RSU Vesting Break-Even Age Calculator

Estimate the age at which the future value of vested RSU proceeds reaches a target amount. The calculator treats the current after-tax RSU value as a starting investment balance, compounds it at your assumed annual return, and finds the first age at which the target is met.

This can help with long-range planning when you are deciding how vested equity might contribute to a retirement, education, home, or other future funding target. The model is intentionally simple: it does not add future RSU grants, taxes on investment returns, or withdrawals unless you incorporate those effects into your inputs.

Inputs

years
USD
USD
%
years
Result
Estimated break-even age
Years to target
Break-even age
Value at break-even
Growth needed

1. Enter your current age
Use your age today as the starting point for the time calculation.

2. Enter the current RSU value
Use the after-tax amount you consider available as the starting invested value.

3. Set the target
Enter the future dollar amount you want the RSU-derived balance to reach.

4. Choose a return assumption
Apply a constant annual return to the balance for this scenario.

5. Set a maximum age
The tool checks each year until the target is met or this age is reached.

Future value after n years = starting value × (1 + annual return)^n
Break-even age = current age + smallest whole n for which future value ≥ target

Where:

  • starting value = current after-tax RSU-derived balance, in dollars
  • annual return = assumed yearly investment return as a decimal
  • n = number of whole years after the current age

Assumptions: The calculator checks whole years and assumes no contributions or withdrawals. A negative return can prevent the target from being reached.

What the result means

The result depends on a constant return assumption and does not include future grants, withdrawals, or investment taxes.

Change one assumption at a time to compare scenarios and understand which input has the largest effect on the result.

Given:

  • Current age: 35
  • Starting after-tax RSU value: $50,000
  • Target: $100,000
  • Expected annual return: 7%
  • Maximum age: 90

Calculation:
After 10 years, $50,000 × 1.07^10 is about $98,358. After 11 years it is about $105,243, which first exceeds the $100,000 target.

Result:
Estimated break-even age = 46.

Interpretation: Under a constant 7% return, the modeled balance reaches the target during the eleventh year after age 35.

Why does the calculator report a whole-number age?

It checks the balance once per year. The actual mathematical crossing could occur between birthdays, but the tool uses whole years for a simple planning result.

Should the starting value be before or after tax?

The title is focused on RSU vesting, so after-tax value is usually the cleaner starting point for personal planning. If you enter a pre-tax value, the result will not account for the tax reduction unless you adjust the input yourself.

Can I include future RSU grants?

Not directly. This model compounds one starting balance only. Future grants would require a multi-contribution cash-flow model.

What if the target is already below the starting value?

The target is considered reached immediately, so years to target are zero and the break-even age is your current age.

Is the expected return guaranteed?

No. It is a scenario assumption. Actual returns can be volatile and may be lower or higher, which changes the age at which the target is reached.