Coast FIRE in the UK

The short answer

Coast FIRE in the UK means having enough in your pensions and ISAs that growth alone will reach your retirement target, so you can stop saving and just cover today's bills. The State Pension lowers that target, but it starts late, at 67 or 68 for most people under 60 today, so a UK plan usually needs a bridge to cover the years before it arrives.

There's a second gap too. Private pensions can't usually be touched until 55, rising to 57 from April 2028. If you want to stop work earlier than that, the first years have to come from ISAs or other accounts. In our example, assuming the full State Pension from 68, counting it with a bridge moves the coast date from age 52 to age 45. That date is still a roughly 50/50 point based on average returns.

If Coast FIRE is new to you, read what Coast FIRE is first.

ISAs, workplace pensions and SIPPs

The Coast FIRE calculator treats all your investments as one pot, so add up everything meant for retirement. The main UK options compare like this for the 2026/27 tax year:

The ISA allowance is £20,000 for 2026/27, and you can take money out at any time without losing the tax benefits. From 6 April 2027, the cash ISA limit drops to £12,000 for people under 65. That matters less for a Coast FIRE portfolio, which is usually invested in stocks and shares.

Pensions get tax relief instead. With a workplace pension, part of your pay goes in automatically and your employer usually adds more. With a personal pension or SIPP, your provider adds basic-rate relief of 20%, and higher-rate taxpayers can claim the rest through Self Assessment. Relief is limited to 100% of your earnings and an annual allowance of £60,000. Once you start taking money flexibly from a defined contribution pension, a lower money purchase annual allowance of £10,000 applies to further contributions, which matters if you plan to draw on a pension while still working part-time.

When you draw a pension, you can usually take 25% tax-free, up to £268,275 in total. The rest is taxed as income. So if much of your retirement money will come from pensions, enter spending that includes the Income Tax you expect to pay. ISA withdrawals need no such adjustment.

Which to fill first is a personal choice. Pensions usually win on tax relief and employer money, and once you coast, many people keep contributing at least enough to collect any employer contribution, since it's part of their pay. ISAs win on flexibility. If you plan to stop work before 57, you'll need some of both.

When you can reach your money

Two ages shape every UK early-retirement plan:

• Normal minimum pension age. This is the earliest you can usually draw a private pension. It's 55 today and rises to 57 on 6 April 2028. Some members of older schemes keep a lower "protected pension age", so check with your provider.
• State Pension age. According to the official timetable, it's rising from 66 to 67. People born between 6 April 1960 and 5 March 1961 reach it at 66 plus 1 to 11 months, which means the rise is happening between 2026 and 2028. Anyone born from 6 March 1961 has a State Pension age of 67.

Under current law, it rises again to 68 for people born on or after 6 April 1978, with the change phased in between 2044 and 2046 for those born in the year before. The government says the timetable could change after a future review. If you're in your 30s or 40s, it's safer to plan on 68.

The State Pension

The full new State Pension is £241.30 a week for 2026/27, or about £12,548 a year. It rose 4.8% in April 2026, in line with average earnings. Because it rises over time, you can treat today's amount as a figure in today's money.

Qualifying years come from working and paying National Insurance, or from credits. You need at least 10 qualifying years to get anything, and usually 35 for the full rate. Retiring early can leave gaps. You may be able to fill them with voluntary National Insurance contributions, and you can defer your State Pension to increase it.

The best starting point is your own State Pension forecast. It shows how much you're on track for, your State Pension age, and whether you can fill any gaps.

Why UK plans need a bridge

Picture your retirement as three stages. If you stop work at 55 and your pension age is 57 and your State Pension age is 68:

Two bridges come out of this. The access bridge is the money you need outside pensions to get from your retirement date to your pension access age. If you retire at or after 57, you don't need one. The State Pension bridge covers the share of spending the State Pension will eventually pay, for the years before it starts. You can hold it in pensions or ISAs, as long as you can reach it when you need it.

This is why UK FIRE plans often lean on ISAs early. Pensions give you tax relief, but money you need before 57 has to sit somewhere you can reach.

How to fold the State Pension into your number

Split your target in two:

The long-term pot pays, for life, the part of your spending the State Pension never covers, using the 4% rule or a lower rate if you prefer. The bridge fills the gap until the State Pension starts.

Note that the bridge is just the State Pension multiplied by the years, with no growth assumed. That is only conservative if the money stays invested and earns a positive real return. Invested money can also fall just as you start drawing on it, and a bad first few years does lasting damage (see sequence of returns risk). If you park the bridge in cash or short-dated gilts instead, expect it to do little more than hold its value after inflation: the face value is then the amount you need, with no spare.

To use the calculator, which has one retirement age and one spending figure, enter target × withdrawal rate as your spending. At 4%, that's target × 0.04. Treat this as a workaround rather than a full model: the chart shows the right target, but the "retire 2 years later" what-if and the success odds don't recalculate the bridge for a different retirement age. Work out a new target and enter it yourself instead.

If you plan to stop before your pension access age, check the access bridge separately. Multiply your full yearly spending by the number of years before 57: that much needs to sit in ISAs or other accessible accounts on the day you stop. It doesn't change your total target, only where the money has to be. Someone stopping at 50 on £30,000 a year would need £210,000 outside pensions, which takes years of ISA saving to build, so it's worth planning early.

