Second Home Stamp Duty: The +5% Surcharge Explained

Whether you're buying a second home, a buy-to-let, a holiday home, or even helping a child buy by joining them on the deeds, the additional property surcharge on Stamp Duty Land Tax (SDLT) can add tens of thousands to your bill. The surcharge sits on TOP of normal SDLT, and on a £400,000 property in 2026, that's an extra £20,000 you wouldn't pay if it was your only home. Here's how it actually works.

The 5% surcharge, what triggers it

Since the surcharge was increased from 3% to 5% in late 2024, anyone buying a residential property where they already own another property must pay 5% on top of standard SDLT rates. The trigger applies when ALL of the following are true:

• You already own another residential property anywhere in the world.
• The purchase price is £40,000 or more (sub-£40k purchases are surcharge-exempt).
• The property is residential (commercial property has separate SDLT rules).
• The new property is not replacing your main home (if it is, exemption applies, see below).

How the maths actually works

The surcharge is 5% added to EVERY SDLT band, not just the top one. On a £400,000 second home (England, 2026):

• Standard SDLT: 0% to £125k = £0; 2% on £125k-250k = £2,500; 5% on £250k-400k = £7,500. Total standard SDLT = £10,000.
• Surcharge: 5% of the entire £400,000 = £20,000.
• Total payable: £10,000 + £20,000 = £30,000.
• Compare with £10,000 if this were your only home. The surcharge triples the bill on this purchase.

The 'replacing your main home' exemption

If you're replacing your main residence, selling one and buying another simultaneously, the surcharge doesn't apply, even if you briefly own two properties during the transition.

The detail: if you complete the new purchase before selling the old main residence, you initially pay the surcharge (treated as a second home temporarily). When you sell the old home within 36 months of buying the new one, you can reclaim the surcharge from HMRC. This is one of the most-missed reclaims; many buyers don't realise it's available.

Buy-to-let purchases, surcharge applies

Pretty much all BTL purchases attract the surcharge, because BTLs are by definition additional residential properties not your main home. Exceptions:

• Your first BTL where you also rent your main home, surcharge does NOT apply because you don't already own any property.
• Six or more residential properties in a single transaction, can opt for non-residential SDLT rates instead (often much cheaper).
• Companies buying residential property face the surcharge plus often the 15% flat rate on properties over £500,000.

Joint purchases and the 'one owns another' rule

If joint buyers include even ONE party who already owns another residential property, the entire purchase attracts the surcharge. So if you buy a first home jointly with a partner who already owns a buy-to-let, the surcharge applies to the joint purchase, even though your partner is the only one with an existing property.

This is one reason JBSP arrangements have grown in popularity, by keeping the parent off the deeds, the child can buy as a first-time buyer without triggering the surcharge.

Inherited property and the surcharge

Special rules for inherited property:

• Inheriting a 50%+ share of a property within 3 years of a new purchase typically triggers the surcharge.
• Inheriting less than 50% within 3 years may not, depends on circumstances.
• Pre-existing inherited property held more than 3 years counts as a property you already own for surcharge purposes.

When the surcharge can be reclaimed

Two main reclaim scenarios:

• Sold previous main residence within 36 months of buying the new one, you can reclaim the surcharge in full.
• Errors at completion, sometimes solicitors apply the surcharge incorrectly. If you can prove you weren't liable, HMRC will refund.
• Reclaims need formal application through HMRC. Keep records of the original SDLT return and the eventual sale date of the old home.

Scotland and Wales

Scotland (LBTT, Land and Buildings Transaction Tax) and Wales (LTT, Land Transaction Tax) have similar but separately-calculated additional property surcharges. Different rates and slightly different rules apply. Always check the specific jurisdiction at purchase.

The 5% additional property surcharge can add tens of thousands to a purchase, but in some situations it's avoidable, JBSP arrangements, careful timing of sales, or replacing-main-residence reclaims. Get advice early in the process; the wrong structure costs real money. Debbie at DS Financial works with conveyancers and accountants to make sure clients aren't paying more SDLT than they need to.

General information, not financial advice. Your home may be repossessed if you do not keep up repayments on your mortgage.

Sources: GOV.UK, Stamp Duty Land Tax rates, HMRC, Higher rate Stamp Duty, MoneyHelper, Stamp Duty.