401(k) Front-Loading, Match & True-Up Paycheck Optimizer

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Walk-through

How to Use This Calculator

4 steps

1

Enter the year-to-date position

Your total target for the year, including year-to-date employee deferrals. For 2026, the test uses 2025 FICA wages from the plan sponsor strictly above USD 150,000. It changes the tax character of catch-up contributions, not the age-based statutory contribution ceiling. Confirm special employer aggregation, non-FICA or other plan-specific rules with the administrator.

2

Transcribe the actual plan terms

Use your plan document or payroll administrator’s answers. Missing compensation, vesting or election availability stays unknown; a modeled schedule is not an employer guarantee. Checks before this date can still accept employee deferrals but earn no modeled match. Leave blank to use each row’s match-eligibility choice. Enter only eligible year-to-date compensation and deferrals. A payment before the eligibility date is excluded. Unknown employment uses the conservative schedule and a separate conditional scenario. The payment can occur in the following year while retaining the contribution-year rules. Enter the percentage confirmed under the vesting schedule, from 0 to 100. Blank means unknown. Earned match and vested amounts are separate; employee deferrals are not reduced. Select the actual plan convention. Per-payment modes calculate paid cents under that convention; the proposed allocation is feasible, but this solver does not certify its maximum match under discrete rounding.

3

Add every remaining paycheck

Use the downloaded CSV template’s canonical column names and numeric values. Edit the preview before applying; no rows replace your current payroll until you confirm.

4

Compare schedules and warnings

The numeric target remains authoritative. Changing it re-optimizes the same payroll rows; the comparison includes optimized, even and front-loaded schedules. Review the selected fields and all included scenario data before copying the link. Plan rules remain available without personal or payroll values.

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Reference

Formula & Methodology

4 formulas

Tiered employer match

M(C,D) = Σ r_j × max(0, min(D, C×u_j) − C×u_(j−1))

C is match-eligible compensation, D is employee deferral, u is each cumulative compensation threshold and r is that tier’s marginal match rate.

Remaining employee target

Remaining target = max(0, min(annual target, employee capacity) − YTD employee deferrals)

Your total target for the year, including year-to-date employee deferrals. After-tax employee contributions and other employer contributions share annual-additions room. Qualified elective catch-up contributions are tracked separately.

Positive annual true-up

True-up = max(0, annual-formula match − match already paid through the true-up date)

A payment before the eligibility date is excluded. Unknown employment uses the conservative schedule and a separate conditional scenario. The payment can occur in the following year while retaining the contribution-year rules.

Modeled annual-additions room

Annual additions = employee deferrals − qualified catch-up + after-tax employee + employer contributions + match; cap = min(federal dollar cap, annual-additions compensation)

This is the plan’s separate annual-additions compensation definition, not automatically match-eligible compensation. Leave blank if unconfirmed. After-tax employee contributions and other employer contributions share annual-additions room. Qualified elective catch-up contributions are tracked separately.

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YMYL

Trust, Methodology & Sources

Written by Calculover · Updated 2026-09-30 · 5 sources

Editorial accountability

Author: Calculover - Calculator development

Owner: Calculover - Site content ownership

Last reviewed: 2026-09-30

Last verified: 2026-11-05

Methodology

Dated paycheck ledger with cumulative tiered match formulas, chronological compensation limits, positive annual true-up logic, modeled section 415(c) match room and exact marginal-segment allocation for supported concave formulas. Small instances are checked by independent cent-level enumeration.

Assumption: All employer match, bonus and true-up terms are transcribed by the user from current plan materials.

Assumption: Year-to-date employer match is treated as paid before the entered future checks.

Assumption: This is the plan’s separate annual-additions compensation definition, not automatically match-eligible compensation. Leave blank if unconfirmed. After-tax employee contributions and other employer contributions share annual-additions room. Qualified elective catch-up contributions are tracked separately.

Assumption: Select the actual plan convention. Per-payment modes calculate paid cents under that convention; the proposed allocation is feasible, but this solver does not certify its maximum match under discrete rounding.

