IHT Valuation Discounts: Minority, Co-Ownership, and Tenanted Property — What Reduces Your IHT Bill

The open market value of a minority shareholding in an unquoted company is less than the pro rata share of the company's total value. A willing buyer would not pay £250,000 for a 25% stake in a £1m company because: (1) the minority shareholder has no control over dividend policy, management decisions, or winding up; (2) there is no guaranteed exit — the shares cannot be sold easily; (3) the minority is at risk of being squeezed out by the majority. Typical discounts applied in IHT valuations: minority holding of 1-25%: discount of 30-40%; minority of 26-49%: discount of 15-25%. The discount must be supported by a professional valuation from a specialist business valuer and will be the subject of negotiation with HMRC's Shares and Assets Valuation (SAV) team. For companies with statutory pre-emption rights or drag-along/tag-along provisions, the discount may be lower (the minority has some protection).

Where property is jointly owned with an unconnected person (not a spouse, civil partner, or relative), each owner's share is valued at a discount to the notional equal share of the vacant possession value. A willing buyer purchasing a 50% share of a property from a deceased's estate would not pay 50% of the open market value because: they cannot sell the property without the co-owner's agreement; they cannot occupy or let the property without cooperation; and proceedings to force a sale are possible but costly and uncertain. HMRC accepts co-ownership discounts of 10–15% in most cases. Where the co-owner is a connected person (family member, business partner), HMRC may not accept the discount — arguing that a sale of both shares together is the realistic outcome and that the related property valuation rules may apply instead.

Property subject to a tenancy is worth less on the open market than the same property with vacant possession. The discount depends on the type of tenancy: regulated (Rent Act 1977) tenancies command the largest discounts (35-50%) because the tenant has strong security of tenure, below-market rents, and succession rights; assured shorthold tenancies attract smaller discounts (10-20%) because the landlord can recover possession relatively easily; long residential leases at low ground rent command modest discounts reflecting the cost of lease extension. Agricultural tenancies attract significant discounts (but may also qualify for APR, which is separate). HMRC has guidance on tenanted property valuation — professional surveyors should provide a formal valuation report setting out the basis for the tenanted discount claimed.

Where shares have specific restrictions on transfer — for example, articles of association requiring board approval for transfer, pre-emption rights requiring shares to be offered to existing shareholders first, or shareholder agreement lock-up provisions — an additional marketability discount applies on top of the minority discount. The marketability discount reflects the additional time, cost, and uncertainty of finding a buyer and completing a sale where restrictions apply. HMRC's SAV team will review the articles and any shareholder agreement as part of the valuation negotiation.

Farmland let under an agricultural tenancy (whether Rent Act tenancy, Agricultural Holdings Act 1986 tenancy, or Farm Business Tenancy under the Agricultural Tenancies Act 1995) is valued at the tenanted (investment) value rather than the vacant possession value. HMRC accepts that let agricultural land is typically worth 50–70% of vacant possession value (implying a discount of 30–50%). However, APR at 50% may apply to let agricultural property — calculated on the agricultural value (the tenanted value), not the open market value. Understanding both the tenanted discount and the APR rate together is essential for valuing let agricultural estates for IHT.

Does HMRC automatically accept valuation discounts or do you need to negotiate?

HMRC does not automatically accept valuation discounts — they must be claimed and supported by professional evidence. The executors/personal representatives must: (1) obtain a professional valuation from a qualified business valuer (for shares) or RICS-qualified surveyor (for property) that sets out the basis and quantum of the discount being claimed; (2) report the discounted value in the IHT account (IHT400 or IHT205/IHT207); (3) be prepared to defend the valuation in correspondence with HMRC if they challenge the discount. HMRC's Shares and Assets Valuation (SAV) team deals with unquoted share valuations; HMRC's district valuer deals with property. Both will typically query discounts above 25-30% and may seek their own valuation evidence. Negotiation is normal — the final agreed value is between the two parties' positions, not automatically the lower of the two.

Does the related property rule override the minority or co-ownership discount?

Yes — the related property rules in s161 IHTA 1984 can override valuation discounts in certain circumstances. The related property rule applies where property owned by the deceased and property owned by their spouse or civil partner (or by a charity that received a gift from the deceased within 5 years) can be valued together as if they were a single holding. For example: if a husband owns 40% of an unquoted company and his wife owns 20%, the husband's 40% stake is related property — valued on the basis of a combined 60% holding (which commands no minority discount) rather than a 40% minority holding (which does). The related property rule can significantly increase the IHT value of an estate asset. Planning: consider whether rebalancing shareholdings between spouses could improve the IHT position.

Can discounts be claimed on shares listed on AIM?

AIM-quoted shares are valued for IHT at mid-market price (average of the two prices in the Stock Exchange Daily Official List on the date of death, or the quarter-up method, whichever is lower). A marketability discount is not normally applicable to AIM shares — they are publicly traded and have a quoted market price. However, where the deceased held a very large block of AIM shares that could not be sold without moving the market, a discount for a 'block holding' may be available — but this requires specific valuation evidence and is contested. The main IHT relief for AIM shares is BPR (100% if the company is a qualifying trading company and the shares have been held for 2+ years) — not a valuation discount.

How should valuation discounts be handled in the IHT forms?

In IHT400 (and supplementary form IHT411 for listed shares/IHT412 for unlisted shares), the discounted value — not the gross pro rata value — is reported. The valuation report from the professional valuer should be attached or available to HMRC on request. For unquoted shares, form IHT412 requires: description of shares; the basis of valuation; any discount applied and the reasons. For property, form IHT400 and supporting schedules require the address and nature of the tenancy. HMRC's guidance on valuing assets for IHT is in IHTM09000 (property) and IHTM25000 (shares). Professional valuers who regularly deal with HMRC on IHT valuations know the format HMRC expects and can advise on presentation.

Do valuation discounts affect the calculation of BPR or APR?

BPR and APR are applied to the market value of the qualifying property — and where a valuation discount applies, the relief is calculated on the discounted (open market) value. For example: if 30% of an unquoted company is valued at £700,000 after a 30% minority discount (vs a gross value of £1m), BPR at 100% shelters £700,000, not £1m. The discount and the BPR both reduce the IHT chargeable value — they are cumulative benefits. From April 2026, BPR/APR is capped at £2.5m of 100% relief — calculated on the open market value of qualifying property (after any discounts).

Are there any circumstances where HMRC will not accept a discount?

HMRC will dispute or reject discounts where: (1) the related property rules apply — where the deceased and their spouse together hold a controlling or majority interest, no minority discount is appropriate on the combined holding; (2) the co-owner is a connected person and a sale together is the realistic market scenario; (3) the claimed discount is above market norms without adequate professional evidence; (4) the valuation exercise shows that, despite a minority holding, the deceased had effective control through a shareholder agreement, weighted voting rights, or other mechanisms. In all cases, HMRC's challenge is that the open market value must reflect what a willing buyer would actually pay — and if the buyer has effective control or can force a sale, the discount is reduced or eliminated.