If you're an individual responsible for managing the estate of a loved one who recently passed away, you know that there are various legal and financial matters that need to be taken care of. One of these crucial tasks is submitting the Inheritance Tax (IHT) form 400 to HMRC, the UK's tax and customs authority. In this comprehensive guide, we'll provide you with detailed information about where to submit your IHT400, ensuring a smooth and timely process.

Who Should Submit the IHT400?

Generally, the legal personal representative (executor or administrator) of the deceased individual's estate is responsible for submitting the IHT400. This individual is tasked with managing the administration of the estate, including paying debts, distributing assets to beneficiaries, and filing the necessary tax forms.

When Should the IHT400 be Submitted?

The IHT400 must be submitted to HMRC within six months of the Grant of Representation being issued. The Grant of Representation is a legal document confirming the authority of the personal representative to handle the estate. However, in specific circumstances, an extension may be granted, but you must request this in writing before the six-month deadline expires.

Completing the IHT400

The IHT400 form comprises several sections that require detailed information about the deceased individual, their estate, and any potential Inheritance Tax liability. Before you begin filling out the form, ensure you have gathered all the necessary information, including:

  • The deceased individual's name, date of death, and National Insurance number
  • Details of the deceased's assets, including property, savings, investments, and personal belongings
  • Information about any debts or liabilities owed by the estate
  • Details of any lifetime gifts made by the deceased individual within the past seven years
  • Information about any inheritance tax exemptions or reliefs that may apply

Where to Submit the IHT400

Once you have completed the IHT400 form, you must submit it to the correct HMRC office. The location of the submission will depend on the deceased individual's domicile at the time of death.

  • England and Wales: HM Revenue and Customs, Inheritance Tax Unit, St. John's House, Merton Road, Bootle, L23 9GJ
  • Scotland: HM Revenue and Customs, Inheritance Tax Unit, 31 Waterloo Place, Edinburgh, EH1 3EG
  • Northern Ireland: HM Revenue and Customs, Inheritance Tax Unit, Clarendon House, 109-117 Chichester Street, Belfast, BT1 4JH

Additional Information and Resources

For more detailed guidance on completing and submitting the IHT400, you can refer to the following resources:


Submitting the IHT400 is a crucial step in the administration of an estate. By carefully gathering the required information, completing the form accurately, and submitting it to the appropriate HMRC office within the specified timeframe, you can ensure a smooth and timely process for settling the Inheritance Tax liability.

Frequently Asked Questions

  1. What happens if I miss the six-month deadline for submitting the IHT400?

You may request an extension in writing before the deadline expires. However, HMRC may impose a penalty if you submit the form late without a reasonable excuse.

  1. Can I submit the IHT400 online?

Currently, the IHT400 form cannot be submitted online. It must be printed, filled out, and sent by post to the appropriate HMRC office.

  1. What are the consequences of not filing the IHT400?

Failure to submit the IHT400 within the specified timeframe may result in penalties and interest charges on any unpaid taxes.

  1. Who should I contact if I have questions about completing the IHT400?

You can contact HMRC's Inheritance Tax helpline at 0300 123 1072 for assistance with completing the IHT400 form.

  1. How long does it take to process the IHT400 form?

The processing time for the IHT400 form typically takes around 20 working days. However, this timeframe may vary depending on the complexity of the estate and the workload at HMRC.

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