UK SDLT Additional Property Surcharge Refund Guide 2026/27

5% surcharge on residential property purchase (raised from 3% on 31 October 2024 per Autumn Budget 2024) when buyer owns another residential property at completion + new property is not replacing main residence. Common scenarios: (1) Buy-to-let purchase: surcharge applies. (2) Second home / holiday home: surcharge applies. (3) Buy new home before selling old: PAY surcharge at completion. (4) Joint buyer where one already owns property: surcharge applies on full price. Refund mechanism: If you sell previous main residence within 36 months of new purchase: refund of 5% surcharge available. Transactions before 31 October 2024: 3% rate still applies under transitional rules.

Refund process: Step 1 - Sell previous main residence within 36 months of new purchase completion. Step 2 - Apply for refund online via gov.uk/SDLT16: HMRC's online form. Step 3 - Information required: (a) Purchase details: SDLT return reference. (b) Sale details of previous main residence: completion date + price. (c) Bank account for refund. (d) Evidence of main residence usage: utility bills, council tax, electoral roll. Step 4 - HMRC processes within 30 days typical. Step 5 - Refund paid: bank transfer or cheque. Strict 36-month deadline: (a) Counts from completion of NEW purchase to completion of SALE of old residence. (b) After 36 months: refund lost entirely. (c) Can apply for refund anytime within 12 months of sale OR end of stamp duty self-assessment period.

Scenario - buy £400k new home January 2026 while still owning £300k old home: Standard SDLT: £400k purchase. SDLT bands: 0% to £125k + 2% on £125-£250k + 5% on £250-£925k = £2,500 + £7,500 = £10,000. Plus 5% surcharge: £400k × 5% = £20,000. Total SDLT paid: £30,000. Sell old £300k home September 2026: within 36 months. Refund eligible: £20,000. Net SDLT: £10,000. Apply via SDLT16 form: refund processed 30 days typical. If old home not sold by January 2029 (36 months): refund lost. £20,000 cost permanent.

Conditions for refund: (1) Previous property was your only or main residence: NOT a BTL or second home. (2) New property becomes your only or main residence: move in. (3) Sale completion within 36 months: of new purchase. (4) Both properties residential. (5) Sale at arm's length to unconnected party: typically. Evidence required: (a) Title deeds + completion statements. (b) Council tax bills: main residence status. (c) Utility bills: address as main residence. (d) Electoral roll registration. (e) HMRC notification of address change. (f) Bank statements showing primary address. Common rejection reasons: (1) Cannot prove main residence status. (2) Property was BTL not main residence. (3) Sold to connected party at undervalue: anti-avoidance scrutiny. (4) Outside 36-month window. (5) New property never became main residence: still BTL.

Divorce / separation: (1) Property transferred between spouses: typically not "sale" for surcharge purposes. Specific rules. (2) Court order property transfers: surcharge usually waived. Buying replacement during sale process: (1) Sale falls through: tight timeline. (2) 36-month clock running. (3) Multiple sale attempts may be required. Renovation periods: (1) New property uninhabitable initially: 36-month rule strict. Renovation delays don't extend. (2) Need to occupy new as main residence: temporary letting may compromise. Death of spouse: (1) Inherited property transfer rules. (2) Surcharge interactions complex. (3) Specialist solicitor essential. Multiple property owners: (1) "Replacing main residence" test strict. (2) Owning rental properties OK if main home replaced.

Strategy checklist: (1) Ideal: sell first, buy second: avoid surcharge entirely. (2) Bridge loan option: maintain main residence while purchase processes. (3) Track 36-month deadline carefully: diary + reminders. (4) Maintain evidence of main residence: bills, council tax, electoral roll. (5) Apply for refund promptly post-sale: 12-month application window. (6) SDLT16 form ready: gather documents. (7) Solicitor handles application typically: included in conveyancing service. (8) Direct application via gov.uk possible: free. (9) Specialist SDLT firms commission: typically 20-30%. Avoid if DIY possible. (10) Multi-property strategy: time purchases / sales for tax efficiency. (11) Family situation changes: divorce, death affect eligibility. (12) Documentation retention 7+ years: HMRC review window. Average refund: £5,000-£20,000 typical. Higher-value London / SE property refunds: £20,000-£50,000+.