Commercial Property SDLT Calculator UK 2026
Non-residential (commercial) SDLT rates are 0% on the first £150,000, 2% on £150,001–£250,000 and 5% on the amount above £250,000 — a maximum rate of just 5%. Critically, the 5% additional-property surcharge and the 2% non-resident surcharge do NOT apply to non-residential purchases. New commercial leases attract SDLT on both the premium (at the rates above) and the net present value of the rent (1% above £150,000, 2% above £5m).
Commercial SDLT = (0% × first £150,000) + (2% × £150,001–£250,000) + (5% × amount above £250,000)
Stamp Duty Land Tax on commercial and non-residential property works very differently from residential SDLT. The top rate is just 5% (versus up to 17% on additional residential property), and neither the 5% additional-property surcharge nor the 2% non-resident surcharge applies. That makes commercial and genuine mixed-use property a notably tax-efficient route for many investors.
This 2026 calculator handles freehold purchases, lease premiums and the net-present-value (NPV) charge on rent, plus mixed-use property. Whether you’re buying a shop, office, warehouse, or a flat above a shop, you’ll get an accurate calculation against the current HMRC non-residential rates.
What This Means
Your calculated SDLT uses non-residential rates (max 5%). If the property is genuinely mixed-use — containing both residential and commercial elements, such as a flat above a shop — non-residential rates apply to the entire purchase, which can save tens of thousands compared with residential or buy-to-let rates. For leases, SDLT is charged on both the premium (lump sum) and the net present value (NPV) of the rent over the term.
Non-Residential SDLT Rates (2026)
The following SDLT rates apply to non-residential and mixed-use freehold purchases in England and Northern Ireland. These rates have been stable and are unchanged for 2026:
| Purchase Price Band | Non-Residential Rate | Residential Rate (for comparison, from 1 Apr 2025) |
|---|---|---|
| Up to £150,000 | 0% | 0% to £125,000, then 2% |
| £150,001–£250,000 | 2% | 2% |
| Over £250,000 | 5% | 5% (£250,001–£925,000), then 10%/12% |
Key advantages of commercial SDLT rates:
- No 5% additional-property surcharge (a large saving versus buy-to-let residential)
- No 2% non-UK resident surcharge — commercial rates are the same regardless of buyer residence
- Maximum rate capped at 5% versus up to 12% standard / 17% additional for residential
- Genuine mixed-use property qualifies for non-residential rates on the entire purchase
Commercial SDLT Worked Examples
How commercial SDLT compares with residential rates at different purchase prices (residential figures use the rates effective from 1 April 2025):
| Purchase Price | Commercial SDLT | Standard Residential SDLT | BTL Residential SDLT |
|---|---|---|---|
| £150,000 | £0 | £500 | £8,000 |
| £250,000 | £2,000 | £2,500 | £15,000 |
| £300,000 | £4,500 | £5,000 | £20,000 |
| £500,000 | £14,500 | £15,000 | £40,000 |
| £1,000,000 | £39,500 | £41,250 | £91,250 |
| £2,000,000 | £89,500 | £153,750 | £253,750 |
Commercial SDLT is dramatically lower than buy-to-let residential SDLT at every price point because the 5% additional-property surcharge never applies. At high values it is also lower than standard residential SDLT, since the commercial rate caps at 5% while residential reaches 10–12%.
SDLT on Commercial Leases
When you take a new commercial lease, SDLT may be payable on two separate elements:
- Lease premium: a one-off capital payment to the landlord (treated like a purchase price), charged at the non-residential rates above.
- Net Present Value (NPV) of rent: the total rent over the lease term discounted to present value using HMRC’s 3.5% temporal discount rate. SDLT on the NPV is 0% up to £150,000, 1% on the slice from £150,001 to £5,000,000, and 2% above £5,000,000.
| NPV of Rent Band | SDLT Rate |
|---|---|
| Up to £150,000 | 0% |
| £150,001–£5,000,000 | 1% |
| Over £5,000,000 | 2% |
Example: A 10-year lease at £50,000 per annum with no premium. The NPV of the rent (discounted at 3.5%) is approximately £418,000. SDLT on the NPV = 0% on the first £150,000 + 1% on £268,000 = £2,680. There is no premium, so no further SDLT is due. The SDLT return must still be filed within 14 days even where rent is the only charge.
Mixed-Use Properties: A Valuable Strategy
Genuinely mixed-use property (containing both residential and commercial elements) is taxed at non-residential SDLT rates on the whole price, which can produce large savings versus residential or buy-to-let rates (residential figures below use the rates from 1 April 2025):
| Purchase Price | Residential SDLT | BTL Residential SDLT | Mixed-Use SDLT | Saving vs BTL |
|---|---|---|---|---|
| £300,000 | £5,000 | £20,000 | £4,500 | £15,500 |
| £500,000 | £15,000 | £40,000 | £14,500 | £25,500 |
| £750,000 | £27,500 | £65,000 | £27,000 | £38,000 |
Common genuine mixed-use examples include:
- A flat above a trading shop or restaurant let on a commercial lease
- A house with a separate, genuinely commercial unit (e.g. a let office or workshop)
- Agricultural land with a farmhouse, in active commercial farming use
- Property sold together with commercial woodland or grazing land let to a third party
Important: HMRC scrutinises mixed-use claims heavily and several First-tier Tribunal cases have failed. The commercial element must be genuine and in actual (or clearly intended) commercial use — a large garden, paddock or unused outbuilding does not qualify. Always take professional advice before claiming mixed-use status.
Tax Planning Considerations
Commercial property SDLT offers several legitimate planning opportunities:
- Mixed-use strategy: a property in genuine commercial use attracts the lower non-residential rates. A flat above a trading shop at £500,000 pays £14,500 (non-residential) versus £40,000 at buy-to-let residential rates — but the commercial use must be real and evidenced.
- Six or more dwellings: a single transaction buying 6 or more separate dwellings can still be treated as non-residential under the general SDLT rules. Multiple Dwellings Relief was abolished for transactions from 1 June 2024, so this 6+ rule is now the main remaining lever for portfolios.
- Surcharges don’t apply: neither the 5% additional-property surcharge nor the 2% non-resident surcharge applies to non-residential or genuine mixed-use purchases, regardless of buyer type or residence — a structural advantage for companies and overseas investors.
- Lease vs purchase: for shorter-term needs, leasing can be more SDLT-efficient than buying outright, as the NPV charge (1% above £150,000) is often far lower than freehold SDLT at the equivalent value.
Disclaimer: Tax planning should always be done with professional advice. HMRC can challenge arrangements it considers artificial or abusive, and mixed-use status in particular is frequently litigated. Ensure any approach is fully compliant with current legislation.