IHT Related Property Rules: Valuing Family Company Shares Held by Connected Owners

The related property rule in section 161 IHTA 1984 can require an interest in an unquoted family company to be valued together with a qualifying connected owner’s interest before the transferor’s own portion is determined. Its direct owner boundary is spouse or civil partner only; it does not automatically connect parents, adult children, siblings, in-laws or business associates. A separate, conditional limb covers certain charity and specified-body property within the preceding five years.

What the related property rule does

Section 161(1) IHTA 1984 applies where the standalone value of property comprised in a person’s estate is less than the appropriate portion of the aggregate value of that property and related property. In that situation, the value for Inheritance Tax purposes becomes the appropriate portion of the aggregate value.

HMRC describes the policy behind the rule as preventing fragmentation of ownership from reducing value for IHT, with the aim of passing a family estate within the family with the minimum IHT charge. Its example is controlling shareholdings split into minority holdings. HMRC describes the effect as recombining spouses’ or civil partners’ ownerships for valuation purposes. That is a valuation recombination, not a statement that their legal ownership has merged.

The general market-value baseline in section 160 IHTA 1984 is the price which the property might reasonably be expected to fetch if sold in the open market at the relevant time, subject to statutory exceptions. Section 160 also prevents an assumption that the price is reduced merely because the whole property is placed on the market at one and the same time.

Who counts as a connected owner?

For the direct owner connection, section 161(2)(a) IHTA 1984 identifies property in the estate of the person’s spouse or civil partner. No broader family relationship is substituted for that statutory boundary.

Parents, adult children, siblings, in-laws and business associates are therefore not automatically connected owners under the direct owner limb. Their ownership of another family company interest does not, by itself, cause that interest to be aggregated under section 161.

Section 161(2)(b) contains a separate property-based limb. The relevant property must be, or have been within the preceding five years:

property of a charity;
property held on trust for charitable purposes only; or
property of a body specified by the Act.

HMRC summarises the specified bodies as political, national or public bodies to which exempt transfers may be made. The property must have become charity or specified-body property on a transfer of value made by the transferor or the transferor’s spouse or civil partner after 15th April 1976. The transfer must also have been exempt to the extent that the value transferred was attributable to the property.

This limb should not be described as a general connection based on family, friendship or business association. It has its own property, transfer, date and exemption conditions. HMRC will decide what property is to be regarded as related property.

The two-step valuation method

IHT Manual paragraph 15.4 describes a two-step process: establishing the enhanced value of the aggregate and then calculating the appropriate portion attributable to the transferor.

First: establish the enhanced aggregate value

The transferor’s property and the related property must first be valued together, as if already merged. The aggregate must reflect the full enhancement attributable to that merger.

There must be no deduction merely because the related property belongs to the spouse or civil partner rather than the transferor, and no deduction merely because more than one ownership is involved. Where merging the interests would make vacant possession available, the property is to be valued with vacant possession.

For example, any enhancement in value associated with bringing the interests together cannot be removed as a notional “two-owner discount”. Section 160 likewise does not permit an assumed market discount merely because the aggregate is being valued at one time.

Then: calculate the appropriate portion

The transferor’s interest and the related property must also be valued separately for this second step. Each value must be determined as if that property did not form part of the aggregate.

Section 161(3) supplies the general rule. HMRC identifies:

A as the enhanced value of the aggregate;
T as the transferor’s property valued separately; and
R as the related property valued separately.

The general rule attributes to the transferor the portion of A corresponding to the ratio between T and the combined standalone total represented by T and R. In operational form, that is A × T ÷ (T + R).

The general rule and the special rule for shares

The general rule in section 161(3) is used where the items aggregated are different. It works from the separate values of the transferor’s property and the related property.

Section 161(4) supplies a special rule principally for shareholdings and also for undivided shares in property. Where the special rule applies within the same class of shares, the proportion which the value of a smaller number of shares bears to that of a greater number is taken to be the proportion which the smaller number bears to the greater.

The phrase “same class” is itself controlled by section 161(5). Shares are not treated as being of the same class unless they are so treated by the practice of a recognised stock exchange, or would be so treated if dealt with on such an exchange.

This qualification is important for an unquoted family company. Its different classes cannot simply be combined into one undifferentiated share count for the special rule. The class question must be resolved before applying the number-based proportion, and the recognised-stock-exchange practice test is the statutory gateway.

When the rule does not apply

IHT Manual paragraph 15.3 states that the rule does not apply where the value produced by the section 161 apportionment is equal to or less than the transferor’s standalone value.

The connection therefore does not automatically create an uplift. The result of the statutory apportionment must be compared with the transferor’s own standalone value. If there is no enhancement, the related property rule does not replace that standalone figure.

The rules apply both to lifetime transfers and transfers on death. They apply for IHT purposes only; HMRC confirms that there are no equivalent provisions in CGT legislation.

Who values an unquoted family company shareholding?

Shares and Assets Valuation, or SAV, is the HMRC section mainly dealing with the valuation of unquoted shares. The specialist valuation of the shareholding therefore sits with SAV.

Where the value of shares in an unquoted company reflects wholly or substantially the value of underlying freehold or leasehold property, or plant or machinery owned by that company, SAV may refer the underlying assets to the Valuation Office Agency, or VOA.

That division of responsibility is deliberate. VOA values the underlying property, plant or machinery; it does not determine the IHT value of the shareholding itself.

Under IHT Manual paragraph 16.3, the VOA is not required to ascertain the “value transferred” or the “value of the property transferred” because those terms relate to the shareholding, which is a matter for SAV. Paragraph 16.8 also records that, where the property being transferred is the shareholding rather than the company assets, there is no statutory basis in the SAV case for valuing the underlying property as the transferred property.

For related-property cases, IHT Manual paragraph 15.5 directs that the interests should be valued together, as if already merged. In an unquoted-company case, that combined exercise must be read alongside the SAV and VOA division described in Section 16: SAV retains responsibility for the shares, while VOA may value the underlying assets.

IHT Manual paragraph 16.11 requires valuations to be based on open market value, having regard to evidence of open market transactions in similar property in the normal way. Existing and alternative uses are considered to the extent that they are reflected in the price obtainable in the open market.

How secured liabilities enter the valuation

Section 162(4) IHTA 1984 addresses liabilities that are incumbrances on property. It provides that such a liability must, so far as possible and subject to the statutory qualification preserved in that provision, be taken to reduce the value of the property.

Secured lending is therefore relevant where the liability has the required character as an incumbrance on the property being valued. It does not follow that every company debt, shareholder loan or other liability automatically reduces the value of a shareholding.

Any accepted reduction must be tied to the property burdened by the liability and reflected in that property’s value. It is not an unexplained deduction from the aggregate related-property value or a substitute for the section 161 apportionment method.

When to involve a professional adviser

Professional IHT and valuation input is particularly important where a spouse or civil partner holds a different class of unquoted company shares, where aggregation may enhance value, where the company is substantially asset-backed, or where secured lending affects an underlying asset.

A solicitor or tax adviser experienced in IHT should work with the relevant valuation professional to confirm connected-property status, the treatment of each share class, the scope of any VOA asset valuation and the treatment of proposed liability deductions.

This article provides general information on UK Inheritance Tax rules. It is not advice on the valuation or tax position of a particular estate.