UK Safe Withdrawal Rate (SWR) Calculator
Calculate your 4% Rule FIRE number — with UK State Pension and ISA context
Inputs
FIRE Number = Annual Expenses × 25. Withdraw 4% in year one, then adjust for inflation.
How the 4% Rule Works in the UK
The 4% rule — also called the safe withdrawal rate (SWR) — is the cornerstone of FIRE retirement planning. Withdraw 4% of your portfolio in year one, adjust for inflation each year, and your portfolio has historically survived 30-year retirements. Multiply your annual expenses by 25 to get your FIRE number.
The original Trinity Study research was based on US data. UK investors can apply the same principle, but there are important local differences.
Why UK FIRE Numbers Are Often Lower Than You Think
- The NHS: Healthcare in retirement is effectively free. US FIRE planners must budget for private health insurance before Medicare. UK early retirees have no such cost.
- State Pension: The full UK State Pension is £11,502/year (2025/26), payable from age 67 with 35 qualifying National Insurance years. A couple both receiving the full State Pension gets £23,004/year in guaranteed, inflation-linked income.
ISA vs SIPP: Which to Draw First?
ISA withdrawals are tax-free and do not count as income — drawing from your ISA first keeps your taxable income low and preserves your Personal Allowance (£12,570). SIPP withdrawals are taxed as income. Delay SIPP access until you have lower overall income to reduce the tax paid. The first 25% of your SIPP (up to £268,275 lifetime limit) can be taken tax-free from age 57.
Frequently Asked Questions
Is £1 million enough to retire at 55 in the UK?
Yes, for most people. At a 3.5% withdrawal rate, £1 million supports £35,000/year — comfortably above the UK median income. From age 67, the State Pension (£11,502/year) adds further income, reducing portfolio withdrawals significantly. With ISA savings bridging the years before SIPP access, retiring at 55 on £1 million is achievable for households with moderate lifestyle costs.
Can I retire at 60 with £250,000 in the UK?
At a 4% withdrawal rate, £250,000 generates £10,000/year. From age 67, the State Pension adds £11,502, bringing total income to around £21,500/year. This is tight but workable in lower cost-of-living areas if you own your home. Many people supplement with part-time work (Barista FIRE) to bridge the gap comfortably.
Can I retire with £500,000 in the UK at 60?
£500,000 at 3.5% SWR supports £17,500/year from your portfolio. Add the State Pension at 67 and total income reaches approximately £29,000/year — close to the UK average wage after tax. This is viable outside London, particularly if you own your home outright. A couple with two State Pensions is in a considerably stronger position.
How does the 4% rule work in the UK?
Withdraw 4% of your portfolio in year one, then increase by inflation each year. Multiply your annual expenses by 25 to get your FIRE number. UK investors benefit from tax-free ISA withdrawals and the State Pension, both of which reduce the total portfolio size needed compared to US-style retirement planning.
Should UK early retirees use 3.5% instead of 4%?
For retirements of 40+ years, 3.5% reduces the historical failure rate to near zero. The trade-off is a larger required portfolio (28.6× vs 25× annual expenses). UK advantages — the NHS eliminating healthcare costs and the State Pension providing a guaranteed income floor — can partially offset the need to be this conservative.
This calculator is for illustrative purposes only and does not constitute financial advice. Tax rules and allowances can change. For advice specific to your circumstances, consult a qualified financial adviser. State Pension figures are based on 2025/26 rates.
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