Stamp Duty Land Tax (SDLT) on buy-to-let and limited company purchases of residential property in England and Northern Ireland combines the standard residential bands with a 5% additional dwellings surcharge. Two changes since the start of 2025 mean even small portfolio additions are now meaningfully more expensive than they were a year ago: the temporary £250,000 nil-rate band ended on 1 April 2025 (reverting to £125,000), and the additional dwellings surcharge increased from 3% to 5% on 31 October 2024.
This guide sets out the current SDLT position for landlords and limited companies, walks through the calculation at common purchase prices, and covers the reliefs and edge cases that come up most often in our work with portfolio investors.
Standard residential SDLT rates from 1 April 2025
The standard residential SDLT bands, before any surcharge, are the rates a private buyer would pay on their only home. They form the base layer of every residential SDLT calculation in England and Northern Ireland.
| Portion of price | Standard rate |
|---|---|
| Up to £125,000 | 0% |
| £125,001 to £250,000 | 2% |
| £250,001 to £925,000 | 5% |
| £925,001 to £1,500,000 | 10% |
| Above £1,500,000 | 12% |
These are slice-rate (marginal) bands. The percentage in each row applies only to the part of the price that falls within that band. The full statutory schedule sits in section 55 of the Finance Act 2003, and the official rates page is on gov.uk.
The 5% additional dwellings surcharge (HRAD)
The Higher Rates for Additional Dwellings (HRAD) surcharge applies a flat extra 5 percentage points on top of every band, charged on the full purchase price (not just the slice above £40,000). It applies when the buyer ends the day of completion owning two or more residential properties and is not simply replacing a main residence.
| Portion of price | Standard rate | + HRAD surcharge | Effective rate |
|---|---|---|---|
| Up to £125,000 | 0% | 5% | 5% |
| £125,001 to £250,000 | 2% | 5% | 7% |
| £250,001 to £925,000 | 5% | 5% | 10% |
| £925,001 to £1,500,000 | 10% | 5% | 15% |
| Above £1,500,000 | 12% | 5% | 17% |
A limited company always pays the higher rates on residential acquisitions, regardless of whether the company already owns other residential property. The replacement of main residence carve-out is only available to individuals and is not open to corporate buyers. The statutory framework sits in Schedule 4ZA to the Finance Act 2003.
Worked examples at common buy-to-let price points
The maths is easiest to see with a worked example at each band. The figures below are for England and Northern Ireland and assume the buyer (whether an individual landlord or a limited company) is subject to the 5% HRAD surcharge.
| Purchase price | Standard SDLT | 5% HRAD surcharge | Total SDLT |
|---|---|---|---|
| £150,000 | £500 | £7,500 | £8,000 |
| £200,000 | £1,500 | £10,000 | £11,500 |
| £250,000 | £2,500 | £12,500 | £15,000 |
| £300,000 | £5,000 | £15,000 | £20,000 |
| £400,000 | £10,000 | £20,000 | £30,000 |
| £500,000 | £15,000 | £25,000 | £40,000 |
| £750,000 | £27,500 | £37,500 | £65,000 |
| £1,000,000 | £43,750 | £50,000 | £93,750 |
Two patterns stand out. At lower price points, the HRAD surcharge is the dominant cost, often dwarfing the standard SDLT bill. Above roughly £400,000 the standard rates start to bite harder because the 5% band is engaged. Either way, the headline yield on a buy-to-let needs to comfortably cover the SDLT amortised over a realistic holding period before financing and operating costs.
Non-UK resident: a further 2% on top
A 2% non-resident surcharge applies to residential purchases by buyers who are not UK-resident for SDLT purposes. It sits on top of both the standard rates and the 5% HRAD surcharge, so the effective top-band rate for a non-UK resident company on additional residential property is 19%.
The residence test is not the same as the corporation tax test. For SDLT, an individual is non-resident if they have not been present in the UK on 183 days in the 12 months ending on the effective date of the transaction. A company is treated as non-resident if it is non-UK resident for corporation tax, or if it is a close company controlled by one or more non-UK resident participators. UK incorporation does not automatically deliver UK residence for these purposes. The detail is in Schedule 9A to the Finance Act 2003.
