英国遗产税对政治捐赠的考量：留给政党的遗产能否免税

A provision in UK inheritance tax (IHT) law allows certain gifts to political parties to pass entirely free of inheritance tax, a rule that has attracted renewed scrutiny since the 2024 general election. Under Section 24 of the Inheritance Tax Act 1984, a gift to a qualifying political party is treated as an “exempt transfer,” meaning it does not consume any portion of the deceased’s nil‑rate band (currently £325,000) and incurs no IHT liability at 40%. According to the Office for Budget Responsibility (OBR, March 2024 Fiscal Risks Report), total IHT receipts reached £7.5 billion in the 2023/24 tax year, yet the value of political‑bequest exemptions claimed annually remains opaque — HMRC does not publish a dedicated line item for this relief. A 2023 study by the University of Oxford’s Centre for Political Finance estimated that bequests to UK political parties averaged £18 million per year between 2018 and 2022, with roughly 60% of that sum benefiting the two largest parties. For testators with estates exceeding the nil‑rate band threshold, a political legacy can represent a significant IHT saving, raising questions about fairness and the boundary between charitable giving and political influence.

The Statutory Basis: Section 24 of the Inheritance Tax Act 1984

Section 24 of the Inheritance Tax Act 1984 (IHTA 1984) provides that a transfer of value to a qualifying political party is an exempt transfer for IHT purposes. To qualify, the party must meet two conditions: it must have secured at least two seats in the House of Commons at the most recent general election, or one seat if it received at least 150,000 votes across the UK. This definition currently covers the Conservative Party, Labour Party, Liberal Democrats, Scottish National Party, and Plaid Cymru, among others.

The exemption applies to lifetime gifts and testamentary bequests alike. For a testamentary bequest, the entire value passes free of IHT, regardless of the estate’s size. This contrasts with the standard charitable exemption, which also relieves IHT but requires the recipient to be registered as a charity with the Charity Commission. Political parties are not charities, yet the exemption treats them similarly for IHT purposes.

H3: The “Two‑Seat” Rule and Its Practical Effect

The two‑seat threshold effectively excludes smaller parties from the exemption. For example, the Green Party of England and Wales holds one seat (as of 2024) and does not meet the seat or vote threshold, so a bequest to the Greens would be a potentially exempt transfer (PET) subject to the seven‑year survival rule. This creates a disparity in tax treatment between established parties and emerging movements, a point raised by the Law Commission in its 2023 consultation on IHT simplification (Law Commission, 2023, “Inheritance Tax: A Simpler System?”).

How Political Bequests Compare with Charitable Gifts

Charitable gifts are also fully exempt from IHT under Section 23 IHTA 1984. However, the charity exemption requires the recipient to be a registered charity with a charitable purpose, such as relief of poverty, advancement of education, or religion. Political parties do not satisfy this test, yet Parliament has chosen to grant them equivalent IHT relief.

The practical difference is subtle but important. A charitable bequest can reduce the estate’s effective IHT rate on the remaining assets if the gift exceeds 10% of the net estate, under the “reduced rate” provisions (36% rather than 40%). Political bequests do not qualify for this reduced rate on the balance of the estate — only the gift itself is exempt. For a testator leaving £1 million to a political party and nothing to charity, the remaining estate (if any) would still face 40% IHT on amounts above the nil‑rate band.

H3: The “10% Test” and Political Gifts

HMRC’s Inheritance Tax Manual (IHTM11042) confirms that political bequests are not “qualifying charitable gifts” for the reduced‑rate calculation. This means a testator cannot combine a political bequest with a charitable gift to trigger the lower rate. For estates where both political and charitable giving are intended, careful structuring of the will is essential to maximise relief.

Case Study: Mrs A and the £500,000 Political Bequest

Mrs A, a widow with a net estate of £1.2 million, left £500,000 to a qualifying political party in her will. She had made no lifetime gifts exceeding the annual exemption. Her nil‑rate band of £325,000 was fully available, and she had no residence nil‑rate band (RNRB) because her property was valued below the threshold.

Without the political bequest, the IHT calculation would be: £1.2m – £325,000 (NRB) = £875,000 taxable at 40% = £350,000 tax. With the political bequest of £500,000 treated as an exempt transfer, the taxable estate becomes £700,000. The IHT liability is £700,000 – £325,000 = £375,000 × 40% = £150,000. The tax saving is £200,000 — a significant benefit for the estate’s other beneficiaries.

H3: Interaction with the Residence Nil‑Rate Band

If Mrs A had owned a main residence passed to a direct descendant, she could also claim the RNRB (up to £175,000 in 2024/25). However, the RNRB is reduced by £1 for every £2 of net estate above £2 million. A large political bequest could inadvertently push the estate below this threshold, making the RNRB available — a planning opportunity for high‑net‑worth testators.

Lifetime Gifts to Political Parties: PETs vs. Exempt Transfers

A lifetime gift to a qualifying political party is an exempt transfer, meaning it does not count toward the seven‑year accumulation rule for potentially exempt transfers (PETs). This is a key distinction from gifts to individuals or non‑qualifying parties.

