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Premium Bonds calculator
The prize fund average, beside savings interest.
£
%
Interest is shown before tax.
How it's worked out
Prize fund average: £10,000 at 4.35%£435
Interest: £10,000 at 4.20%, paid on every pound£420
Odds: each £1 Bond has a 21,000 to 1 chance each month (NS&I). £10,000 is about 6 prizes a year, on average6 prizes
With £10,000, in a year
In prizes on average, at 4.35%Tax-free£435
In interest, at 4.20% AER (example)Before tax£420
You could win more, less or nothing; most win less.
4.35% is NS&I's prize fund rate from the September 2026 draw. Rates change.
How it's worked out ›
Prize fund average: £10,000 at 4.35%£435
Interest: £10,000 at 4.20%, paid on every pound£420
Odds: each £1 Bond has a 21,000 to 1 chance each month (NS&I). £10,000 is about 6 prizes a year, on average6 prizes
Next step
Compare easy access accounts ›Interest on every pound, at a known rate.