If an individual buyer subsequently meets the 183-day test in the 12 months after completion, they can reclaim the 2% surcharge through HMRC's online service. This does not apply to companies.
Six or more dwellings: automatic non-residential treatment
One of the few genuinely useful SDLT planning levers for portfolio investors is the rule at s.116(7) FA 2003: where six or more separate dwellings are the subject of a single transaction, the dwellings are automatically deemed not to be residential property for SDLT. The non-residential bands then apply and no HRAD surcharge is due. This is a statutory deeming, not an election; the buyer reports on the non-residential basis and no claim mechanism is required.
| Portion of price | Non-residential rate |
|---|---|
| Up to £150,000 | 0% |
| £150,001 to £250,000 | 2% |
| Above £250,000 | 5% |
On a £1.2 million portfolio of six flats bought from a single seller in one transaction, the residential-with-HRAD route would cost roughly £125,000 in SDLT, whereas the automatic non-residential treatment caps the bill at around £49,500. The saving is substantial enough that "deal stacking" (combining smaller deals into a single SPA) is sometimes worthwhile for serious portfolio buyers, though it needs to be commercially genuine and not a contrived structure.
Multiple Dwellings Relief, which previously offered an alternative averaging mechanism, was abolished for transactions with an effective date on or after 1 June 2024. The s.116(7) six-dwellings rule is now the principal portfolio-friendly route.
Replacement of main residence: the individual landlord lever
An individual landlord who is moving home and keeping a previous main residence as a let property can sometimes structure the timing to soften the SDLT impact. There are two routes.
- Sell first, buy second. If the previous main home is sold before the new home completes, the new purchase is treated as a replacement of main residence and the 5% surcharge does not apply at all, even though the buyer may still own other rental properties.
- Buy first, sell within 36 months. If the buyer cannot sell the previous home first, the 5% surcharge is paid on the new purchase but can be reclaimed in full if the previous main home is sold within 36 months of the new purchase. The reclaim is filed online and must be submitted within 12 months of the sale.
This pair of rules is the only meaningful route by which someone who already owns rental property can avoid the surcharge on a purchase, and it is only open to individuals (not companies). For pure buy-to-let purchases, where neither the new nor the old property is a main residence, the surcharge is unavoidable.
First-time buyer relief: not for landlords or companies
First-time buyer relief gives a 0% rate on the first £300,000 of a qualifying purchase and 5% on the portion between £300,001 and £500,000, with no relief at all if the purchase price exceeds £500,000. The temporary higher thresholds of £425,000 and £625,000 that applied between September 2022 and 31 March 2025 are no longer available.
The relief is only available to individuals buying a property as their only or main home, where they (and any joint purchasers) have never previously owned a residential property anywhere in the world. Limited companies cannot claim it, and an individual buying a buy-to-let cannot claim it because the purchase is not their main residence.
Mixed-use, uninhabitable and other "off-grid" arguments
A small but persistent share of SDLT planning revolves around taking a transaction outside the residential rates altogether. Two patterns come up repeatedly.
- Mixed-use property. A genuine mixed-use property (a shop with a flat above bought as one transaction, a farmhouse with substantial grazing land) attracts the non-residential SDLT rates and no HRAD surcharge. HMRC has tightened its position significantly in the last few years and now looks for the commercial element to be substantial, in use and capable of standing on its own commercial footing. Token commercial leases attached to otherwise residential properties to access the rates are routinely challenged.
- Uninhabitable property. Some buyers argue a derelict building is not "suitable for use as a dwelling" and so should be taxed at non-residential rates. The leading case (P N Bewley Ltd v HMRC) succeeded on extreme facts, including asbestos and a collapsed roof. Cosmetic disrepair, missing kitchens or bathrooms, or properties needing modernisation do not meet the bar.
Where one of these arguments is genuinely available, the SDLT saving can be enormous. Where it is borderline or contrived, the eventual cost (full residential rates, HRAD surcharge, interest and penalties) usually exceeds the saving by a wide margin.
