Enter your details and click Calculate SDLT to see your total stamp duty including the 3% surcharge.
| Band | Std Rate | Add. Rate | Taxable | Tax |
|---|
For guidance only. Always verify SDLT liability with HMRC or a solicitor. Rates correct as of April 2025.
Additional Property Stamp Duty Surcharge Explained (2026)
If you are buying a second home, buy-to-let investment, or any additional property in England or Northern Ireland, you pay a 3% surcharge on top of standard SDLT rates on every band. This applies from the first pound — there is no nil-rate band for the surcharge portion.
The surcharge applies if, at the end of the transaction day, you own two or more residential properties. It does not matter whether you intend to live in the new property, rent it out, or leave it empty. The only exemptions are if you are replacing your main residence (and sell the old one within 36 months) or if the property is worth less than £40,000.
Standard vs Additional Property SDLT Rates (2026)
| Band | Standard Rate | Additional Property Rate |
|---|---|---|
| £0 – £125,000 | 0% | 3% |
| £125,001 – £250,000 | 2% | 5% |
| £250,001 – £925,000 | 5% | 8% |
| £925,001 – £1,500,000 | 10% | 13% |
| £1,500,001+ | 12% | 15% |
Additional Property SDLT Examples (2026)
| Property Price | Standard SDLT | Additional Property SDLT | Surcharge Cost |
|---|---|---|---|
| £200,000 | £1,500 | £7,500 | £6,000 |
| £300,000 | £5,000 | £14,000 | £9,000 |
| £500,000 | £15,000 | £30,000 | £15,000 |
| £750,000 | £27,500 | £50,000 | £22,500 |
The surcharge adds 3% of the total property price on top of standard SDLT. For a £500,000 BTL purchase, that is £15,000 extra.
What Changed in 2026
The 3% additional property surcharge remains unchanged for 2026. However, the standard SDLT thresholds reverted on 1 April 2025, which means the base rates the surcharge is added to have effectively increased. A £200,000 BTL purchase now costs £7,500 in total SDLT compared to £6,000 under the temporary thresholds.
The 36-month replacement window for main residence relief continues to apply. If you buy a new main home before selling your old one, you pay the surcharge upfront but can reclaim it if the old property sells within 36 months. Claims must be submitted to HMRC within 12 months of the sale or 12 months of the filing date, whichever is later.
For buy-to-let investors, mortgage interest tax relief remains restricted to the basic rate (20%) tax credit, meaning higher-rate taxpayers cannot deduct full mortgage interest from rental income. This should be factored into investment yield calculations.
Additional Property Investment Tools
Calculate the full cost of your additional property purchase:
- Rental Yield Calculator — calculate gross and net yield on a BTL investment, factoring in the 3% surcharge as an upfront cost.
- Capital Gains Tax Calculator — estimate CGT liability when you eventually sell the additional property, including annual exemption and reliefs.
- Mortgage Calculator — estimate BTL mortgage repayments including interest-only options commonly used by landlords.
- Full Stamp Duty Calculator — compare SDLT across all 4 UK nations with the surcharge applied to see which jurisdiction costs most.
- Conveyancing Calculator — estimate legal fees for the purchase, which may be higher for investment properties or leasehold flats.
✅ Surcharge rates verified against HMRC SDLT guidance, March 2026. This calculator is for guidance only. Consult a tax adviser for complex ownership structures or corporate purchases.
Worked Examples
Example 1 — £300,000 Second Home
Standard SDLT: £2,500
5% surcharge: £15,000
Total SDLT: £17,500
Example 2 — £500,000 Buy-to-Let
Standard SDLT: £12,500
5% surcharge: £25,000
Total SDLT: £37,500
Example 3 — £750,000 Holiday Let
Standard SDLT: £25,000
5% surcharge: £37,500
Total SDLT: £62,500
Common Additional Property Mistakes to Avoid
1. Assuming the surcharge only applies to buy-to-let. The 5% surcharge (increased from 3% in October 2024) applies to any additional residential property — second homes, holiday cottages, inherited properties you keep, and even properties bought for family members if you already own a home.
2. Missing the 36-month window to reclaim the surcharge. If you buy a new main residence before selling your old one, you pay the surcharge upfront but can reclaim it if the previous home sells within 36 months. Many buyers forget to submit the refund claim, which must be filed within 12 months of the sale or 12 months after the filing date — whichever is later.
