401(k) Contribution Max Calculator

Name: 401(k) Contribution Max Calculator
Author: Laxman Kumawat

Calculate how much more you can contribute to a 401(k) for 2026. Model regular employee deferrals, age 50+ catch-up, age 60-63 enhanced catch-up, Roth catch-up flags, employer match, annual additions, voluntary after-tax room, and the payroll amount needed to max out before year-end.

Last Updated: May 31, 2026

Employee and payroll profile

Set the tax year profile, pay schedule, compensation, and prior-year wages used for Roth catch-up review.

Plan Type

Annual Compensation

Use expected 2026 compensation from this employer before employee deferrals.

Age At Year-End

Catch-up eligibility is based on age by the end of the calendar year.

Pay Frequency

Remaining Pay Periods

Use the number of payroll runs left in 2026.

Prior-Year FICA Wages From Employer

Use prior-year W-2 Box 3 wages from this employer for Roth catch-up review.

Employee deferral choices

Enter year-to-date elective deferrals plus planned pre-tax, Roth, and voluntary after-tax amounts for the rest of 2026.

YTD Employee 401(k) Deferrals

Include pre-tax and Roth elective deferrals already made this year.

Planned Remaining Pre-Tax Deferrals

Planned Remaining Roth Deferrals

Plan Allows Catch-Up?

Plan Has Roth 401(k)?

Planned Remaining After-Tax Contributions

This is voluntary after-tax 401(k), not Roth elective deferral.

Employer match and plan features

Estimate employer contributions and the annual-additions room that can matter for after-tax 401(k) or mega backdoor Roth planning.

Employer Match Rate

Example: enter 100 for dollar-for-dollar match, or 50 for fifty cents per dollar.

Employer Match Limit

Percent of eligible compensation that can be matched.

YTD Employer Contributions Already Posted

Expected Nonelective / Profit Sharing

Plan Allows After-Tax?

Needed for voluntary after-tax 401(k) contributions.

Contribution Status

Can max employee deferral

Employee Deferral Limit

$24,500.00

Remaining Employee Room

$14,500.00

Per Paycheck To Max

$1,208.33

Paycheck Percent To Max

10.4%

Mega Backdoor / After-Tax Room

$41,900.00

Limit Stack

Regular employee limit: $24,500.00
Catch-up limit: $0.00
Catch-up tier: Not age-eligible
Regular room left: $14,500.00
Catch-up room left: $0.00

Payroll Target

Pay frequency: Monthly
Pay periods left: 12
Estimated gross paycheck: $11,666.67
Per-paycheck target: $1,208.33
Payroll percent target: 10.4%

Employer And 415(c)

Compensation considered: $140,000.00
Estimated employer match: $5,600.00
Projected employer contributions: $5,600.00
Annual additions limit: $72,000.00
Room before after-tax: $41,900.00

Contribution Projection

You have $14,500 of employee deferral room left for 2026. To max it from here, target $1,208 per remaining paycheck, about 10.4% of estimated gross pay.

Contribution bucket	Allowed in model	Planning note
Remaining pre-tax elective deferrals	$14,500.00	Counts toward the shared employee elective deferral limit.
Remaining Roth elective deferrals	$0.00	Counts toward the same employee elective deferral limit as pre-tax deferrals.
Voluntary after-tax contributions	$0.00	Counts toward annual additions, not the employee elective deferral limit.
Projected employee deferrals	$24,500.00	Pre-tax plus Roth elective deferrals after the planned remaining amount.
Projected total contributions	$30,100.00	Includes modeled employee, employer, after-tax, and catch-up dollars.

Review Notes

No special warning was generated from the current entries.

Action Checklist

Set payroll near $1,208 per remaining paycheck, or about 10.4% of estimated gross pay, if the plan allows it.
Compare the remaining employee room with your next payroll election window before the last payroll cutoff.
Confirm the plan document allows catch-up, Roth deferrals, and voluntary after-tax contributions before relying on those rows.
Use the year-to-date elective deferral number from the latest paystub, not only the balance on the plan website.
Coordinate multiple employer plans yourself because the employee elective deferral limit is generally shared across plans.
Review whether voluntary after-tax contributions or in-plan Roth conversion can use the remaining $41,900 annual-additions room.

Records To Keep

Latest paystub showing year-to-date pre-tax and Roth 401(k) elective deferrals.
Plan document or summary plan description for catch-up, Roth, after-tax, and match rules.
Employer match formula and year-to-date employer contribution posting history.
Prior-year W-2 Box 3 wages from this employer for Roth catch-up threshold review.
Payroll confirmation after changing the election and final December paystub.

Important Disclaimer

This calculator provides an educational estimate for planning and comparison only. It is not tax, legal, financial, medical, lending, insurance, payroll, compliance, or institutional advice and it is not an official determination. Rules, rates, eligibility, formulas, and source data can change or depend on facts not captured here. Verify the result against official sources and qualified professional guidance before filing, paying, diagnosing, borrowing, investing, hiring, or making a compliance-sensitive decision.

