Coast FIRE at 25: How Much Do You Need Saved?

There is no universal Coast FIRE amount for age 25. The target depends on expected retirement spending, retirement age, withdrawal rate and investment assumptions. Use the calculator above to generate the modeled target for your own inputs rather than relying on a single age-based number.

It can be tested, but the balance alone is not enough information. $25,000 has 40 years to grow if retirement is set to 65, but whether that reaches the required target depends on retirement spending and the selected assumptions. Use $25,000 in the starting-balance comparison to see the result.

Possibly under some combinations of retirement age, spending and growth assumptions, and not under others. Enter or select $50,000 above and compare its projected future value with your own retirement target rather than treating $50,000 as a universal Coast FIRE threshold.

The calculator can answer this only after the retirement target is defined. A $100,000 portfolio has a long modeled growth period at age 25, but higher retirement spending, an earlier retirement age or lower growth assumptions can materially raise the amount needed today.

Age 25 can leave several decades for compounding, so a present-value Coast FIRE target may be much lower than the full retirement portfolio target. The result can still be highly sensitive to assumptions over a 40-year period, which is why the long-horizon stress check above is useful.

There is no mathematical minimum age. The main challenge at 25 is that retirement spending, retirement age and investment assumptions may change substantially over several decades. Treat the calculation as a current planning estimate and rerun it when the plan changes.

The current portfolio remains invested and can still gain or lose value. The no-contribution tool models what that balance could become by the selected retirement age using your assumptions. It is a projection, not a guarantee that the target will be reached.

Continuing contributions creates additional invested principal and gives those contributions time to grow. Use the age-25-to-30 contribution tool above to compare stopping contributions now with contributing for another five years and then stopping.

You do not need to assume one spending estimate will remain correct for 40 years. Start with a reasonable retirement-spending scenario in today’s dollars using the calculator’s methodology, then test lower and higher amounts. Update the estimate as housing, family and lifestyle plans become clearer.

Not if the calculator already asks for spending in today’s dollars and accounts for inflation through its shared methodology. Manually inflating the spending input as well can double-count inflation. Keep the spending and return assumptions in the same dollar framework used by the main calculator.

A 401(k) can be part of the long-term invested retirement portfolio used in a Coast FIRE projection even though access rules may restrict how the money can be used today. That is different from an immediate-retirement question where near-term account access matters.

Retiring at 55 gives an age-25 portfolio 30 modeled growth years instead of 40. Holding the other assumptions constant, that generally changes the amount needed today. Use the retirement-age comparison above to calculate the difference for your inputs.