What the IHT100a form means for gifts and trust transfers
The HMRC IHT100a form is used to tell tax authorities about gifts or other transfers of value into a trust, or when inheritance tax may be due. This explainer breaks down what happened, who is affected, and practical next steps in plain language with links to the official sources.
What the form is for
The IHT100a is the HMRC form used to declare that Inheritance Tax (IHT) may be due on a gift or other transfer of value into a trust. The page notes that updates were made over time, including changes in April 2026 to the wording and sections to reflect how payments and certain holdings are described. In short, if you gave money or assets into a trust and you think IHT might apply, this form is part of reporting that to HMRC.
Who is affected
The form affects individuals who have transferred value to a trust, such as gifts or settled property, where inheritance tax could be due. It may involve the person who made the transfer (the donor) and, in some cases, agents acting on their behalf. The page updates indicate changes to how instalment payments are described and how control holdings of certain shares are treated, which can matter if those assets are part of the transfer.
Practical next steps
Next steps for someone who needs to use the form include: 1) determine if a transfer to a trust triggers IHT reporting, 2) gather details of the transfer (dates, asset value, type of asset), 3) check the latest official guidance for how to fill sections about liabilities, exemptions. Reliefs, including any updated sections referenced in recent updates (E11, E12, etc.). 4) if you have an agent, follow the updated instructions for agents. 5) ensure you use the latest version of the IHT100a form in English or Welsh. The official GOV.UK page provides the current versions and explanations of the fields involved.
Limits and questions
The explainer notes that while the form is about reporting IHT on gifts and transfers to a trust, each case can be different depending on asset type and timing. If you are unsure how the IHT rules apply to your situation, consult the official guidance or a tax professional. The GOV.UK page has updates on how to fill in section details such as instalments and control holdings of shares, which may affect the filing.
Which sources did Setup in Bahrain review?
Setup in Bahrain reviewed the following source material before preparing this explanatory article.
The links remain visible so readers can inspect the evidence, compare dates and context, and confirm current requirements with the relevant authority.
- gov.uk — evidence source reviewed for this article.
Information and responsibility notice: This article is general information based on the cited material available when published. It is not legal, tax, immigration, medical, financial, banking, or investment advice; it does not create a professional-client relationship; and it is not a guarantee of outcome, availability, accuracy, or eligibility. Rules, schedules, prices, and third-party information can change. Confirm material decisions with the relevant authority and an appropriately qualified adviser before acting.