For a Harrow property investor, SDLT is typically the second-largest cost on the day after the deposit. A £600,000 second home attracts £33,500 of SDLT (£15,500 standard plus £18,000 surcharge). The reliefs and the rate-band structure carry significant planning value, particularly for portfolio buyers and mixed-use acquisitions.
The 2024 Spring Budget abolished Multiple Dwellings Relief from 1 June 2024, the additional-dwelling surcharge rose to 5% from 31 October 2024, the 2% non-resident surcharge has bedded in, and HMRC has ramped up enforcement on the uninhabitable-property and mixed-use boundary. This is the 2026 SDLT landscape.
2026 SDLT rates and bands
SDLT rates for residential property (April 2025+)
| Band | Standard rate | Additional dwelling rate | Non-resident surcharge |
|---|---|---|---|
| Up to £125,000 | 0% | 5% | +2% |
| £125,001-£250,000 | 2% | 7% | +2% |
| £250,001-£925,000 | 5% | 10% | +2% |
| £925,001-£1.5m | 10% | 15% | +2% |
| Over £1.5m | 12% | 17% | +2% |
The 3% additional-dwelling surcharge introduced in 2016 rose to 5% for completions from 31 October 2024 (Autumn Budget 2024). The non-resident surcharge of 2% (introduced 2021) layers on top. A company buying a home for more than £500,000 pays a flat 17% on the whole price unless a relief applies, such as the relief for a genuine property rental business.
Multiple Dwellings Relief post-2024
Multiple Dwellings Relief ended for completions from 1 June 2024:
- MDR was abolished for transactions completing on or after 1 June 2024, with transitional protection only for contracts exchanged on or before 6 March 2024.
- Six-or-more transactions can still elect non-residential treatment (a meaningful saving).
- Annexes, granny flats and "two-property" claims (which had been a popular MDR tool) are largely closed off.
- Transitional provisions apply to contracts exchanged before 1 June 2024, but most claims now require the 6+ threshold.
HMRC has retroactively challenged MDR claims
Pre-2024 MDR claims involving annexes have been the subject of HMRC enquiry and claim withdrawal. Where MDR has been claimed in the last four years on borderline grounds, expect scrutiny.
Mixed-use properties and commercial rates
Where a property has a meaningful non-residential element (a shop with flat above, a farm with farmhouse, a B&B with owner accommodation), commercial SDLT rates can apply to the whole transaction:
Non-residential and mixed-use SDLT (apportioned)
| Band | Rate |
|---|---|
| Up to £150,000 | 0% |
| £150,001-£250,000 | 2% |
| Over £250,000 | 5% |
For a £750,000 mixed-use property with a clear commercial element, mixed-use SDLT is approximately £29,500 vs £40,000+ residential plus surcharges. The "meaningful commercial element" test has tightened: HMRC scrutinises pure-cosmetic commercial framing (a token cafe addressed to the same building) and looks for substantive trading activity.
The 2% non-UK-resident surcharge
Buyers who have not been UK-resident for 183+ days in the 12 months before completion pay an additional 2% on every band of residential property purchased. The mechanics:
- The test is the buyer's residence in the 12 months before completion, not citizenship or domicile.
- Joint buyers are tested individually; if any joint buyer is non-resident, the surcharge applies to the whole transaction.
- Companies (UK or foreign) controlled by non-residents are tested; UK-incorporated companies with non-resident shareholders can attract the surcharge.
- Trusts and partnerships have their own residence-testing rules.
- A reclaim is available where the buyer becomes UK-resident in the year following completion (183+ days within 365 days of completion).
The SDLT Strategy Series
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Equity transfer between spouses
Inter-spouse transfers of property typically qualify for the connected-persons SDLT exemption where there is no chargeable consideration:
- A gift of beneficial ownership between spouses with no consideration: zero SDLT.
- A transfer where the receiving spouse takes on a portion of the mortgage: SDLT applies on the assumed mortgage debt as consideration.
- A transfer between spouses with a third-party refinance covering the assumed debt: SDLT applies on the consideration represented by the assumption.
- For a £400,000 property with a £250,000 mortgage where 50% transfers, the assumed debt is £125,000 and is the SDLT consideration.
Reclaiming the 5% surcharge: the 3-year rule
Where a buyer pays the additional-dwelling surcharge on a replacement main residence purchase, the surcharge is recoverable if the previous main residence is sold within 3 years of completion:
- 1On purchase of the new main residence, pay the surcharge upfront (cash flow hit).
- 2Sell the previous main residence within 3 years.
- 3Apply for refund within 12 months of selling the previous main residence (or 12 months after the surcharge return, whichever is later).
- 4HMRC processes the refund within 6-12 weeks; interest is added.
For a typical £25,000-£35,000 surcharge in Harrow, the refund mechanism saves the cash but costs the time-value of money. Time the move to minimise the bridging period.
Buying derelict or uninhabitable properties
A property that is genuinely uninhabitable at completion may qualify for non-residential SDLT rates rather than the residential surcharge:
- The property must be genuinely incapable of being used as a dwelling at the moment of completion (no functioning kitchen, bathroom, plumbing, electrics, or having sustained material structural damage).
- Cosmetic disrepair (damp, peeling paint, dated kitchen) is insufficient.
- HMRC tightened guidance in 2022-2024; a building survey at completion confirming uninhabitability is critical evidence.
- Where successfully claimed, savings on a £400k Harrow renovation project can run £25,000-£35,000.
Buying a Harrow investment property in 2026?
A specialist landlord accountant pre-models SDLT, identifies relief eligibility, and times the transaction to minimise total cost.