Commercial SDLT Rates 2026: A Complete Guide for Conveyancers

Introduction

Commercial property transactions attract a different set of SDLT rates from residential purchases, and in many cases the tax treatment is more favourable. Yet the rules are far from simple. Mixed-use properties, VAT elections, lease premiums, NPV rent calculations, and linked transactions each introduce their own complexities — and getting any of them wrong exposes your client to underpayment penalties or unnecessary overpayment.

This guide sets out the current non-residential SDLT rates, explains how they apply in practice, and works through the calculations that conveyancers encounter most frequently.

Quick calculation: Use our SDLT Calculator to compute SDLT on any commercial or mixed-use transaction instantly, including linked transactions and lease NPV.

Key Takeaways

1. Non-residential rates are lower than residential rates — the maximum rate is 5% compared to up to 12% for residential
2. Mixed-use properties (part residential, part commercial) are taxed at non-residential rates, which can produce a significant saving
3. VAT on the purchase price is included in the chargeable consideration for SDLT purposes — if your client is buying a property where the seller has opted to tax, the SDLT liability increases
4. Leasehold transactions require separate calculations for the premium and the rent (via NPV)
5. Linked transactions aggregate the total consideration across all linked deals, then apply rates to each individual transaction's share

Non-Residential SDLT Rates (2026/27)

These rates apply to purchases of commercial property, agricultural land, forests, and any other non-residential or mixed-use land and buildings.

These are slice rates, not slab rates. Each band applies only to the portion of the purchase price falling within it — the same progressive structure as residential SDLT.

Worked Example: Freehold Commercial Purchase at £475,000

• First £150,000 at 0% = £0
• Next £100,000 (£150,001 – £250,000) at 2% = £2,000
• Remaining £225,000 (above £250,000) at 5% = £11,250
• Total SDLT: £13,250

Worked Example: Freehold Commercial Purchase at £150,000

The entire amount falls within the 0% band. SDLT due: £0.

Note: The nil-rate band for non-residential transactions (£150,000) is higher than the standard residential nil-rate band (£125,000), making commercial property slightly more tax-efficient at the lower end.

Mixed-Use Properties

A mixed-use property is one that contains both residential and non-residential elements — for example, a flat above a shop, a farmhouse with agricultural land, or a building with a ground-floor commercial unit and upper-floor flats.

Why This Matters

Mixed-use transactions are taxed at non-residential rates, not residential rates. This is often a significant advantage. For a purchase at £750,000:

At residential rates (standard):

• First £125,000 at 0% = £0
• Next £125,000 at 2% = £2,500
• Next £675,000 at 5% = £26,250 (applying 5% to the £500,001–£925,000 band portion)
• Portion above £925,000: not applicable here
• Total SDLT: £28,750 (using standard residential bands)

At non-residential rates:

• First £150,000 at 0% = £0
• Next £100,000 at 2% = £2,000
• Remaining £500,000 at 5% = £25,000
• Total SDLT: £27,000

The saving is £1,750 in this example, but at higher values the difference widens considerably. In addition, the 5% additional property surcharge does not apply to non-residential transactions, so a buyer who already owns a residential property avoids that surcharge entirely when purchasing a mixed-use property.

What Qualifies as Mixed-Use?

HMRC applies a factual test. The property must genuinely contain a non-residential element at the effective date of the transaction. Common examples:

• A dwelling with significant agricultural land (beyond normal garden or grounds)
• A building with a commercial unit on the ground floor and flats above
• A property with an active business use (e.g., a bed and breakfast, a home office that constitutes a separate business premises)

Warning: HMRC has increasingly challenged mixed-use claims, particularly where the non-residential element is marginal. A large garden, a paddock used for personal horses, or a detached garage used casually for storage will not generally qualify. The non-residential element must be genuine, identifiable, and distinct.

VAT and SDLT on Commercial Property

The Fundamental Rule

SDLT is charged on the VAT-inclusive purchase price. If the seller has opted to tax the property (or the sale is a standard-rated supply for another reason), the buyer pays SDLT on the price plus VAT.

Practical Impact

A commercial property sold for £400,000 plus VAT:

• VAT-inclusive price: £480,000
• First £150,000 at 0% = £0
• Next £100,000 at 2% = £2,000
• Remaining £230,000 at 5% = £11,500
• Total SDLT: £13,500

Without VAT, the SDLT would be £10,750. The VAT election adds £2,750 to the SDLT bill.

Transfer of a Going Concern (TOGC)

If the transaction qualifies as a TOGC, no VAT is charged and the SDLT is calculated on the net price. This is a common planning point in commercial conveyancing — ensure your client's tax adviser has considered TOGC treatment where applicable.

Acting for the Buyer: Key Checks

1. Has the seller opted to tax the property?
2. Is the transaction a standard-rated supply or a TOGC?
3. Has the buyer obtained confirmation of the VAT position in pre-contract enquiries?
4. If VAT applies, has the buyer factored the higher SDLT cost into their budget?

Lease Premiums

When a commercial lease is granted for a premium (a capital sum), the premium is taxed using the same non-residential rates as a freehold purchase.

Worked Example: Lease Premium of £200,000

• First £150,000 at 0% = £0
• Remaining £50,000 at 2% = £1,000
• SDLT on the premium: £1,000

If the lease also requires rent, the SDLT on the rent is calculated separately using the NPV method (see below) and added to the SDLT on the premium.

