Guidance on SDLT Procedures for Later Linked Property Transactions

Later linked transactions and revisiting an earlier SDLT position

If a later land transaction is linked to an earlier one, SDLT must be worked out by looking at the transactions together. This can mean tax becomes due on the earlier transaction, or that more tax is payable. HMRC’s guidance mainly explains the procedure: what return or letter is needed, what details must be included, and whether the deadline is 30 days or, in some cases, 14 days from the later transaction.

• A later linked transaction can change the SDLT result for an earlier transaction, even if no tax was due or no return was filed at the time.
• If the earlier transaction already had an SDLT return, HMRC says the later transaction should be filed on SDLT1 and the earlier transaction should usually be updated by letter to the Stamp Office.
• If the earlier transaction was below the notification threshold but now becomes notifiable, HMRC says an SDLT1 is needed for both the later and the earlier transaction.
• The extra submission should include the relevant UTRN, details of the consideration for the later transaction, and a self-assessment of the tax or additional tax due.
• The usual payment deadline is 30 days from the later linked transaction, but where the earlier transaction becomes notifiable for the first time, the deadline is 14 days from 1 March 2019.
• The main legal difficulty is often deciding whether the transactions are truly linked, as HMRC’s guidance assumes that point has already been established.

Scroll down for the full analysis.

Later linked transactions: when an earlier SDLT position has to be revisited

This page explains what happens if you complete one land transaction, and then a later linked transaction changes the SDLT position for the earlier one. The key point is that linked transactions are looked at together. A later deal can mean tax becomes due on an earlier transaction, or that extra tax is due. HMRC’s manual page is mainly about procedure: what return is needed, what information must be sent, and when payment must be made.

What this rule is about

SDLT on linked transactions is not always worked out by looking at each transaction in isolation. If a later transaction is linked with an earlier one, the combined consideration may change the tax result.

That matters in three common situations:

• the earlier transaction was notified, but no tax was due at the time;
• the earlier transaction was notified and tax was paid, but the later linked transaction means more tax is now due; or
• the earlier transaction was not notified at all, because it was below the notification threshold, but the later linked transaction means the earlier transaction now has to be brought into the SDLT process.

The HMRC material here is procedural. It does not restate the full law on when transactions are linked. It assumes that a later transaction is linked and focuses on what must be done once that is accepted.

What the official source says

The manual describes three cases.

First, if the original transaction was filed on an SDLT1 but no tax was due because the consideration was below the tax threshold, and a later linked transaction means the original transaction must now be revisited, an SDLT1 is required for the later transaction. In addition, a further return is required for the original transaction. HMRC says this is done by letter to the Stamp Office. The letter should include:

• the UTRN of the original return;
• details of the consideration on the second transaction; and
• a self-assessment of the tax now due, if applicable.

Tax must be paid within 30 days of the later linked transaction.

Second, if the original transaction was notified and tax was paid at the rate then applicable, and a later linked transaction means additional tax is due, an SDLT1 is again required for the later transaction. A further return is also required for the original transaction, again by letter to the Stamp Office, containing:

• the UTRN of the original return;
• details of the consideration on the second transaction; and
• a self-assessment of the additional tax now due.

Payment must be made within 30 days of the later linked transaction.

Third, if the original transaction was not notifiable because it fell below the notification threshold, but a later linked transaction means the original position must be revisited, notification may now be required and additional tax may be due. If notification is still not required, HMRC says no further action is needed for the transactions. If notification is required, an SDLT1 should be filed for the later transaction in the normal way, and an SDLT1 is then also required for the original transaction. HMRC says the original SDLT1 should be sent to the Stamp Office with a letter containing:

• the UTRN of the subsequent return;
• details of the consideration on the second transaction; and
• a self-assessment of any additional tax now due.

The manual then adds an important timing point. From 1 March 2019, where the original transaction becomes notifiable for the first time, the return must be made and tax due paid within 14 days of the later linked transaction.

