401(k) glossary
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Contributions & limits
Safe harbor match
Short definition
A safe harbor match is an employer matching formula that meets the IRS safe harbor rules. The basic formula is 100% of the first 3% of pay an employee defers plus 50% of the next 2%, vested immediately.
What a safe harbor match is
A safe harbor match is the matching contribution an employer promises in a safe harbor 401(k). There are three versions:
Formula | Match | Most the employer pays |
|---|---|---|
Basic | 100% of the first 3% of pay deferred, plus 50% of the next 2% | 4% of pay |
Enhanced | Any formula at least as generous as basic at every deferral level, commonly 100% of the first 4% | Set by the plan |
QACA (with automatic enrollment) | 100% of the first 1%, plus 50% of the next 5% | 3.5% of pay |
Basic and enhanced matches must be 100% vested when made. A QACA match can use a vesting schedule of up to two years. The alternative to a match is a nonelective contribution of at least 3% of pay to every eligible employee, whether or not they defer.
Why it matters to employers
The formula sets your cost and decides which tests you skip. A match that stays within the safe harbor rules is deemed to pass the ACP test. To keep that pass, the match rate cannot rise as deferrals rise, and the plan cannot match deferrals above 6% of pay.
Example with 2026 figures
An employee earns $60,000 and defers 6% ($3,600). Basic match: $1,800 plus $600, or $2,400. Enhanced match at 100% of 4%: $2,400. QACA match: $600 plus $1,500, or $2,100. Pay above $360,000 is ignored when you calculate any match in 2026.
Common mistakes
Calculating the match each pay period when the plan document says annual, or the reverse, and skipping the true-up.
Excluding bonuses or commissions from match pay when the plan’s definition of compensation includes them.
Adding a discretionary match on top without checking whether it brings ACP testing back.
Depositing per-payroll matches late. Safe harbor matches calculated by pay period are due by the end of the following plan-year quarter.
Basic Capital and this term
Basic Capital’s Safe Harbor 401(k) supports the basic match, an enhanced match or the 3% nonelective contribution.
Go deeper
Read the full employer guide related to: Safe harbor match
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Sources
eCFR (National Archives): 26 CFR 1.401(k)-3: Safe harbor requirements (https://www.ecfr.gov/current/title-26/chapter-I/subchapter-A/part-1/section-1.401(k)-3), retrieved 2026-11-11 Internal Revenue Service: 401(k) plan overview (https://www.irs.gov/retirement-plans/plan-sponsor/401k-plan-overview), retrieved 2026-11-11 Internal Revenue Service: Is my 401(k) top-heavy? (https://www.irs.gov/retirement-plans/is-my-401k-top-heavy), retrieved 2026-11-11 Internal Revenue Service: Notice 2025-67: 2026 amounts relating to retirement plans and IRAs (https://www.irs.gov/pub/irs-drop/n-25-67.pdf), retrieved 2026-11-11 Internal Revenue Service: 401(k) plans: Deferrals and matching when compensation exceeds the annual limit (https://www.irs.gov/retirement-plans/401k-plans-deferrals-and-matching-when-compensation-exceeds-the-annual-limit), retrieved 2026-11-11
General information, not legal or tax advice.
