Mixed-use stamp duty: how SDLT works on mixed-use property

How stamp duty works on a mixed-use property

Stamp Duty Land Tax on a mixed-use property is charged at the non-residential rates, the same rates that apply to a wholly commercial purchase. This is because a property with a genuine commercial part is not a purely residential one in HMRC's eyes.

The non-residential rates are a separate, banded scale from the residential rates. On higher-value purchases the non-residential scale is often lower, which is one reason mixed-use assets are attractive to buyers.

Why mixed-use SDLT is often cheaper

Two features of the non-residential rates can reduce the bill compared with buying a comparable residential property:

• The banded non-residential scale is often lower than the residential scale at higher values
• The residential surcharges, including the additional-property surcharge, do not apply to a non-residential or mixed-use purchase

For an investor buying an additional property, avoiding the residential surcharge can be a meaningful saving, which is part of the appeal of the asset class.

What qualifies as mixed-use for stamp duty

To be charged at the non-residential rates, a property must genuinely include both residential and non-residential parts. The commercial element must be real, not token.

• A shop or office with a flat above
• A pub, restaurant or guest house with accommodation
• A retail parade with residential uppers
• Land in genuine commercial or agricultural use alongside a dwelling

HMRC looks at substance, not the label on the listing. A notional or unused commercial space can be challenged and re-assessed at the residential rates.

Recent HMRC cases have tightened the test

A run of tribunal cases has narrowed what HMRC accepts as mixed-use. Claims that a small piece of land or a marginal commercial feature makes a house mixed-use have repeatedly failed.

The lesson is that the commercial part must be genuine and material. Buyers relying on mixed-use treatment should have the position reviewed before completion, not assumed.

How the SDLT is calculated

The non-residential SDLT is worked out on a banded basis against the purchase price, with each band taxed at its own rate. The whole mixed-use purchase is assessed under this single non-residential scale.

Because the calculation depends on the price, the bands and any reliefs, the exact figure should come from your conveyancer's SDLT calculation rather than a rule of thumb. Scotland and Wales operate their own equivalents, Land and Buildings Transaction Tax and Land Transaction Tax.

Work out an indicative figure

The current England and Northern Ireland non-residential scale charges nothing on the first £150,000, 2 percent on the slice from £150,001 to £250,000, and 5 percent on anything above £250,000, worked out band by band. Our mixed-use stamp duty calculator applies that scale and shows the saving against the residential charge.

The three-year rule and the higher-rate refund

The three-year rule that buyers ask about is a residential one: where someone buys a new main home before selling the old one and pays the residential additional-property surcharge, they can reclaim that surcharge if they sell the former home within three years. It is a residential mechanism.

On a genuine mixed-use purchase the point rarely bites, because the non-residential rates carry no additional-property surcharge in the first place. The saving is built in rather than reclaimed later.

Buying mixed-use through a limited company

Many investors buy mixed-use property through a limited company. For stamp duty this makes little difference to the mixed-use position: a company buying a genuine mixed-use property is still charged at the non-residential rates, and the residential surcharge still does not apply.

What a company purchase does not attract on mixed-use is the flat 15 percent higher-rate charge that can hit a company buying a single dwelling over £500,000, because that charge is a residential one. The mixed-use treatment keeps the purchase on the non-residential scale. The company structure itself is a tax and accounting decision for your adviser.

Is mixed-use stamp duty changing

Residential SDLT thresholds changed from April 2025 when a temporary nil-rate band reverted, which is why residential buyers saw their bills move. The non-residential and mixed-use rates used for semi-commercial property have been stable through that period.

Rates and bands are set by the government and can change at any Budget or fiscal event, so the safe approach is to confirm the live figures with your conveyancer at the point of purchase rather than rely on a rate quoted months earlier.

How stamp duty fits the wider purchase costs

SDLT is one of several day-one costs on a mixed-use purchase, alongside the deposit, the arrangement fee, the valuation and legal fees. The non-residential treatment can make the tax line smaller than a buyer expects from residential experience.

We set out the full day-one cash requirement so the stamp duty, confirmed by your adviser, sits alongside the deposit and fees in one picture.

Why this matters when financing the deal

The SDLT treatment does not change the mortgage, but it changes the cash a buyer needs to complete, which feeds into the deposit and the overall affordability of the purchase.

Because the saving can be significant on higher-value deals, it is worth confirming the mixed-use position early, with your conveyancer, so it can be factored into the funding plan from the outset.

Stamp Duty Land Tax (SDLT)

The tax on property purchases in England and Northern Ireland, charged at residential or non-residential rates.

Non-residential rates

The SDLT scale applied to commercial and mixed-use property, often lower than residential rates at higher values.

Additional-property surcharge

An extra residential SDLT charge that does not apply to a mixed-use or non-residential purchase.