Free landlord disclosure tool
Estimate undeclared rental profit, income tax, late-payment interest and a possible HMRC penalty range. Add each tax year separately.
Enter total rent and allowable revenue expenses. Enter other taxable income before rental profit.
Behaviour is a technical conclusion, not simply an admission. If unsure, select the cautious answer and obtain advice before notifying HMRC.
| Year | Profit | Tax | Interest | Penalty range | Total range |
|---|---|---|---|---|---|
| 2023/24 | £0 | £0 | £0 | £0–£0 | £0–£0 |
The tool estimates rental profit as gross rent less entered expenses, then applies simplified UK income-tax bands to the marginal profit. Interest runs from an approximate Self Assessment due date to today. The penalty band uses HMRC’s domestic failure-to-notify ranges for behaviour and prompted status.
This is a conversation estimate, not a figure to submit. Historic tax rates, ownership, mortgage interest, losses, allowances and the quality of disclosure need a year-by-year professional calculation.
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