rates, you could be limited to well under $24,500 even if you want to contribute the maximum.

What Happens When You Exceed the Limit

When a plan fails the ADP or ACP test, the employer typically corrects it by refunding excess contributions to HCEs. Corrective distributions must go out within 2½ months after the end of the plan year, which is generally March 15 for a calendar-year plan.⁵ If the employer misses that deadline, the company owes a 10% excise tax on the excess.

For you, the refunded amount is taxable income in the year it was originally contributed. If the excess is not distributed on time, you risk being taxed twice: once in the contribution year and again when the money is eventually distributed.⁷ You also cannot roll the refunded amount into an IRA or another plan.

Safe Harbor Plans Bypass the Testing Problem

An employer can eliminate ADP and ACP testing by adopting a safe harbor 401(k). In exchange, the company commits to specific, immediately vested contributions to all eligible employees, whether or not those employees defer any of their own pay. A traditional safe harbor plan uses one of three formulas:

Basic match: 100% of the first 3% of compensation deferred, plus 50% of the next 2%.
Enhanced match: a formula at least as generous as the basic match at each deferral level. The most common version matches 100% of the first 4% deferred.
Nonelective contribution: 3% of compensation for every eligible employee, whether or not they contribute.

A Qualified Automatic Contribution Arrangement (QACA) pairs automatic enrollment with a somewhat different employer contribution: 100% of the first 1% deferred plus 50% of the next 5%, or a 3% nonelective contribution.⁸ QACA employer contributions must fully vest within two years of service, while traditional safe harbor contributions vest immediately.

If your employer uses either safe harbor design, you can defer the full $24,500 regardless of what your coworkers contribute.¹

Catch-Up Contributions for Older Workers

If you are 50 or older at any point during 2026, you can contribute an additional $8,000 on top of the $24,500 base, for a total of $32,500 in elective deferrals.¹ Catch-up contributions are not counted in the ADP test, so even if nondiscrimination testing constrains your base deferrals, you can still make the full $8,000 catch-up.⁵

Enhanced Catch-Up at Ages 60 Through 63

SECURE 2.0 created a higher catch-up limit for participants who are 60, 61, 62, or 63 during the plan year. For 2026, this enhanced amount is $11,250 instead of $8,000, bringing the maximum possible elective deferral to $35,750.¹ Once you turn 64, you return to the standard $8,000 catch-up.

Mandatory Roth Catch-Up Starting in 2027

A separate SECURE 2.0 rule will require higher-income participants to designate catch-up contributions as Roth. The IRS issued final regulations in September 2025 confirming the rule applies to taxable years beginning after December 31, 2026.⁹ For 2026, the mandatory Roth rule is not yet in effect, so you can still make pre-tax catch-up contributions regardless of income. Starting in 2027, participants who earned more than $145,000 in FICA wages from the employer in the prior year will need to direct all catch-up contributions to a Roth account.

The Total Annual Addition and Compensation Caps

Beyond your own deferrals, a separate cap restricts the total of everything flowing into your 401(k) in a single year: your deferrals, employer matching, employer profit-sharing, and forfeitures allocated to you. For 2026, this total annual addition limit is $72,000, or 100% of your compensation, whichever is less. Catch-up contributions sit outside this cap, so someone age 50 or older could receive up to $80,000 total, and someone aged 60 through 63 could reach $83,250.¹⁰

A compensation cap also limits how much of your pay the plan can use when calculating employer contributions. For 2026, only the first $360,000 of your compensation counts.³ If you earn $500,000 and your employer matches 5% of pay, the match is calculated on $360,000, not your full salary.

Alternatives When Your 401(k) Is Capped

If nondiscrimination testing or the annual addition limit constrains you, several other vehicles may help.

Nonqualified Deferred Compensation Plans

Some employers offer nonqualified deferred compensation (NQDC) plans designed for executives and other high earners. An NQDC plan has no statutory contribution cap; the maximum depends on the plan’s terms. You defer a portion of salary or bonuses, and taxes on that income are postponed until payout, often at retirement. The trade-off: NQDC assets remain the property of the employer until distributed. If the company goes bankrupt, you are an unsecured creditor and could lose some or all of the deferred amount.

Mega Backdoor Roth Contributions

If your 401(k) plan allows voluntary after-tax contributions (separate from pre-tax or Roth elective deferrals), you can fill the gap between your elective deferrals plus employer contributions and the $72,000 annual addition limit. You then convert those after-tax dollars to a Roth account, either a Roth 401(k) within the plan or a Roth IRA, through an in-plan conversion or rollover. Not every plan permits this, and after-tax contributions from HCEs may still be subject to ACP testing unless the plan has a safe harbor design. Check your plan document before relying on this strategy.

Backdoor Roth IRA

High earners whose income exceeds the Roth IRA contribution thresholds can still fund a Roth IRA indirectly. The approach involves making a nondeductible contribution to a traditional IRA (there is no income limit for that), then converting the balance to a Roth IRA. If you have existing pre-tax IRA balances, the conversion will be partially taxable under aggregation rules, so consult a tax professional first.

The 2026 Numbers at a Glance

Assuming your plan passes nondiscrimination testing or uses a safe harbor design, the 2026 maximums for an HCE work out as follows:

Under age 50: $24,500 in salary deferrals.
Age 50 to 59, or 64 and older: $24,500 plus $8,000 catch-up, totaling $32,500.
Age 60 through 63: $24,500 plus $11,250 catch-up, totaling $35,750.
Total annual additions from all sources, under age 50: $72,000.
Total annual additions from all sources, age 50 to 59 or 64+: $80,000.
Total annual additions from all sources, age 60 through 63: $83,250.

In a plan without safe harbor protections, ADP and ACP testing can reduce your actual elective deferrals well below $24,500 regardless of what the legal ceiling says. If your employer does not offer a safe harbor plan and your coworkers save at low rates, catch-up contributions and the alternatives above become the most reliable paths to building additional retirement savings.

1
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
2
Office of the Law Revision Counsel. 26 USC 414 – Definitions and Special Rules
3
Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living
4
Internal Revenue Service. Retirement Topics – Contributions
5
Internal Revenue Service. 401(k) Plan Fix-It Guide – The Plan Failed the 401(k) ADP and ACP Nondiscrimination Tests
6
eCFR. 26 CFR 1.401(m)-2 ACP Test
7
Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan
8
Internal Revenue Service. FAQs – Auto Enrollment – Are There Different Types of Automatic Contribution Arrangements for Retirement Plans
9
Internal Revenue Service. Treasury, IRS Issue Final Regulations on New Roth Catch-Up Rule, Other SECURE 2.0 Act Provisions
10
Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits