Translate plan language into two match rungs

A plan saying “100% of the first 3% of compensation and 50% of the next 2%” has two rungs. Tier 1 matches each employee dollar through a 3% contribution rate. Tier 2 begins above 3% and ends when total employee contributions reach 5%. An employee contributing 5% captures a maximum employer amount equal to 4% of eligible compensation: 3% from the first rung and 1% from the second.

The calculator allows both employer percentages and both employee-rate ceilings to change. For a simple “50% up to 6%” formula, set Tier 1 to 50% through 6% and make Tier 2 end at the same 6% ceiling. For a dollar-for-dollar match through 4%, set Tier 1 to 100% through 4% and collapse Tier 2 at 4%.

Plan wording controls. Some formulas use compensation each payroll period; others calculate annually. Discretionary match, profit sharing, nonelective contributions, student-loan-payment matches, and safe-harbor formulas can require different inputs. The model assumes the entered employee deferral rate applies evenly to eligible compensation throughout the year.

Read the stairs before changing payroll

2026 federal limits used by the calculator

For 2026, the basic employee elective-deferral limit for most 401(k) plans is $24,500. The general catch-up for a participant age 50 or older is $8,000. A participant who attains age 60, 61, 62, or 63 during 2026 can have a higher $11,250 catch-up limit instead. Plan eligibility, payroll operation, and the mandatory Roth catch-up rules for certain higher-wage participants must still be checked.

The annual compensation limit generally used for contribution calculations is $360,000 for 2026. The calculator limits compensation used by its formula to that amount, even if entered pay is higher. A plan can define eligible compensation more narrowly—for example, excluding bonuses or pay before eligibility—so the statutory ceiling does not prove every dollar is matchable.

The 2026 defined-contribution annual-additions limit is $72,000, generally covering employee pretax/Roth deferrals, after-tax contributions, employer match, and other employer contributions, while catch-up contributions receive special treatment. This calculator compares the modeled employee contribution plus match with $72,000 but does not reconstruct every contribution source or affiliated-employer plan.

Why level contributions matter when there is no true-up

Many payroll systems calculate match each pay period. If an employee contributes aggressively early, reaches the annual deferral limit, and contributes nothing in later paychecks, those later checks can generate no match. An annual true-up can restore some or all of the shortfall, but only if the plan document provides it and the participant meets its conditions.

This calculator explicitly does not assume a true-up because “401(k) true up contribution calculator” is a separate timing problem. Its per-paycheck amounts divide annual figures evenly. A participant should confirm whether the plan matches per payroll, uses year-to-date corrections, excludes bonuses, requires employment on the last day of the year, or deposits a true-up after year-end.

To reduce missed-match risk under a per-pay-period plan without true-up, select a contribution rate that remains active through the last eligible paycheck. Bonus deferrals and changing pay can disrupt a simple percentage. Recalculate after a raise, midyear hire, leave, or contribution election change.

Vesting changes ownership, not the match formula

Employee salary deferrals are always fully vested. Employer matching contributions may vest immediately or under a cliff or graded schedule, subject to plan and legal requirements. The calculator applies the entered vesting percentage only after determining the employer contribution, so it shows both credited match and the portion currently vested.

Leaving employment before a vesting milestone can forfeit unvested match. Returning to the employer, break-in-service rules, plan termination, normal retirement age, death, disability, or other plan provisions can affect vesting. A current account website may display a balance that includes unvested dollars; read the vested-balance field separately.

A safe-harbor 401(k) match is commonly immediately vested, but the formula and notices must confirm the plan type. Do not enter 100% merely because the employer calls the contribution a match.

Example: 100% through 3%, then 50% through 5%

Assume eligible compensation is $90,000 and the employee contributes 4%. Employee deferrals are $3,600 for the year, or about $138 across 26 equal paychecks. The first $2,700 of employee contributions—3% of pay—receives a $2,700 match. The next $900—between 3% and 4%—receives a 50% match of $450. Total employer match is $3,150.

The maximum entered formula would match $3,600 if the employee contributed 5%: $2,700 on the first rung plus $900 on the second. Contributing one additional percentage point, or $900 annually, therefore unlocks $450 more match. The contribution rate captures 87.5% of the available employer amount.

At 100% vesting, all $3,150 is currently owned. At 40% vesting, the account can receive the same annual match, but only $1,260 is shown as presently vested. Investment gains and losses, deposit timing, fees, and forfeiture restoration are outside the arithmetic.

Use the match result in a broader savings decision

• Confirm eligible compensation. Determine whether salary, overtime, commission, and bonus pay enter the formula and when eligibility begins.
• Check payroll frequency. Find out whether the plan matches every paycheck, annually, or with a true-up. Spread contributions when necessary.
• Respect all contribution sources. Deferrals to another employer’s 401(k) or 403(b) share the individual elective-deferral limit in many cases.
• Read vesting and last-day conditions. Credited match can be forfeitable, and some discretionary contributions require employment on a specified date.

Capturing the full match is often attractive because it adds employer dollars immediately, but it does not replace emergency savings, debt management, insurance, or a diversified investment choice. The “full-match rate” is a plan threshold, not a universal recommendation to stop saving there.

Common formula-entry mistakes

“50% up to 6%” does not mean the employer contributes 6% of salary. It generally means the employee contributes 6% and the employer contributes half of that, or 3% of eligible compensation. Likewise, “100% on 3%, plus 50% on the next 2%” is not a 150% match on all contributions.

Do not add the match to the employee’s $24,500 elective-deferral limit. Employer matching contributions do not reduce that employee deferral ceiling, though both generally count toward the broader annual-additions limit. Catch-up eligibility can expand employee room but does not require an employer to match catch-up dollars.

Finally, do not apply the formula to total household income. Each employer plan uses its own eligible compensation and document. A spouse’s compensation does not increase the employee’s match ceiling.

Questions employees ask about matching

References

2026 limits: IRS Notice 2025-67 and IRS COLA Limits by Plan Type. Matching formula guidance: IRS Matching Contributions Help You Save More for Retirement.