Small changes to widely paid taxes can raise large sums. Higher taxes on asset sales can bring in less if people delay selling. These estimates cannot simply be added together.
United Kingdom · Rate changes: 2027–28 for a change made in April 2026. Compliance: 2029–30. Wealth Tax Commission: 2020 study. · HMRC illustrative economic modelling (OSR questioned the official-statistics label in December 2025); the compliance yield is a government costing; Wealth Tax Commission figures are independent research
Show the workings — Broad taxes can raise billions; an older estimate suggests a large capital gains tax rise could lose money
Estimated additional revenue for specific designs, grouped by kind. Rate and base changes: HMRC ready-reckoner, 2027–28, £bn cash. Each row is a separate illustrative change, not additive, and scales differ between groups.
A point on a broad base — employer National Insurance, VAT or the basic rate of income tax — raises £8–11bn a year. Narrower taxes on the wealthiest raise far less per point, and the HMRC estimate for a 10-point rise in the higher capital gains rate is negative, because people delay or avoid selling assets. No range is published for these figures, so none is shown. Rows cannot be added: several changes would interact.
- Geography:
- United Kingdom
- Measure:
- £ billion a year (one-off group: £ billion total)
- Period:
- Rate changes: 2027–28 for a change made in April 2026. Compliance: 2029–30. Wealth Tax Commission: 2020 study.
- Status:
- HMRC illustrative economic modelling (OSR questioned the official-statistics label in December 2025); the compliance yield is a government costing; Wealth Tax Commission figures are independent research
- Calculation:
- HMRC £ million converted to £ billion. No adjustment for overlap; no group total.
- Compare with:
- Total public sector receipts £1,231.3bn in 2025–26
- Not included / breaks:
- June 2025 ready-reckoner uses the Spring Statement 2025 baseline and an April 2026 implementation; these are not newly costed October 2026 policies. Figures are direct effects of small changes and include some behavioural response; large changes cause proportionately larger responses. Pension fund investment is excluded: it is financing capital, not tax revenue. The Energy Profits Levy and Digital Services Tax are excluded because their receipts are already in the forecasts.
Source: HMRC, Direct effects of illustrative tax changes (June 2025) (released 24 June 2025).
View the data as a table
| Group | Design | Estimate | Basis |
|---|
| Collect tax already due | Compliance and debt package (Autumn Budget 2024, extended since) | £10.0bn | Annual, by 2029–30; already in the forecasts |
| Collect tax already due | Further compliance beyond the package | No robust estimate | |
| Change rates or bases | Employer National Insurance +1 percentage point | £11.25bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | VAT standard rate +1 percentage point | £9.20bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | Income tax basic rate +1p | £8.25bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | Employee National Insurance main rate +1 percentage point | £5.30bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | Corporation tax main rate +1 percentage point | £3.90bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | Income tax higher rate +1p | £2.15bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | Income tax additional rate +1p | £0.27bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | Inheritance tax standard rate +1 percentage point | £0.24bn | 2027–28, HMRC ready-reckoner |
| Change rates or bases | Capital gains tax higher rate +10 percentage points | £-2.06bn | 2027–28, HMRC ready-reckoner |
| Property and wealth | Annual wealth tax, 0.6% above £2m (Wealth Tax Commission illustration) | £10.0bn | Per year after administration costs; 2020 study, not an official costing |
| Property and wealth | Annual wealth tax, 2% above £10m | No robust estimate | |
| Property and wealth | Council tax revaluation or reform | No robust estimate | |
| One-off receipts | One-off wealth tax, 1% a year for five years above £500,000 (Wealth Tax Commission) | £260bn total | Total over five years, not per year |
Scroll the table sideways to see every column.