457(b) Growth Calculator
Estimate how a 457(b) balance could build over time so you can see the combined effect of deferred compensation contributions, employer funding, return assumptions, and years left to invest.
Calculator
457(b) Growth Calculator
Add the balances already sitting in 457(b).
Starting balance total: $51,000.00
Add employee deferrals and any employer contribution you want included in the deferred-comp projection.
Total monthly contribution: $725.00
Use a long-run estimate that matches how the money is invested or saved.
Choose how many years the balance has to grow.
Example values are loaded.
Result
Your result
457(b) could grow to about $491,412.25 over 18 years on this plan.
Future value
$491,412.25
Total deposits
$207,600.00
Growth
$283,812.25
Projection assumptions
Next steps
Compare before you move on
Most people use one calculator to answer the first question and a related tool to pressure-test the decision.
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What this calculator shows
457(b) growth usually depends on the current balance, ongoing deferred-comp contributions, any employer contribution, and how many years the money can keep compounding.
This page is best for first-pass deferred-comp planning, not for modeling every governmental or nongovernmental plan rule.
How to use it
- 1. Add the balances already sitting in the 457(b).
- 2. Add employee deferrals and any employer contribution you want included in the projection.
- 3. Set the expected annual return and time horizon to estimate future value, deposits, and growth.
Formula and assumptions
The balance compounds monthly at the annual rate divided by 12 and adds the combined contribution sources in each period.
Total deposits include the starting balance plus both employee and employer contributions entered into the model.
Notes
This does not model plan eligibility differences, annual IRS limits, special catch-up rules, distribution timing rules, or differences between governmental and nongovernmental 457(b) plans.
Worked example
$51,000.00 plus split contribution sources gives a better deferred-comp baseline than treating the account like a generic retirement bucket.
This example uses the default sample inputs loaded on reset. It does not update with the live calculator entries above.
Future value
$491,412.25
Total deposits
$207,600.00
Growth
$283,812.25
Feedback
Found a problem on this page?
Report confusing fields, broken math, or missing assumptions with the exact inputs you used so the issue can be reproduced.
FAQ
FAQ
Does this calculator account for special 457(b) catch-up rules?
No. It projects the contribution sources you enter and does not calculate special catch-up eligibility or annual contribution caps.
FAQ
Why mention governmental and nongovernmental plans in the notes?
Because those plan types can have different distribution and risk considerations that this simple projection does not attempt to model.