Apply for an Inheritance Tax reference (IHT422)
Apply for an Inheritance Tax reference number before sending in form IHT400 and paying your tax.
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If you owe Inheritance Tax, use this form to request an Inheritance Tax reference number before sending in form IHT400.
Before you start filling in the form
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Updates to this page
Published 4 April 2014Last updated 7 October 2022 + show all updates
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The form has been updated to say we no longer issue payslips and that you should send cheques separate from any forms or letters you send to HMRC.
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The Inheritance Tax return address has been updated and the 'Tell us who is applying' section has been removed.
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A Welsh language version of the IHT422 form is now available.
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The IHT422 form has been amended to include the additional Inheritance Tax threshold (sometimes known as the Residence nil rate band or RNRB).
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IHT422 updated attachment replaced on the page.
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First published.