How much do you need to retire early?

Retiring in your 40s or early 50s is mostly a math problem. You need enough invested that withdrawals cover your spending for a very long time. You also need a way to reach that money before the usual retirement-account age.

People who chase this goal often call it FIRE: financial independence, retire early. This guide covers how to size the target, which costs are easy to forget, and how the money comes out.

Start with spending, not income

Your target depends on what you'll spend, not what you earn today. Build a realistic yearly budget for early retirement:

• Everyday living costs. Housing, food, transport, travel and hobbies.
• Health insurance. Without an employer plan, you buy your own until Medicare at 65. See retiring before 65.
• Taxes. Often low in early retirement, but not zero.
• Big irregular costs. Cars, roofs, helping children. Spread them into a yearly amount.

Then subtract any income you'll still have, such as part-time work or rent from a property.

Turn spending into a target

A withdrawal rate converts yearly spending into a nest egg. Divide spending by the rate:

The familiar "25 times spending" comes from the 4% rule. That rule was tested over 30-year retirements. Retire at 45 and your money may need to last 50 years. Historical tests of longer periods point to starting rates nearer 3% to 3.5% for spending that never adjusts.

Flexibility changes the answer. If you can trim spending after a bad market year, or earn a little, you can start higher. If your budget has no slack, start lower.

Social Security lowers the long-run need

Early retirees still usually collect Social Security, starting between 62 and 70. Benefits are based on your highest 35 years of earnings. Stopping work at 40 leaves some zero years in that average, so your benefit will be smaller than your statement's projection, which assumes you keep working.

Even a reduced benefit helps. Once it starts, your savings only need to cover the gap.

A worked example

Maya and Theo are both 40. They plan to stop working at 45 and expect to spend $64,000 a year in today's dollars, including health insurance. They estimate Social Security of $30,000 a year combined from 67, already reduced for their shorter careers.

• Until 67: savings pay all $64,000 a year for 22 years.
• From 67: savings pay $34,000 a year, the gap left after benefits.

At a 3.5% rate on the full $64,000, they'd need about $1,830,000. That ignores Social Security. At 4% on just the later gap, they'd need $850,000, which ignores the 22 bridge years. The real answer sits between the two. A year-by-year projection is the way to find it, because it handles both phases and the taxes in each.

Getting money out before 59½

Withdrawals from 401(k)s and IRAs before age 59.5 usually add a 10% penalty on top of income tax. Early retirees plan around that with several sources:

1. Taxable brokerage accounts. No age limits. You pay tax only on gains, often at low rates.
2. Roth IRA contributions. What you put in can come out at any time, tax- and penalty-free.
3. A Roth conversion ladder. Convert some traditional money to Roth each year. Each conversion can come out penalty-free five years later.
4. Governmental 457(b) plans. No early-withdrawal penalty once you leave that employer.
5. The Rule of 55 and 72(t) payments. Two exceptions for 401(k)s and IRAs. See the Rule of 55 and 72(t).

A common pattern is to live on taxable savings for the first five years while converting traditional money to Roth. From year six, the ladder starts paying out.

Taxes can be very low

With little earned income, early retirees often pay little federal income tax. Long-term capital gains and qualified dividends are taxed at 0% while taxable income stays under $98,900 for a married couple in 2026. Add the standard deduction of $32,200, and a couple living only on such income could have up to $131,100 with no federal income tax.

Roth conversions use the same room. Ordinary income such as a conversion fills the brackets first and pushes gains toward the 15% rate. Planning which to use each year is where a projection earns its keep. See Roth conversions and capital gains harvesting.

Low income also matters for marketplace health insurance. The premium tax credit depends on income, and it can vanish above a cliff. See IRMAA and ACA subsidy cliffs.

How the app handles early retirement

You set each person's retirement age in the plan. The app then projects every month to the end of the plan, with taxes, health insurance and Social Security.

When it withdraws, the app uses money that can come out without a penalty first. It tracks Roth contributions and each conversion's five-year clock. It recognizes the Rule of 55 for workplace plans and penalty-free 457(b) withdrawals after you leave the job. Anything else taken early pays the 10% penalty in the projection.

Before Medicare, you enter your marketplace premium and the benchmark silver plan, and the app works out the premium tax credit from your income. Social Security can be estimated from your earnings record, which captures the effect of a shorter career.

The What if screen shows a "When to retire" view and a map of retirement age against spending. Ways to improve finds the smallest change, such as a later date or lower spending, that reaches your target chance of success.

Frequently asked questions

Is 25 times spending enough to retire at 40?

It may be too thin for spending that never adjusts over 50 years. Many early retirees aim for 28 to 33 times spending, or plan to stay flexible. Test both on your plan.

Should I plan to age 100?

A long plan end costs little to test and protects against outliving your money. Many planners use 95 or older for at least one spouse.

What about working part time?

Even small earnings early on make a big difference. Each dollar earned in the first years is a dollar not withdrawn when sequence risk is highest. See sequence-of-returns risk.