How does a RICS probate valuation affect inheritance tax liabilities?

A RICS probate valuation can change the inheritance tax calculation because the property figure feeds into the estate’s overall value. If the valuation is too high, the reported estate may appear to have a greater tax liability than it should; if it is too low, the estate may understate the amount due and face questions, revised calculations or interest.

The valuation is considered alongside the rest of the estate, including bank accounts, investments, personal possessions, business interests, liabilities and any allowable exemptions or reliefs. It does not, by itself, determine the final inheritance tax bill. The executor or administrator must establish the value of the complete estate and apply the rules relevant to the deceased’s circumstances.

How the property figure affects the estate

The property’s assessed value forms part of the gross estate. Debts and certain permitted liabilities may then be taken into account when calculating the taxable estate. Ownership arrangements also matter. A property owned jointly may need to be valued according to the deceased’s legal interest rather than simply treated as a wholly owned asset. The terms of the ownership, the surviving owner’s position and the applicable tax rules should therefore be checked before the valuation is included in the return.

Where the estate includes more than one property, each interest should be considered separately. Factors such as occupancy, tenancy arrangements, development potential, restrictions on use and the condition of the building may affect the figure. A RICS valuer should explain the assumptions and evidence supporting the assessment so that the executor has a clear audit trail.

Why accuracy and supporting evidence matter

HM Revenue and Customs may examine the figures submitted for an estate, particularly where a property is unusual, has significant development potential, is in poor condition or has been subject to a substantial change in value. A properly reasoned report provides more than an informal opinion: it records the valuation date, the basis of assessment, relevant comparable evidence, property details, assumptions and any limitations affecting the conclusion.

The report should be retained with the estate records, together with information such as photographs, title documents, plans, tenancy details and correspondence about defects or restrictions. This evidence can help demonstrate why the reported figure was reasonable if the valuation is queried.

Valuation issues that can affect inheritance tax

• Condition: structural defects, subsidence, damp, asbestos, Japanese knotweed or significant repair requirements may reduce the market value, provided they are properly evidenced.
• Occupancy: a vacant property, an existing tenancy or rights granted to another person can produce different valuation assumptions.
• Planning and development: planning permission, potential for conversion or additional building land may increase value, while planning restrictions can limit it.
• Legal matters: disputes over boundaries, title defects, access rights or restrictive covenants may affect marketability and price.
• Market conditions: the valuer must consider evidence relevant to the valuation date rather than relying only on a later sale price.
• Partial ownership: the value of a share in a property may not be identical to the value of the whole property, depending on the ownership structure and applicable valuation principles.

A later sale can provide useful evidence, but it does not automatically replace the original assessment. The sale may take place in different market conditions, after repairs or improvements, or following a change in the property’s circumstances. The reasons for any difference should be examined rather than assuming that the eventual sale price was the correct figure for the earlier estate valuation.

Interaction with reliefs and exemptions

The property value can affect whether the estate falls within the scope of inheritance tax and how much of any available allowance or relief is used. The treatment may differ where the property was a main residence, was transferred to certain beneficiaries, formed part of a trust or was connected with business or agricultural assets. Eligibility depends on the detailed facts and current legislation, so a valuation report should not be treated as confirmation that a relief applies.

Executors should give the valuer complete information about the property’s ownership, use and history. Omitting a tenancy, planning proposal, co-owner, trust arrangement or known defect may lead to an unsupported conclusion and an inaccurate tax return.

What happens if the figure changes?

If better evidence becomes available, or the valuer identifies an error, the estate may need to review the information already submitted. The appropriate correction process depends on the nature of the change, the stage reached in the administration and the relevant HMRC procedures. Executors should keep a written record of the reason for any amendment and obtain tax advice where the change could affect the amount payable.

Inheritance tax and capital gains tax are separate matters. A probate valuation supports the estate’s valuation for inheritance tax, while a later disposal may create a separate capital gains tax calculation using the relevant acquisition value and disposal circumstances. The probate report should therefore be preserved for both record-keeping and any later professional review, without assuming that the two taxes are calculated in the same way.

For a complex estate, the valuer’s report should be considered alongside advice from a suitably qualified inheritance tax professional. The valuer establishes the property evidence; the executor and tax adviser apply that evidence to the estate accounts, reliefs, exemptions and reporting requirements.