403(b) Calculator: Project a Nonprofit and Education Retirement Balance
Project how a 403(b) plan could grow — the retirement account for employees of public schools, universities, hospitals, and other nonprofit organizations.
Adjust the inputs and select Calculate for a full breakdown.
Year-by-year growth schedule
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Future value | Total contributions | Total interest earned |
|---|---|---|---|
| $25k · $600/mo · 7% · 25yr | $629,178.47 | $205,000.00 | $424,178.47 |
| $0 · $400/mo · 8% · 30yr | $596,143.78 | $144,000.00 | $452,143.78 |
| $100k · $1k/mo · 6% · 20yr | $793,061.34 | $340,000.00 | $453,061.34 |
| $5k · $250/mo · 7% · 35yr | $507,794.41 | $110,000.00 | $397,794.41 |
How This Calculator Works
Enter the current 403(b) balance, the expected annual return, the years until retirement, and the monthly contribution (your deferral plus any employer match). The calculator compounds monthly and shows the projected balance plus the share built by investment growth.
The Formula
Future Value with Regular Contributions
P = starting amount, PMT = monthly contribution, r = monthly rate (annual ÷ 12), n = number of months
Worked Example
With $25,000 saved, $600 added monthly, and a 7% average return over 25 years, a 403(b) reaches about $629,000. Contributions account for $205,000; investment growth supplies the remaining $424,000.
Key Insight
The 403(b)'s biggest practical issue is plan-fee variation. Some plans (particularly in K-12 public schools) carry very high expense ratios and embedded annuity fees that consume 1%+ of returns annually — over a career that can mean six figures of foregone growth. Check the fund expense ratios in your specific 403(b) lineup before assuming the headline market return is what you will earn.
Frequently Asked Questions
What is a 403(b)?
A retirement plan for employees of public schools, universities, hospitals, churches, and 501(c)(3) nonprofits. It works similarly to a 401(k) — pre-tax contributions, tax-deferred growth, taxed on withdrawal — with some quirks specific to nonprofit employment.
How much can I contribute?
Annual employee deferral limit matches 401(k) limits (over $23,000 in 2024, with catch-up contributions for those 50+). The 403(b) also allows a separate '15-year rule' catch-up for employees with 15+ years of service.
Are 403(b) plans worse than 401(k)s?
Not inherently, but many 403(b)s (especially in K-12 schools) carry unusually high fees and feature annuity-heavy investment menus. Strong 403(b)s at universities and large hospitals look very similar to 401(k)s. Check your plan's specific lineup.
Can I have both a 403(b) and an IRA?
Yes. The contribution limits are separate, so you can max both. IRA deductibility may phase out at higher incomes if you are also covered by a workplace plan like a 403(b).
What about Roth 403(b)?
Many 403(b) plans offer a Roth bucket — contributions are taxed now, growth and qualified withdrawals are tax-free. Useful for younger employees who expect higher tax brackets later in their careers.
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Data Sources & Benchmarks
This calculator draws on 2 independent, dated sources. The starting values for expected annual return are taken from the benchmarks below and refresh whenever the snapshots are updated.
Methodology & Review
The projection compounds the balance monthly at a constant expected return and adds a fixed monthly contribution. It assumes contributions stay within 403(b) limits and excludes fees, which can be unusually high in some 403(b) plans. Employer match is included only if folded into the monthly contribution.
Written by Ugo Candido · Last updated May 17, 2026.