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 immediate 50% to 100% addition to the money you contribute 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 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.
What this calculator does
The 401(k) Employer Match & True-Up Calculator allows employees to model their retirement savings and optimize their paycheck deferrals to capture every dollar of available company match. It is designed for employees navigating their company's 401(k) or 403(b) benefits package who need a clear picture of how much they must contribute per paycheck to maximize their matching funds. By inputting your annual salary, pay frequency, matching formula, and target contribution rate, you can instantly see your per-paycheck deduction, the exact dollar amount of free employer money you will capture, and the 30-year compounded wealth generated by these combined contributions. It also helps model the impact of Solo 401k limits if you run a side business.
How the math works
The underlying calculations for employer matching strictly follow the statutory limits set forth in IRC §401(k) and detailed in IRS Publication 560. For the 2026 tax year, the IRS defines the annual elective deferral limit at $23,500 for individuals under age 50. The calculator determines your matching eligibility on a per-paycheck basis by dividing your annual salary by your chosen pay periods, then applying the employer's specified match percentage up to the designated salary cap.
For instance, a standard 50% match up to 6% means the employer contributes 50 cents for every dollar the employee defers, up to a maximum employee deferral of 6% of gross pay. The true-up logic evaluates whether front-loading contributions (reaching the 2026 cap early) would result in missed matching funds in later pay periods, adjusting the total employer contribution accordingly based on the presence of a true-up provision.
Worked example
Consider an employee with a $100,000 annual salary paid semi-monthly (24 paychecks per year) with an employer match of 100% on the first 4% of compensation.
If the employee sets a target contribution rate of 10%, their gross pay per period is $4,166.67. The employee defers $416.67 per paycheck into their 401(k). The employer matches 100% of the first 4%, which equates to $166.67 per paycheck. Over the course of the 2026 calendar year, the employee contributes a total of $10,000, and the employer contributes $4,000 in matching funds. The combined total addition to the retirement account is $14,000 for the year, generated without exceeding the $23,500 IRS limit.
Frequently Asked Questions
What is the 2026 IRS contribution limit for a 401(k)?
For the 2026 tax year, the standard IRS elective deferral limit is $23,500 for individuals under age 50. Employees aged 50 and older are eligible for an additional catch-up contribution.
Do employer matching funds count toward my personal 401(k) limit?
No. The $23,500 personal elective deferral limit for 2026 only applies to the money you contribute from your own paycheck. Employer matching contributions fall under a separate, higher overall combined limit (the section 415 limit).
Can I lose my 401(k) match if I leave my job?
Yes, if your employer uses a vesting schedule and you depart before becoming fully vested. For example, under a 3-year cliff vesting schedule, leaving after 2 years means you forfeit 100% of the matching funds. However, your own personal contributions are always 100% vested and belong to you immediately.