SDLT on Rent: The NPV Calculation

For commercial leases with rent, SDLT is charged on the net present value (NPV) of the total rent payable over the term of the lease.

NPV Rates

How NPV Works

The NPV calculation discounts future rent payments to their present-day value using a temporal discount rate of 3.5%. The formula for each year's rent is:

NPV of year n rent = Annual rent / (1.035)^n

Where n is the number of complete years from the start of the lease to the year in question (starting at n = 0 for year 1).

Worked Example: 10-Year Lease at £30,000 Per Annum

Assuming constant rent of £30,000 per year over a 10-year term:

SDLT on the rent NPV:

• First £150,000 at 0% = £0
• Remaining £108,197.54 at 1% = £1,081.98
• SDLT on rent: £1,082 (rounded down to nearest pound)

If a premium of £200,000 was also paid, the total SDLT would be £1,000 (premium) + £1,082 (rent NPV) = £2,082.

Tip: For leases with rent reviews or stepped rents, you must use the rent actually known or ascertainable at the effective date. If future rent increases are specified in the lease, include them. If they depend on a future rent review to open market value, use the initial rent for the entire term and file a further return if the rent changes significantly.

Multiple Dwellings Relief and Commercial Property

Multiple dwellings relief (MDR) is a residential relief and does not apply to non-residential transactions. However, it becomes relevant in two situations:

1. Mixed-Use Properties with Multiple Dwellings

If a mixed-use property contains more than one dwelling — for example, a commercial building with three flats above — the buyer may need to consider whether to claim MDR on the residential element or treat the whole transaction as non-residential. In practice, the non-residential treatment often produces a better result, but this should be calculated both ways.

2. Six or More Dwellings

A purchase of six or more dwellings in a single transaction can be treated as a non-residential transaction (FA 2003, s 116(7)). This is a valuable planning point for portfolio purchases. The buyer can choose whether to claim MDR or elect for non-residential treatment — whichever produces the lower SDLT.

Warning: HMRC has been actively challenging MDR claims since 2022, and the relief was abolished for transactions completing on or after 1 June 2024. For transactions completing before that date, previously valid MDR claims may still be under enquiry. Ensure you are advising on the current position.

Linked Transactions

Transactions are linked if they form part of a single scheme, arrangement, or series of transactions between the same vendor and purchaser (or connected persons).

How Linking Affects SDLT

When transactions are linked:

1. Aggregate the total consideration across all linked transactions
2. Apply the SDLT rates to the aggregated total
3. Apportion the resulting SDLT across each individual transaction in proportion to its consideration

Worked Example: Two Linked Commercial Purchases

A buyer purchases two commercial units from the same vendor: Unit A for £200,000 and Unit B for £300,000.

Aggregate consideration: £500,000

SDLT on £500,000:

• First £150,000 at 0% = £0
• Next £100,000 at 2% = £2,000
• Remaining £250,000 at 5% = £12,500
• Total SDLT: £14,500

Apportioned:

• Unit A: £14,500 x (£200,000 / £500,000) = £5,800
• Unit B: £14,500 x (£300,000 / £500,000) = £8,700

Compare this to two unlinked transactions:

• Unit A (£200,000): £0 + £1,000 = £1,000
• Unit B (£300,000): £0 + £2,000 + £2,500 = £4,500
• Total if unlinked: £5,500

Linking increases the total SDLT by £9,000 in this example. This is because the aggregation pushes more consideration into the higher-rate bands.

When Are Transactions Linked?

HMRC applies a broad interpretation. Transactions are likely linked if:

• They involve the same parties (or connected parties)
• They are part of a pre-agreed deal
• They would not have been entered into independently of each other
• There is a contractual or practical connection

Separate transactions to unconnected buyers, or genuinely independent transactions to the same buyer at different times without a prior arrangement, are not linked.

Filing Considerations

Commercial SDLT Returns

Commercial transactions follow the same filing requirements as residential — the SDLT1 return must be filed within 14 days of the effective date, and the tax must be paid by the same deadline.

Key Differences in the Return

• Ensure you select the correct property type (non-residential or mixed-use) on the return
• If claiming mixed-use treatment, be prepared to justify the non-residential element if HMRC enquires
• For leasehold transactions, the premium and NPV of rent are entered separately
• Linked transactions require disclosure on each return, with the total linked consideration stated

Summary

Non-residential SDLT is simpler in its rate structure than residential SDLT, but the surrounding rules — mixed-use classification, VAT treatment, NPV rent calculations, and linked transactions — add real complexity. Getting the property classification right is the single most important step: it determines the rates, the available reliefs, and the surcharges (or lack thereof) that apply.

For conveyancers handling commercial or mixed-use transactions, the key is to identify the SDLT issues early in the transaction — ideally at the instruction stage — and ensure that VAT status, linking, and property classification are all addressed before completion.

Related Guides

• SDLT on Leasehold Transactions — premiums, NPV rent calculations, and overlap relief
• SDLT Rates 2026: Complete Guide — all residential and commercial rates compared
• SDLT Reliefs and Exemptions — group relief, charities, and other commercial reliefs

Need to calculate SDLT on a commercial or mixed-use transaction? Try our free SDLT Calculator — it handles non-residential rates, lease NPV, and linked transactions automatically.

Preparing for the May 2026 tax adviser registration deadline? Check your firm's readiness with our Compliance Checker.