Mixed-Use Property and SIPPs: What Are the Rules?

The starting point for any mixed-use SIPP analysis is the residential property prohibition. Under the Finance Act 2004, a registered pension scheme cannot hold residential property. "Residential property" is defined as any building or part of a building that is used or suitable for use as a dwelling. The definition is deliberately broad and is construed strictly by HMRC.

The prohibition applies to the residential element within a mixed-use property, not just to standalone residential buildings. If a SIPP acquires a property that contains a flat, an apartment, or any accommodation that constitutes or could constitute a dwelling, the residential element is a prohibited investment regardless of how small it is relative to the overall property.

The tax consequences of a SIPP holding residential property are severe. HMRC treats the acquisition of residential property (or property with a residential element) as an unauthorised payment equal to the market value of the prohibited asset. This triggers an unauthorised payment tax charge of 40%, plus a potential surcharge of 15% if the amount exceeds 25% of the fund value — a total of up to 55%.

These charges cannot be reversed by subsequently selling the residential element or the property as a whole. The tax point is the acquisition, not the ongoing holding. We have seen cases where members have unknowingly purchased mixed-use properties in their SIPPs — often shops with flats above — and faced devastating tax charges as a result. Prevention through rigorous due diligence is the only effective strategy.

HMRC does not apply a de minimis rule or a percentage threshold for the residential element of a mixed-use property. A small storage room that has been converted into a studio flat is as problematic as a large penthouse apartment. The question is simply: does any part of the property constitute or could constitute a dwelling?

Some advisers have explored arguments that a residential element that is currently derelict or uninhabitable is not "suitable for use as a dwelling" and therefore does not trigger the prohibition. HMRC has generally rejected this argument where the residential use is clearly recognisable and could be restored with modest investment. We do not recommend relying on the derelict residential argument without very specific HMRC clearance.

Identifying whether a property has a residential element requires careful due diligence at multiple levels:

• Title documents: The title register and deeds may identify residential use rights or separate residential title numbers.
• Planning history: The local authority's planning portal will show any planning permissions, including residential use consents or Class MA/Class G conversion approvals.
• Permitted development rights: Some commercial buildings have permitted development rights that allow residential conversion — even if not yet exercised, these can bring a building within the residential prohibition.
• Physical inspection: A building survey should identify any spaces that have been fitted out or used as a dwelling, even informally.

Your commercial property solicitor should carry out this analysis explicitly as part of their conveyancing due diligence when a SIPP is the purchaser. It is not sufficient to rely on the fact that the property is being marketed as commercial property.

In some circumstances, it is legally possible to separate a mixed-use property into distinct commercial and residential titles, with the SIPP purchasing only the commercial title. This typically requires the property to be capable of physical and legal separation — separate entrances, separate services, and the ability to create two distinct freehold or leasehold interests.

This approach is used in some retail/residential transactions, where the SIPP buys only the commercial ground floor and a separate buyer (perhaps the member personally) acquires the residential upper floors. The legal costs and complexity of achieving this separation are significant, and the arrangement must be carefully structured to ensure the SIPP has no interest in or liability for the residential element. Not all properties are physically suitable for this kind of separation.

If you are considering a mixed-use property acquisition and want to understand whether separation is feasible, contact us for an initial assessment.