First-time buyer stamp duty relief: married vs unmarried couples
A first-time buyer purchasing a £300,000 home in England pays £0 in Stamp Duty Land Tax (SDLT) — the price sits exactly on the first-time buyer nil-rate band (Homecost stamp duty calculator, England, 7 July 2026). But that relief is fragile. Whether a partner or spouse wipes it out turns on two things: whether you are married, and whose name goes on the deed. Get one wrong and the same £300,000 purchase can carry a five-figure tax bill instead of nothing.
The relief is set out in Schedule 6ZA of the Finance Act 2003. It has clear conditions — and two entirely separate rules can strip it away. This piece maps how the relief behaves across four common situations, using worked figures at £300,000, the level where exactly half of England's 2025 residential sales took place (HM Land Registry, single-residential sales, 2025).
What the relief actually does
Since 1 April 2025, first-time buyer relief works like this in England and Northern Ireland:
- No SDLT on the first £300,000 of the price.
- 5% on the slice from £300,001 to £500,000.
- No relief at all above £500,000 — the whole purchase reverts to standard rates.
So an eligible first-time buyer pays £0 up to £300,000, then £5,000 at £400,000 and £10,000 at £500,000 (Homecost stamp duty calculator, 7 July 2026). One pound over the ceiling — £500,001 — and relief vanishes entirely: the bill jumps to £15,000, a £5,000 cliff for a single pound. The April 2025 threshold changes lowered both the nil-rate band and the ceiling from their earlier levels.
To qualify, the legislation requires that:
- every purchaser is a first-time buyer — an individual who has never held a major interest in a dwelling anywhere in the world (Sch 6ZA);
- the buyer or buyers intend to occupy the property as their only or main residence; and
- the transaction is not a "higher-rates transaction" under Schedule 4ZA — the same schedule that governs the 5% additional-property surcharge.
Those last two conditions are where couples come unstuck. And the rule that catches them differs depending on whether they are married.
The four cases at a glance
Assume one half of a couple has never owned property (the would-be first-time buyer) and the other already owns a home they are keeping. Here is whether the relief survives:
| Solo (buyer's sole name) | Joint (both on the deed) | |
|---|---|---|
| Married / civil partners | Relief lost | Relief lost |
| Unmarried, cohabiting | Relief kept | Relief lost |
Three of the four combinations lose the relief — but for two different reasons. Only one keeps it. The mechanics matter, because they are exactly what a conveyancer checks before submitting the return.
Rule 1 — a joint purchase needs everyone to be a first-time buyer
Schedule 6ZA requires that all purchasers are first-time buyers. There is no apportionment: if one person on the deed has ever owned a dwelling, relief is denied for the whole transaction, not just their share.
This rule is blind to marital status. Two unmarried people buying together, where one already owns a flat, lose the relief just as surely as a married couple would. The moment a second, non-first-time buyer becomes a purchaser, the relief is gone. That is why the "Joint" column is a loss in both rows — the all-purchasers test does the work, and no attribution rule is needed. It is the same trap set out in the joint-buyer stamp duty guide.
Rule 2 — marriage attributes your spouse's home to you
The second rule reaches only married couples and civil partners. Under Schedule 4ZA, paragraph 9, a person's spouse or civil partner who is living with them is treated as a joint purchaser for the higher-rates test — so the spouse's existing property is attributed to the buyer, even on a purchase in one name only.
In practice: if one spouse owns a home and the other — a genuine first-time buyer — buys a new property in their sole name, paragraph 9 deems the transaction a higher-rates transaction. That trips the third condition of Schedule 6ZA, and first-time buyer relief is refused. The buyer never owned a home in their own right; the marriage did the damage. This attribution route is examined in detail in how spousal aggregation cancels first-time buyer relief.
The one case that keeps the relief: unmarried, buying solo
Paragraph 9 attribution reaches only spouses and civil partners. It does not reach cohabiting partners. So an unmarried first-time buyer purchasing in their sole name does not lose relief merely because the person they live with owns a home elsewhere.
This is the exact mirror of the additional-property surcharge position, where an unmarried solo buyer likewise escapes their partner's second-home history — set out in married versus unmarried couples and the additional-property surcharge.
One condition governs it, though: the relief survives only if the cohabiting partner is genuinely not a purchaser — that is, they acquire no beneficial interest in the property. If the partner contributes to the purchase in a way that gives them a share, or is named on the title, they become a purchaser and Rule 1 applies. HMRC and conveyancers look at beneficial ownership, not just the names on the mortgage.
What it costs at £300,000
Putting real numbers on it. All figures are England, from the Homecost stamp duty calculator on 7 July 2026, and assume the existing home is retained — which makes each "relief lost" case a higher-rates transaction:
| Scenario | Relief? | SDLT at £300,000 |
|---|---|---|
| Unmarried, solo purchase | Applies | £0 |
| Married, solo purchase (spouse owns) | Denied — attribution | £20,000 |
| Married, joint purchase (spouse owns) | Denied — all-buyers rule | £20,000 |
| Unmarried, joint purchase (partner owns) | Denied — all-buyers rule | £20,000 |
The £20,000 is two costs stacked: losing the £5,000 relief, plus the 5% higher-rates surcharge (£15,000) that applies because a second dwelling is being kept. Where the existing home is instead sold as part of the move — replacing a main residence — the surcharge falls away and the standard-rate bill would be £5,000, but relief is still denied in the three losing cases.
At the £300,000 national median, that is the difference between paying nothing and paying £20,000 on the same house — decided by marital status and the wording of the deed, not by the buyer's own ownership history.
Two rules, one relief
The takeaway is that first-time buyer relief can fail two independent ways:
- the all-purchasers condition — any joint purchase with a non-first-time buyer — which is blind to marriage; and
- spousal attribution under paragraph 9 — a married solo buyer — which applies only to spouses and civil partners.
The surcharge rules and the relief rules share the paragraph 9 machinery but apply it to different reliefs. The first-time buyer relief explainer covers the qualifying conditions in full, and the wider set of thresholds sits under Cost Intelligence.
See it for your own numbers
Try the Homecost stamp duty calculator with first-time buyer relief switched on to see the bands move, or check what homes actually sell for in a typical first-time-buyer area with the true-cost lookup for Manchester's M1 1AE.
Based on 699,846 English single-residential sales recorded by HM Land Registry for 2025 and the SDLT rates in force in July 2026 (browse all guides). This is general information about how the rules work, not tax advice, and individual circumstances change the answer. Speak to a qualified adviser or conveyancer before acting.