FIRE devotees embrace extreme frugality to retire decades early

Packed lunches, extra layers, hot water bottles and £1m in savings let Katie and Alan Donegan leave work behind. Their story shows why FIRE, the financial independence, retire early movement, is less a budgeting trick than a hard trade-off between comfort now and time later.

What FIRE actually asks of your income

FIRE stands for Financial Independence, Retire Early, and the formula is blunt. Followers try to save roughly 50% to 75% or more of income, then build toward the common 25x rule: save enough to cover 25 years of annual expenses, then draw about 4% a year in retirement. That math can work on paper, but it demands unusually high savings rates for a long stretch, which is why FIRE is usually easiest for people with above-average earnings, low fixed costs, or both.

The movement’s intellectual roots go back more than three decades. Vicki Robin and Joe Dominguez’s *Your Money or Your Life* helped widen interest, and the strategy emerged more broadly in the early 1990s before personal finance books popularised it further in 2010. The core idea has stayed the same: spend less than most people think is comfortable, invest aggressively, and aim to quit before the traditional retirement age.

How the Donegans turned discipline into an exit strategy

Katie and Alan Donegan are the kind of case FIRE advocates point to when they want to make the lifestyle feel real. Alan was 40 and Katie was 35 when they retired, after saving and investing aggressively for years. They said one habit alone, packing lunches for work instead of buying food, left them £40,000 better off over 10 years.

Their frugality went well beyond lunch. They rarely ordered takeaways, avoided turning on the heating in winter by wearing extra layers and using hot water bottles, charged their phones while out, and even hunted for discarded Nectar vouchers.

Why the numbers are harder to copy than the headlines suggest

The attraction of FIRE grows partly because standard retirement is still a long way off for most workers. The average retirement age in the UK last year was 65.8 for men and 64.7 for women, while average retirement ages in the US in 2025 were 64.8 for men and 63.3 for women. Against those benchmarks, retiring at 35 or 40 means creating a gap of roughly two and a half decades, not simply trimming a few discretionary purchases.

That gap is where the hard economics sit. A household saving 50% to 75% of income has far less room for rent or mortgage payments, childcare, transport, and the kind of day-to-day flexibility many families rely on when wages are squeezed or costs rise. FIRE can make sense on a high salary, in a low-cost area, or with an unusually low spending base, but it is far less forgiving for people facing higher housing costs or uneven income.

The trade-offs behind the lifestyle

The movement’s critics usually focus on realism, and they have a point. Some FIRE adherents save by giving up cars, alcohol and children, a level of restraint that is not just about budgeting but about redesigning adulthood itself. The main risks are running out of money, facing health insurance gaps before Medicare eligibility, and feeling unfulfilled after leaving the workforce.

Supporters answer with a different definition of success. They say the payoff is freedom, choice, security and control, not a life of permanent deprivation. Some early retirees push back hard against the stereotype that FIRE means living in a van or surviving on rice and beans.