Completing form IHT100 Inheritance Tax Account

You'll need to complete form IHT100 Inheritance Tax Account if Inheritance Tax is due on assets transferred into or out of a trust. Completion is also required on a trust's ten-year anniversary if the value of the assets is above the Inheritance Tax threshold.

On this page:

When to use the IHT100 form for trusts

You may need to fill in an IHT100 form if:

  • assets are transferred into a trust
  • someone who transferred assets into a trust dies within seven years of making the transfer
  • an 'interest in possession' - where a beneficiary can use or enjoy a trust asset as if it's theirs - comes to an end
  • trustees dispose of or transfer assets out of the trust
  • the trust reaches a ten-year anniversary and has to pay a ten-year anniversary charge
  • a special trust - for example a charitable trust - is no longer entitled to special tax treatment

These are known as 'chargeable lifetime events'. A description of each event as well as exceptions to these rules can be found on pages 5 and 6 of form IHT110 'How to fill in form IHT100' - guidance notes for form IHT100. Follow the IHT100 link below to find this form.

Some trusts don't have to send in an IHT100 form for these events, as long as  they meet the rules around excepted transfers and settlements - usually trusts with a low value. The rules are complicated but you can see them by using the 'Delivery of accounts' link below.

An IHT100 should be completed for each chargeable event. But, to reduce the amount of paperwork involved if the trust has made a lot of distributions, you can aggregate them into the quarters where they occurred and submit an IHT100 for each quarter. This means you would then only submit  four IHT100s a year. Remember that to avoid late account penalties you need to ensure that the earliest chargeable event is reported within the allowable one year period.

IHT100 Inheritance Tax Account, guidance and supplementary pages

Delivery of accounts - excepted estates, transfers and settlements

Delivery of Accounts Excepted Settlements Regulations - website (Opens new window)


Step one - make sure you've got the right pages

In addition to the main IHT100 form, you'll need to fill in a separate 'event form' for every individual chargeable event you're reporting on. There are seven event forms:

  • IHT100a - Gifts and other transfers of value
  • IHT100b - Ending an interest in possession in settled property
  • IHT100c - Assets in a relevant property trust ceasing to be relevant property
  • IHT100d - Discretionary trust ten-year anniversary
  • IHT100e - Assets ceasing to be held on special trusts
  • IHT100f - Cessation of conditional exemption and disposal of trees and underwood
  • IHT100g - Alternatively secured pension chargeable event

You may also need to fill in supplementary (additional) pages for certain types of asset held in the trust, or if the person making a transfer into trust lives overseas.

You can download form IHT100, the event forms, supplementary pages, guidance notes and worksheets for helping you with the Inheritance Tax calculations.

Get form IHT100 Inheritance Tax Account, guidance and supplementary pages

Contact the Probate and Inheritance Tax Helpline

Find out what types of trust do and don't pay Inheritance Tax


Step two - complete the return

The IHT100 return is split into nine parts:

  • Part A - looks at what kind of chargeable event you're reporting - it also prompts you to fill in an event form for each event that you report
  • Part B - covers details about the trust - for example, information about the person who transferred assets into the trust and the tax reference of the trust
  • Part C - covers contact details for the main trustee dealing with the trust's tax affairs, or the professional representative of the trust
  • Parts D, E, F - cover information about the assets themselves and will prompt you to fill in the relevant asset-specific supplementary pages where necessary
  • Parts G, H - cover the Inheritance Tax calculations, which you can choose to do yourself, or ask HM Revenue & Customs (HMRC) to do for you (see section below)
  • Part J - covers contact details for those who will get a payment if too much Inheritance Tax is paid
  • Part K - covers information needed in Disclosure of a tax avoidance scheme  
  • Part L  - is where you sign and declare that, to the best of your knowledge, the information you have given is correct and complete


Step three - calculate the tax

You can either do this yourself at parts G and H of the IHT100 form, or you can ask HMRC to do this for you. If you want HMRC to do the calculation, leave parts G and H blank and go straight to part J.

If you choose to do the calculations yourself, you'll need to use form IHT100WS to help you.

Guidance for completing form IHT100WS can be found in form IHT113. When you're completing the IHT100WS you'll need to enter the number of quarters where tax is chargeable. To make sure that you enter the correct number of quarters you can use the calculator by following the link below.

Once you have your final figures, form IHT100WS will tell you how and where to copy them over to the main IHT100 form.

Inheritance Tax calculations can be complicated and you might want to get professional help with them. See the section below on getting help and advice.

Get form IHT100 Inheritance Tax Account, guidance and supplementary pages

Inheritance Tax quarters calculator for trusts


Step four - submit the return

All completed IHT100 Inheritance Tax Account forms should be sent to the HMRC Trusts & Estates Office in Nottingham.

Find contact details for the Nottingham Trusts & Estates Office


Deadlines, penalties and payments

Trustees have up to one year after a chargeable event to report it to HMRC using the IHT100 form.

However, tax might be due before this time, so it's advisable to act quickly after a chargeable event occurs.

If the chargeable event occurred:

  • on or after 6 April 2014 then tax is due 6 months after the end of the month in which the event occurred
  • before 6 April 2014 use the following table to determine when tax is due
Chargeable event occurs
(before 6 April 2014)
Tax due
January 31 July
February 31 August
March 30 September
1 - 5 April 31 October
6 - 30 April 30 April (next year)
May - October 30 April (next year)
November 31 May (next year)
December 30 June (next year)

The payment methods and penalties for non-payment are the same as for all Inheritance Tax payments. If this is the first time you have had to pay Inheritance Tax on the trust you must get an Inheritance Tax reference number before you pay any tax.

How do I get an Inheritance Tax reference number?

Find out about paying Inheritance Tax


Get professional help for your trust

Understanding trusts can be difficult so you may want to work with a solicitor or tax adviser. Remember though that the trustee is still legally responsible for the trust's tax affairs. You'll find some links below to professional organisations - although not all professionals are registered with them.

If you want HMRC to communicate with your agent or professional representative on Income Tax and Capital Gains Tax matters, you'll need to fill in form 64-8. Follow the link below to find out more about completing form 64-8.If you want HMRC to communicate with your agent or professional representative on Inheritance Tax issues you'll need to enter their details on form IHT100.

Find a solicitor on the Law Society of England and Wales website (Opens new window)

Find a solicitor on the Law Society of Northern Ireland website (Opens new window)

Find a solicitor on the Law Society of Scotland website (Opens new window)

Get help from the Society of Trust and Estate Practitioners - STEP website (Opens new window)

Find out more about completing form 64-8