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

How Marriage Changes Your Stamp Duty Status

For stamp duty purposes, married couples and civil partners are treated as a single economic unit. This is a fundamental principle of SDLT, not a discretionary rule. From the date of your marriage, HMRC looks at the combined property ownership of both spouses when assessing stamp duty on any purchase.

This combined assessment affects two key areas: first-time buyer relief and the additional dwelling surcharge. In both cases, the property history and current ownership of either spouse is attributed to the couple as a whole.

For a detailed comparison, see our guide on whether married couples pay more stamp duty.

The combined assessment takes effect from the date of the marriage, not from the date of any future property purchase. Once married, your spouse's existing property interests are immediately attributed to you for SDLT purposes. There is no grace period, no transitional arrangement, and no ability to lock in your pre-marriage status for a pending transaction unless contracts were already exchanged before the wedding.

This means timing is critical for couples who are planning a property purchase around the same time as their marriage. If one partner is a first-time buyer and the other owns property, completing the purchase before the marriage date preserves the FTB partner's individual status. After the marriage, the FTB partner cannot claim individual FTB relief on a joint purchase. Only a sole-name purchase (where the FTB partner is the only buyer) could potentially preserve that status.

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: if you and your spouse are legally separated or divorced, the "single unit" rule no longer applies, and 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.