Limitations & guidance

Federal rule years are limited to 2025 and 2026.

Select the actual plan convention. Per-payment modes calculate paid cents under that convention; the proposed allocation is feasible, but this solver does not certify its maximum match under discrete rounding.

Use your plan document or payroll administrator’s answers. Missing compensation, vesting or election availability stays unknown; a modeled schedule is not an employer guarantee. Enter the percentage confirmed under the vesting schedule, from 0 to 100. Blank means unknown. Earned match and vested amounts are separate; employee deferrals are not reduced.

A payment before the eligibility date is excluded. Unknown employment uses the conservative schedule and a separate conditional scenario. The payment can occur in the following year while retaining the contribution-year rules.

Professional guidance: Educational estimate based on entered plan and payroll facts; not financial, investment, legal, tax, payroll or benefits advice. Verify the written plan and payroll implementation with the plan administrator and consult a qualified professional for your circumstances.

Primary sources

Notice 2025-67 — 2026 Amounts Relating to Retirement Plans and IRAs

TD 10033 — Catch-Up Contributions Final Regulations

Notice 2024-80 — 2025 Amounts Relating to Retirement Plans and IRAs

Notice 2023-62 — SECURE 2.0 Catch-Up Contribution Transition Relief

Understanding Your Responsibilities

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Glossary

Key Terms Explained

8 terms

Front-loading Contributing a larger share earlier in the year instead of spreading employee deferrals across remaining checks.

Per-paycheck match Employer match calculated separately on each paycheck under the entered plan formula.

True-up A plan-specific later contribution that may reconcile annual match after per-paycheck calculations. It is not universal and may require employment on a specified date.

Match-eligible compensation Compensation the entered plan formula counts for employer match, after any applicable compensation definition or cap.

Catch-up contribution Additional employee deferral room available under supported federal rules when age and plan terms allow it.

Annual-additions limit This is the plan’s separate annual-additions compensation definition, not automatically match-eligible compensation. Leave blank if unconfirmed. After-tax employee contributions and other employer contributions share annual-additions room. Qualified elective catch-up contributions are tracked separately.

Concave tier formula A cumulative match formula whose marginal match rate does not increase in later tiers. This condition permits the exact marginal-allocation optimizer.

Binding constraint The employee limit, paycheck capacity, compensation ceiling, match cap or true-up condition that actively restricts the modeled result.

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Scenarios

Real-World Examples

3 worked examples

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Without a true-up

Protect the match by spreading contributions across four remaining checks.

Result

$240 match

Remaining checks 4 Eligible pay per check $2,000 Match formula 100% through 3% Employee target $240 True-up No

Deferring $60 on each check reaches the $240 target and earns $60 on each check. Deferring all $240 on the first check earns only $60 under the synthetic per-paycheck formula.

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With a true-up

Reconcile the annual match after front-loading the employee contribution.

Result

$180 true-up

Annual eligible pay $8,000 Annual employee deferral $240 Match already paid $60 True-up eligible Yes

The annual 3% threshold is $240. Subtracting $60 already paid leaves a positive $180 true-up in this fixture.

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Two-tier match

Apply a different marginal match rate to each contribution tier.

Result

$80 match

Eligible pay $2,000 Employee deferral $100 Match formula 100% through 3%; 50% from 3% through 5%

The first $60 earns $60 and the next $40 earns $20. These are synthetic terms used to validate the formula engine.

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Reference

Cite This Calculator

APA & MLA

Use either format to cite this calculator in a paper, report, or resource list.

APA

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Deep Dive

Why contribution timing can change employer match

4 chapters · 4 min read

An annual employee-deferral target does not by itself determine employer match. When a plan matches each paycheck and does not later reconcile the year, reaching the employee target too early can leave later checks with no deferral and no match. This calculator turns the remaining payroll calendar and the plan terms you enter into a transparent schedule.

