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HMRC Inheritance Tax Probes Surge by 31% as Revenue Hits Record £8.2 Billion

Over 2,600 investigations remain open, with rising interest rates and upcoming pension tax changes set to broaden the tax base by 2027.

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More families are being investigated by HMRC on IHT underpayments 
(shapecharge/Getty)
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Overview

  • HMRC launched 3,961 inheritance tax investigations in the year to April 2025, a 31% increase compared to the previous year.
  • The tax authority has conducted nearly 10,000 inheritance tax inquiries over the past three years, with 2,606 cases still unresolved.
  • Inheritance tax revenues reached a record £8.2 billion in the latest fiscal year, marking the fourth consecutive year of record-breaking collections.
  • The interest rate on overdue inheritance tax payments stands at 8.5%, the highest in 18 years, compounding financial challenges for grieving families.
  • From 2027, private pensions will be included in estates for inheritance tax purposes, increasing the number of taxable estates by nearly 25%.