SDLT paragraph 9: trial separation vs a permanent split

When one half of a married couple or civil partnership buys a home in England or Northern Ireland on their own, the tax rules do not look only at what that person owns. Under Finance Act 2003, Schedule 4ZA, paragraph 9, a spouse or civil partner the buyer is "living together" with is treated as a joint purchaser — so a dwelling the other partner already owns is counted too. If that tips the buyer into owning an interest in more than one dwelling, the 5% higher rate of Stamp Duty Land Tax for additional properties lands on the whole purchase price (HMRC, buying an additional residential property, 2026).

On a home bought at the England median sale price of £290,000 (833,817 residential transactions recorded in 2025; HM Land Registry Price Paid, figures fetched 4 July 2026), that single rule is worth £14,500:

Standard SDLT at £290,000 is 0% to £125,000, 2% on the slice to £250,000 (£2,500) and 5% on the slice to £290,000 (£2,000). The higher rate adds five percentage points to every band, which nets out to a flat 5% of the whole £290,000 (HMRC, SDLT residential rates, 2026). The surcharge figure is hand-computed here because it is a uniform uplift; a conveyancer files the exact number on the return.

The rule: a spouse you are "living together" with is a deemed buyer

Paragraph 9 of Schedule 4ZA is headed "Spouses and civil partners purchasing alone". It applies where the buyer is married or in a civil partnership on the effective date of the transaction, the couple are living together on that date, and the spouse or civil partner is not already a named purchaser. Where it applies, the legislation treats the absent partner "as if" they were a joint purchaser. The practical consequence is that every dwelling that partner owns is pulled into the higher-rate test that asks whether the buyer ends up with an interest in more than one dwelling.

For most couples this is invisible, because they buy together and replace one main home with another. It bites hardest in one situation — a separating couple, where one partner moves out and buys somewhere new while the former matrimonial home, still owned by the other partner, sits in the background.

Three ways out — and only one of them is a document

Paragraph 9 has a built-in exit. A married couple or civil partners are treated as living together unless one of three things is true. The wording sits in Schedule 4ZA, paragraph 9(3), and mirrors the long-standing income-tax definition at section 1011 of the Income Tax Act 2007:

• (a) they are separated under an order of a court of competent jurisdiction;
• (b) they are separated by a deed of separation; or
• (c) they are in fact separated in circumstances in which the separation is likely to be permanent.

Routes (a) and (b) are documentary switches. Either a judicial separation order or a formal deed of separation exists on or before the effective date, or it does not — there is little room to argue. Route (c) has no governing document at all. It is a factual judgment about the state of the relationship, made at a single point in time, and it is the limb HMRC and taxpayers actually end up disputing.

What "likely to be permanent" actually means

This is the crux, and it cuts in two directions that both tend to surprise people.

A trial separation does not count. A couple who move to separate addresses to work out whether the marriage can be saved — still hoping, or intending, to reconcile — are by definition not separated in circumstances likely to be permanent. That unresolved intention to get back together is exactly what the words "likely to be permanent" exclude. So a couple on a genuine trial separation can be living at two addresses and still be "living together" for paragraph 9. The absent partner's home is aggregated, and the new purchase is surcharged.

A settled split can count with no paperwork at all. Where a couple have instead accepted that the marriage is over and there is no realistic prospect of reconciliation, limb (c) can be satisfied even though no divorce application has been made, no court order granted and no deed signed. The factual state — a permanent separation — is enough on its own. You do not have to be divorced, or even to have started divorce proceedings, to stop being "living together" for this rule.

The status is tested on one day

Because paragraph 9 turns on whether the couple are living together on the effective date — normally the day the purchase completes — the question is answered as at that day and no other. A separation that only hardens into permanence the month after completion does not retro-fit the earlier purchase; a reconciliation the month after does not unwind a separation that was genuinely permanent on completion day. That is why the timing of a separation relative to a purchase, and evidence of the couple's intentions as they stood on the day, carry so much weight. We set out the documents HMRC and the tribunals look for in the separation evidence checklist for paragraph 9.

Why limb (c) is where the arguments happen

Limbs (a) and (b) leave a paper trail an HMRC officer can inspect. Limb (c) leaves none — it is a question of fact, judged after the event, sometimes years later when an enquiry lands. That asymmetry is the whole reason a contested paragraph 9 case almost always turns on the "likely to be permanent" limb rather than the other two. There is no form that certifies a permanent separation, so anyone relying on limb (c) is left reconstructing the facts as they stood on completion day.

None of this changes the amount at stake, which is fixed by the bands. What it changes is whether the aggregation in paragraph 9 applies at all. Where it does apply — because the couple were still "living together" in the statutory sense — the surcharge can in some cases be recovered later if the old home is sold within the statutory window; that mechanism is separate and set out in the additional-property surcharge refund route. Where it does not apply, the standard rates run from the start. For the wider picture, see separated spouses and the additional-property surcharge and the general additional-property stamp duty surcharge explainer.

The bottom line

Paragraph 9(3) draws its line at permanence, not paperwork. A couple with a court order or a deed sit clearly outside the aggregation rule. A couple with neither can still sit outside it — if their separation was, as a matter of fact, likely to be permanent on the day they completed. And a couple who are physically apart but hoping to reconcile can still sit inside it. On a £290,000 purchase, £14,500 turns on which of those three states described the couple on one specific day.

This is general information, not advice. The "likely to be permanent" test is fact-sensitive, the higher-rate rules interact with the replacement-of-main-residence relief, and the penalty exposure for filing the wrong higher-rate answer is real. Speak to a qualified conveyancer — and, in any contested matrimonial-finance situation, a family-law solicitor — before relying on the paragraph 9(3) carve-out.

To see the all-in cost of a purchase at a real postcode — SDLT, the mortgage at the current Bank of England 75% LTV five-year fixed quoted rate of 4.32% (April 2026), the council tax band and EPC-based running costs — try Homecost for a Manchester postcode, model the surcharge on the stamp duty calculator, or browse the other Cost Intelligence guides.

Based on 30.98M HM Land Registry transactions and HMRC's published Stamp Duty Land Tax rules — see our methodology overview on the blog.