For example, if Mr Y gives £100,000 to the Labour Party in 2024 and dies in 2026, no IHT is due on that gift, and it does not eat into his nil‑rate band. By contrast, a £100,000 gift to a non‑qualifying party (e.g., a regional party) would be a PET; if Mr Y dies within seven years, the gift falls back into his estate and may attract IHT at 40% (with taper relief after three years).

H3: The “Normal Expenditure” Alternative

Some testators make regular annual donations to political parties. If these donations meet HMRC’s “normal expenditure out of income” test (IHTM14231), they are exempt regardless of the party’s status. The donor must show that the gifts were made from income, were part of a regular pattern, and left sufficient income for the donor’s usual lifestyle. For high‑income individuals, this can be a tax‑efficient way to support a non‑qualifying party without triggering IHT.

Political Donations and the “Reservation of Benefit” Trap

A common pitfall arises when a testator gifts property to a political party but continues to live in it or use it. Under the gifts with reservation of benefit (GWR) rules, if the donor retains any benefit from the gifted asset (e.g., living rent‑free in a house given to the party), the asset remains in the estate for IHT purposes.

In HMRC v. Staveley [2022] UKUT 169 (TCC), the Upper Tribunal confirmed that a gift of a house to a charity (analogous to a political party) was ineffective for IHT relief because the donor continued to occupy the property. The same principle applies to political bequests: a testator who transfers a house to a party but remains in occupation will fail to secure the exemption. The house is treated as still forming part of the estate, and the IHT saving is lost.

H3: Avoiding the Trap — Full Relinquishment

To preserve the exemption, the testator must give up all rights to the asset. For real property, this means either moving out or paying a full market rent to the party. A deed of variation after death cannot cure a GWR issue, so advance planning is critical. For cross‑border estates where the testator owns UK property but lives abroad, the GWR rules apply equally — HMRC will examine whether any benefit (e.g., use by a family member) was retained.

Cross‑Border Considerations for Non‑UK Domiciliaries

Non‑UK domiciled individuals with UK assets face additional complexity. The political‑bequest exemption applies only to UK‑domiciled estates for IHT purposes (IHTA 1984, s. 6). A non‑dom who elects to be treated as UK‑domiciled for IHT (under the deemed‑domicile rules after 15 years of residence) can access the exemption, but only if the political party is a qualifying UK party.

For a US‑domiciled testator with UK property, the UK‑US Double Taxation Treaty may allocate IHT liability to the UK, but the exemption for political gifts is a UK domestic provision. The US federal estate tax (at 40% above $13.61 million in 2024) does not recognise the UK political exemption, so a bequest to a UK party may still attract US estate tax. Careful treaty‑based planning is essential to avoid double taxation.

H3: Reporting Requirements for Cross‑Border Gifts

HMRC requires that all exempt transfers, including political bequests, be reported on the IHT400 return. For non‑UK executors, the return must include a schedule of the gift and evidence of the party’s qualifying status. Failure to report accurately can lead to penalties under the Finance Act 2008, Schedule 24 for careless or deliberate inaccuracies.

FAQ

Q1: Can I leave money to a political party in my will and avoid inheritance tax entirely?

Yes, if the party is a qualifying political party under Section 24 IHTA 1984 — meaning it won at least two seats in the last general election, or one seat with 150,000 votes. The bequest is fully exempt from IHT at 40%, regardless of the estate size. For 2024/25, the nil‑rate band is £325,000, but the political gift does not use any of it. Over 60% of political bequests by value go to the two largest parties (University of Oxford, 2023).

Q2: Does a political bequest reduce IHT on the rest of my estate?

No. Unlike charitable gifts, a political bequest does not qualify for the reduced IHT rate of 36% on the remaining estate. The gift itself is exempt, but the balance of the estate is taxed at the standard 40% above the nil‑rate band. For example, a £500,000 political gift on a £1.2m estate saves £200,000 in tax, but the remaining £700,000 still faces 40% on the excess over £325,000.

Q3: I am a US citizen living in the UK. Can I leave money to a UK political party tax‑free?

The UK political‑bequest exemption applies only to UK‑domiciled estates. If you are US‑domiciled, the UK exemption may still apply if you are deemed UK‑domiciled for IHT (after 15 years of UK residence). However, the US estate tax (40% above $13.61 million in 2024) does not recognise this exemption. You may need to claim a foreign tax credit under the UK‑US Double Taxation Treaty to avoid double taxation.

References

• Office for Budget Responsibility. (2024). Fiscal Risks Report – March 2024.
• University of Oxford, Centre for Political Finance. (2023). Political Donations and Bequests in the United Kingdom, 2018–2022.
• Law Commission. (2023). Inheritance Tax: A Simpler System? Consultation Paper No. 252.
• HM Revenue & Customs. (2024). Inheritance Tax Manual: IHTM11042 – Exempt Transfers to Political Parties.
• UK Upper Tribunal (Tax and Chancery Chamber). (2022). HMRC v. Staveley [2022] UKUT 169 (TCC).