Stamp Duty Land Tax Buy to Let: Rates, Surcharges, and Relief Strategies

SDLT is one of the most significant day-one capital costs in property investment and one of the most poorly understood. Many investors calculate based on outdated rates or forget the additional property surcharge altogether. For 2026 transactions, here are the correct figures and the relief strategies that professional investors use to reduce their liability.

The Additional Property Surcharge

When you buy a residential property that is not your only or main residence, you pay SDLT at the standard rates plus a 5% surcharge on every tranche. The surcharge was increased from 3% to 5% in October 2024 — if you are using calculations based on the older 3% figure, they are wrong.

The combined rates for buy-to-let investors (individual buyers) in 2026 are:

Worked examples:

A £150,000 property (Northern terraced house):

• 5% on first £125,000 = £6,250
• 7% on remaining £25,000 = £1,750
• Total SDLT: £8,000

A £250,000 property (Midlands semi-detached):

• 5% on first £125,000 = £6,250
• 7% on remaining £125,000 = £8,750
• Total SDLT: £15,000

A £350,000 property (commuter belt house):

• 5% on first £125,000 = £6,250
• 7% on next £125,000 = £8,750
• 10% on final £100,000 = £10,000
• Total SDLT: £25,000

This is why the mathematics of buy-to-let strongly favour lower-priced Northern and Midlands stock. The 5% SDLT surcharge on a £600,000 property in the South East costs £30,000 on day one. On a £200,000 asset in the North, the same surcharge costs approximately £11,250. The compounding effect of reduced entry costs on cash-on-cash returns is substantial.

Companies and the 17% Rate

Limited companies (including SPVs used for buy-to-let) are classed as "non-natural persons" and always pay the 5% surcharge — even if it is the company's first property. The 5% threshold classification still applies: 5% on the first £125,000, 7% on £125,001 to £250,000, and so on.

However, there is a 17% flat-rate trap for company purchases above £500,000. If a company buys a single dwelling for more than £500,000, the transaction triggers a punitive 17% flat rate (increased from 15% in October 2024) on the entire purchase price — not a progressive calculation.

For genuine buy-to-let businesses, statutory relief is available from this 17% rate. If the property is acquired for use in a commercial property rental business — meaning you are letting it out rather than occupying it — the company instead pays the standard progressive rates (5%, 7%, 10%, etc.) as shown in the table above. This relief must be claimed on the SDLT return. Failure to claim it results in the 17% flat rate applying by default.

Multiple Dwellings Relief

If you purchase six or more residential properties in a single transaction, you can elect to pay non-residential SDLT rates rather than residential rates. Non-residential rates do not attract the additional property surcharge and peak at 5%, making this a significant saving at scale.

For example, purchasing a portfolio of eight terraced houses valued at £1.2 million collectively:

• At residential rates with the 5% surcharge, the SDLT liability would be substantial.
• Electing non-residential treatment means the entire transaction is taxed at commercial rates with no higher-rate surcharge.

The six-property threshold can sometimes be structured intentionally on portfolio acquisitions. If you are acquiring between four and seven properties, it is worth discussing with a solicitor whether structuring the transaction to cross the threshold is feasible.

Note: Multiple dwellings relief (MDR) for transactions involving fewer than six properties was abolished in June 2024. The relief previously available when buying multiple properties individually in a single contract no longer applies. If you see older guidance referencing MDR for individual portfolio acquisitions of two to five properties, it is out of date.

Mixed-Use Property SDLT

A property with both residential and commercial elements is classified as mixed use for SDLT purposes. The entire transaction is taxed at non-residential (commercial) rates, regardless of the value split between the residential and commercial components. Critically, the additional 5% surcharge does not apply to mixed-use transactions.

Non-residential SDLT rates:

• 0% up to £150,000
• 2% on £150,001 to £250,000
• 5% above £250,000

For a £500,000 mixed-use property (a flat above a shop, for example):

• 0% on first £150,000 = £0
• 2% on next £100,000 = £2,000
• 5% on remaining £250,000 = £12,500
• Total SDLT: £14,500

At residential investor rates with the 5% surcharge, the same £500,000 transaction would carry a liability of £40,000. The saving is £25,500.

This is why commercial premises with residential accommodation above — a common asset type in Northern town centres — attract sustained investor interest beyond the headline yield figures. The SDLT arbitrage is substantial.

However, mixed-use classification requires genuine commercial use of the non-residential element. A property with a garage or outbuilding does not qualify. There must be a legitimate commercial component in active use (typically a retail unit, office, or workshop). HMRC scrutinises mixed-use claims carefully, and there is a body of case law distinguishing genuine mixed use from attempted misclassification.

Non-Resident Investors

Non-UK resident investors face an additional 2% SDLT surcharge on top of all the rates shown above. A non-resident individual buying a buy-to-let property starts at 7% (5% standard surcharge + 2% non-resident surcharge) on the first £125,000 tranche. A non-resident company purchasing above £500,000 would face the 17% flat rate plus the 2% non-resident surcharge — though the statutory rental business relief still applies to reduce the flat rate to the progressive rates plus 2%.

SDLT in a Corporate Transfer

If you are transferring a personally-owned property into a limited company, the company must pay SDLT on the full market value at the time of transfer. This is one of the largest friction costs of the incorporation route. SDLT on a £250,000 transfer costs £15,000; on a £350,000 property, it costs £25,000. These are real cash costs that must be funded from somewhere — typically extracted from the company's own capital or paid personally by the director.

This is the primary reason many landlords with existing portfolios remain stuck in personal names despite the Section 24 disadvantage: the upfront SDLT and CGT costs of incorporation exceed the projected Corporation Tax saving over their intended holding period.

For the full tax structuring analysis — including Section 24 impact modelling, incorporation relief criteria, CGT on disposal, and ICR mortgage stress tests — the England Property Investment Guide contains the worked decision frameworks.

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