Stamp Duty Land Tax on Commercial Property: What Buyers Should Know Ahead of the Budget

If your business is considering purchasing commercial premises — either as an owner-occupier or as an investment through a company or SPV — Stamp Duty Land Tax (SDLT) is a significant transaction cost. It is also a tax that can change at Budget, and the Autumn Budget is one to watch.

How SDLT works on commercial property

SDLT on commercial property (non-residential and mixed-use) is charged at the following rates (as of September 2026):

• 0% on the first £150,000
• 2% on the portion between £150,001 and £250,000
• 5% on the portion above £250,000

These rates are considerably lower than residential SDLT rates, but on a substantial commercial purchase they represent a meaningful upfront cost. A £500,000 commercial property purchase attracts SDLT of £14,500 (0% × £150k + 2% × £100k + 5% × £250k).

SDLT on commercial leases

SDLT also applies to commercial leases, though the calculation is different. It is based on the Net Present Value (NPV) of the total rent payable over the lease term. For most SME leases, the liability is zero or very small — but for longer leases with higher rents, it can be a real cost. Your solicitor should calculate this as part of the transaction.

Mixed-use SDLT: an area of ongoing complexity

Mixed-use properties — those that combine commercial and residential elements, such as a flat above a shop — attract the lower commercial SDLT rates rather than residential rates. This has led to extensive use of mixed-use SDLT claims, followed by HMRC challenge and tribunal cases. Any Budget clarification or tightening of the mixed-use rules could affect acquisitions in this category.

What the Budget might change

Budget changes to commercial SDLT could include:

• Rate increases (commercial SDLT rates have been stable for several years and remain lower than residential rates)
• Changes to the thresholds at which each rate applies
• Further clarification or restriction of mixed-use treatment

For businesses planning to purchase premises, the period before a Budget announcement is a moment to consider whether completing a transaction at current rates is preferable to waiting.

Leasing vs buying: the Budget dimension

For most SMEs, leasing commercial space is more financially accessible than purchasing. But for businesses with the capital or borrowing capacity to buy, owning your premises provides insulation against future rent increases and rates changes. The Budget context — rising employment costs, potential rates changes, fiscal tightening — makes the security of ownership more attractive for some businesses, even as higher borrowing costs make it more expensive.

If you are weighing lease versus purchase, factor in SDLT at current rates, stamp duty on any mortgage, legal costs, and the financing cost at current interest rates. Then compare the total occupancy cost to what a well-negotiated lease in the same property would cost over the same period.

RE:match connects businesses with commercial space — whether they are looking to lease or find a landlord open to sale. Post your requirement at rematch.co.uk.