How much money do I need to be financially independent?

The short answer: take the yearly spending you expect after you stop working, in today’s money, and divide it by a withdrawal rate you could sustain for as long as you expect to be drawing on your savings. At 4% that is 25 times your spending; at 3.5% about 28.6 times; at 3% about 33 times. Then adjust the result for the income you will still have, the one-off costs you can already see coming, and the tax and fees on what you take out.

Where the multiple comes from

The multiple is the arithmetic inverse of a withdrawal rate, and the best-known rate comes from research on US market history. William Bengen (1994) found that withdrawing 4% of a portfolio in the first year, then raising the amount with inflation each year, never exhausted a 50/50 mix of US shares and intermediate-term Treasuries in less than 33 years, for every starting year he tested from 1926. The Trinity study (Cooley, Hubbard and Walz, 1998) reached a similar answer on 1926–1995 data. Both studies looked at roughly 30 years of withdrawals. The 4% rule explains what those studies did and did not show.

Which row fits depends mostly on how long the money has to last. Morningstar’s December 2025 research put the highest safe starting rate at 3.9% for 30 years (with a 90% probability of money remaining), 3.5% for 35 years and just 3.3% for 40 years. Someone stopping work at 45 is closer to the last of those than the first.

Start from the right spending figure

• Spending, not income. What you earn today includes what you save and the tax on your salary; neither continues once you stop.
• The life you will live then. A mortgage paid off, school fees ended or a move to another country can change the figure a great deal, in either direction. Healthcare often rises (why).
• In today’s money. Inflation is dealt with by the withdrawal rate, which assumes the amount rises with prices each year.

Then adjust it

1. Subtract income that carries on — a state pension, a workplace pension, rent — but only from the age it starts. The years before that need funding of their own (how state pensions fit in).
2. Add one-off costs you can already see — a child’s university, a home, replacing a car, care later in life — and any loan payments that continue after you stop.
3. Allow for tax and fees. The Trinity study did not adjust for taxes or transaction costs, and Vanguard notes the original rule did not account for investment fees and that keeping costs low improves the odds.
4. Match the rate to your horizon. The longer the money has to last, the lower the rate and the larger the multiple.

Common mistakes

• Using a 30-year rate for a 45-year horizon.
• Counting the home you live in. It is part of your net worth, but you cannot spend it while living in it.
• Counting pension money from the day you stop, when it may be locked until a later age (when you can reach it).

What would change the answer

Spending less later lowers the target directly; continuing income lowers it from the age it starts; flexibility helps too — Morningstar found that retirees willing to cut spending after bad years could start well above the fixed-spending rate. A longer horizon, higher fees or a higher tax rate raise it.

In Nivritee

Your FI number follows the same logic: the spending your plan expects once you stop, plus loan payments still running, minus income that carries on, grossed up for an assumed tax on withdrawals and divided by a withdrawal rate — 4% for most countries, 3.5% for India, Japan and Europe — with your life goals added on top. The year-by-year projection, with each cost rising at its own rate, is what decides the age you are projected to reach it.