403b Calculator

Written by Great Medico

Updated September 25, 2026 •3 min read

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Small changes in rates, timing, or balances can change a finance result quickly. 403b Calculator projects how a tax-advantaged savings balance may grow from the current balance, contributions, return assumptions, and time horizon entered, so you can test the scenario instead of relying on a vague rule of thumb.

What this calculator does

403b Calculator projects how a tax-advantaged savings balance may grow from the current balance, contributions, return assumptions, and time horizon entered. The form asks for current balance, your annual contribution, employer match rate, maximum employer match per year, expected annual return, annual account fee, years until withdrawal, and annual contribution limit. The result should therefore be read as a calculation from those displayed assumptions, not as live market, lender, tax, or government-program data unless the page explicitly supplies such a feed.

How to use it

Enter Current balance, Your annual contribution, Employer match rate, Maximum employer match per year, Expected annual return, Annual account fee, Years until withdrawal, and Annual contribution limit. Keep monetary inputs in one currency; the currency selector formats results and does not convert exchange rates. Enter rates and percentages on the scale shown by the field label; do not silently switch between a decimal and a percent. Keep time values in the period shown on the form so a monthly figure is not accidentally entered as an annual one or vice versa. Before calculating, recheck Current balance, Your annual contribution, Employer match rate against the source values you intend to model. If a default value is already filled in, confirm that it matches the scenario you actually want to test rather than assuming the preset is current or personally appropriate.

How the calculation works

The model caps the entered annual employee contribution at the annual-limit field, adds the modeled employer match up to its entered cap, subtracts the annual account fee from the expected annual return, and compounds the resulting balance over the entered years.

Example

With the displayed defaults, including a 24,500 annual elective-deferral cap, the calculator applies the entered contribution, employer match, expected return, and annual fee to project the account balance over 25 years.

How to interpret the result

A larger future value can come from more time, higher contributions, or a higher assumed return. The result is a projection, so it is more useful for comparing scenarios than for predicting the exact account balance on a future date. If the number changes sharply, trace that change to the rate, balance, time horizon, or threshold that changed.

Limitations and notes

This is a projection, not tax or plan advice. The modeled employee contribution is capped by the annual-limit field, the annual account fee reduces the modeled return, and employer-plan rules or catch-up contributions may change the amount a real participant can defer.