How the 5% Surcharge Affects Second Home Buyers and Landlords

The Surcharge Increase: 3% to 5%

The additional dwelling surcharge on stamp duty rose from 3% to 5% on 31 October 2024 — the largest proportional increase since the surcharge was first introduced in 2016. For second home buyers and buy-to-let landlords in England and Northern Ireland, this represented an immediate 67% rise in the surcharge component of their stamp duty bill. See our second home complete guide for everything you need to know about buying an additional property.

Then came a second blow. From 1 April 2025, the standard nil-rate threshold for all buyers dropped from £250,000 to £125,000. Because the surcharge is applied on top of standard rates across every band, reducing the nil-rate threshold also increases the stamp duty owed by additional property buyers. A buyer purchasing at £200,000 now pays 5% on the full £200,000, rather than paying nothing on the first £250,000 under the old surcharge bands. Note that buyers who pay the surcharge while waiting to sell a previous main residence may be eligible for a refund — see the replacement main residence rules.

The current additional property rates in England, effective from April 2025, are:

For comparison, before October 2024 the surcharge was 3%, and the nil-rate band was £250,000. The rate on the £0–£250,000 band for additional properties was therefore 3%, the £250,001–£925,000 band was 8%, and so on. See the full before-and-after cost breakdown in the section below. For more on the broader April changes, read our April 2025 stamp duty changes guide.

Cost Increase by Property Price

The table below shows the stamp duty payable on an additional property (second home or buy-to-let) under the old rates versus the current rates. All figures use England SDLT calculations. The "Before" column reflects rates before October 2024 (3% surcharge, £250k nil rate). The "After" column reflects current rates from April 2025 (5% surcharge, £125k nil rate).

Use our second home stamp duty calculator to get an exact figure for any purchase price. The buy-to-let calculator also lets you model the impact of stamp duty on your projected rental returns.

Impact on Buy-to-Let Yields

Stamp duty is an upfront purchase cost, not an ongoing expense, but it directly erodes the effective yield a landlord can achieve because it inflates the total capital deployed into the investment. The worked examples below show a typical BTL scenario at a £300,000 purchase price with £15,000 per year in gross rental income (a 5% gross yield on price).

The effective yield drops from 4.82% to 4.69% — a reduction of 13 basis points on this property. On a highly leveraged investment where mortgage interest is also a cost, this compression can push an investment from marginally profitable to loss-making. In higher-value markets such as London, where yields are already compressed to 3–4%, the additional stamp duty burden can be particularly difficult to absorb.

To run your own numbers, use our buy-to-let stamp duty calculator alongside our rental yield calculator, which factors total acquisition costs including stamp duty into the yield calculation.

Comparison Across the UK

The additional dwelling supplement varies significantly across the UK's three property tax systems. England's 5% surcharge is applied on top of standard SDLT bands. Scotland and Wales operate distinct structures, and in some scenarios the Scottish approach produces a higher tax bill despite a simpler rate structure.

Impact on Portfolio Landlords

Portfolio landlords — typically defined by lenders as those owning four or more mortgaged rental properties — face compounding stamp duty costs each time they add to their portfolio. Unlike income tax or capital gains tax, SDLT is an upfront cost that cannot be deferred or spread. With the surcharge now at 5%, building a meaningful rental portfolio requires significantly more upfront capital than it did two years ago.

A landlord building the same five-property portfolio today faces £34,000 more in stamp duty than they would have before October 2024. Spread across the portfolio, this erodes the initial equity position in each property and reduces the scope for further borrowing against the portfolio. Many smaller landlords have reported that the combination of higher SDLT, the removal of mortgage interest relief, and tighter lending criteria has made further portfolio expansion unviable.

Holiday Let and Airbnb Impact

Short-term rental properties — whether listed on Airbnb, Vrbo, or operated independently as furnished holiday lets (FHLs) — are treated as additional dwellings for SDLT purposes. A buyer purchasing a Cornish cottage or Lake District farmhouse as a holiday let investment pays the full 5% surcharge on top of standard SDLT, just as a long-term landlord would.

The economics of a holiday let investment now need to be assessed on pure yield grounds, without the previous tax wrapper benefits. A coastal property purchased for £400,000 now attracts £30,000 in stamp duty (up from £19,500 before October 2024). With typical holiday let gross yields in popular UK destinations running at 6–10%, the higher upfront cost still allows for viable returns, but the margin of safety has thinned considerably.

Local authorities in many popular holiday destinations have also introduced or extended Article 4 directions restricting short-term rental conversions, adding planning risk to the investment picture. Prospective holiday let buyers should model total acquisition costs carefully using our second home calculator before committing.

Market Transaction Trends

The combination of the 2022 mortgage rate shock, the 2024 surcharge increase, and the 2025 nil-rate threshold reduction has had a measurable effect on the buy-to-let market. HMRC transaction data shows additional dwelling purchases declining as a share of total residential transactions, with landlord numbers falling for the first time since records began.

The net effect of these changes has been a structural shift away from the small private landlord model towards larger, corporatised landlords and purpose-built rental developments. Whether this produces better outcomes for tenants in terms of quality and security of tenure remains debated, but the tax environment has clearly reshaped the investor pool. Read more about how the changes affect the broader market in our complete April 2025 changes guide.

Frequently Asked Questions