401(k) Employer Match Optimizer Calculator
Maximize your 401(k) employer match.
Enter salary, contribution percentage, and match formula to see free-money capture rate and optimal contribution level.
401(k) Employer Match
Most employer matches follow a simple percentage formula:
- “100% of the first 3% you contribute” — you put in 3%, employer adds 3% (3% of salary)
- “50% of up to 6%” — you put in 6%, employer adds 3% (50% of 6%)
- “100% of first 4% + 50% of next 2%” — tiered, max match 5%
Common formulas:
| Formula | Max Employer Match | Required Employee Contribution |
|---|---|---|
| 100% of 3% | 3% | 3% |
| 50% of 6% | 3% | 6% |
| 100% of 4% + 50% of 2% | 5% | 6% |
| 100% of 6% | 6% | 6% |
| 25% of 10% | 2.5% | 10% |
| Safe harbor: 100% of 3% + 50% of 2% | 4% | 5% |
The “free money” rule: Always contribute at least enough to capture the full match. Employer match is part of total compensation — leaving it on the table is equivalent to refusing a raise.
2026 IRS contribution limits:
- Employee 401(k): $23,500 ($31,000 if age 50+)
- Total (employee + employer + after-tax): $70,000 ($77,500 if age 50+)
- IRA: $7,000 ($8,000 if 50+)
Match formula math examples:
Example 1: Salary $80,000, formula 50% of 6%, contribute 6%
- Your contribution: $80,000 × 6% = $4,800
- Match: $4,800 × 50% = $2,400 (or 3% of salary)
- Total: $7,200
Example 2: Same salary, contribute 4% (under match cap)
- Your: $3,200
- Match: $3,200 × 50% = $1,600
- Total: $4,800
- You missed $800/year of free money ($2,400 - $1,600)
Example 3: Salary $80,000, contribute 15% (over match cap)
- Your: $12,000
- Match: still capped at $2,400 (50% of 6%)
- Total: $14,400 — extra contribution is your money, not matched
True-up provisions: Some plans match per-paycheck (you must spread contribution across the year), others have a year-end “true-up” (back-fill match if you front-loaded contributions).
Without true-up: if you max out by July, you stop getting matches Aug-Dec — losing 5+ months of match. With true-up: front-loading is safe — the company catches up at year-end.
Always check your plan documents for true-up clauses. Without a true-up, contribute steadily through the year, not lump-sum.
Vesting schedules:
| Type | When You Own Match |
|---|---|
| Immediate | Day 1 — you own 100% of match |
| Cliff (3-year) | 0% for 3 years, then 100% |
| Graded (5-year) | 20% per year (20/40/60/80/100) |
| Graded (6-year) | 0/0/20/40/60/80/100 |
If you leave before fully vested, you forfeit the unvested portion of match. Bonus consideration when accepting a new job.
Mega backdoor Roth (advanced): If your plan allows after-tax contributions and in-service withdrawals, you can get up to $70,000 total into a 401(k), then convert the after-tax portion to a Roth. Few plans offer this — check your Summary Plan Description.