401(k) Per Paycheck Calculator
Turn a 2026 deferral target into dollars per paycheck. Built for the way US employers actually run payroll: biweekly, semi-monthly, weekly, or monthly.
Inputs
Uses 2026 employee elective deferral ceilings ($24,500 base; $32,500 with standard catch-up; $35,750 with ages 60–63 super catch-up) consistent with our IRS limits guide. Does not model Roth vs Traditional take-home differences.
How to Use the Per Paycheck Calculator
Start from either a dollar max-out goal or a percent of salary, then match your employer's actual pay schedule.
- Pick pay periods. Biweekly is not semi-monthly—choosing the wrong count is the most common paycheck math mistake.
- Compare to the IRS deferral cap. We cap the annual input at your 2026 elective deferral band based on age.
- Validate on a pay stub. Payroll systems can prorate bonuses, catch-up flags, and plan-entry dates differently.
How to Read the Results
Elective deferral cap
Employer match does not count toward your $24,500 base employee limit—it follows separate plan formulas.
What to Do Next
How We Reviewed This Tool
Tool-Level Methodology
- Built the paycheck splitter around the most common US payroll cadences: 26, 24, 52, and 12 pay periods per year.
- Capped modeled annual deferrals using the same 2026 elective deferral bands used on the catch-up and limits pages.
- Offered both percent-of-salary and annual-dollar entry paths because payroll systems accept either mental model.
Assumption Review
- The calculator assumes equal deferrals each pay period and does not prorate mid-year hire dates, bonus checks, or catch-up toggles unless the user adjusts inputs manually.
- Employer match timing and true-up rules are not modeled here; users should still validate against an actual pay stub.
- Roth vs Traditional tax effects on take-home pay are only indirectly referenced through links to the paycheck-impact calculator.
Update Log
- Added the per-paycheck page to capture biweekly and semi-monthly long-tail intent next to the contribution calculator cluster.
- Synchronized deferral ceilings with the standalone catch-up tool for 2026.
- Linked outward to employer match guidance where paycheck maxing interacts with match formulas.
Why Per-Paycheck Math Matters
Maxing out late in the year can miss match formulas that cap per pay period. If you are optimizing for match, pair this tool with the employer match calculator. Keyboard typo? Our 401l calculator page routes the same intent.
Frequently Asked Questions
How do I calculate my 401(k) contribution per paycheck?
Divide your annual elective deferral goal by the number of pay periods in the year. For example, $24,500 divided by 26 biweekly checks is about $942 per paycheck before any employer match.
Is biweekly the same as semi-monthly?
No. Biweekly is every two weeks (usually 26 pay dates per year). Semi-monthly is twice per month (24 pay dates per year). The per-paycheck amount changes with the schedule.
Does this tool include employer match?
This calculator focuses on your elective deferral per paycheck. Employer match follows your plan's formula and is separate from your deferral election.
How we document this page (E-E-A-T)
Experience. This page is written for U.S. workers navigating real payroll and plan rules, not abstract theory. Where we simplify, we say so explicitly so you can escalate to your plan’s summary plan description (SPD) or recordkeeper.
Expertise. 401lcalculator.com is an independent retirement planning tool site founded by David Jones (calculator methodology specialist). Limits and formulas are checked against IRS retirement-plan notices and SECURE 2.0 framing. Numeric caps align with our 2026 limits reference page, which cites Notice 2025-67.
Authoritativeness. For any conflict between this calculator and the IRS or your plan, the IRS and your plan win. Primary sources:
- IRS — Retirement Topics, 401(k) and profit-sharing plan contribution limits
- IRS Notice 2025-67 (PDF) — official 2026 dollar announcements.
Trustworthiness. This tool is not individualized tax, legal, or wealth-management advice. Plan documents, payroll settings, and your full tax return facts can change outcomes. We publish calculator methodology in the sections above so you can compare our framing with your plan administrator or a licensed professional.
For one-on-one guidance, consult a CFP® professional. All math runs locally in your browser; see our privacy policy.
Corrections. If you believe a limit or IRS reference is out of date after publication, please contact us with a primary source link so we can verify and update.
- Reviewed by David Jones
- Limits Updated for 2026 IRS contribution caps
- Formulas Verified quarterly
Review & Methodology
- Reviewed by David Jones (calculator methodology).
- Updated for 2026 IRS contribution limits (refreshed after each annual IRS notice).
- Core calculator formulas are re-tested quarterly; limit-driven logic is checked when IRS guidance changes.
- Educational projections only — not investment, tax, or wealth-management advice. Calculations run locally in your browser.