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Safe withdrawal rate in the UK

A safe withdrawal rate (SWR) is the percentage of your pot you can draw in year one — then increase with inflation — with a high chance of not running out. The famous 4% rule (equivalently, a pot of 25× your spending) comes from US research on 30-year retirements. UK early retirees often use a slightly lower rate — around 3.25%–4% — because retirements starting in your 40s or 50s are longer, and UK tax on withdrawals eats into what 4% actually delivers.

Why the 4% rule needs care in the UK

The 4% rule assumes a ~30-year horizon and untaxed withdrawals. A UK early retiree may need the money to last 40–50 years, and pays tax on pension income and on gains in a taxable account — so a flat 4% can be optimistic. Many plans use 3.25–3.75% for long or conservative retirements, accepting a bigger pot for a wider safety margin.

The rate isn't the whole story

What actually sinks retirements is sequence-of-returns risk — a bad run of markets early on — not the headline rate. That's why a fixed SWR is only a starting point: modelling market crashes (Monte Carlo and historical backtests) and adding modest spending flexibility in downturns tells you far more than picking 4% vs 3.5%. The calculator lets you set the rate and stress-tests it both ways.

Model your own numbers — ISA/SIPP split, the bridge to 57, Monte Carlo and more.

Open the free UK FIRE calculator →

Frequently asked questions

What is a safe withdrawal rate in the UK?

Commonly 3.25%–4% of your pot in year one, rising with inflation. UK early retirees often use the lower end because retirements are longer and withdrawals are taxed.

Does the 4% rule work in the UK?

As a rough benchmark, yes — but it was built for 30-year, untaxed US retirements. For a long UK early retirement with tax on withdrawals, a slightly lower rate or a stress-tested plan is more reliable.

What withdrawal rate should I use to retire early?

There is no single answer — it depends on your horizon, spending flexibility and how much certainty you want. Model your rate against market-crash scenarios rather than trusting a single number.

How much to retire?How much you need to retire in the UK, by target income — computed with UK tax on withdrawals. Coast, Lean & Barista FIREThe main flavours of FIRE for a UK audience — Coast, Lean, Barista, Fat and standard FIRE — what each means, the rough numbers, and which suits which situation. Is £1 million enough?What a £1,000,000 pot supports in the UK — sustainable income on a 4% rate, the impact of tax and the bridge to pension age, and where the State Pension fits.

InflectionFI is an educational planning tool, not financial or tax advice. Figures are estimates based on your inputs and stated assumptions. Verify your situation with a qualified adviser.