Five HMRC rules you must follow when buying commercial property via a SIPP

A self-invested personal pension (SIPP) can legally buy commercial property, but HMRC attaches five specific conditions to the purchase, and getting any of them wrong can trigger a tax charge worth well over a third of the property's value.

The rules cover how much the pension can borrow, what kind of property qualifies, how the purchase must be valued, what rent applies if the pension leases the property back to a connected business, and how VAT interacts with the borrowing limit. None of them are optional, and HMRC actively checks for breaches during scheme audits and benefit crystallisation events.

This guide sets out each rule in turn, what it means in practice for SIPP and SSAS trustees, financial advisers, and business owners, and what happens if a purchase falls outside them.

The five rules at a glance

HMRC rule	Statutory standard/limit	Non-compliance tax penalty
1. Borrowing cap	Maximum 50 per cent of SIPP net asset value (NAV) prior to purchase	Up to 40 per cent Scheme Sanction Charge plus member tax charges
2. Property type	Exclusively commercial land and buildings	Up to 55 per cent Unauthorised Payment Charge on property value
3. Acquisition price	RICS 'Red Book' market valuation required	Transaction challenged; tax penalties on the market value shortfall
4. Connected rent	Open-market rental rate with a formal lease	Deemed unauthorised transfer of value to the sponsoring employer
5. VAT treatment	VAT loans count toward the 50 per cent borrowing cap	Accidental breach of the borrowing cap before VAT recovery

Rule 1: The borrowing cap – How much can a SIPP borrow to buy commercial property?

A SIPP can borrow up to 50 per cent of its net asset value immediately before the borrowing takes place, and this limit applies to the pension scheme as a whole, not just the property being purchased.

If a SIPP holds £400,000 in existing assets, for example, it can borrow up to £200,000 toward a commercial property purchase, taking its total buying power to £600,000. The cap is calculated once, at the point borrowing begins, using the scheme's net asset value at that moment.

This means the borrowing capacity of a SIPP changes as its underlying investments change in value, and trustees need an up-to-date valuation of the whole scheme, not just the target property, before agreeing borrowing terms with a lender.

Existing debt within the SIPP also reduces the net asset value used in the calculation, so a scheme carrying prior borrowing has less headroom than the raw asset figure suggests.

What counts toward the 50 per cent limit?

Net asset value includes cash, existing property, and other permitted investments held within the SIPP, minus any existing liabilities. It does not include the value of the property being purchased, since that asset doesn't yet exist within the scheme at the point the calculation is made.

Rule 2: The property type – What can a SIPP actually buy?

A SIPP may only hold commercial land and buildings, such as offices, retail units, industrial and logistics facilities, and agricultural land. Residential property is excluded outright, with narrow exceptions for certain staff accommodation directly tied to a commercial property. Mixed-use sites are permitted, but only for the commercial element, and any residential component must usually be excluded from the pension or held separately.

This restriction exists because residential property held in a pension was specifically closed off after being exploited as a tax shelter. Trustees considering a mixed-use site should get eligibility confirmed before exchange, since restructuring a purchase after completion to remove a residential element is far harder and more costly than addressing it during due diligence.

Rule 3: The purchase price and mandatory independent RICS valuations

HMRC requires an independent RICS Red Book valuation for any SIPP commercial property purchase, and this becomes non-negotiable when the transaction involves a connected party, such as the member's own business buying from, or selling to, their own pension. The valuation establishes that the price paid reflects genuine open-market value, not a figure inflated or deflated to move money in or out of the pension outside normal contribution and benefit rules.

Connected-party transactions attract particular scrutiny because they carry the clearest risk of value being manipulated for tax advantage. An independent, RICS-qualified valuer with no relationship to either party protects trustees as much as it satisfies HMRC, since it creates a defensible record if the transaction is ever queried.

Rule 4: The connected rent – What rent must be paid if I’m leasing the property back to my own business?

If a SIPP-owned property is leased to the member's own or a connected business, rent must be set and maintained at the open-market rate, supported by a formal lease and, in most cases, an independent valuation of that rent. Paying below-market rent, granting rent-free periods, or letting rent arrears build up without enforcement can all be treated by HMRC as an unauthorised transfer of value out of the pension.

Rent reviews should happen on a schedule set out in the lease, and trustees carry a duty to actually enforce those reviews rather than leaving rent unchanged informally. This is a common area of unintentional non-compliance, since business owners understandably want flexibility with their own premises, but the pension and the operating business must be treated as arm's-length parties regardless of common ownership.

Rule 5: The VAT considerations – How does VAT affect the SIPP borrowing cap?

Where a commercial property purchase is subject to VAT, and the SIPP borrows to fund that VAT element, the VAT loan counts toward the same 50 per cent borrowing cap as the rest of the purchase rather than being treated separately. This catches out trustees who calculate borrowing capacity against the property's net price and only discover the VAT borrowing pushes them over the limit once the transaction is already underway.

VAT on a commercial property purchase can usually be recovered by the SIPP if an option to tax has been made, but recovery takes time, and the borrowing used to bridge that gap still needs to sit within the overall cap throughout. Trustees should calculate total borrowing, VAT included, before agreeing terms, not after.

What happens if these rules are broken?

Breaching any of these five rules can trigger a Scheme Sanction Charge of up to 40 per cent, an Unauthorised Payment Charge of up to 55 per cent of the property's value, or both, and the member personally can also face additional tax charges on top of the scheme-level penalty. These are not small administrative fines; they are calculated as a proportion of the transaction value and can significantly outweigh any benefit the breach was meant to achieve.

HMRC can identify breaches at scheme audits, at benefit crystallisation, or when a property is later sold, and the original purchase terms come under scrutiny. Because several of the rules interact, a breach in one area often creates knock-on issues in another, which is why professional valuation and advisory input at the point of purchase is the cheaper option in almost every case.

Discuss your SIPP property needs with us now

These five rules exist to stop a SIPP being used as a way to move value to or from a connected business outside the normal tax rules that apply to pensions, and HMRC treats breaches seriously precisely because the potential for misuse is real.

None of the rules are especially complicated in isolation, but they interact, which is where most genuine mistakes happen. An independent RICS valuation at the point of purchase, and again at any connected-party rent review, remains the most reliable safeguard against an unintentional breach.

If you're planning a SIPP commercial property purchase, speaking to a RICS-qualified valuation specialist before instructing the transaction is the simplest way to avoid a costly correction later.