Can executors reclaim overpaid inheritance tax

Yes. If too much inheritance tax has been paid, section 241 of the Inheritance Tax Act 1984 requires HMRC to repay the excess, provided the claim is made within four years of the date the tax, or the last instalment of it, was paid. The repayment carries tax free interest from the date the tax was paid. Executors usually claim through a corrective account on form C4, or through a loss on sale claim if investments or property were sold for less than probate value.

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When does an estate end up overpaying?

Most IHT400 accounts are prepared before every figure is final, and the tax is paid before the grant is issued, so overpayments are common. Typical causes are:

a lower value agreed with the Valuation Office Agency or Shares and Assets Valuation than the executors’ estimate;
debts of the deceased found after the account was filed, such as an income tax bill or a care fee invoice, which can be deducted once they are actually paid out of the estate under section 175A;
quoted shares sold at a loss within twelve months of death, or houses and other real property sold at a loss within four years;
a deed of variation that redirects a gift to a spouse or charity, making more of the estate exempt;
a payment on account that turns out to be larger than the final liability.

HMRC’s guidance at IHTM30435 says claims that a value should be decreased must be dealt with on their merits whether or not a clearance certificate has been issued, so a certificate does not shut out a genuine reduction.

How do executors make the claim?

The route depends on the reason. GOV.UK describes form C4, the corrective account, as the form to send if you have paid too much or too little on the IHT400. It is used for revised valuations, newly discovered debts and assets, and changes following a variation. Losses on sale have their own forms: IHT35 for quoted shares and IHT38 for property, covered in our page on relief for loss on sale after death.

GOV.UK’s page on paying inheritance tax explains that HMRC refunds any excess after probate has been granted, and asks for a letter with the heading shown on that page, which combines the words Repayment and further details, giving the name, number and sort code of the account for the refund. The letter must be signed by the people who signed the IHT400 if they are acting without a solicitor or agent, or if the refund is to go to a different account from the one nominated on the IHT400. An agent asking for payment to the nominated account can sign alone. A deed of variation that reduces the tax is normally sent in with the repayment claim; IHTM35156 notes that the six month delivery rule for variations that increase tax does not apply in that case.

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What is the time limit?

Section 241(1) bars a repayment if the claim is made more than four years after the date on which the payment, or last payment, of the tax was made. Section 241(2) applies the same rule to interest on tax. Where tax is paid by instalments, the clock therefore runs from the final payment, not the first.

IHTM30402 adds two points. The four year limit does not apply where the charge to tax itself rested on an error of fact, such as assuming someone had died when they had not, but an alleged error in valuation is not an error of fact. And there is no repayment where the only reason is a later change in the view of the law; IHTM30451 explains that under section 255, tax assessed on the view of the law generally accepted at the time, and paid and accepted, is not reopened because a later decision shows that view was wrong.

The loss on sale reliefs have their own rules on top. IHTM34011 says a claim for shares must be made within four years of the end of the twelve month period in which qualifying sales can be made.

How much interest does HMRC add?

Section 235 says a repayment of tax or interest carries interest from the date the payment was made until the order for repayment is issued, at the rate set under section 178 of the Finance Act 1989, and that this interest is not income for any tax purpose. Executors do not need to declare it on the estate’s income tax return.

HMRC’s published rate for repayment interest is the Bank of England base rate minus 1%, with a floor of 0.5%. GOV.UK’s inheritance tax interest table shows a repayment rate of 2.75% from 9 January 2026; the rate changes when base rate changes, so check the table for each period the money was held. Our page on HMRC repayments and repayment interest covers the general approach.

Should the estate use a loss on sale claim or a corrective account?

They do different jobs. A corrective account says the original value was wrong at the date of death, or that a deduction or exemption was missed. A loss on sale claim accepts the date of death value was right but substitutes the later sale price. The difference is important because the loss reliefs have conditions of their own. IHTM34011 says the shares relief applies only to qualifying investments sold by the appropriate person within twelve months, and only where there is an overall loss on all qualifying sales, so sales at a gain count against the losses. IHTM33011 says the property relief substitutes the sale price of every interest sold within the four year period once a claim is made, including those sold for more, except sales at a higher price in the fourth year, and that no relief is due where the difference is less than £1,000 or 5% of the value on death, whichever is lower.

So executors should not claim reflexively. Where an asset was simply over valued, a corrective account with valuation evidence may be cleaner than a loss claim that drags in every other sale.

How might a claim look?

Illustration only. The executors of an estate paid £120,000 of inheritance tax on 1 March 2026, all at 40%. Afterwards:

HMRC’s valuer agrees the house at £20,000 less than the executors’ estimate; and
the executors find and pay a £5,000 income tax bill of the deceased.

The chargeable estate falls by £25,000, so the tax falls by £10,000. The executors file a C4 with the valuation agreement and the paid tax bill, and send a signed repayment letter. If the repayment order is issued on 1 October 2026 and the repayment rate stayed at 2.75% throughout, interest for the 214 days is roughly £161, paid tax free with the £10,000.

What if the changes increase the tax instead?

The same events can work the other way. IHTM10701 says a corrective account is strictly due within six months of discovering that the original account was incorrect, and additional tax carries late payment interest. IHTM40147 confirms that a clearance certificate does not stop HMRC collecting additional tax arising from variations, disclaimers and the other reading back provisions in sections 142 to 145.

What mistakes come up most often?

Letting the four year window pass while waiting for the administration to finish.
Assuming a clearance certificate prevents a repayment claim.
Claiming a deduction for a debt that is never actually paid out of the estate.
Making a loss on sale claim without including every qualifying sale in the period.
Sending a repayment letter signed by the wrong people, which delays payment.
Forgetting that the interest HMRC adds is not taxable income of the estate.

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Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 24 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.