SDLT Surcharge: Calculating Your Additional Property Tax

You now pay 5 percentage points on top of normal SDLT on almost any additional residential purchase in England or Northern Ireland, and that extra 5% is charged on the entire price, not just the bit above some threshold.

"This guide provides general information about UK landlord tax obligations. It is not financial or legal advice. Tax treatment depends on your individual circumstances and may change. Consider consulting a qualified accountant or solicitor for advice specific to your situation."

1. Current SDLT rules for additional properties in 2026

Legal framework:

Higher rates sit in Finance Act 2003 Schedule 4ZA, as amended by later Finance Acts including the 2024-25 changes that raised the supplement from 3% to 5%.

HMRC rate tables from 31 October 2024 show the standard residential bands plus a 5% supplement for "higher rates transactions".

Standard residential SDLT (England and NI, 2025-26):

• 0% on up to GBP 125,000.
• 2% on GBP 125,001-250,000.
• 5% on GBP 250,001-925,000.
• 10% on GBP 925,001-1.5m.
• 12% above GBP 1.5m.

Higher rates for additional dwellings (HRAD) from 31 Oct 2024:

Take those bands and add 5% to each slice where consideration is GBP 40,000 or more.

Who is caught:

Anyone where, at the end of the day of completion, buying the new property means you own or part-own more than one residential property worldwide, and the new one is not a replacement for your only or main residence.

Companies buying any residential property almost always pay higher rates.

Minimum value:

Higher rates only apply where the "relevant consideration" for the dwelling is GBP 40,000 or more.

2. Who pays the 5% supplement and who does not

You pay the 5% supplement if:

• You are buying a major interest in a dwelling worth GBP 40,000+, and
• At the end of completion day you own another dwelling anywhere in the world, and
• You are not replacing your only or main residence under the rules in Schedule 4ZA.

You are usually exempt or can reclaim later if:

You are replacing your main residence:

• You sell your current main home and buy a new one, with the sale completing within 36 months of the purchase of the new one.
• If you have not sold your old main home by completion, you pay higher rates upfront but can claim the supplement back if you sell within 3 years.

The property is under GBP 40,000:

• No SDLT at all on a residential property below that, and the supplement does not apply.

Caravans, mobile homes, and houseboats:

• Not charged SDLT for most standard transactions, so no higher-rates issue.

First-time buyer relief:

• Not available if you (or your spouse/partner) already own or part-own another residential property.
• For landlords, by definition if you already own a BTL, you do not qualify for FTB relief on a new purchase.

3. Worked SDLT examples at 2025-26 higher rates

Using the higher-rates bands above.

A. GBP 150,000 second property

• First GBP 125,000 at 5% = GBP 6,250.
• Remaining GBP 25,000 at 7% = GBP 1,750.
• Total higher-rates SDLT = GBP 8,000.

B. GBP 250,000 second property

• First GBP 125,000 at 5% = GBP 6,250.
• Next GBP 125,000 at 7% = GBP 8,750.
• Total = GBP 15,000.

C. GBP 400,000 second property

• First GBP 125,000 at 5% = GBP 6,250.
• Next GBP 125,000 at 7% = GBP 8,750.
• Remaining GBP 150,000 (from 250k to 400k) at 10% = GBP 15,000.
• Total = GBP 30,000.

D. GBP 600,000 second property

• First GBP 125,000 at 5% = GBP 6,250.
• Next GBP 125,000 at 7% = GBP 8,750.
• Next GBP 350,000 (250k-600k) at 10% = GBP 35,000.
• Total = GBP 50,000.

4. Multiple dwellings relief, mixed-use, and linked transactions

Multiple Dwellings Relief (MDR)

MDR, which let you average the price per dwelling for SDLT, was abolished for most transactions from 1 June 2024 under Autumn Budget 2023 measures.

There remain limited exceptions (eg certain social housing cases), but most landlord bulk purchases of flats/houses can no longer use MDR.

Mixed-use relief

Buying a mixed-use property (residential + non-residential, eg shop with flat above) is still charged at non-residential SDLT rates, with no 5% supplement.

HMRC has increased scrutiny of "fake mixed-use" arrangements where a tiny yard or nominal licence is used to claim non-residential rates; guidance and case law make clear that there must be genuine non-residential use.

Linked transactions

If you buy multiple properties from the same seller, or under connected arrangements, within a linked time frame, SDLT can treat them as linked transactions -- aggregating consideration for rate bands.

You then apply the higher-rates bands to the total price, not each property separately, which can push more of the combined price into higher slices.

Forums often miss this: clever "split completions" and multiple contracts can still be linked under Schedule 4ZA and general SDLT rules.

5. Scotland and Wales: LBTT / LTT equivalents

If you invest across the border:

Scotland -- LBTT and ADS:

• Scotland charges Land and Buildings Transaction Tax (LBTT) instead of SDLT.
• Additional properties pay Additional Dwelling Supplement (ADS) of 8% of the full purchase price for transactions on or after 5 December 2024.
• ADS is in addition to standard LBTT bands set by Revenue Scotland.

Wales -- LTT higher rates:

• Wales charges Land Transaction Tax (LTT) with specific higher rates for additional residential properties.
• Surcharges are higher than original 3% SDLT and vary by band; the pattern is similar (higher percentages on each slice, more punitive at the mid-range).

In all three nations, the policy direction is to make extra dwellings meaningfully more expensive at purchase, not just by a token amount.

6. Classic SDLT mistakes and forum myths

Mistakes landlords make

Assuming the surcharge only applies if it is a "buy-to-let" The 5% supplement applies to any additional dwelling -- even if you plan to live in it but have not sold your previous home by completion.

Not realising a tiny inherited share counts If you own any interest in another dwelling worth GBP 40,000+ (eg a 25% inherited share of a house), you can trigger higher rates on a new purchase, unless you are replacing your main home.

Missing the 36-month reclaim window Pay higher-rates on a new main residence, then forget to reclaim the supplement when you sell the old main home. Claims must be made within set time limits.

Counting holiday caravans/boats as dwellings For SDLT they usually are not "dwellings", so do not trigger higher-rates; some investors incorrectly assume they do and overpay.

Getting linked-transactions wrong on block purchases Planning as if each flat stands alone for bands, when Schedule 4ZA and general SDLT rules aggregate the prices, leading to under-provision for SDLT.

Forum myths

"If the new place will be your main home, you never pay the surcharge." Wrong: you do pay if you have not sold the old main home by completion; you only avoid higher-rates or reclaim later if the old main home is sold within 36 months.

"You can avoid the surcharge by putting the new property in your spouse's name." Wrong: Schedule 4ZA treats spouses and civil partners living together as one unit. HMRC look at combined property ownership.

"Mixed-use always gets you out of the surcharge." Only if there is genuine non-residential use. HMRC challenge contrived structures. If you have two flats over a "store room" that is really part of the residence, expect scrutiny.

"The extra 5% only applies above GBP 250k." It applies to every relevant slice; on a GBP 150k second property you still pay 5% on the first GBP 125k and 7% on the next band, giving GBP 8,000 total.

For any deal now, you should be running an SDLT line in your spreadsheet as aggressively as you model interest coverage. On a GBP 400k or 600k purchase, the extra 2 percentage points introduced in 2024-25 alone are worth GBP 8-15k versus the old 3% uplift.

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