How to calculate your FIRE number (and why most people get it wrong)
If you’ve spent any time looking into FIRE (Financial Independence, Retire Early), you’ll have come across a deceptively simple equation. Multiply your annual spending by 25, the formula says, and that’s the size of investment portfolio you need to retire. £30,000 a year of spending becomes a target of £750,000. £40,000 becomes £1 million. Job…