The financial benefit of mixed-use SDLT treatment can be substantial. A landlord purchasing a £500,000 property as an additional residential dwelling would pay approximately £50,000 in SDLT (standard residential rates plus the 5% additional dwelling surcharge). If the same property qualifies as mixed-use, because it includes a paddock genuinely used for agricultural purposes, a barn with a history of commercial use, or a commercial unit, the non-residential SDLT rates apply: approximately £14,500. The potential saving of approximately £35,500 on a single transaction has made mixed-use SDLT claims extremely popular, and, in some cases, aggressively over-claimed.
The landmark Fiander and Bower v HMRC [2021] UKUT 0156 (TC) case gave mixed-use SDLT claims a significant boost. The Upper Tribunal found that two properties with paddocks used for keeping horses qualified as mixed-use, the paddocks were not purely ornamental and were used for genuine non-residential purposes. HMRC's initial response was to issue guidance limiting the scope of the decision. Post-Fiander, HMRC has targeted high-volume mixed-use claim scenarios, particularly paddock claims, with targeted enquiry campaigns. Conveyancing solicitors who have made significant volumes of mixed-use SDLT claims have received HMRC information requests. The result: a claim that was commercially attractive has become legally risky for claims that cannot be robustly evidenced.
Non-residential SDLT rates, what qualifies as mixed-use, the Fiander and Bower case, HMRC scrutiny and penalty risks
The complete framework for SDLT mixed-use property relief:
- Non-residential SDLT rates, comparison with residential additional dwelling rates and the financial benefit of mixed-use treatment: SDLT MIXED-USE: Finance Act 2003 s.116 provides that a transaction is 'mixed' if it involves both residential property (as defined in s.116(1)) and non-residential property (which is everything else, commercial; agricultural; industrial; or any land not used as or suitable for use as a dwelling). When a transaction is mixed, the non-residential SDLT rates apply to the ENTIRE consideration (not just the non-residential portion). NON-RESIDENTIAL SDLT RATES (applicable to the full purchase price in a mixed-use transaction): 0% on the first £150,000; 2% on £150,001-£250,000; 5% on amounts above £250,000. There is NO additional dwelling surcharge (the 5% surcharge that applies to companies and individuals purchasing additional residential properties does NOT apply to non-residential or mixed-use transactions). RESIDENTIAL ADDITIONAL DWELLING SDLT RATES (for comparison): 0% on the first £250,000 (standard band); 5% on £250,001-£925,000; 10% on £925,001-£1.5m; 12% above £1.5m; PLUS 5% surcharge on the ENTIRE purchase price. COMPARATIVE EXAMPLES: (a) £300,000 property as residential additional dwelling: £0 on first £250k = £0; 5% × £50k = £2,500; 5% surcharge × £300k = £15,000; TOTAL = £17,500. Same property mixed-use (non-residential): £0 on first £150k; 2% × £100k = £2,000; 5% × £50k = £2,500; TOTAL = £4,500. SAVING = £13,000. (b) £500,000 property as residential additional dwelling: 5% × £250k = £12,500; 5% surcharge × £500k = £25,000; 5% × £250k above = £12,500 (to complete the standard slice calc) = approximately £50,000 TOTAL (detailed calc: 0% × £250k + 5% × £250k + 5% sur × £500k = £12,500 + £25,000 = £37,500; wait, need to recalculate... Standard residential rates (additional dwelling from April 2025, 5% surcharge now applies: 5% on 0-250k, 10% on 250k-925k, 15% on 925k-1.5m, 17% above 1.5m for additional dwellings from April 2025, Autumn Statement 2024 increased surcharge from 3% to 5% from 31 October 2024): 5% × £250k = £12,500; 10% × £250k = £25,000; total = £37,500. Mixed-use non-residential: £0 × £150k + 2% × £100k + 5% × £250k = £0 + £2,000 + £12,500 = £14,500. Saving = £23,000). The saving scales with the purchase price. IMPORTANT NOTE ON ADDITIONAL DWELLING SURCHARGE: from 31 October 2024 (Autumn Budget 2024), the additional dwelling SDLT surcharge was increased from 3% to 5%, further increasing the financial advantage of mixed-use treatment for additional dwelling purchasers.
