A HMRC warning has been issued as thousands of UK households "may not realise" you have to pay a certain tax.
The Labour Party government's tax arm says people need to plan several years to avoid paying a hefty tax bill.
The standard Inheritance Tax rate is 40%. It’s only charged on the part of your estate that’s above the threshold.
Here is an example: Your estate is worth £500,000 and your tax-free threshold is £325,000. The Inheritance Tax charged will be 40% of £175,000 (£500,000 minus £325,000).
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Lorraine Wilson, principal associate in the private wealth team at national law firm Weightmans, warned that ever more people are being dragged into paying the tax "without realising it".
Ms Wilson said: "Someone giving away assets late in life may not realise that gifts made within seven years of death can still be taxed."
Ms Wilson said it is important to take "early action" to get your estate in order and think about your inheritance tax liability.
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"For those whose wealth is tied up in property or investments, there are structured options like trusts or family investment companies.
"These can help you pass wealth down the generations while keeping some flexibility."
Last year, HMRC collected a record £7.5 billion from IHT. That figure is expected to grow, especially as more people are pulled into the tax bracket simply because of rising property values.
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