The long-term resident test decides the answer
Whether your foreign property is caught depends entirely on your UK residence history. Under the residence-based IHT rules in force from 6 April 2025, HMRC counts your UK tax-resident years in the 20 tax years before the chargeable event (death or a chargeable transfer). Hit 10 or more and you are a long-term UK resident, so your whole worldwide estate, foreign property included, is within UK IHT. Fall short and only UK situated assets are in scope. This means new arrivals are broadly outside worldwide UK IHT for roughly their first decade of residence.
The trap: leaving the UK does not free foreign property straight away
Many expats assume becoming non-resident immediately takes their overseas assets out of UK IHT. It does not. If you were a long-term UK resident when you left, a tail of between 3 and 10 years applies: 3 years if you were resident in 13 or fewer of the last 20 tax years, rising by one year for each additional resident year up to a 10-year maximum for someone resident in all 20. During that tail your foreign property remains fully within UK IHT, and another country may tax the same asset at the same time, so check treaty positions.
What to do
Map your residence history year by year under the Statutory Residence Test, because a single mis-counted year can move your long-term resident status, and with it whether foreign property is in or out of scope. Then review the situs of your major assets: which are already chargeable as UK assets, and which only come into charge once you become a long-term resident. The most valuable planning window is before you reach the 10-of-20 threshold, or before a departure tail starts running, so take advice ahead of those crossover points.