Professional Review Status

This YMYL page has internal methodology review, but no external credentialed professional review is recorded yet.

Internal methodology review only

Reliance status: Credentialed finance review required before advice-like claims
Required credentials: CFP professional, CFA charterholder, CPA, licensed financial professional
Review scope: assumptions, amortization logic, risk language, offer-comparison language, affordability guidance, and disclosure placement

Current reviewer: Laxman Kumawat, Internal finance formula and engineering methodology reviewer (Electrical and power-system related certifications).

This page provides educational estimates, not individualized financial advice, lending advice, investment advice, or a product recommendation.

Finance credentialed review: professional reliance limit

This page provides educational estimates, not individualized financial advice, lending advice, investment advice, or a product recommendation. Results should be treated as a preliminary estimate, not a filing instruction, diagnosis, product recommendation, eligibility decision, or compliance sign-off. Required professional review: CFP professional, CFA charterholder, CPA, licensed financial professional. Source expectation: Review should cite official lender, regulator, tax, or standards-body sources when the calculator depends on external rules.

Checked by Laxman Kumawat

401(k) Contribution Max Calculator is checked for formula labels, source links, and result limits.

Laxman Kumawat, Finance & Engineering Calculator Owner. Updated May 31, 2026. Scope: financial calculators.

Finance credentialed review: Named internal reviewer: Laxman Kumawat, Finance & Engineering Calculator Owner. External credentialed professional review is still required before this page is treated as professional advice.

Internal finance formula and engineering methodology reviewer. Review scope: calculator formulas, input labels, rate assumptions, scenario workflows, and user-facing limitations.

Credentials on file: Electrical and power-system related certifications.

Relevant review context: Professional background across engineering, sustainability, and energy-efficiency work; CalculatorWallah finance and engineering calculator owner.

Required professional credentials: CFP professional, CFA charterholder, CPA, licensed financial professional. Scope: assumptions, amortization logic, risk language, offer-comparison language, affordability guidance, and disclosure placement.

This page provides educational estimates, not individualized financial advice, lending advice, investment advice, or a product recommendation.

Sources & methodology · Review standards

How To Use The 401(k) Contribution Max Calculator

Step 1: Enter the plan and payroll profile
Choose standard, safe harbor, or SIMPLE 401(k), then enter age, annual compensation, pay frequency, and remaining pay periods.
Step 2: Add year-to-date employee deferrals
Use the latest paystub total for pre-tax plus Roth elective deferrals already made in 2026.
Step 3: Enter planned remaining contributions
Separate pre-tax elective deferrals, Roth elective deferrals, and voluntary after-tax 401(k) contributions because they use different limits.
Step 4: Model employer match and plan features
Add the match formula, employer contributions already posted, expected nonelective money, and whether the plan allows catch-up, Roth, and after-tax contributions.
Step 5: Review the payroll target and warnings
Use the remaining room, per-paycheck target, Roth catch-up warning, annual-additions room, and record checklist before changing payroll.

How This Calculator Works

The calculator starts with the 2026 IRS employee elective deferral limit. For most 401(k) plans, pre-tax and Roth elective deferrals share a regular limit of $24,500. If the participant is age 50 or older and the plan permits catch-up contributions, the calculator adds the applicable catch-up limit. Ages 60 through 63 receive the enhanced $11,250 catch-up amount in most 401(k) plans for 2026.

Next, it subtracts year-to-date elective deferrals from the employee limit and translates the remaining room into a per-paycheck target. The payroll percentage is based on the selected pay frequency and annual compensation, so it is useful for making a practical payroll election instead of only seeing an annual cap.

The employer and after-tax section models a separate limit. Regular employee deferrals, employer match, nonelective contributions, forfeitures, and voluntary after-tax 401(k) contributions generally share the annual-additions limit. Catch-up contributions are tracked outside that annual-additions cap.

401(k) Contribution Max Guide: 2026 Limits, Catch-Up Rules, Employer Match, After-Tax Room, And Payroll Timing

2026 401(k) limits used by this calculator

A 401(k) max contribution calculation has two layers. The first is the employee elective deferral limit, which controls pre-tax and Roth 401(k) salary deferrals. The second is the annual-additions limit, which controls the combined regular employee deferrals, employer contributions, forfeitures, and voluntary after-tax contributions for one employer plan. Mixing those two limits is one of the most common 401(k) planning mistakes.

