401(k) Calculators
Safe Harbor 401(k) Match Calculator
Four formulas, two very different vesting rules — the classic safe harbor match is richer but vests immediately, while QACA is leaner but lets employers require up to two years of service first.
Calculate the safe harbor match
2026 limits — compensation capped at $360,000 per the IRS 401(a)(17) limit.
This is a planning estimate — plan documents govern the exact formula in effect. Confirm with your plan administrator.
Why employers adopt safe harbor at all
A safe harbor 401(k) automatically satisfies the ADP/ACP nondiscrimination tests and top-heavy testing that otherwise limit how much highly compensated employees and owners can defer, based on how much lower-paid employees participate. In exchange for guaranteeing a specific employer contribution to eligible employees, the business avoids the risk of contribution refunds or corrective distributions if a nondiscrimination test would otherwise fail — letting owners and highly compensated staff defer up to the full IRS limit with confidence.
The four common formulas
| Formula | How it works | Max match |
|---|---|---|
| Basic match | 100% on first 3% deferred, 50% on next 2% | 4%, reached at 5% deferral |
| Enhanced match | Common version: 100% on first 4% deferred | 4%, reached at 4% deferral |
| Non-elective | 3% of pay to everyone, regardless of deferral | 3% flat, no deferral required |
| QACA basic match | 100% on first 1% deferred, 50% on next 5% | 3.5%, reached at 6% deferral |
Enhanced formulas can be customized further, as long as they're at least as generous as the basic formula at every deferral level and don't require more than 6% deferral to reach the maximum match.
The real tradeoff: richer match vs. flexible vesting
QACA comes with auto-enrollment strings attached
A QACA isn't just a cheaper match formula — it requires automatically enrolling employees who don't make an affirmative election, starting at a 3% default deferral rate that increases 1% annually until it reaches at least 6% (capped at 10% during the initial period, up to 15% after). Employees can always opt out or choose their own rate, but the default is genuinely "in" unless they act.
The 2026 compensation cap
All safe harbor formulas apply only to compensation up to the IRS Section 401(a)(17) limit — $360,000 for 2026, up from $350,000 in 2025. An employee earning $400,000 has their match calculated on only $360,000 of that pay, capping the basic match's employer cost at $14,400 (4% of $360,000) for that individual, regardless of how much higher their actual salary runs.
The safe harbor formula structures, the 2026 compensation cap, and the classic-vs-QACA vesting distinction verified across multiple independent 2026 retirement plan guides showing consistent detail, cross-referencing official IRS figures. This is a planning estimate — a plan administrator or ERISA attorney should confirm the exact formula and vesting terms in your specific plan document.
Frequently asked questions
Before you choose a safe harbor formula.
What's the difference between basic and enhanced safe harbor match?
Basic match is 100% on the first 3% deferred plus 50% on the next 2%, maxing at 4% for a 5% deferral. Enhanced match must be at least as generous at every level - a common version is 100% on the first 4% deferred, reaching the same 4% max at a lower deferral rate.
Do safe harbor contributions vest immediately?
Classic safe harbor contributions (basic, enhanced, and non-elective) must be 100% vested immediately. QACA safe harbor contributions are the exception - employers can require up to a two-year cliff vesting schedule instead.
What is a QACA safe harbor plan?
A Qualified Automatic Contribution Arrangement pairs a leaner matching formula (100% on the first 1% deferred, 50% on the next 5%, maxing at 3.5%) with automatic enrollment of employees who don't make an affirmative election.
What is the 2026 compensation cap for safe harbor contributions?
$360,000, per the IRS Section 401(a)(17) limit, up from $350,000 in 2025. Contributions are calculated only on compensation up to this cap.
Does a non-elective safe harbor contribution require employees to contribute anything?
No - unlike a match, a non-elective contribution of at least 3% of pay goes to every eligible employee regardless of whether they defer any of their own pay into the plan.