HMRC figures showed Inheritance Tax (IHT) receipts hit £3.7bn between April and August in the 2025/26 financial year.
This was up £190m, or 5%, on the same period last year, when £3.5bn was collected.
Last year saw a record £8.2bn collected in total.
The Office for Budget Responsibility (OBR) forecast that IHT will bring in £9.1bn for 2025/26 and rise to more than £14bn by 2029/30.
Stephen Lowe, director at retirement specialist Just Group, said: “Today’s IHT figures prove the two certainties in life – death and taxes.
“And with rising asset prices, frozen thresholds and last year’s reforms IHT looks set to deliver a bumper tax take for the fifth year in a row.
“As the Chancellor continues to feel the fiscal pressure, and having ruled out hikes on major taxes, she will want to explore all her options to raise revenue.”
Lowe added: “Given Inheritance Tax targets those who are wealthiest in society it’s entirely possible that it will once more be in the Chancellor’s sights.
“With more estates being subject to Inheritance Tax, and the prospect of further changes to the rules on the horizon, it is important that people keep track of the valuation of their estate, including a recent assessment of their property wealth.
“Estate planning is complex and difficult, so many families may find it beneficial to seek professional financial advice to understand their circumstances, the impact of the IHT regime and their options for minimising tax liabilities.”
