Wealth: Taxation
(asked on 23rd January 2026) - View Source
Question to the HM Treasury:
To ask the Chancellor of the Exchequer, how much and what proportion of the wealthy tax gap HMRC attributes to (a) Capital Gains Tax and (b) Inheritance Tax for each financial year from 2017-18 to 2024-25.
Wealthy tax gap estimates are published in Measuring the Tax Gap 2025 for 2005-06 to 2023-24. There are no estimates for 2024-25 at this time, these will be published in future tax gap publications.
We use Income Tax, Capital Gains Tax (CGT) and National Insurance Contributions (NICs) data in our estimate of the Self-Assessment (SA) wealthy tax gap. It is not possible to separately estimate the CGT share within this tax gap. We are therefore unable to provide the details for CGT.
The overall wealthy tax gap, detailed in Chapter 1 Figure 1.4 of MTG25 and Table 1.4 of the online tables, breaks down as follows:
(£ billion) | 2017/18 | 2018/19 | 2019/20 | 2020/21 | 2021/22 | 2022/23 | 2023/24 |
Self-Assessment | 1.43 | 1.35 | 1.34 | 1.23 | 1.67 | 1.78 | 1.95 |
Inheritance Tax | 0.20 | 0.19 | 0.19 | 0.10 | 0.20 | 0.12 | 0.15 |
Stamp Duties | 0.02 | 0.05 | 0.05 | 0.04 | 0.04 | 0.05 | 0.04 |
Net Gap | 1.65 | 1.59 | 1.58 | 1.37 | 1.92 | 1.95 | 2.13 |
Or as a percentage share of the overall wealthy tax gap:
(£ billion) | 2017/18 | 2018/19 | 2019/20 | 2020/21 | 2021/22 | 2022/23 | 2023/24 |
Self-Assessment | 86.7% | 85.0% | 84.7% | 90.0% | 87.2% | 91.6% | 91.3% |
Inheritance Tax | 11.9% | 12.1% | 12.1% | 7.1% | 10.5% | 6.0% | 6.9% |
Stamp Duties | 1.4% | 2.9% | 3.2% | 2.9% | 2.3% | 2.4% | 1.7% |