2026 limit	Amount	How the calculator uses it
Employee elective deferral	$24,500	Pre-tax and Roth 401(k) deferrals combined
Age 50+ catch-up	$8,000	If the plan allows catch-up contributions
Age 60-63 enhanced catch-up	$11,250	Applies to ages 60, 61, 62, and 63 at year-end
Annual additions limit	$72,000	Regular deferrals, employer money, forfeitures, and after-tax contributions before catch-up
Annual compensation limit	$360,000	Compensation generally usable for plan formulas
Roth catch-up wage threshold	$150,000	Prior-year FICA wages from the plan sponsor

SIMPLE 401(k) limits are smaller

A SIMPLE 401(k) uses different employee deferral and catch-up limits. Select SIMPLE 401(k) only if the employer plan is specifically a SIMPLE 401(k), not merely a small employer safe harbor 401(k). The calculator keeps after-tax and annual-additions planning conservative for SIMPLE plans.

SIMPLE 401(k) 2026 item	Amount
SIMPLE 401(k) employee deferral	$17,000
SIMPLE 401(k) age 50+ catch-up	$4,000
SIMPLE 401(k) age 60-63 catch-up	$5,250

Pre-tax, Roth, employer match, and after-tax dollars do not all use the same bucket

Traditional pre-tax deferrals and Roth 401(k) deferrals compete for the same employee limit. Employer match does not use that employee limit, but it does use annual-additions room. Voluntary after-tax 401(k) contributions also use annual-additions room and are different from Roth 401(k) elective deferrals.

Contribution type	Primary limit bucket	Planning note
Pre-tax 401(k)	Employee elective deferral limit	Reduces current taxable wages, but later qualified distributions are generally taxable.
Roth 401(k)	Employee elective deferral limit	No current wage exclusion, but qualified Roth distributions can be tax-free.
Employer match	Annual additions limit	Does not reduce employee deferral room; match formula is controlled by the plan.
Voluntary after-tax 401(k)	Annual additions limit	Can support mega backdoor Roth workflows only if the plan allows after-tax contributions and conversion or distribution mechanics.
Catch-up contribution	Catch-up dollar limit	Added after the regular elective deferral limit and excluded from the $72,000 annual-additions cap.

Catch-up rules changed the high-earner payroll workflow

Beginning in 2026, participants whose prior-year FICA wages from the plan sponsor exceed $150,000 generally must make catch-up contributions as designated Roth contributions if the plan offers catch-up and Roth features. That does not change the total catch-up dollar limit, but it can change which payroll bucket must receive the final dollars after the regular employee limit is filled.

Employer match can stop before your salary does

The 2026 compensation cap means plan formulas generally cannot count more than $360,000 of compensation. For a high earner, that cap can limit match calculations even if cash salary is higher. Plans also define match by pay period, annual true-up, eligibility date, and vesting, so the calculator should be used as a planning estimate rather than a substitute for the plan document.

Maxing the 401(k) is a payroll timing problem

A saver can know the annual limit and still miss the maximum if the payroll election changes too late. The per-paycheck result shows how much must be deferred across the remaining pay periods. If the required percentage is very high, check payroll limits, plan limits, and whether the employer match requires contributions in each pay period.

Connect this with long-term retirement and tax planning

This tool answers the contribution-room question. To project how those contributions may grow over time, use the 401(k) / Retirement Calculator. If the next decision is whether Roth conversion income fits in a tax bracket, use the Roth Conversion Tax Calculator. For IRA contribution planning alongside workplace plans, compare the Roth IRA Eligibility Calculator and Traditional IRA Deduction Calculator.

Keep the research moving with 401(k) / Retirement Calculator, Roth Conversion Tax Calculator, Roth IRA Eligibility Calculator, and Federal Income Tax Calculator.

Frequently Asked Questions

For most 401(k), 403(b), governmental 457, and TSP plans, the 2026 employee elective deferral limit is $24,500 before catch-up contributions. Traditional pre-tax and Roth 401(k) elective deferrals share this same employee limit.

If the plan allows catch-up contributions, most participants age 50 or older can add an $8,000 catch-up contribution in 2026, for a total employee elective deferral limit of $32,500.

Participants who turn age 60, 61, 62, or 63 by the end of 2026 can use a higher catch-up limit of $11,250 in most 401(k) plans if the plan permits catch-up contributions.

No. Employer matching and nonelective contributions do not use the employee elective deferral limit. They do count toward the separate annual additions limit, together with regular employee deferrals and voluntary after-tax contributions.

For most defined contribution plans, annual additions are limited to the lesser of 100% of compensation or $72,000 in 2026, before adding catch-up contributions. The calculator uses this limit for standard and safe harbor 401(k) plans.

Yes. Roth 401(k) elective deferrals and pre-tax elective deferrals share the same employee deferral limit. The calculator also flags the 2026 high-wage Roth catch-up rule when prior-year FICA wages from the employer exceed $150,000.

Yes. If the plan allows voluntary after-tax contributions, the calculator estimates annual-additions room after regular employee deferrals and employer contributions. It does not guarantee in-plan Roth conversion availability because that depends on the plan document.

Yes. IRS limits are ceilings. A plan can impose lower payroll limits, restrict catch-up or after-tax contributions, apply nondiscrimination testing, or require corrective refunds for highly compensated employees.