Does UK or US estate tax still reach you in Spain?

Key rules

• UK tail: If you were UK resident for 10 of the last 20 tax years, UK inheritance tax can reach your worldwide assets for 3 to 10 years after you leave.
• UK treaty: Spain and the UK have no inheritance tax treaty in force that removes this exposure.
• US citizens: You stay subject to US estate and gift tax on worldwide assets while living in Spain.
• US exclusion: The US exclusion is US$15 million per person from 2026, with a top rate of 40% above it.
• Spanish tax: Spanish inheritance tax may be creditable against US tax under the US-Spain treaty.

The short answer

Leaving the UK or the US does not switch off estate tax there. If you lived in the UK for long enough, UK inheritance tax can follow your worldwide assets for years after you move. If you are a US citizen, US estate and gift tax follows you for life, wherever you live. Spain's own inheritance tax (ISD) can apply on top.

If you are leaving the UK

Since 6 April 2025, UK inheritance tax depends on residence, not domicile. You count as a "long-term resident" if you were UK resident for at least 10 of the previous 20 tax years. If you are, your worldwide assets stay inside UK inheritance tax after you leave.

How long this lasts depends on how long you lived in the UK:

• 10 years of residence gives a tail of 3 years.
• Each extra year of residence adds 1 year to the tail.
• 20 or more years of residence gives the maximum tail of 10 years.

If you were never a long-term resident, the worldwide reach does not apply to you. Assets located in the UK, such as a UK house, stay chargeable either way.

Spain and the UK have no inheritance tax treaty in force that removes this exposure. Moving does not shorten the tail, and Spanish tax is not cancelled by it. Transitional rules can affect the exact calculation, so confirm your tail with HMRC or a tax adviser before you rely on it.

If you are a US citizen

US estate and gift tax applies to your worldwide assets, including your Spanish home and bank accounts. The unified exclusion is the amount you can pass on tax-free over your lifetime and at death. It is US$15 million per person from 2026, with a top rate of 40% above it. It was US$13.99 million for 2025. The IRS indexes it to inflation, so check the figure for the year of the gift or death.

Gifts matter too:

• The annual gift exclusion was US$19,000 per recipient in 2025.
• A gift above it needs a Form 709 gift tax return. It also uses up part of your lifetime exclusion.
• Gifts to a spouse who is not a US citizen have a separate, higher annual cap, and the marital deduction rules differ.
• An estate above the exclusion files Form 706.

The US-Spain estate tax treaty gives relief from double taxation. Spanish inheritance tax may be creditable against the US tax. A cross-border adviser can show how that works for your family.

What to do

Work through the checklist below to count your UK years and compare your estate with the US limit. Do it before you buy property, make large gifts or write a will in Spain. The FAQ below answers common follow-up questions.

Checklist

• Count how many of the last 20 UK tax years you were UK resident.

• Work out your UK inheritance tax tail: 3 years if you had 10 years of residence, plus 1 year for each extra year, up to 10 years.

• List any UK assets you hold, since they stay chargeable even if you were never a long-term resident.

• Check whether you are a US citizen, since US estate and gift tax then follows your worldwide assets in Spain.

• Compare your total estate with the current US exclusion, US$15 million from 2026.

• File Form 709 for any gift above the annual exclusion to one person, and Form 706 if the estate is above the exclusion.

• Ask a cross-border tax adviser how Spanish inheritance tax can be credited against US tax under the US-Spain estate tax treaty.

Frequently asked questions

How long does UK inheritance tax last after I leave the UK?

It lasts from 3 years to 10 years after you leave, depending on how long you lived in the UK. You count as a long-term resident if you were UK resident for at least 10 of the previous 20 tax years. The tail is 3 years for 10 years of residence and rises by 1 year for each extra year, up to 10 years for 20 or more.

Does Spain's tax treaty with the UK remove UK inheritance tax?

No, Spain and the UK have no inheritance tax treaty in force that removes this exposure. While you are in the tail, your worldwide assets can stay within UK inheritance tax. Ask HMRC or a tax adviser to work out your own tail.

Do I have to report gifts as a US citizen living in Spain?

Yes, you file a Form 709 gift tax return if a gift to one person exceeds the annual exclusion, which was US$19,000 per recipient in 2025.