ATED: the ongoing charge for company-held residential property
Limited companies owning UK residential property valued over £500,000 fall within the Annual Tax on Enveloped Dwellings (ATED) regime. ATED is a flat-rate annual charge based on banded property values and is wholly separate from SDLT. For 2026/27 the bottom band charge is around £4,500 a year and the charge rises through six bands to over £290,000 for properties valued above £20 million.
For most portfolio landlords, ATED is administrative rather than substantive: a company holding residential property as part of a genuine property rental business open to third parties on a commercial basis can claim the property letting relief and file a nil return. The return is still required, by 30 April each year, and missing the deadline triggers automatic penalties even where no tax is owed. The detail is on gov.uk.
Scotland and Wales: different tax, different rates
SDLT does not apply in Scotland or Wales. Investors buying north or west of the border deal with separate devolved taxes.
- Scotland: Land and Buildings Transaction Tax (LBTT). LBTT has its own banded schedule and an Additional Dwelling Supplement (ADS) of 8% since 5 December 2024 (previously 6%). The ADS applies on the full purchase price, similar to SDLT's HRAD surcharge.
- Wales: Land Transaction Tax (LTT). LTT has a separate higher residential rates schedule for additional dwellings, with surcharges built into each band rather than applied as a flat top-up. The Welsh schedule is set by the Welsh Government and is updated more often than SDLT, so it pays to check the current schedule before exchange.
The differential matters for investors who are flexible on location. Identical headline yields in similar regional markets can produce materially different acquisition costs depending on which side of the border the property sits.
Filing, payment, penalties and interest
The SDLT return (SDLT1) must be filed and the tax paid within 14 days of the effective date of the transaction. The effective date is normally the completion date, though substantial performance (the buyer taking possession or paying most of the price) can bring it forward.
- Late filing: £100 fixed penalty up to three months late, rising to £200, with potential tax-geared penalties beyond.
- Late payment: daily interest at HMRC's published rate from day 15, a 5% surcharge if the tax is more than 30 days overdue, and a further 5% surcharge at 6 months and 12 months.
- Reclaims: overpaid SDLT can be reclaimed online (most commonly the 5% surcharge after sale of a former main residence), generally within 12 months of the relevant trigger.
HMRC publishes the current interest rate at gov.uk/hmrc-interest-rates. The rate moves with the Bank of England base rate plus a margin and has been at elevated levels throughout 2024/25 and into 2026.
Calculating it yourself, and where the calculator falls short
HMRC's SDLT calculator is the safest starting point for a straightforward purchase. It correctly applies the standard bands, the 5% HRAD surcharge and the 2% non-resident surcharge for clean cases.
Where it stops being reliable is for any non-standard transaction: linked transactions, sub-sales, grant of new leases over residential property, parts of mixed-use sites, packages of six or more dwellings, and any case involving a partnership or trust. In each of those cases the bands and surcharges interact in ways the calculator does not handle, and underpaying SDLT on the strength of the calculator output is not a defence against penalties. A property tax specialist should sense-check anything outside the straightforward "individual or company buys one residential property" pattern.
How SDLT shapes the overall buy-to-let decision
SDLT is upfront and visible, which makes it easy to over-weight in the buying decision. The bigger factors over a 10 to 20 year holding period are usually the annual income tax position (heavily affected by Section 24 for higher-rate personal landlords), the exit CGT position (covered in our CGT on UK property guide) and, for portfolio holders, the inheritance tax position.
The case for buying through a limited company rarely turns on SDLT, because both routes pay the surcharge. It usually turns on whether the higher-rate income tax saving from full mortgage interest deduction inside the company, compounded over the holding period, exceeds the additional friction (corporation tax, dividend tax on extraction, accountancy and filing costs). Modelling both routes for a specific property and a specific investor profile is the only way to answer it properly.
Compliance through ownership and on exit, including Making Tax Digital for Income Tax (live from 6 April 2026 for sole-trader landlords above £50,000), is part of the same picture and should be factored into the buy decision rather than treated as a downstream worry.