A worked example in pounds

Sam is 35 and wants to stop work at 55. Sam has £100,000 across a workplace pension, a SIPP and a stocks and shares ISA, and puts in £1,500 a month including employer contributions and tax relief. Sam expects to spend £30,000 a year, including tax. We use our defaults: a 7% return, no fees, 2.5% inflation (a little above the Bank of England's 2% target) and a 4% withdrawal rate, for a real return of 4.39% a year.

Sam started work at 20, so by 55 will have 35 qualifying years and expects the full State Pension of about £12,548 a year from a State Pension age of 68. Sam's pension access age is 57.

The bridge version: £30,000 − £12,548 leaves £17,452 a year, which needs £436,310 at 4%. Thirteen years of State Pension adds a £163,119 bridge, for a target of £599,429. In the calculator, Sam enters £23,977 of spending (4% of the target).

Within that target, Sam needs at least £60,000 in ISAs or other accessible accounts at 55, to cover two years of full spending before the pensions open at 57. Everything else can stay in pensions.

Ignoring the State Pension would keep Sam saving until 52, three years short of stopping work altogether. Pretending it starts at 55 would say Sam could coast at 40, with a 13-year hole. The bridge puts the coast date at 45.

Across 1,000 simulated markets, the bridge plan reaches its target by 55 in 51% of them if Sam stops saving exactly on the coast date, 59% with 3 more years of saving, and 72% if Sam never stops. Stopping work at 57 instead, when the pensions open, would need £574,334 and bring the coast date forward to 8 years 2 months from now, at age 43.

How sensitive is Sam's plan?

Changing one assumption at a time shows which ones matter most:

A year's difference in State Pension age moves the date by six months. A more cautious withdrawal rate, or a smaller State Pension because of gaps in your record, moves it by two and a half to three years. That's why your forecast and your withdrawal rate deserve more attention than the exact pension age.

The currency menu changes the symbol and formatting only. Enter every amount in pounds; nothing is converted.

Before you rely on the number

• Check your forecast. Use your real State Pension forecast and age, not the full rate, and look for gaps in your National Insurance record.
• Plan on 57, not 55, for pension access unless your scheme confirms a protected pension age.
• Include tax. Pension income above the tax-free part is taxed, so gross up the share of spending it pays for.
• Hold the access bridge in ISAs. Work out how many years you'll need before 57 and make sure enough sits outside pensions.
• Use a cautious withdrawal rate for a long retirement. Our 4% rule guide explains why many early retirees use 3.5% or less.
• Recheck every year. See what to do after you reach Coast FIRE.

The Coast FIRE number calculator shows how much you'd need at every age. Planning elsewhere? See our guides to Coast FIRE in Canada and Social Security and FIRE.

Sources

Sam's results are our own calculations, explained on our methodology page. Rules and amounts come from official UK sources, checked in October 2026:

1. Individual Savings Accounts (ISAs). GOV.UK. The ISA allowance is £20,000 for the 2026 to 2027 tax year.
2. Individual Savings Accounts: Withdrawing your money. GOV.UK. You can take money out of an ISA at any time without losing the tax benefits (Lifetime ISAs have their own rules).
3. Reduction in the cash Individual Savings Account (ISA) limit. HM Revenue & Customs, 2026. The cash ISA limit falls to £12,000 for people under 65 from 6 April 2027.
4. Workplace pensions. GOV.UK.
5. Tax on your private pension contributions: Tax relief. GOV.UK. Relief at the basic 20% rate is added by your provider; higher-rate taxpayers claim the rest.
6. Tax on your private pension contributions: Annual allowance. GOV.UK. £60,000 for the current tax year.
7. Pensions Tax Manual PTM056510: Money purchase annual allowance. HM Revenue & Customs. The money purchase annual allowance is £10,000 from the 2023 to 2024 tax year, triggered by flexibly accessing a money purchase pension.
8. Tax when you get a pension: What's tax-free. GOV.UK. Usually 25% of a pension can be taken tax-free, up to £268,275.
9. Increasing normal minimum pension age. HM Revenue & Customs. The normal minimum pension age rises from 55 to 57 on 6 April 2028.
10. State Pension age timetable. Department for Work and Pensions.
11. The new State Pension: What you'll get. GOV.UK. The full new State Pension is £241.30 a week; 35 qualifying years are usually needed for the full rate.
12. Over 12 million pensioners to receive £575 State Pension boost. Department for Work and Pensions, 2026. The full new State Pension rose 4.8% in April 2026, in line with average earnings.
13. The new State Pension: Eligibility. GOV.UK. You need at least 10 qualifying years to get any new State Pension.
14. Voluntary National Insurance. GOV.UK.
15. Delay (defer) your State Pension. GOV.UK. Your pension rises by 1% for every 9 weeks you defer, just under 5.8% a year.
16. Check your State Pension forecast. GOV.UK.
17. Inflation and the 2% target. Bank of England.
18. Determining Withdrawal Rates Using Historical Data. William P. Bengen, Journal of Financial Planning, 1994. The original 4% rule: a 4% first-year withdrawal, raised each year with inflation, lasted at least 30 years in every historical US period studied.