Do linked SDLT transactions trigger the higher rates after marriage if a spouse owns another home?

Introduction

This is a common Stamp Duty Land Tax question where one person buys further shares in a property over time and later gets married. Readers often want to know two things: first, whether the separate purchases are treated as linked transactions, and second, whether the higher residential SDLT rates can apply because a spouse owns another dwelling.

The answer can be surprising. Even if the buyer did not own another property when the earlier shares were acquired, the final purchase may still need to be looked at under the linked transaction rules and the higher rates rules in Schedule 4ZA Finance Act 2003.

The Question

A buyer inherited a dwelling jointly with a sibling and then bought further shares from that sibling in three stages:

• 25% for £125,000 in one tax year
• 1% for £6,000 in the following tax year
• the remaining 24% for £144,000 shortly afterwards

The total consideration across the three purchases is £275,000. At the time of the first two purchases, the buyer did not own any other dwelling. Before the final purchase, however, the buyer married someone who already owns another home and is keeping it. The question is whether:

• the three purchases are linked for SDLT purposes, and
• the higher residential SDLT rates apply to the final transaction because of the marriage and the spouse’s existing property ownership.

Nick’s Explanation

Nick’s reasoning was that the three acquisitions are likely to be linked transactions under section 108 Finance Act 2003 because they are purchases between the same buyer and seller forming part of a series of transactions to acquire full ownership.

He explained the standard-rate position in this way: if the transactions are linked, SDLT is calculated on the total consideration of £275,000, which gives total standard-rate SDLT of £3,750 before credit for any SDLT already paid on the earlier purchases.

He then identified the key change in the facts: the buyer is now married, and the spouse owns another residential property which is not being replaced. In anonymised form, his conclusion was:

“Married couples are treated as one unit under paragraph 9 of Schedule 4ZA. If one spouse owns another dwelling at completion and it is not being replaced as the only or main residence, the higher rates can apply. On those facts, the final acquisition falls into the higher-rate regime.”

On that basis, Nick calculated the total SDLT on the linked consideration of £275,000 using the higher residential rates, giving £15,000 in total, with credit then given for SDLT already paid on the earlier linked purchases.

The Law

The main provisions are these:

• Section 108 Finance Act 2003, which defines linked transactions
• Section 55 Finance Act 2003, which sets the SDLT charge by reference to consideration
• Schedule 4ZA Finance Act 2003, which imposes the higher rates for additional dwellings
• Paragraph 9 of Schedule 4ZA, which treats spouses and civil partners living together as a single unit for these purposes

In broad terms, transactions are linked if they form part of a single scheme, arrangement or series of transactions between the same buyer and seller, or persons connected with them. Where transactions are linked, SDLT is not worked out separately on each purchase in isolation. Instead, the consideration is aggregated and the tax is calculated on the total amount, with credit given for SDLT already paid on earlier linked transactions.

Schedule 4ZA applies where a purchaser acquires a major interest in a dwelling and, at the effective date of the transaction, the conditions for the higher rates are met. One of the central questions is whether the purchaser is treated as owning another dwelling and whether the new purchase is replacing the purchaser’s only or main residence.

For married couples living together, paragraph 9 can attribute one spouse’s property position to the other. That means a buyer who would otherwise appear to be purchasing their only property can still be within the higher rates if their spouse owns another dwelling and the replacement exception does not apply.

Analysis

The analysis can be broken down into four steps.

First, are the purchases linked?

On these facts, probably yes. The same buyer is acquiring successive shares in the same dwelling from the same seller. That strongly suggests a series of transactions forming part of an overall arrangement to move from part ownership to full ownership. If they are linked, the total consideration is £275,000.

Second, what would the SDLT be at standard residential rates?

Using the residential rates stated in Nick’s reply, the tax on £275,000 is:

• 0% on the first £125,000 = £0
• 2% on the next £125,000 = £2,500
• 5% on the remaining £25,000 = £1,250

Total standard-rate SDLT: £3,750.

If the earlier transactions were linked, SDLT already paid on them is set against that total, so only the balance remains payable on the final transaction.

Third, do the higher rates apply to the final purchase?

This is where the marriage matters. At the time of the final acquisition, the buyer is married and the spouse owns another dwelling which is being retained. If the couple are living together, paragraph 9 of Schedule 4ZA treats them as one unit. As a result, the spouse’s ownership of another dwelling is taken into account.

The next question is whether the purchase is replacing the couple’s only or main residence. On the facts given, it is not. The spouse’s existing home is not being sold and replaced by this purchase. That means the replacement exception does not appear to apply.

So, although the buyer did not personally own another dwelling at the time of the final purchase, the higher rates are still engaged because of the spouse’s continuing ownership.

Fourth, how is the tax calculated if the higher rates apply?

Nick’s calculation used the linked total of £275,000 and applied the higher residential rates as follows:

• 5% on the first £250,000 = £12,500
• 10% on the remaining £25,000 = £2,500

Total higher-rate SDLT: £15,000.

Again, SDLT already paid on the earlier linked transactions would be credited, leaving the balance to be paid on completion of the final purchase.

One point of practical importance is that the earlier purchases took place before the marriage. That helps explain why the higher rates may not have applied at the time of those earlier acquisitions. But once the final linked transaction takes place after marriage, the higher-rate analysis has to be revisited by reference to the position at that later effective date.

Outcome

On the facts described, the likely outcome is:

• the three share purchases are linked transactions under section 108 Finance Act 2003;
• SDLT is therefore calculated by reference to the total consideration of £275,000;
• because the buyer is now married to a spouse who owns another dwelling that is not being replaced, the higher residential SDLT rates are likely to apply to the final linked calculation; and
• the total SDLT on the linked transactions is likely to be £15,000, less credit for SDLT already paid on the earlier purchases.

Practical Steps

If you are in a similar position, check the following carefully before completion:

• whether the separate acquisitions are linked under section 108;
• the total consideration paid across all linked transactions;
• whether you are married or in a civil partnership and living together at the effective date;
• whether either spouse owns another dwelling anywhere in the world;
• whether the new purchase is genuinely replacing an only or main residence;
• how much SDLT, if any, was paid on the earlier linked transactions so that proper credit can be given.

You should also make sure the SDLT return for the final transaction correctly reflects the linked transaction position. If earlier returns did not fully account for linkage, the final return may bring the overall series into focus.

If part of the argument depends on whether a property was uninhabitable or not suitable for use as a dwelling, note that the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. Ordinary disrepair or the need for renovation will often not be enough.

Conclusion

Where a buyer acquires a property share in stages from the same seller, the transactions will often be linked. If the buyer later marries someone who owns another home and that home is not being replaced, the higher SDLT rates can apply to the final linked calculation even though the earlier purchases happened before the marriage. In a case like this, the combined SDLT position can be significantly higher than expected.

Legal References Used

• Finance Act 2003, section 55
• Finance Act 2003, section 108
• Finance Act 2003, Schedule 4ZA
• Finance Act 2003, Schedule 4ZA, paragraph 9
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799

This page was last updated on 22 March 2026.

See all questions and answers categorized in this sitemap. Or use Google site search below.