401(k) Employer Match & True-Up Calculator
Ensure you leave zero free company money on the table. Calculate paycheck deductions, match return on investment, vesting schedules, and 30-year compounding.
An employer 401(k) match provides an instant guaranteed 50% to 100% return on your money on the day you contribute. For example, on a $100,000 salary with a 50% match on the first 6% of pay, contributing $6,000 triggers a $3,000/year company match ($250/mo in free money). Compounded at 8% annual returns over 30 years, the employer match alone grows into over $367,000 of extra retirement wealth!
Compensation & Match Formula
Match Breakdown & Return on Investment
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The $120,000 Free Money Trap: How Front-Loading a 401(k) Lost $3,000/yr Without a True-Up
A deep quantitative analysis of paycheck matching schedules, the IRS annual elective deferral cap, and true-up matching provisions.
The Per-Paycheck Match Trap
Most corporate 401(k) plans match on a per-paycheck basis (e.g. 50% match up to 6% of each paycheck). If an ambitious employee front-loads their retirement contributions to max out the IRS limit ($23,500 in 2026) early in the year (e.g. by August), employee paycheck deductions stop for September through December. Unless the employer has a contractual True-Up Provision, the company match ceases for those remaining 4 months—permanently forfeiting thousands of dollars in guaranteed matching money.
The Scenario: Alex's $160,000 Tech Salary
Alex works at a mid-sized tech company earning $160,000 paid bi-weekly across 26 pay periods ($6,153.85 per paycheck). The company offers a 50% match on the first 6% of salary (a maximum match of 3% or $4,800/year, equating to $184.62 per paycheck).
Deduction: 25% ($1,538/check)
Hits $23,500 Cap: Paycheck #16 (August)
Total Match: $2,954 (Lost $1,846!)
Deduction: 14.69% ($903.85/check)
Hits $23,500 Cap: Paycheck #26 (December)
Total Match: $4,800 (100% Captured)
Annual Delta: $1,846 / year
@ 8% S&P 500 Return:
+$227,579 Extra Wealth at 65!
Paycheck Match Allocation Waterfall
| Contribution Strategy | Paychecks Contributed | Employee Deferral | Employer Match | Forfeited Match |
|---|---|---|---|---|
| Aggressive Front-Load (25% Deferral, No True-Up) | 16 of 26 Paychecks | $23,500 (Maxed) | $2,954 | -$1,846 |
| Front-Load with Employer True-Up Clause | 16 Checks + Year-End True-Up | $23,500 (Maxed) | $4,800 | $0.00 |
| Paced Even Spread (14.69% Across 26 Paychecks) | 26 of 26 Paychecks | $23,500 (Maxed) | $4,800 | $0.00 |
How to Protect Your 401(k) Match
Always review your company's Summary Plan Description (SPD) to verify whether a True-Up Provision is included. If your plan does not offer a true-up, calculate your exact paycheck percentage ($23,500 ÷ Annual Salary ÷ Pay Periods) to spread contributions evenly across all paychecks through the last pay period of December.
Frequently Asked Questions (401k Match & Compounding)
What is a 401(k) True-Up provision and why is it critical?
A 401(k) True-Up provision ensures that employees who max out their annual contribution limit early in the calendar year still receive their full matching dollars. Without a true-up, companies matching per-paycheck stop contributing the moment employee paycheck deductions reach $0.
What is the difference between a 50% match up to 6% vs 100% match up to 3%?
Both formulas yield the exact same 3% maximum employer contribution. However, a 50% match up to 6% requires you to save 6% of your own salary to get the full 3% match, whereas a 100% match up to 3% gives you the maximum match with only a 3% employee contribution.
What is a Safe Harbor 401(k) match?
A Safe Harbor 401(k) match is a mandatory employer contribution (typically 100% match on the first 3% plus 50% on the next 2%, or a 3% non-elective contribution) that vests 100% immediately on day one, exempting the company from IRS annual nondiscrimination testing.