The 2026 safe harbor 401(k) lets workers defer up to $24,500 and lets employers skip ADP and ACP testing with required fully vested contributions. Changes for 2026 add an $11,250 catch-up at ages 60-63, Roth-only catch-ups over $150,000 in prior pay, and auto-enrollment for newer plans.
The Internal Revenue Service states in its 2026 limits announcement that the $24,500 employee limit is up $1,000 from $23,500. The Internal Revenue Service describes safe harbor as a 401(k) that avoids annual testing by providing mandatory employer money that vests at once. That design lets owners and highly paid staff defer the maximum without refunds after a failed test.
Table of Contents
- How much can you save in 2026?
- Why do employers choose safe harbor?
- What catch-up rules apply after 50?
- What limits and deadlines still apply?
How much can you save in 2026?
The Internal Revenue Service sets total 2026 defined-contribution additions at $72,000 per person. The same table caps countable pay at $360,000 for figuring contributions.
Elective deferrals count toward that total, so employer money fills the rest. A worker deferring $24,500 could receive up to $47,500 more in employer contributions within the cap.
Why do employers choose safe harbor?
The Internal Revenue Service says safe harbor avoids yearly ADP and ACP nondiscrimination testing. The trade is mandatory employer contributions that vest right away. The Internal Revenue Service puts the 2026 highly paid threshold at $160,000. The Internal Revenue Service explains in its Publication 560 guidance two ways to qualify.
Employers give either 3% of pay to all eligible staff or a basic match capped at 4%. The basic match is 100% of the first 3% deferred plus 50% of the next 2%. For a $100,000 salary, the nonelective is $3,000 whether the worker saves or not. The full basic match is $4,000 for a worker who defers at least 5%.
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What catch-up rules apply after 50?
The Internal Revenue Service notes in its catch-up guidance a standard age-50 catch-up of $8,000 for 2026. Workers who turn 60, 61, 62 or 63 in 2026 can use $11,250 instead, for up to $35,750 in deferrals.
Beginning in 2026, the Internal Revenue Service requires Roth treatment for catch-ups when prior-year Social Security wages from the same employer exceed $150,000. Use these checks before year-end planning:.
- check birth year: 60-63 in 2026 for $11,250; 50-plus otherwise for $8,000
- check prior-year Social Security wages from same employer against $150,000
- confirm plan allows the higher amount and Roth designation
What limits and deadlines still apply?
The Internal Revenue Service excuses a safe harbor plan from top-heavy testing only when it holds elective deferrals plus safe harbor minimums alone. Adding profit-sharing or a non-safe-harbor match restores testing and minimums.
The Internal Revenue Service notes new 401(k) and 403(b) plans after Dec. 29, 2022 must auto-enroll at 3% to 10% with 1% escalation. The Internal Revenue Service still requires matching safe harbor notices 30 to 90 days before the plan year.
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