For high-net-worth South Africans with property, family, or financial interests in the United Kingdom, it’s crucial to understand how UK inheritance and gift tax laws may affect your wealth across generations. While South Africa does not currently impose inheritance tax (instead relying on estate duty), the UK system is more complex and can catch non-residents off guard.

1. UK Inheritance Tax: An Overview

UK Inheritance Tax (IHT) is charged at 40% on estates over the tax-free threshold, known as the nil-rate band, which is currently £325,000 (as of 2025). An additional £175,000 residence nil-rate band may apply if a home is passed to direct descendants.

Unlike South Africa, where estate duty is based on tax residency and worldwide assets, UK IHT is primarily based on domicile. This legal concept is broader and more enduring than tax residency.

2. Domicile and Its Impact

A South African who lives or invests in the UK may become deemed domiciled for IHT purposes. This can happen in two main ways:

Long-term UK residence: You’re deemed domiciled if you’ve been resident in the UK for at least 15 out of the last 20 tax years.

Intention to remain: Even without 15 years of residency, HMRC may consider someone domiciled if they show a long-term intent to remain in the UK or if they have settled family roots there.

Once deemed domiciled, your entire worldwide estate becomes subject to UK inheritance tax.

3. Gifts and the 7-Year Rule

UK tax law includes gift tax provisions under the IHT regime:

Gifts made more than 7 years before death are generally tax-free.

Gifts within 7 years of death may be taxed on a sliding scale (taper relief), depending on when the gift was made.

Certain gifts (to trusts, for example) can trigger immediate charges, even if the donor is alive.

For South African families funding UK-based children, property purchases or trust structures may inadvertently trigger these tax traps.

4. Trusts Are Not a Simple Solution

Trusts have long been used to protect assets and plan for succession. However, UK rules changed significantly in 2006, and many trusts are now subject to:

Entry charges (20% of the value transferred into trust if above the nil-rate band)

Periodic charges every 10 years

Exit charges when assets leave the trust

If a South African settlor is deemed domiciled in the UK, even foreign trusts may not offer protection from IHT.

5. Double Taxation Risk

There is no double taxation treaty between the UK and South Africa specifically covering inheritance tax. This means:

You could face South African estate duty (20%–25%) and UK IHT (up to 40%) on the same assets.

Relief may be available under unilateral tax credit provisions, but planning is essential.

6. Planning Considerations

Here are some steps wealthy South Africans with UK exposure should consider:

Clarify your domicile status: This is a legal question that may require professional advice, not just a tax residence certificate.

Use of exemptions: Spouses domiciled in the UK can receive unlimited tax-free transfers; non-domiciled spouses have limits unless they elect to be treated as UK domiciled.

Life insurance: Policies structured through trusts can provide liquidity to pay IHT liabilities.

Consider gifting strategies early, while outside the 7-year window.

Review trust structures to ensure they remain tax efficient.

The bottom line

For South Africans with international families, property in the UK, or children studying or settling abroad, understanding UK inheritance and gift tax rules is essential. What appears to be a generous gift, or a sound succession plan may lead to an unexpected tax bill if UK IHT is not considered. Professional cross-border estate planning, with awareness of UK domicile rules and gifting consequences, can help protect intergenerational wealth and avoid unnecessary tax leakage.