08/07/2026
Reducing can be legitimate, but only with real evidence of a sustained drop in income.
If you’re thinking of reducing your Payment on Account, here's what to weigh up 👇
When reducing is fine:
- Losing a major client and income is substantially lower
- Moving from self-employed to PAYE employment
- Taking a sabbatical or extended unpaid leave
- A significant part of the business has stopped trading
When it isn't:
- "Business is a bit quieter"
- "I had a bad quarter"
- Anything based on a forecast rather than figures
Reducing your payment too much means HMRC will charge interest at around 7.75% on the shortfall. Underpaying both instalments by £5,000 equates to roughly £581 in interest, with the deferred tax still coming in January on top.
The golden rule is to never reduce based on a guess. Use actual figures to project the full year and stay conservative. If you think income is down £80,000, project £75,000, so if you're wrong, you're wrong on the safe side.
By July you have far better data than you did in January. Give your accountant your trading figures and the decision can be based on real numbers.
We’re happy to review your position before you submit, drop us an email at [email protected].