A safe harbor plan’s basic matching formula is fixed by law in exchange for exemption from annual nondiscrimination testing, with matching contributions vesting immediately.
How it works
The employer matches 100% of the first 3% of compensation an employee defers, plus 50% of the next 2% deferred — a maximum 4% match reached once an employee defers 5% or more.
What this does not include
This computes the basic matching formula only — safe harbor plans can alternatively use an enhanced match or a 3% nonelective contribution (paid to all eligible employees regardless of their own deferral), both of which use different formulas than this calculator.
How to use this calculator
- Enter employee compensation and the employee’s deferral rate.
Frequently asked questions
Why do employers choose a safe harbor design?
It exempts the plan from annual ADP/ACP nondiscrimination testing, removing the risk that highly compensated employees’ contributions must be refunded if the plan fails those tests.
Must safe harbor contributions vest immediately?
Yes — unlike some other employer 401(k) contributions that can vest gradually over several years, safe harbor contributions must be 100% vested as soon as they’re made.
Can an employer change from safe harbor to a standard 401(k) design?
Yes, generally with advance notice to employees before the plan year, subject to specific IRS timing and notice requirements for making such a change.
