Learn / Retirement planning

What is Coast FIRE?

Understand the savings milestone, calculate a starting estimate, and see why reaching it is not the same as being ready to retire.

By Coast FIRE Planning · Updated November 10, 2026

What does Coast FIRE mean?

FIRE stands for financial independence, retire early. Financial independence means having enough resources to cover your spending without relying on a paycheck. Coast FIRE uses the same long-term goal, but focuses on an earlier milestone: the point when you might no longer need to add new retirement savings.

The idea depends on compound growth: your investments can earn returns, and those returns can earn returns of their own. More time gives that process more room to work. Investment growth is uncertain, though. A calculation that assumes steady growth is a planning estimate, not a promise.

If you reach your Coast number, you could keep saving, reduce your hours, change jobs, or use more of your earnings for current needs. None of those choices is required. Continuing to save adds room for lower returns, higher spending, or an earlier retirement.

How to calculate your Coast FIRE number

You need four inputs: your age, your planned retirement age, your annual retirement spending, and assumptions about investment growth and withdrawals. Start with spending in today's dollars, including taxes you expect to pay from withdrawals.

1. Find your retirement target. Divide the yearly amount your investments must provide by your withdrawal rate.
2. Count your years to retirement. Subtract your current age from your planned retirement age.
3. Work backward. Divide the retirement target by the growth factor for those years, using a real return.

A Coast FIRE example at age 35

Suppose you are 35, plan to retire at 65, and need investments to provide $60,000 a year in today's dollars. At a 4% withdrawal rate, the retirement target is $1,500,000. With 30 years of growth at 5% after inflation, the Coast number is $347,066.

That amount, left invested with no new deposits and no withdrawals, would reach $1,500,000 if it earned exactly the assumed return. It does not pay your living expenses during those 30 years. You still need to fund housing, food, health care, taxes, and other costs separately.

This simple example leaves out Social Security, pensions, and an extra cash reserve. It does not calculate taxes account by account. Those details can materially change the result.

Open this age-35 example in the calculator. This loads example inputs in place of saved calculator inputs; then change them to your own numbers. For more comparisons, see Coast FIRE numbers at 30, 35, 40 and 45.

Coast FIRE vs. FIRE vs. Barista FIRE

Coast FIRE

You still earn enough for current spending, but your invested savings are projected to fund retirement later without more contributions.

FIRE

You have enough resources to cover spending now without employment income, subject to your plan's risks and assumptions.

Barista FIRE

You combine some investment withdrawals with part-time or lower-paid work. People sometimes use the term for work that also provides health insurance, but benefits depend on the employer.

These labels describe different funding plans, not fixed account balances. The same savings can be enough for one person's budget and far too little for another's.

What to check before reducing retirement contributions

• Current bills and emergency savings. Your Coast number is money invested for later. Cash for unexpected expenses is a separate need.
• Employer contributions. Reducing workplace savings may mean giving up an employer match. Compare that cost before changing your contributions.
• Health insurance and debt. A lower-paid job can change benefits. Include premiums, out-of-pocket costs, and debt payments in the budget.
• Investment risk. Lower returns or losses can move you back below your Coast number. Try less favorable assumptions rather than relying on one result.
• Retirement spending. Include taxes, housing repairs, and irregular costs. A higher spending goal raises both your retirement target and your Coast number.
• Withdrawal planning. A 4% rate is a starting assumption, not a guarantee. A long retirement or less flexible spending may call for testing lower rates. A 5% rate needs more caution.

If you are still building savings, the next-dollar guide explains a common order for comparing retirement and investment accounts. It is separate from deciding whether you can stop contributing.

Planning with a partner

Use total household spending and the investments available for that shared plan. Do not double the spending number if it already covers both people. Different ages, retirement dates, and benefits need a more detailed timeline; the calculator lets you add a partner to model those differences.

Common Coast FIRE questions

Does Coast FIRE mean I can retire today?

No. It means your existing investments may be enough for a future retirement if the assumptions hold. Retiring today would require a plan to cover spending from today onward.

What if I have not reached my Coast number?

You can keep contributing, revisit your retirement date, or test a different spending budget. Raising the assumed return makes the number look smaller but does not make the plan more reliable.

Is Coast FIRE permanent once I reach it?

No. Market prices, spending needs, family circumstances, and retirement dates change. Review the estimate regularly and after major life changes, especially before cutting contributions.

Can I count my home?

Not as an invested balance unless your plan explains how it will produce retirement spending money. Selling, downsizing, or renting can affect the plan, but home value alone does not pay expenses.

For education only, not investment, tax, or legal advice. Examples are estimates, not forecasts or guarantees.