Barista FIRE calculator

How Barista FIRE actually works

Barista number = (spending − part-time wage) ÷ withdrawal rate. Earn £15,000 from an easy twenty-hour week against £30,000 of spending and the pot only has to produce the other £15,000, so the target falls to half of full FIRE. That's the version in every blog post, and it's the seductive half of the story. The name comes from Americans taking coffee-shop jobs for the health insurance; the UK version has no such anchor, which makes it purer: the wage is simply a way of shrinking what the pot must do, years before it could do everything.

Why this calculator gives a later age than the blogs

Reaching the Barista number is not the same as the plan working. From the day you go part-time the pot is being drawn on, so it compounds at a crawl, and the day the wage stops you need the full FIRE number after all. A pot that scraped to the Barista line at 49 and then spent eleven years being milked can arrive at 60 nowhere near the full target. This page simulates both phases and reports the earliest switch age where the whole journey survives, which on the default numbers is years later than the naive answer. The gap between the two ages is the honest price of the semi-retired decade, and seeing it is the point of the tool.

Three UK rules that reward the part-time route

First, the bridge: before pensions open at 57, the pot's share of your bills can only come from ISAs and accessible savings, so the shape of your wealth matters as much as its size, and the calculator tests it. Second, the State Pension: a part-time job paying above £6,708 a year keeps clocking up qualifying years towards the 35 needed for the full amount, so the barista years protect a benefit that full early retirement quietly erodes. Third, the tax trap to sidestep: flexibly drawing taxable pension money while still contributing triggers the Money Purchase Annual Allowance, capping all future pension saving at £10,000 a year with no way back. Fund the part-time years from ISAs and the trap never springs. A part-time wage around the £12,570 Personal Allowance is also close to tax-free, which is why £15,000 gross of barista income buys almost £15,000 of groceries.

Where this fits among the FIRE tools

If the question is the full stop rather than the wind-down, the FIRE calculator finds your number and age, and if the question is when saving becomes optional it's the Coast FIRE calculator. The rate you withdraw at matters across all of them, and the volatility drag calculator shows why bumpy returns make cautious rates wise. For the full retirement picture with the State Pension folded in, finish with the retirement age calculator.