Why the surcharge exists and when it applies
The additional property rules were brought in to slow down investors competing with ordinary buyers. The trigger is simple in principle. At the end of the day the purchase completes, if you own a major interest in more than one dwelling and you are not replacing your only or main residence, the surcharge applies.
Two points catch people out. The first is that properties owned anywhere in the world count, not just in the United Kingdom. A share in a family home abroad can trigger the surcharge on a purchase here. The second is that a married couple or civil partners are treated as one unit, so a property owned by your spouse counts as yours even if your name is nowhere on the deeds.
The rates in England and Northern Ireland
Since 31 October 2024 the surcharge has been 5 percentage points, up from the previous 3. Applied to the standard bands that gives 5% up to £125,000, 7% from £125,001 to £250,000, 10% from £250,001 to £925,000, 15% from £925,001 to £1.5 million and 17% above that.
Because the surcharge is added to every band, the effect is simply 5% of the whole purchase price on top of the normal bill. On a £310,000 second home the standard tax is £5,500 and the surcharge adds £15,500, giving a total of £21,000. The threshold for the surcharge to apply at all is £40,000, and once the price reaches that figure the surcharge applies to the entire amount, not just the excess.
Scotland: the Additional Dwelling Supplement
Scotland works differently and, for most purchases, more harshly. The Additional Dwelling Supplement has been 8% since 5 December 2024, and it is charged as a flat percentage of the whole purchase price rather than being layered into the bands.
On the same £310,000 property the ordinary Scottish tax is £5,100 and the supplement adds 8% of £310,000, which is £24,800. The total is £29,900, considerably more than the English equivalent. The £40,000 entry threshold applies in the same way.
Wales: separate higher residential rates
Wales does not add a surcharge to its main rates. Instead it applies a completely separate table. Since 11 December 2024 those higher residential rates have been 5% up to £180,000, 8.5% from £180,001 to £250,000, 10% from £250,001 to £400,000, 12.5% from £400,001 to £750,000, 15% from £750,001 to £1.5 million and 17% above that.
On our £310,000 example a Welsh buyer pays 5% on the first £180,000, which is £9,000, then 8.5% on £70,000, which is £5,950, then 10% on £60,000, which is £6,000. The total is £20,950. So the same second home costs roughly £21,000 in England, £20,950 in Wales and £29,900 in Scotland.
Replacing your main residence
The surcharge is not meant to catch people simply moving house. If you sell your previous main residence on or before the day you buy the new one, the surcharge does not apply at all, even if you own other property such as a rental.
If the sale has not completed by the time you buy, you must pay the surcharge up front and reclaim it once the old home sells. The sale has to happen within 3 years of the new purchase. The claim itself must then be made within 12 months of the sale, or within 12 months of the filing date of the original return, whichever is later. Missing that window is one of the most expensive administrative errors in property tax, because there is no discretion to extend it in ordinary circumstances.
The reliefs and exceptions worth knowing
A property worth less than £40,000 is ignored entirely, which is why a small share in a low value property may not cause a problem. Mixed use property, where part of the purchase is genuinely commercial, is charged at non residential rates and the surcharge does not apply. Buying six or more dwellings in a single transaction allows you to treat the purchase as non residential, which again removes the surcharge and can save a great deal on a portfolio deal.
Where a property contains a self contained annexe, subsidiary dwelling rules can prevent the annexe from being treated as a second dwelling, provided it makes up no more than a third of the total value. Caravans, houseboats and mobile homes are outside the charge. Purpose built student accommodation and certain care accommodation can also fall outside it.
Companies and multiple purchases
A company buying residential property pays the surcharge from the very first purchase, because there is no concept of a company having a main residence. On top of that, a company buying a single dwelling for more than £500,000 in England or Northern Ireland can face a flat 17% charge unless a relief such as property rental business relief applies. Anyone considering buying through a company should work the numbers through carefully before committing.
Buying a second property?
The surcharge is often avoidable or reclaimable, and the difference runs into thousands. We check the position before completion and handle refund claims where a main residence has since been sold.
Frequently asked questions
How much extra stamp duty do I pay on a second home?
In England and Northern Ireland, 5% of the purchase price on top of the normal bill. In Scotland, a flat 8% of the price. In Wales, a separate higher rate table applies rather than a straight addition.
Do I pay the surcharge if I am just moving house?
No, provided you sell your previous main residence on or before the day you complete on the new one. If the sale happens later, you pay the surcharge and reclaim it once the old home sells.
How long do I have to sell my old home to get the surcharge back?
3 years from the date of the new purchase. The refund claim must then be made within 12 months of that sale, or within 12 months of the original filing date if that is later.
Does a property I own abroad count?
Yes. Properties anywhere in the world count when deciding whether you own more than one dwelling, and a property owned by your spouse or civil partner counts as yours.
Is there a minimum price before the surcharge applies?
Yes, £40,000. Below that the surcharge does not apply, but once the price reaches £40,000 the surcharge applies to the whole amount rather than just the excess.