What this means in practice

If a later deal is linked to an earlier one, you do not simply file the later transaction and leave the earlier one alone. You may need to revisit the earlier transaction because the SDLT calculation changes once the transactions are aggregated in the way the linked-transactions rules require.

In practical terms, there are usually two separate compliance steps:

• file the SDLT return for the later transaction; and
• deal with the earlier transaction again, either by sending a letter referring back to the original return, or by filing an SDLT1 for the earlier transaction if it had not previously been notified.

The exact route depends on what happened with the earlier transaction in the first place.

If the earlier transaction already had a return, HMRC’s manual says the further return for that earlier transaction takes the form of a letter to the Stamp Office. If the earlier transaction was not previously notifiable, and it now becomes notifiable because of the linked transaction position, HMRC says an SDLT1 is required for that earlier transaction as well.

The payment deadline is also important. The manual gives a general 30-day deadline measured from the later linked transaction, but for cases from 1 March 2019 where the original transaction becomes notifiable for the first time, the deadline is 14 days.

How to analyse it

A sensible way to approach this is to ask the following questions.

• Is the later transaction in fact linked with the earlier one? This page assumes the answer is yes, but that is the first legal question.
• What was done for the earlier transaction at the time? Was an SDLT1 filed? Was tax paid? Or was it treated as not notifiable?
• Does the later linked transaction change the SDLT result for the earlier one? For example, does tax now become due, or does more tax become due?
• Does the earlier transaction now become notifiable for the first time?
• What documents are now needed: an SDLT1 for the later transaction, a letter to the Stamp Office about the earlier one, or an SDLT1 for the earlier one as well?
• What deadline applies: 30 days from the later linked transaction, or 14 days if the earlier transaction becomes notifiable for the first time on or after 1 March 2019?

When preparing the additional submission, HMRC’s manual expects enough information to connect the transactions and calculate the revised tax. That is why it asks for the UTRN of the original or subsequent return, details of the consideration on the second transaction, and a self-assessment of the tax now due or the additional tax due.

Example

Illustration: a buyer completes an initial land transaction and files an SDLT return for it. At that stage, no tax is due. Later, the buyer enters into a second transaction that is linked with the first. Once the two transactions are looked at together, SDLT is now payable on the earlier transaction as well.

Under HMRC’s procedure, the buyer must file an SDLT1 for the second transaction. The buyer must also write to the Stamp Office about the first transaction, giving the UTRN for that first return, the consideration for the second transaction, and a self-assessment of the tax now due. Payment must then be made within the relevant deadline running from the later linked transaction.

Why this can be difficult in practice

The procedural steps are relatively clear, but the underlying trigger can be more difficult. The hard question is often whether the transactions are truly linked. This manual page does not explain that test. It starts from the point where a later linked transaction already exists.

There can also be practical uncertainty about timing and process, especially where the earlier transaction was below the notification threshold and no return was filed at the time. In those cases, it is important to distinguish between:

• an earlier transaction that was notified but tax-free at the time;
• an earlier transaction that was notified and taxed at the time; and
• an earlier transaction that was not notified at all.

That distinction affects whether HMRC expects a letter about the earlier return or a fresh SDLT1 for the earlier transaction.

The change from 30 days to 14 days for cases where the original transaction becomes notifiable for the first time is another point that can be missed. The manual states that this shorter deadline applies from 1 March 2019. Anyone reviewing older transactions should therefore be careful to identify which timing rule applies.

Key takeaways

• A later linked transaction can change the SDLT position for an earlier transaction, including making tax due where none was due before.
• You usually need to file the later transaction in the normal way and also make a further submission about the earlier transaction.
• If the earlier transaction becomes notifiable for the first time, the manual says the return and tax are due within 14 days of the later linked transaction from 1 March 2019.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Guidance on SDLT Procedures for Later Linked Property Transactions

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