FIRE number for $40k a year
To reach FIRE — financial independence, retire early — on $40,000/year, your number is about $1,100,000 if you retire at 45. That's roughly 28× your spending, above the classic 25× because early retirement means a longer horizon and withdrawals get taxed.
FIRE number for $40k/year, by retirement age
The earlier you retire, the bigger the number — the money must last longer and Social Security is further away. Assuming 6% return, 3% inflation, no Social Security:
| Retire at | Horizon | You need about |
|---|---|---|
| 40 | 55 yrs | $1,150,000 |
| 45 | 50 yrs | $1,100,000 |
| 50 | 45 yrs | $1,050,000 |
| 55 | 40 yrs | $990,000 |
Getting there: the savings rate that matters
Your FIRE number tells you the target; your savings rate tells you how fast you'll reach it. The core FIRE insight is that a high savings rate does double duty — it builds the nest egg faster and proves you can live on less, which shrinks the number you need. Coast and Barista FIRE are milestones along the way: once you've saved enough that compounding alone will get you to the target, you can ease off.
Early retirement makes pre-Medicare healthcare, sequence-of-returns risk, and taxes the dominant challenges. Model your accounts, savings rate, and Social Security in the calculator for a personalized number and date.
How much of a modest budget you actually have to self-fund
A budget in this range sits at the lean-ish end of FIRE, and the headline number is simply that spending run through the classic multiple. But the multiple quietly assumes your portfolio covers every dollar for the rest of your life, and for most people it will not have to. Social Security eventually shoulders a meaningful slice of a modest budget, which changes what you truly need to accumulate.
The nuance is where the portfolio's job ends. Your savings must fully fund the years before benefits begin, and after that only the gap between your spending and your benefit. Because a modest budget is a smaller target to start with, a given Social Security benefit covers a larger share of it than it would a lavish one, so the amount you self-fund can fall well below the naive multiple.
Two cautions keep that from becoming wishful thinking. The bridge years between stopping work and claiming still come entirely from savings, arriving right when sequence-of-returns risk is highest; and the age you claim moves the benefit, since delaying raises it. Pre-Medicare healthcare, priced off your MAGI on the ACA marketplace, is also a large line against a small budget.
Common questions
What is the FIRE number for $40,000 a year?
About $1,100,000 retiring at 45 — roughly 28× spending. Retiring at 55 instead needs less, because the money has fewer years to cover and Social Security is closer.
Is $40k/year enough to retire early on?
It can be, with about $1,100,000 invested at 45. Whether it's "enough" depends on your lifestyle, healthcare costs before Medicare, and whether you'll have other income like a pension or part-time work.
How is a FIRE number different from a regular retirement number?
The math is the same, but FIRE targets an earlier retirement, so the horizon is longer and the multiple of spending you need is higher than the classic 25× used for a retirement starting at 65.