Inheritance Tax planning: evidence and assumptions

Inheritance Tax planning depends on ownership, family circumstances, gifts and the rules applying at the relevant time. HMRC's overview explains thresholds, exemptions and reliefs; eligibility should be checked against evidence rather than assumed. ^[1]

Build a dated set of assumptions Record asset values, debts, residence history, previous spouse or civil-partner information and lifetime gifts. Identify which reliefs are being considered and the evidence needed for each. A relief applicable to one asset or year may not apply to another.

Separate the estimated liability from the cash available to pay it. Ask how sale delays, business restrictions or policy proceeds could affect funding.

Review reforms at their actual commencement HMRC states that the pension Inheritance Tax reforms apply to deaths on or after 6 April 2027. As at this article's September 2026 review, that commencement is still future. [2]

Coordinate the pension information with the gift history and asset valuations. Request a written explanation of assumptions and review triggers. A calculation based on today's facts is a planning tool, not a promise about the tax treatment of an estate arising years later.

Ask for a calculation that shows its building blocks A useful planning illustration should identify the assets included, the ownership interests used, the liabilities considered and the date of the figures. It should then show which thresholds, exemptions or reliefs are assumed and why. HMRC's overview describes several routes that can affect the result, but their availability depends on the circumstances. Ask the adviser to explain the calculation in terms of your estate rather than supply only a final number. A headline estimate is difficult to review if the family cannot see which facts would change it. [1]

Keep evidence connected with each assumption. This may include earlier estate papers for a deceased spouse or civil partner, ownership documents, business records and gift history. Mark information that has not yet been verified. Do not treat an allowance mentioned in an old advice letter as permanently available in full. The adviser needs to check both the relevant rules and what has happened since that letter was written. A clear evidence list makes it easier to distinguish work still needed from conclusions that have already been supported.

Separate relief eligibility from the description of an asset An asset's everyday description does not establish its tax treatment. A family may call something a trading business, agricultural land or a home, but the relevant conditions require their own analysis. Ask which facts the adviser needs about use, ownership, holding periods, beneficiaries and any associated arrangements. Explain recent transactions or intended changes, including sales, restructuring and gifts. The purpose is to test eligibility under the current rules, not to fit an asset into a favourable category simply because that category appears in a general guide.

Provide the full residence history and overseas connections where relevant. Ask how the rules applying to the relevant date affect the scope of the estate and any foreign property or trust interests. Keep succession and tax questions separate: the law governing who inherits may involve different considerations from the UK tax calculation. If more than one country may charge tax, request an explanation of possible relief and supporting evidence. Do not assume that moving abroad, holding an overseas account or signing a foreign will resolves the UK position by itself.

Show future-law scenarios as future-law scenarios The pension reform is a clear example of why the date matters. HMRC's technical note states that most unused pension funds and death benefits enter the revised Inheritance Tax framework for deaths on or after 6 April 2027, with specified exclusions and conditions. In September 2026, a calculation using that framework is considering a future commencement. Ask the adviser to label the assumed date and benefit treatment explicitly, so a projected illustration is not mistaken for the rules governing an earlier death. [2]

Where a reform is relevant, ask which elements are established and which administrative guidance should be checked again before implementation. Keep the source date with the advice and avoid relying on a headline announcement after more detailed rules have become available. Equally, do not assume that every tax change justifies an immediate transfer or withdrawal. The legal costs, income needs, loss of control and other tax consequences of a proposed step should be considered alongside the potential inheritance effect. The planning objective remains the person's wider financial and family position.

Test who has cash when an obligation falls due Separate the estimated tax exposure from the funds that could be used to meet it. Identify cash in the estate, potential sale proceeds and policies or benefits expected to help, noting the actual recipient and likely process. A business interest may be valuable but subject to sale restrictions; insurance paid to someone else is not automatically estate cash. Ask how timing difficulties could be addressed lawfully and what decisions might be needed. A lower projected liability is not the only measure of a workable estate plan.

Request a written record of the advice, outstanding evidence and events that should trigger recalculation. These may include a major gift, a change in residence, a business transaction, new borrowing or a revised family relationship. Keep previous calculations dated so changes in the result can be explained through changed facts or rules. Review the plan before carrying out an irreversible step, including the effect on your own future needs. The calculation should support a considered decision and later review, rather than operate as a promise about the tax on an estate that may arise many years from now.