Separate federal limits from plan mechanics

Federal dollar limits define supported employee, compensation and annual-additions ceilings. They do not create an employer match, determine whether a bonus is eligible or promise a true-up. Those features come from the actual written plan and payroll administration, so the tool requires user entry instead of embedding a generic assumption.

Use the payroll ledger, not only an annual percentage

Each future check has its own date, pay amount, eligible compensation and maximum deferral capacity. The engine applies the compensation ceiling chronologically, calculates per-check match, and then evaluates an annual true-up only when the entered terms make it available.

Read exactness within the supported model

Select the actual plan convention. Per-payment modes calculate paid cents under that convention; the proposed allocation is feasible, but this solver does not certify its maximum match under discrete rounding. Enter the percentage confirmed under the vesting schedule, from 0 to 100. Blank means unknown. Earned match and vested amounts are separate; employee deferrals are not reduced. Use your plan document or payroll administrator’s answers. Missing compensation, vesting or election availability stays unknown; a modeled schedule is not an employer guarantee.

Treat sharing and saving as private choices

The calculator runs locally and saving on this device is optional. A copied link includes the rule year and plan terms by default. You can preview and approve optional personal or payroll fields before including them. Anyone with the link can read its encoded contents.

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Questions

Frequently Asked Questions

8 questions

Does every 401(k) plan provide a true-up?+

No. A true-up is plan-specific. Enter it only when your plan materials or administrator confirm the formula, covered compensation, timing and any employment condition. A payment before the eligibility date is excluded. Unknown employment uses the conservative schedule and a separate conditional scenario. The payment can occur in the following year while retaining the contribution-year rules.

Can employer match reduce my employee contribution limit?+

Employer match does not reduce the statutory employee elective-deferral ceiling. It shares annual-additions room with ordinary employee deferrals and after-tax contributions; qualified catch-up is separate. Enter the annual-additions compensation basis and other contributions.

Why can front-loading lose match?+

A per-paycheck formula can cap match on each check. Once employee deferrals stop, later checks may earn no match unless an eligible annual true-up restores it.

How are bonuses handled?+

Each bonus row has separate employee-contribution and employer-match eligibility switches. The calculator never assumes all bonus pay is eligible.

What years are supported?+

This calculator includes versioned federal limits for 2025 and 2026 only. Other years return an unsupported validation state rather than reusing a nearby year.

Does the 2026 Roth catch-up rule change the match calculation?+

For 2026, the test uses 2025 FICA wages from the plan sponsor strictly above USD 150,000. It changes the tax character of catch-up contributions, not the age-based statutory contribution ceiling. Confirm special employer aggregation, non-FICA or other plan-specific rules with the administrator. Use your plan document or payroll administrator’s answers. Missing compensation, vesting or election availability stays unknown; a modeled schedule is not an employer guarantee.

Is the recommended schedule guaranteed to work in payroll?+

No. It is an educational model based on the entered data. Payroll election deadlines, percentage rounding, compensation definitions and plan administration can differ. Select the actual plan convention. Per-payment modes calculate paid cents under that convention; the proposed allocation is feasible, but this solver does not certify its maximum match under discrete rounding.

Are my inputs saved or shared automatically?+

No. Local saving is optional and you can clear your saved plan. A copied link includes only plan terms by default. You choose and approve any personal or payroll fields before including them. Review the selected fields and all included scenario data before copying the link. Plan rules remain available without personal or payroll values.

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Calculator topic401(k) Front-Loading, Match & True-Up Paycheck Optimizer

How to Use This Calculator

Enter the year-to-date position

Transcribe the actual plan terms

Add every remaining paycheck

Compare schedules and warnings

Formula & Methodology

Trust, Methodology & Sources

Key Terms Explained

Real-World Examples

Cite This Calculator

Why contribution timing can change employer match

Separate federal limits from plan mechanics

Use the payroll ledger, not only an annual percentage

Read exactness within the supported model

Treat sharing and saving as private choices

Frequently Asked Questions

Get a branded PDF of your results

Keep Exploring

Related calculators

Guides & articles

Glossary terms