- What qualifies as a mixed-use property, the Fiander and Bower case, HMRC post-Fiander approach and penalty risks: WHAT QUALIFIES AS MIXED-USE FOR SDLT: the non-residential element must genuinely exist as a distinct part of the transaction, not merely incidental or ancillary to the residential use. Accepted non-residential elements: (a) AGRICULTURAL LAND: land that is genuinely farmed or used for agricultural purposes (growing crops; grazing livestock; market gardening; horticulture), the land must be currently or recently used for agriculture, not merely designated as agricultural in planning terms; evidence: agricultural tenancy; farm business tenancy; grazing licence; rent receipts; farm subsidy records; (b) COMMERCIAL OUTBUILDING OR BARN: an outbuilding or barn that has a current or recent history of commercial use (storage; light industry; workshop; equestrian commercial enterprise), the commercial use must be real and current or recent, not historical; planning use class: B2 (general industrial), B8 (storage/distribution), or Class E (commercial) is relevant evidence; (c) COMMERCIAL UNIT: a self-contained commercial unit forming part of the same purchase (a ground-floor shop or office within a mixed-use building), the clearest case of mixed-use; (d) PADDOCK USED FOR LIVESTOCK/EQUESTRIAN BUSINESS: a paddock that is genuinely used for keeping horses for commercial equestrian purposes (riding school; livery yard; breeding), NOT ornamental or personal equestrian use. WHAT DOES NOT QUALIFY: (a) ORNAMENTAL PADDOCK: a paddock that is managed as garden/amenity grass and used for the owner's personal horses or recreational riding, HMRC treats this as residential; (b) DOMESTIC GARDEN: even a large garden used purely for domestic purposes is residential; (c) WOODLAND: residential woodland (e.g., a managed amenity woodland forming part of a country estate) is typically residential; BUT commercial woodland (e.g., a plantation managed under a forest management plan for timber production) may be non-residential. FIANDER AND BOWER v HMRC [2021] UKUT 0156 (TC): the Upper Tribunal found that two properties, each including a paddock used for keeping horses, qualified as mixed-use for SDLT. The Tribunal held that the paddocks were used for keeping horses (a non-residential activity) and that the use of a paddock for keeping horses is not within the definition of a 'garden or grounds' of a dwelling. HMRC's POST-FIANDER APPROACH: following Fiander & Bower, HMRC issued guidance distinguishing between genuine equestrian commercial use (which may qualify) and ornamental or personal horse-keeping (which HMRC treats as residential/garden). HMRC has issued targeted information requests to conveyancing solicitors who filed large volumes of mixed-use SDLT claims based on paddock grounds. PENALTY RISKS: SDLT returns must be filed within 14 days of completion. An incorrect mixed-use claim: (a) AMENDMENT WINDOW: the taxpayer has 12 months from the filing deadline to amend the SDLT return; (b) HMRC ENQUIRY: HMRC has 9 months from the filing date to open an enquiry (or later if the return was filed late); (c) DISCOVERY ASSESSMENT: HMRC can issue a discovery assessment 4 years after the tax year (6 years for careless error; 20 years for deliberate error); (d) PENALTIES: careless error, up to 30% of unpaid tax; deliberate error, up to 70% of unpaid tax; deliberate and concealed, up to 100%; interest accrues on unpaid SDLT from the due date. DISTINCTION FROM MDR (MULTIPLE DWELLINGS RELIEF): MDR (Finance Act 2003 Schedule 6B, abolished from 1 June 2024 by Spring Budget 2024) was a separate relief calculated by counting the number of dwellings and applying a per-dwelling rate; MDR was for multiple dwellings in a single transaction; mixed-use is about characterising the transaction as non-residential. MDR was abolished from 1 June 2024, mixed-use relief (s.116) was NOT abolished and remains available
Frequently asked questions
What is SDLT mixed-use property relief and how does it save money?+
SDLT mixed-use treatment (Finance Act 2003 s.116) applies non-residential SDLT rates (0%/2%/5%, no 5% additional dwelling surcharge) to a property that contains both residential and non-residential elements. This is significantly cheaper than residential additional dwelling rates (standard rates plus 5% surcharge on the entire purchase price). Example: a £500,000 additional residential dwelling pays approximately £37,500 in SDLT; the same property as mixed-use pays approximately £14,500, a saving of approximately £23,000.
What qualifies as a non-residential element for SDLT mixed-use treatment?+
Accepted non-residential elements include: agricultural land genuinely used for farming or grazing (evidenced by tenancy, grazing licence, or subsidy records); a barn or outbuilding with a current or recent history of commercial use (storage; workshop; light industry); a self-contained commercial unit (shop; office) forming part of the same purchase. A paddock may qualify if genuinely used for a commercial equestrian enterprise. A paddock used purely as ornamental grass or for the owner's personal horses does NOT qualify, HMRC treats this as residential garden.
What did the Fiander and Bower case decide about SDLT mixed-use?+
Fiander and Bower v HMRC [2021] UKUT 0156 (TC): the Upper Tribunal found that two properties, each including a paddock used for keeping horses, qualified as mixed-use for SDLT, the paddocks were used for a non-residential purpose (keeping horses) and were not 'garden or grounds' of the dwelling. HMRC subsequently increased scrutiny of paddock-based mixed-use claims and issued guidance requiring genuine commercial or agricultural use. Post-Fiander, HMRC has targeted high-volume mixed-use claim solicitors with information requests.
What are the risks of an incorrect SDLT mixed-use claim?+
An incorrect mixed-use SDLT claim exposes the buyer to: a discovery assessment by HMRC (up to 4 years for innocent error; 6 years for careless; 20 years for deliberate); penalties of up to 30% (careless), 70% (deliberate), or 100% (deliberate and concealed) of unpaid SDLT; plus interest on unpaid tax from the due date. Conveyancing solicitors have been subject to HMRC information requests relating to mixed-use claims. Always ensure genuine evidence supports any mixed-use claim before filing.