FIRE by Age Calculator UK
Compare FIRE numbers, savings requirements, and timelines for retiring at 40, 45, 50, 55, or 60 — all in £ sterling.
Your Details
ISAs + SIPPs + GIAs combined
Total invested per year
4% standard; 3.5% for early retirement
6–7% typical for global index funds
How Much Do You Need to Retire Early in the UK?
Your required portfolio depends on two things: how much you plan to spend each year in retirement, and your safe withdrawal rate (SWR). The SWR is the percentage of your portfolio you withdraw in year one, adjusting for inflation each year thereafter.
The most widely used benchmark is the 4% rule — at this rate, a diversified portfolio has historically lasted 30+ years in almost all market scenarios. For early retirees with a longer runway, 3–3.5% provides additional safety margin.
| Retirement Age | Recommended SWR | Retirement Length | FIRE Number (£30k/year) |
|---|---|---|---|
| Age 40 | 3–3.5% | 50+ years | £857,000–£1,000,000 |
| Age 45 | 3.5% | 45+ years | £857,000 |
| Age 50 | 3.5–4% | 40+ years | £750,000–£857,000 |
| Age 55 | 4% | 35+ years | £750,000 |
| Age 60 | 4% | 30+ years | £750,000 |
How the State Pension Changes the Numbers
The UK State Pension (£11,502/year in 2025/26, from age 67) is a significant factor in early retirement planning. For someone spending £30,000/year, the State Pension covers 38% of expenses — meaning the long-term portfolio requirement is dramatically reduced once it begins.
Consider a 45-year-old retiring on £30,000/year at 3.5% SWR:
- Without State Pension: Full FIRE number = £857,000, sustained indefinitely
- With State Pension from 67: Long-term portfolio need drops to approximately £524,000 (for £18,498/year from savings). The bridge years (45–67) require the full amount.
The practical implication: targeting the full FIRE number provides a significant safety buffer, with the State Pension acting as a floor that makes portfolio depletion extremely unlikely for UK early retirees.
The Pension Access Age Problem
The minimum pension access age is currently 55, rising to 57 in April 2028. Anyone retiring before 57 cannot touch their SIPP or workplace pension — they must fund those years from ISA savings or other accessible funds.
This is why the ISA is the cornerstone of UK early retirement planning. At any retirement age below 57, you need:
- ISA savings to cover living costs from retirement until age 57 (SIPP access opens)
- SIPP savings to provide long-term retirement income from 57 onwards
- A sequencing strategy that draws ISA first (tax-free, no taxable income impact) before crystallising pension benefits
For someone retiring at 40, this means 17 years on ISA income alone — requiring significant ISA balances built up over the accumulation phase.
What Does Each Retirement Age Actually Look Like?
Retiring at 40
The most ambitious target — a 50+ year retirement period and a 17-year gap before SIPP access. Requires either an extremely high income during accumulation, an exceptionally high savings rate, or both. A saving rate above 50% of net income is typically needed. The benefit: maximum life freedom and the youngest possible health to enjoy it.
Retiring at 45
Still very aggressive, but achievable for high earners who start early. A 12-year gap to SIPP access and a 22-year gap to the State Pension. Requires ISA contributions maximised throughout accumulation. The UK FIRE community has numerous documented examples of people retiring at this age.
Retiring at 50
The sweet spot for many UK FIRE pursuers — ambitious but achievable without extreme sacrifice. A 7-year gap to SIPP access makes ISA planning critical. 40+ year retirement period warrants a 3.5% withdrawal rate rather than 4%. State Pension from 67 dramatically improves sustainability.
Retiring at 55
Near-standard pension access age. From 2028, a 55-year-old retiree needs just 2 years of ISA coverage before SIPP access at 57. At 4% SWR, £750,000 generates £30,000/year. The State Pension from 67 reduces long-term portfolio withdrawals by roughly 38% for a £30k spending target.
Retiring at 60
Conservative early retirement — SIPP accessible, 7-year bridge to State Pension. Many people in traditional defined benefit (final salary) schemes retire at or around this age. For FIRE investors, 60 is achievable even at moderate savings rates, especially for those who started investing in their 20s.
Frequently Asked Questions
How much do I need to retire at 40 in the UK?
At a 3.5% withdrawal rate and £30,000/year spending, you need approximately £857,000. Retiring at 40 means a 17-year gap before SIPP access and 27 years before the State Pension. Use a conservative withdrawal rate and ensure your ISA can cover the pre-pension years.
How much do I need to retire at 50 in the UK?
At a 4% rate and £30,000/year, you need £750,000. At 3.5% (more appropriate for a 40+ year retirement), approximately £857,000. The State Pension from 67 significantly reduces long-term portfolio pressure — effectively making early retirement more sustainable over the full retirement period.
How much do I need to retire at 55 in the UK?
At 4% SWR and £30,000/year spending, £750,000. From 2028, SIPP access opens at 57, so a 55-year-old needs 2 years of ISA income before pension access. State Pension from 67 adds £11,502/year, reducing annual portfolio withdrawals to around £18,500.
What withdrawal rate should I use for early retirement?
3–3.5% for retirement before 50 (40–50+ year runway), 3.5–4% for retirement at 50–55, and 4% for retirement at 60. The UK State Pension acts as a safety net from 67, making UK early retirement more sustainable than US equivalents at the same withdrawal rate.
This calculator is for illustrative purposes only and does not constitute financial advice. Safe withdrawal rates are based on historical data and past performance does not guarantee future results. State Pension figures are for 2025/26 and are subject to change. Pension access ages are subject to change. For advice specific to your circumstances, consult a qualified financial adviser regulated by the FCA.
Related Calculators
- UK FIRE Number Calculator — your personalised FIRE number with State Pension
- UK Savings Rate Calculator — how your savings rate affects your timeline
- Safe Withdrawal Rate Calculator — model different withdrawal strategies
- UK State Pension Calculator — estimate your entitlement and qualifying years
- Coast FIRE Calculator UK — find out if you can already stop saving
- All UK FIRE Calculators
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