3. Ignoring corporate ownership implications. If a company (including an SPV) buys a residential property above £500,000, the flat 17% SDLT rate may apply instead of the standard bands plus surcharge. For lower-value properties, the surcharge still applies and company structures do not avoid it.
4. Forgetting that the surcharge starts from £0. Unlike standard SDLT (which has a nil-rate band up to £125,000), the surcharge applies to every pound from the very first. On a £300,000 additional property, the surcharge alone adds £15,000 on top of the £3,750 standard SDLT.
5. Not considering the total tax burden on rental income. The surcharge is just the entry cost. Landlords also face income tax on rental profits, the restriction of mortgage interest relief to a 20% tax credit, potential capital gains tax on disposal, and annual mortgage payments. Model the full picture before purchasing.
5 Steps to Buying an Additional Property
- Assess your financial position and tax exposure. Calculate the total SDLT including the surcharge, expected rental yield, income tax bracket, and ongoing costs. Use a rental yield calculator to confirm the investment is cash-flow positive after all expenses.
- Secure specialist financing. Buy-to-let mortgages typically require a 25% deposit and are assessed on rental coverage (usually 125–145% of the mortgage payment). Rates in 2026 average 5.0–5.5% for 5-year fixes, higher than residential equivalents.
- Factor in the full SDLT bill. Budget for the surcharge as a non-recoverable cost (unless replacing a main residence). On a £350,000 second property, total SDLT is approximately £23,750 — that is cash needed on completion alongside your deposit.
- Complete due diligence on the property. For rental investments, check local demand, void periods, licensing requirements (HMO or selective licensing), EPC rating (minimum C required for new tenancies from 2025), and insurance requirements.
- Complete, file your SDLT return, and register with HMRC. Your solicitor files the SDLT return within 14 days. If letting the property, register as a landlord, protect any tenancy deposit in a government-approved scheme, and declare rental income via Self Assessment.
Additional Property Surcharge Rates Across the UK (2026)
Each UK nation sets its own surcharge rates for additional residential property purchases.
| Nation | Tax Name | Surcharge Rate | Total Tax on £300,000 | Total Tax on £500,000 |
|---|---|---|---|---|
| England & NI | SDLT | 5% | £18,750 | £37,500 |
| Scotland | LBTT + ADS | 8% | £28,350 | £50,100 |
| Wales | LTT + surcharge | 4% | £17,450 | £36,950 |
Scotland’s Additional Dwelling Supplement (ADS) was increased to 8% in December 2024. Wales applies a 4% higher rate on top of standard LTT bands. England’s surcharge increased from 3% to 5% on 31 October 2024.
Did You Know?
Pro Tips from the Experts
Tax advisors suggest: Timing your purchase carefully if replacing your main residence. Buy the new property first, pay the surcharge, then sell the old home within 36 months and reclaim. This avoids the stress of selling before buying while keeping your refund rights intact.
HMRC allows: A refund of the surcharge if exceptional circumstances delayed the sale of your previous home (e.g. fire, flood, or legal disputes preventing completion). Apply in writing with supporting evidence — discretionary relief is granted case by case.
Property experts advise: Considering incorporation for larger portfolios. Purchasing through a limited company allows full mortgage interest deduction against profits and corporation tax at 25% rather than income tax at up to 45%. However, the SDLT surcharge still applies and refinancing costs can be significant.
Solicitors recommend: Checking whether your purchase qualifies for the “replacement of main residence” exemption before completion. Your conveyancer can structure the SDLT return to claim the exemption upfront if you have already exchanged on the sale of your old home, avoiding the need to pay and reclaim.
Potential Savings
Surcharge Refund
£17,500 back
Sell your previous main home within 36 months and reclaim the full 5% surcharge. On a £350,000 new home, that is £17,500 refunded directly by HMRC.
Rental Income Offset
£5,400 /year
A £300,000 buy-to-let generating £1,200/month rent covers the mortgage (£750/month on a 25-year BTL fix) and yields £5,400/year net before tax — recovering the surcharge cost within 3–4 years.
Sub-£40k Exemption
£2,000 saved
Properties purchased for under £40,000 are exempt from the surcharge entirely. A £38,000 garage with planning potential pays £0 SDLT — no standard tax and no surcharge.
Frequently Asked Questions
Everything you need to know about the 3% additional property surcharge for 2025/26.