
Safe Harbor 401(k) Plans in 2026: How Small Businesses Skip Nondiscrimination Testing
A safe harbor 401(k) automatically passes IRS ADP/ACP nondiscrimination testing in exchange for a fixed employer contribution — a 3% nonelective or a match of up to 4%. Here's how the three formulas compare in cost, the December 1 retroactive adoption deadline, and the 2026 limits ($24,500 deferral, $72,000 total additions, mandatory Roth catch-ups for high earners).










