Stamp Duty on Buy-to-Let Properties

# Stamp Duty on Buy-to-Let Properties

Stamp Duty Land Tax (SDLT) is the biggest single tax on a buy-to-let purchase. The surcharge on additional dwellings, hiked to 5% in October 2024, materially affects deal economics.

The headline structure

Two layers of SDLT apply:

1. Standard residential rates — banded.
2. Additional dwellings surcharge — flat 5% on the full price.

Standard residential SDLT (England & NI)

(Thresholds from 1 April 2025. First-time buyer relief is separate and does not apply to investment purchases.)

The additional dwellings surcharge

Buy-to-let triggers an extra 5% on the entire purchase price (not just the slice above a threshold).

When it applies

• You already own another residential property (anywhere in the world).
• The purchase is not a replacement of your main residence.
• The price is £40,000 or more.
• Purchased as an individual, company, partnership or trust.

When it does NOT apply

• You own no other residential property.
• You are replacing your main residence (sold within 36 months of purchase — or refundable if sold after).
• The property costs under £40,000.
• The property is a "moveable" structure (some caravans, houseboats).
• Mixed-use property qualifies for commercial rates (non-residential SDLT scale).

Worked example — £300,000 BTL

Standard SDLT:

• £0–£125k = £0
• £125–250k = £2,500
• £250–300k = £2,500
• Standard total: £5,000

Surcharge: 5% × £300,000 = £15,000

Total SDLT: £20,000 (6.7% effective).

Companies (SPVs)

Limited companies pay:

• Standard residential rates AND
• 5% surcharge on every purchase, regardless of whether the company owns other property.
• For corporate purchases over £500,000, the 15% punitive rate may apply unless the property is let to unconnected tenants (the most common exemption).

There is no £40,000 minimum for companies — they pay the surcharge from £1.

Refund — 36-month window

If you bought a new main residence before selling the old one (paying the surcharge), you can reclaim the surcharge if you sell the old main residence within 36 months of the new purchase. Claim via HMRC SDLT refund form within 12 months of the sale or 12 months of the SDLT filing deadline, whichever is later.

Multiple Dwellings Relief (MDR)

Abolished from 1 June 2024. Was previously useful for portfolio purchases and properties with annexes. No longer available except for transactions where contracts were exchanged before that date.

Mixed-use and non-residential rates

Property with both residential and commercial elements (e.g. flat above a shop bought together) is charged at non-residential rates:

No surcharge applies. HMRC scrutinises mixed-use claims heavily; the commercial element must be genuine and material.

Scotland and Wales

• Scotland (LBTT + ADS): ADS is 8% (raised December 2024). Different bands.
• Wales (LTT): higher residential rate adds 4–5% depending on band.

This article focuses on England and Northern Ireland (SDLT).

Timing and process

• SDLT return filed within 14 days of completion.
• Payment due within the same window.
• Solicitor usually files and pays on completion day.
• Penalties for late filing/payment apply.

Planning options

• Buy in personal name if it is your only property (no surcharge).
• Replace main residence (no surcharge, with 36-month rule).
• Buy in spouse''s sole name if they have no other property — but anti-avoidance rules treat spouses as one unit.
• Limited company — surcharge always applies but tax efficiency on income can compensate over time.
• Mixed-use — only if genuinely mixed; HMRC will challenge.

Common mistakes

• Forgetting an overseas property triggers the surcharge.
• Assuming Multiple Dwellings Relief still exists (abolished June 2024).
• Missing the 36-month refund window after selling old main residence.
• Treating spouses as separate for surcharge purposes (HMRC treats as one).
• Underestimating SDLT impact on yield calculations.

Bottom line

The 5% surcharge changes BTL deal maths materially. A £300k purchase carries £20k SDLT — 6.7% of price gone before any rent comes in. Build it into yield models from day one; check refund eligibility on every transaction; and treat mixed-use claims with caution.