Last updated: 1 May 2026

Reviewed by: Editorial Team

How much extra SDLT on a second home or buy-to-let?

This guide explains why additional dwellings — second homes, holiday lets, buy-to-let flats, and many purchases completed while you still own another residential property — attract higher property taxes than a simple main-residence move. The article stays focused on that surcharge layer so it does not repeat the full baseline rate tables from our SDLT rates page. Use the homepage calculator's Additional Property tab for England and Northern Ireland numbers, the LBTT tool for Scotland (including ADS), and the LTT tool for Wales.

Policy intent in one sentence

Governments use surcharges to cool investor demand and raise revenue from people who already have a foothold on the housing ladder. Whether you agree with the policy or not, the cash impact is real at completion — budget it before you bid.

England and Northern Ireland: additional-property SDLT

Additional-property purchases use a higher percentage in each band than ordinary moving-home purchases. There are also specific rules at lower prices: transactions under £40,000 may be exempt, while between £40,001 and £125,000 you can pay 5% on the entire price rather than only the slice in that band — a mechanic that surprises people who expect pure "slice" maths everywhere. Our SDLT calculator encodes those edges so you are not caught using a back-of-envelope percentage.

Scotland: LBTT plus Additional Dwelling Supplement

Scotland charges LBTT on the purchase using Scottish bands, then may add Additional Dwelling Supplement (ADS) on relevant additional-dwelling acquisitions — currently 8% on the portion above £40,000 in scope, on top of the standard LBTT. The interaction is not the same as simply raising each English band by a flat spread. Investors comparing Edinburgh with Newcastle should model both jurisdictions explicitly rather than mentally "adding three percent" to an English guess.

Wales: LTT additional-property rates

Welsh LTT uses its own schedule for additional property, including particular treatment around the lower price range (for example behaviour between £40,000 and £180,000 differs from England). Again, use the Welsh calculator rather than importing English assumptions.

When you temporarily own two homes

People moving house often complete the new purchase while still owning the old one, paying higher rates at that moment. If you later sell the previous main residence within the permitted window, you may reclaim the difference — that story belongs in our stamp duty refund guide, which explains timing and evidence so this page stays on the initial surcharge mechanics.

Holiday lets and furnished investments

Tax treatment for income tax or business rates is a different department from SDLT at purchase. For SDLT, what usually matters is whether the dwelling counts as residential and whether the purchase falls in the additional-property rules. Do not assume that calling a property a "business" automatically removes residential land taxes — structures vary and mistakes are expensive.

Companies and SPVs

Corporate buyers face their own SDLT considerations (including historical surcharges on certain acquisitions) that a retail calculator may not model. If you buy through a limited company, treat online estimates as non-binding and involve a tax adviser from day one.

Mortgage stress tests and rental yield

Lenders look at interest cover and portfolio stress; you should layer SDLT, LBTT or LTT into your breakeven rent and void assumptions. A deal that works on gross yield can fail once the upfront tax is amortised across your holding period. Running multiple price points through the additional-property mode of the calculator helps you see where stepping £5,000 on price moves tax disproportionately because of band jumps.

Renovation projects and uninhabitable properties

Sometimes buyers hope that a derelict building or a barn conversion site will be taxed under non-residential or mixed rules. Whether that works depends on facts — use, planning status, and what is being transferred. Getting this wrong can mean paying too little tax and facing a bill later, or budgeting too much and over-paying upfront. Early conversation with your conveyancer and, where appropriate, a surveyor reduces guesswork.

Portfolio landlords and simultaneous purchases

If you complete two buys in the same ownership group within a short window, the order can affect which counts as additional. Portfolio spreadsheets should include not only mortgage balances but also expected land tax per completion date so cash does not run dry on the second transaction.

Due diligence checklist

• List every residential property any buyer will own at completion.
• Identify whether the new purchase is main home, let, or occasional use.
• Model both "mover" and "additional" if your chain might slip.
• If a refund might follow a later sale, diary the statutory windows early.

Talking to sellers and agents

Estate agents sometimes quote "stamp duty included" incentives on new builds. Read whether that is a genuine price adjustment or a separate contribution; SDLT is calculated on chargeable consideration as defined for tax, not on marketing labels. If an incentive is tied to carpets or removable chattels, it may not reduce land tax the way you hope.

Tax law changes. Confirm ADS percentages, Welsh thresholds and SDLT surcharges against official sources at completion.