Calculate per-paycheck 401(k) deferrals to hit 2026 limits ($24,500 base, $11,250 Super Catch-Up for ages 60-63) and optimize employer match.
Maximize your 2026 401(k) retirement contributions with our per-paycheck deferral optimizer. For 2026, the IRS increased the employee deferral limit to $24,500. Workers aged 50–59 and 64+ can make an additional $8,000 catch-up contribution ($32,500 total), while workers aged 60–63 qualify for the SECURE 2.0 'Super Catch-Up' of $11,250 ($35,750 total). Calculate your exact paycheck percentage to max out your 401(k) without missing employer match dollars.
The IRS raised base 401(k), 403(b), and 457 employee deferral limits to $24,500 for 2026 (up from $23,500 in 2025). The overall Section 415(c) total limit for combined employee plus employer contributions rose to $72,000.
Under SECURE 2.0 provisions effective for 2026, employees who attain age 60, 61, 62, or 63 during the calendar year qualify for a higher catch-up contribution of $11,250 (or 150% of the standard catch-up limit). Combined with the $24,500 base, 60–63 year-olds can defer up to $35,750 in 2026.
Employees turning age 50 to 59 or 64+ in 2026 qualify for the standard $8,000 catch-up contribution, raising their total employee deferral limit to $32,500. Turning 50 at any point during 2026 allows you to claim the full $8,000 catch-up for the entire calendar year.
To capture your full employer match (e.g. 50% up to 6% of salary), avoid hitting the $24,500 cap too early in the year unless your plan offers a 'true-up' provision. Spreading contributions evenly across all remaining paychecks ensures you receive employer matching dollars on every single paycheck. Mid-year job changers need one extra step: the deferral limit is per person, not per employer, so contributions at the old job count against the same ceiling. Tell the new plan administrator your year-to-date figure from the final old paystub, because payroll systems only police the limit for their own plan, and the excess-deferral cleanup after April 15 is entirely your problem, not theirs.
SECURE 2.0 built a one-time bulge into the system: at 60 through 63 your catch-up jumps from $8,000 to $11,250, then falls BACK to $8,000 at 64. It is the only place in the retirement code where getting older reduces a limit, and it exists precisely in the years when mortgages are dying and college bills are done, peak savings capacity for most careers.
Four years of the extra $3,250, invested at a 7% return until 67, is worth roughly $17,000 of additional balance. Not life-changing alone, but it compounds with the larger pattern: people who max the 60-63 window usually also fix their match capture and their Roth mix in the same review, and together those changes can move six figures over a retirement.
Most plans match per paycheck: 50% of your deferral up to 6% of that check's pay. Hit your annual limit in September and your October-December deferrals are zero, so the match on those checks is zero too, on Elaine's salary that is $900 of free money forfeited for finishing early.
Some plans repair this with a year-end 'true-up' deposit; many do not, and the summary plan description is the only place that says which kind you have. No true-up means the optimal path is level deferrals sized to land on the limit with the final December check, which is exactly the per-paycheck figure this calculator outputs.
The match itself does not eat your employee limit: employer dollars live under the separate combined cap ($72,000 in 2026). You can never 'crowd out' the match by maxing your own deferral; you can only lose it by pausing.
From 2026, catch-up contributions must go in as Roth if your PRIOR-year W-2 from that employer topped $150,000 (Notice 2025-67's indexed threshold). The test is backward-looking and employer-specific: a new hire has no prior W-2 with the new employer, so the mandate does not bite in year one, a quirk that genuinely matters for job-changers deciding when to move.
Roth catch-up is not a punishment, you trade today's deduction for tax-free withdrawals, but it does raise this year's tax bill versus the pre-tax habit you may have had for a decade. High earners in the 32%+ brackets should re-run their withholding after the switch, and anyone whose plan has not enabled a Roth source needs to ask now: a plan with no Roth option cannot legally take your catch-up at all once the mandate applies to you.
The $35,750 ceiling is the EMPLOYEE limit under 402(g); the combined employer-plus-employee cap is $72,000, and after-tax contributions above your deferral limit (the mega-backdoor path) only exist if your plan documents allow them, most do not. Check before building a plan around the gap.
Two smaller edges: the limit is per PERSON across all plans, so two jobs' 401(k)s share one $24,500, exceeding it creates taxable excess deferrals that are miserable to unwind after 15 April. And the IRA limit ($7,500, plus $1,100 catch-up) is a separate bucket entirely, maxing the 401(k) does not touch it, so the true 2026 ceiling for a 61-year-old with both accounts is $44,350 of tax-advantaged space.
The 2026 employee deferral limit is $24,500, plus an $8,000 catch-up from age 50, or the SECURE 2.0 'super catch-up' of $11,250 for the four birthdays from 60 through 63. The calculator finds your tier, subtracts what you have already put in this year, and splits the remainder across your remaining paychecks.
It also runs the two checks people miss: whether your per-paycheck rate captures the full employer match all year, and whether last year's W-2 crossed the $150,000 line that forces catch-up dollars into Roth under IRS Notice 2025-67.
Elaine is 61, earns $120,000, paid bi-weekly, with 12 paychecks left in 2026 and nothing contributed yet after a job change.
Her tier: $24,500 + $11,250 super catch-up = $35,750, the highest employee limit in the system.
Per remaining paycheck: $35,750 / 12 = $2,979, about 64% of each gross check, aggressive but legal, and exactly the situation the per-paycheck view exists for.
Her employer matches 50% up to 6% of salary: worth $3,600 for the year, but only if every paycheck carries at least a 6% deferral, front-loading to hit $35,750 by October would forfeit match on the November and December checks unless the plan has a true-up.
Her 2025 W-2 was $120,000, under the $150,000 line, so her catch-up dollars may stay pre-tax if she prefers the deduction today.
Review the glossary of terms used in the calculation model below. Click on highlighted links to read more in-depth definitions in our financial glossary:
| Parameter | Definition & Context |
|---|---|
| Gross Annual Salary | Sets the match dollars and converts your target into a per-paycheck percentage. |
| Your Age in 2026 | Decides the tier: 49 and under, 50-59/64+, or the 60-63 super catch-up window. |
| Remaining Paychecks | How many pay events are left this year; fewer checks means a steeper per-check target. |
| Prior Year W-2 Income | The Notice 2025-67 test: above $150,000, all catch-up contributions must be Roth. |
The rules and figures on this page are researched from official primary sources:
