Marriage & Stamp Duty: First-Time Buyer Relief, Surcharge & Spouse Rules

How Marriage Changes Your Stamp Duty Status

The single economic unit rule is real, but it is narrower than it is often described. It belongs to the additional dwelling surcharge. For that test, a dwelling owned by one spouse or civil partner counts as if it belonged to both, so long as the couple are living together. It applies even where only one of them is buying.

What the rule attributes is current ownership, not ownership history. A property your spouse owned years ago and has since sold is not attributed to you, and marrying someone who has previously owned a home does not by itself end your own first-time buyer status.

First-time buyer relief is affected, but indirectly. If your spouse currently owns a dwelling and you are living together, your purchase is treated as a higher rates transaction, and first-time buyer relief cannot apply to a higher rates transaction. Separately, and regardless of marriage, on any joint purchase every buyer must be a first-time buyer for the relief to apply.

For a fuller treatment of how the unit rule works, see our guide to married couple property rules.

Your position is tested at the effective date of the transaction, which is normally completion, or the date of substantial performance if that comes first. So what matters is whether you are married and living together on that date, not when you exchanged contracts. Exchanging before the wedding does not lock in your pre-marriage status if you complete after it.

Timing can therefore matter, but only where the other partner currently owns a dwelling. In that case, completing a sole-name purchase before the marriage keeps the first-time buyer partner assessed on their own position. Complete after the marriage and their partner's current ownership is attributed to them, which makes it a higher rates transaction and rules out the relief. Buying in a sole name does not avoid this once you are married and living together, as the section below explains. If the other partner owned a property in the past but has since sold it, none of this applies and there is nothing to time around the wedding.

First-Time Buyer Relief: When Marriage Ends Eligibility

First-time buyer relief requires that every buyer in a transaction has never previously owned a residential property anywhere in the world. For a joint purchase by a married couple, both spouses must individually qualify as first-time buyers.

If your spouse has ever owned property, even something small, even something sold decades ago, even property inherited briefly, neither of you can claim FTB relief on a joint purchase. The relief is all-or-nothing for all buyers in the transaction.

Our complete first-time buyer guide covers all eligibility criteria in detail, including the impact of marriage on relief.

The "all-or-nothing" rule for joint purchases stands in contrast to sole-name purchases, where an unmarried first-time buyer could purchase alone and retain FTB eligibility regardless of their partner's history. For married couples, there is no partial FTB relief on a joint purchase. If either spouse has previously owned property, neither can claim relief. The FTB relief is simply unavailable for the entire transaction.

One nuance worth noting: the disqualification applies to property owned "anywhere in the world" at any point in the past, not just current ownership. A spouse who sold a property a decade ago, or who inherited a tiny share that was subsequently sold, has still "owned" residential property and cannot qualify as a first-time buyer. There is no time-based amnesty or minimum ownership threshold: even a brief or involuntary ownership period counts permanently.

The 5% Additional Dwelling Surcharge and Spouses

The additional dwelling surcharge (5% from October 2024) applies when a buyer owns, or their spouse owns, any residential property at the time of a new purchase. For married couples, if either spouse holds a residential property interest anywhere, the surcharge applies to any further purchase.

Use our second home calculator to calculate exactly how much the surcharge adds to your purchase.

One important exception to the surcharge: it does not apply to a married couple's joint purchase if they are simultaneously replacing their only or main residence. If you sell your main home and buy a new one on the same day, you own only one property at the moment of completion. The surcharge does not apply, even if your spouse owns another property such as a rental flat. The "replacement main residence" test looks at the couple's overall position: are you adding to total property holdings, or simply exchanging one main home for another?

Overseas Property and the Surcharge

Many couples are caught out by this rule: overseas property counts for both first-time buyer eligibility and the additional dwelling surcharge. There is no geographical limitation in the SDLT rules.

If your spouse owns a ski chalet in France, an apartment in Spain, or an investment property in Dubai, that overseas interest is attributed to both of you for SDLT purposes once you are married. This means:

• •Neither of you can claim first-time buyer relief on a joint purchase
• •The 5% surcharge applies to any new UK residential property you buy together
• •Buying in your sole name does not escape the surcharge (see next section)

Buying in Your Own Name: Does It Help?

A common misconception is that buying a property in your sole name (not including your spouse on the title deeds) avoids the additional dwelling surcharge if your spouse owns other property. This is incorrect.

SDLT rules explicitly include ownership by a spouse or civil partner when assessing surcharge liability. If you are purchasing in your sole name but your spouse owns property, the surcharge still applies to your purchase. You cannot "ringfence" a purchase from your spouse's ownership history simply by keeping them off the deeds.

There is one exception: the "single unit" rule only runs while you are living together. It stops if you are separated under a court order, separated by a deed of separation, or separated in circumstances in which the separation is likely to be permanent. From that point you are assessed independently.

The rationale behind the sole-name rule is that SDLT assesses the "purchaser", and for any married person buying property, their spouse's connected interest is taken into account for surcharge purposes. This is deliberate policy, not a loophole, designed to prevent couples from routing purchases through one spouse to sidestep the surcharge that would otherwise apply to the couple collectively.

There are legitimate scenarios where a sole-name purchase in marriage makes commercial and legal sense. If you are replacing your own main residence (selling and buying simultaneously), the replacement main residence exemption applies and the surcharge does not arise regardless of what your spouse owns. If the property is genuinely only yours, for estate planning or business reasons, a sole-name purchase is valid. The SDLT exposure simply needs to be factored in when your spouse holds other residential property.

Cohabiting vs Married: The Difference

Unmarried cohabiting couples are treated as separate individuals for SDLT purposes. Each person is assessed independently, without reference to their partner's property ownership. This creates a significant difference between the SDLT position of married and unmarried couples.

This is why some couples choose to purchase before getting married, if one is a first-time buyer and the other is not. Timing matters significantly.

Planning Around Your Stamp Duty Position

While the rules are rigid, there are legitimate planning steps couples can take:

• Buy before marriage if timing worksIf one partner is a first-time buyer and can genuinely purchase before the wedding, doing so preserves FTB relief on that purchase. This must be a genuine purchase, not a contrived arrangement.
• Sole name purchase as main residence replacementIf you are replacing your only main residence (selling old, buying new), the surcharge does not apply even if your spouse owns other property, because you are not adding to total property holdings.
• Consider selling the other property firstIf your spouse sells their existing property before you purchase, the surcharge no longer applies (assuming you won't own more than one property post-purchase). Timing the sale and purchase carefully can eliminate the surcharge entirely.
• Non-resident surcharge exception for mixed-residency couplesIf one spouse is UK-resident and the other is not, the 2% non-resident surcharge is waived for the non-resident buyer on a joint purchase, as long as one buyer qualifies as UK-resident.