Calculator
P2P income calculator
A target rate looks great until you account for the loans that don't pay. Enter an amount, a rate and an assumption for bad debt to see a more honest picture of the income you might keep.
Last reviewed May 2026 · by Gareth Hoyle
Illustrative income from a P2P ISA
Gross interest / yr
£700
After assumed bad debt / yr
£500
Roughly per month
£42
A simple illustration: net figures assume bad debt reduces your return by the percentage you enter. Real outcomes are lumpier than this, can be worse in a downturn, and your capital is at risk. Tax-free inside an ISA. Illustrative only, not a forecast or advice.
Why the bad-debt input matters
Headline target rates are quoted before defaults. In the real world, some borrowers don't repay, and that bad debt comes straight off your return. Putting in even a modest bad-debt assumption shows why a higher target rate is not the same as a higher guaranteed income. Actual losses are unpredictable and can be far worse in a downturn, and your capital is at risk.
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