401k Max Contribution Calculator

• How much should I contribute to my 401k?

  At an absolute minimum, contribute enough to capture the full employer match — that is free money and typically the highest guaranteed return available. Beyond the match, a widely used target is 15% of your gross pay including that match, and toward the annual IRS limit of $24,500 for 2026 if you can afford it. For example, on a $70,000 salary a 15% target is $10,500 a year, of which an employer match might supply $2,100. Raising your rate one percentage point each year, or with every pay rise, closes the gap almost painlessly. One caveat: your own deferrals are capped at $24,500 (plus a $8,000 catch-up from age 50), and a traditional contribution costs less in take-home than its face value because it comes out before income tax.

• How much should I put in my 401k?

  Start with at least the match cap so you capture every employer dollar, then build toward 15% of gross pay including that match. If you can max out, the 2026 elective-deferral limit is $24,500, rising to $32,500 with the age-50 catch-up and $35,750 at ages 60–63. On a $90,000 salary, 15% is $13,500 a year — comfortably under the limit — while maxing out would be about 27% of pay. Increase your rate gradually rather than all at once so the change to your take-home stays manageable. One caveat: only your own contributions count toward these limits, not the employer match, and if you are hitting the ceiling, spreading contributions evenly across the year avoids forfeiting late-year matches unless your plan offers a true-up.

• How to calculate 401k contribution to max out?

  Subtract what you have already contributed this year from the $24,500 limit, then divide the remainder by the number of paychecks you have left. That gives the per-paycheck dollar amount; divide it by your gross pay per paycheck to get the percentage to set in payroll. For example, if you earn $90,000, have contributed $5,000, and have 20 biweekly paychecks left, the remaining $19,500 works out to $975 per paycheck — about 28% of pay. Setting a percentage rather than a flat dollar keeps you on track even as your pay changes. One caveat: from age 50 you can add a $8,000 catch-up ($11,250 at ages 60–63), and front-loading to finish early can forfeit later-month employer matches unless your plan offers a true-up.

• How to calculate 401k contribution percentage?

  Divide your target per-paycheck contribution by your gross pay for that paycheck, then multiply by 100. For example, $975 out of $3,462 gross is about 28%; $500 out of $2,700 is about 18.5%. Working from an annual goal instead, divide the goal by your pay periods to get the per-paycheck dollar figure first, then convert. Using a percentage rather than a fixed dollar amount means your contribution scales automatically with raises, bonuses, and pay changes, keeping you on pace without manual adjustments. One caveat: payroll systems usually round to whole or half percentages, so the exact figure may not be selectable — round up slightly rather than down to avoid falling short, and confirm the annual total stays within the $24,500 limit for 2026.

• How much to put in 401k to reach the limit?

  To reach the 2026 employee limit you need total deferrals of $24,500 (before any catch-up), or $32,500 from age 50 and $35,750 at ages 60–63. This tool divides the room you have left across your remaining paychecks so you land on the limit exactly by year-end — no more, no less. For example, with $10,000 already contributed and 18 paychecks remaining, the leftover $14,500 is about $806 per paycheck. Overshooting creates an excess deferral that can be taxed twice if not corrected, while undershooting wastes tax-advantaged room. One caveat: the limit is per person across every 401k you hold, so contributions to a second employer's plan in the same year count toward the same $24,500 ceiling — and only your own deferrals count here, since the employer match sits separately under the higher $72,000 combined limit.

• IRS-accurate formulas

  Uses the current IRS contribution limits, penalty rules and RMD tables — updated for 2026.

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