403b Calculator
Calculate your 403(b) retirement plan growth with employer match, catch-up contributions, tax savings, and year-by-year projection tables.
About
A 403(b) plan is a tax-sheltered annuity program available to employees of public schools, certain nonprofits, and religious organizations under IRC §403(b). Contributions reduce current taxable income, and investment gains compound tax-deferred until withdrawal. The IRS sets annual elective deferral limits - 23,500 $ for 2025, with an additional 7,500 $ catch-up allowance for participants aged 50+. Miscalculating contribution rates or ignoring employer match schedules can leave tens of thousands of dollars on the table over a career. This calculator models year-by-year compounding with salary growth, employer matching, IRS contribution caps, and federal tax bracket estimation to project your 403(b) balance at retirement.
The projection assumes a constant annual rate of return r applied to end-of-year balances after contributions. Real-world returns fluctuate. This tool approximates growth assuming reinvested returns and no early withdrawals. Pro Tip: maximize employer match first - it is effectively a 100% return on contributed dollars.
Formulas
The future balance is computed via iterative annual compounding. For each year t, the balance grows as:
Where the employee contribution for year t is:
And salary in year t with annual raise g:
The employer match contribution is:
Where: Bt = balance at end of year t. Ct = employee contribution (capped at IRS limit Lt). Mt = employer match contribution. St = annual salary in year t. p = employee contribution rate (as decimal). r = annual rate of return (as decimal). g = annual salary growth rate. mrate = employer match percentage. mcap = maximum salary percentage employer will match. L415 = IRC §415(c) annual additions limit.
Reference Data
| Parameter | 2024 | 2025 | Notes |
|---|---|---|---|
| Elective Deferral Limit (Under 50) | 23,000 $ | 23,500 $ | IRC §402(g) |
| Catch-Up Contribution (Age 50+) | 7,500 $ | 7,500 $ | IRC §414(v) |
| Total Limit (50+) | 30,500 $ | 31,000 $ | Deferral + Catch-Up |
| Super Catch-Up (Age 60-63) | - | 11,250 $ | SECURE 2.0 Act, replaces standard catch-up |
| Total Limit (Age 60-63) | - | 34,750 $ | New for 2025 |
| 415(c) Annual Additions Limit | 69,000 $ | 70,000 $ | Employee + Employer total |
| 15-Year Service Catch-Up | 3,000 $ | 3,000 $ | Max lifetime 15,000 $ |
| Early Withdrawal Penalty | 10% | Before age 59½ | |
| RMD Start Age | 73 | SECURE 2.0: age 75 starting 2033 | |
| Federal Tax Bracket: 10% | 0 - 11,600 $ | Single filer, 2025 | |
| Federal Tax Bracket: 12% | 11,601 - 47,150 $ | Single filer, 2025 | |
| Federal Tax Bracket: 22% | 47,151 - 100,525 $ | Single filer, 2025 | |
| Federal Tax Bracket: 24% | 100,526 - 191,950 $ | Single filer, 2025 | |
| Federal Tax Bracket: 32% | 191,951 - 243,725 $ | Single filer, 2025 | |
| Federal Tax Bracket: 35% | 243,726 - 609,350 $ | Single filer, 2025 | |
| Federal Tax Bracket: 37% | > 609,350 $ | Single filer, 2025 | |
| Typical Employer Match | 50% up to 6% | Varies by employer | |
| Historical S&P 500 Avg Return | 10.3% | Nominal, 1926-2024 | |
| Historical Inflation Avg | 3.0% | CPI-U long-term average | |