The 15% SDLT Flat Rate on Company-Bought Dwellings: Who Gets Caught and Who Gets Relief

Buy a single dwelling worth more than £500,000 through a limited company, without claiming relief, and the SDLT bill is not calculated on the normal residential bands at all. It is a flat 15% of the entire purchase price, charged under FA2003 Schedule 4A. On a £750,000 property that is £112,500 of stamp duty before any other surcharge is even considered — a rate most buyers only discover exists once their solicitor asks whether the purchasing entity qualifies for relief.

Who this actually targets

The 15% rate was introduced to stop high-value homes being bought through corporate wrappers purely to obscure beneficial ownership or to bank future tax advantages, not to catch every property company in the country. It applies to "non-natural persons" acquiring a "higher threshold interest" in a single dwelling for more than £500,000: companies, partnerships with at least one corporate partner, and certain collective investment schemes. An individual buying in their own name is never in scope, however expensive the property, and a company buying commercial or mixed-use property is unaffected — the charge is specific to dwellings.

Crucially, the 15% applies to the whole consideration once the £500,000 threshold is crossed, not just the excess above it, and it is assessed regardless of how the purchase is financed. A company buying with a 90% mortgage faces exactly the same flat-rate exposure as one paying entirely in cash.

The reliefs that bring it back down to normal rates

Most property businesses never actually pay 15%, because Schedule 4A provides relief for genuine commercial activity, and where relief applies the purchase reverts to the ordinary residential SDLT bands, still generally including the additional dwellings surcharge that applies to company purchasers. The main categories are a property rental business letting the dwelling to unconnected tenants on a commercial, arm's-length basis; a property development or property trading business acquiring the dwelling to develop or resell it in the course of that trade; and dwellings genuinely made available to the public, such as certain historic houses. Financial institutions acquiring a dwelling in the ordinary course of lending, and dwellings held for employees of a qualifying trade in specific circumstances, have their own separate relief categories.

Relief has to be claimed on the SDLT return; it is not automatic simply because the buyer happens to be a property company. HMRC expects the return to reflect the intended qualifying use from the outset, and a business with no lettings history or development track record can expect closer scrutiny of whether the relief claim genuinely reflects how the property is going to be used.

The 3-year clawback that catches people after completion

Claiming relief is not the end of the story. If, within 3 years of the effective date of the transaction, the qualifying condition stops being met — most commonly, if a person connected with the company (a director, a shareholder, or someone connected with either) starts occupying the dwelling — the relief is treated as withdrawn from that point. The company then owes the difference between what was actually paid and the 15% rate that would otherwise have applied, together with interest, and has to notify HMRC of the change within 30 days.

This is the trap that catches property companies specifically. A director who buys a high-value dwelling through the company on rental relief, genuinely intending to let it, and then decides eighteen months later to move in themselves — between tenancies, during a refurbishment, or simply because circumstances changed — triggers the clawback the moment they occupy it, however good the original intention was. The 3-year window means this exposure does not end at completion; it needs tracking for as long as the relief conditions have to keep being met.

Where this sits next to ATED

The 15% SDLT charge is often confused with the Annual Tax on Enveloped Dwellings, but they are different taxes assessed at different points: SDLT at 15% is a one-off charge on acquisition, while ATED is an ongoing annual charge on residential property already held in a company above the relevant value threshold. The two taxes broadly share the same relief categories — a genuine rental or development business tends to qualify for relief from both — but each has to be claimed and reported separately, on separate returns, and losing relief under one does not automatically mean relief is lost under the other, though in practice the same change in use, such as a connected person moving in, tends to affect both at once.

What this means in practice

• Check the £500,000 threshold before exchange, not after — the 15% rate is triggered by the purchase price of the dwelling, so it needs factoring into the deal before contracts are signed, not discovered at the SDLT return stage.
• Claim relief on the return itself — genuine rental and development businesses are not charged 15% by default, but the relief has to be actively claimed and supported by evidence of the intended qualifying use.
• Track the 3-year clawback window on every relieved purchase — a director or connected person moving in during that period, even briefly, can trigger a repayment of the relief plus interest.
• Remember ATED runs alongside it, not instead of it — a company holding a high-value dwelling after purchase still needs to consider the annual ATED position separately.
• Get the purchasing structure right before completion — unwinding a 15% SDLT exposure after the fact is far harder than structuring the purchase and the relief claim correctly from the outset.

Common questions

When does the 15% SDLT flat rate apply to a company buying property?

Under FA2003 Schedule 4A, when a company or other non-natural person buys a single dwelling for more than £500,000 with no relief claimed. It applies to the whole price, not just the excess, and regardless of how the purchase is funded.

Can a property company avoid the 15% rate?

Usually yes, where the dwelling is bought for a genuine qualifying activity such as commercial letting to unconnected tenants or property development, and relief is properly claimed on the SDLT return.

What happens if a director later moves into a company-owned dwelling that claimed relief?

If a connected person occupies it within 3 years of purchase, the relief can be withdrawn, triggering a clawback up to the 15% rate plus interest, with a 30-day notification obligation.

Is the 15% SDLT rate the same as ATED?

No. The 15% rate is a one-off charge on acquisition; ATED is a separate ongoing annual charge on company-held residential property above a value threshold, reported independently.

This article is general information, not personal tax advice, and tax rules change. Your own position depends on facts we cannot see from here — please take advice before acting on anything above.

← All articles