The maths: £728 a year extra for every year you wait
The new state pension deferral gives you 1% extra for every 9 weeks you delay claiming. Over a full year, that's approximately 5.8%.
On the current full pension of £241.30 per week, that's roughly £14 extra per week — or £728 per year — added to your pension permanently. Defer for two years and you're looking at £1,456 per year extra, every year, for the rest of your life. Three years? £2,184.
The break-even point is roughly 17 years after you start claiming. Defer at 67, start claiming at 68, and you're ahead by age 85. Average life expectancy for a 67-year-old in the UK is around 85 for men and 87 for women — so statistically, most people come out ahead. And unlike an annuity purchase, where you hand over a lump sum and hope to live long enough, deferral costs nothing upfront. You're simply choosing when to start drawing income you're already entitled to.
Where else can you get 5.8% guaranteed? The best cash ISAs pay around 4.5%, and those rates are falling as the Bank of England continues cutting. UK gilt yields are around 4.4% — and they're taxable outside an ISA wrapper. Deferral beats both, with zero counterparty risk.