Compliance Penalties and Interest: Penalties, Interest, and Relevant Date Information

SDLT Compliance: Penalties, Interest and the Relevant Date

HMRC’s SDLT manual highlights three linked compliance issues: penalties for late returns, interest on late payment, and the “relevant date” used to measure deadlines. The manual page itself is only a signpost, so the legal position depends on the legislation, but it shows that getting the correct date is central to deciding whether any return or payment was late.

• SDLT compliance is about more than the tax due; it also covers filing returns on time and paying tax by the correct deadline.
• A late SDLT return can lead to penalties, while late payment of SDLT can lead to interest.
• Whether something is late depends on the correct statutory “relevant date” for the transaction.
• Penalties and interest should be considered separately, even if both arise from the same transaction.
• HMRC’s manual explains its approach, but the legislation determines actual liability.
• In more complex cases, the main difficulty is often working out the correct transaction timeline before assessing any compliance consequences.

Scroll down for the full analysis.

SDLT compliance: penalties, interest and the relevant date

This page explains the part of HMRC’s Stamp Duty Land Tax manual that signposts the compliance rules on penalties, interest and the “relevant date”. Although the source material is only a contents page, it points to an important area of SDLT administration: what happens if a return or payment is late, and the date from which those obligations are measured.

What this rule is about

SDLT is not just about whether tax is due. It also has a compliance framework. That framework deals with three linked questions:

• whether a land transaction return was filed on time
• whether any SDLT was paid on time
• what date counts as the starting point for those deadlines

The source material identifies those topics under three headings: penalties, interest and relevant date. In practice, those headings matter because a person can face extra amounts even where the underlying SDLT analysis is straightforward.

What the official source says

The source is an HMRC manual contents page within the compliance section of the SDLT manual. It lists:

• SDLTM85905 – Penalties
• SDLTM85910 – Interest
• SDLTM85930 – Relevant date

On its own, this page does not set out the detailed legal rules. It shows that HMRC treats penalties, interest and the relevant date as connected parts of SDLT compliance.

The legislation, rather than the contents page itself, determines when penalties or interest arise. HMRC’s manual explains HMRC’s view of how those rules operate.

What this means in practice

If you are dealing with SDLT compliance, you usually need to consider the filing and payment position together.

A late return may trigger a penalty regime. A late payment may trigger interest. To work out whether either applies, you need to identify the relevant date for the transaction, because that date is central to the timing rules.

This matters in everyday conveyancing and post-completion work. For example:

• you may need to decide whether a return was due at all
• if a return was due, you need to know the filing deadline
• if tax was due, you need to know the payment deadline
• if something was done late, you then need to consider penalties and interest separately

Even where the tax amount is later amended, compliance consequences may still need separate review.

How to analyse it

A sensible way to approach this area is:

1. Identify the transaction and confirm that it falls within SDLT.
2. Work out whether a land transaction return was required.
3. Identify the relevant date for the transaction.
4. Measure the filing and payment deadlines from that date under the SDLT rules.
5. Check what was actually filed and paid, and when.
6. Consider penalties for filing failures and interest for payment failures as separate issues.
7. If there was a delay, check whether the legislation or HMRC guidance recognises any basis for reducing or disapplying a penalty in the particular circumstances.

The key point is that “late” is not judged in the abstract. It is judged against the correct statutory date for that transaction.

Example

Illustration: a buyer completes a land transaction and SDLT is due. The return is filed after the statutory deadline and the tax is also paid after the deadline. In that situation, two different compliance consequences may need to be considered:

• a penalty position for the late return
• an interest position for the late payment

To analyse either properly, you first need to identify the relevant date from which the SDLT deadlines run. If the wrong date is used, the compliance result may also be wrong.

Why this can be difficult in practice

The source page is only a contents page, so it does not explain the detailed legal mechanics. In practice, the difficult part is often not the existence of penalties or interest, but identifying the correct date from which the SDLT obligations run.

That can matter where the transaction history is not simple, for example if there are questions about when the transaction became effective for SDLT purposes or whether later events changed the compliance position. In those cases, the legal analysis of the transaction timeline comes first, and the penalties or interest analysis follows from it.

Another practical difficulty is that readers sometimes treat HMRC manual material as if it were the law itself. It is not. The manual is useful for understanding HMRC’s approach, but the legislation governs liability.

Key takeaways

• The HMRC source page is a signpost to three linked SDLT compliance topics: penalties, interest and the relevant date.
• Whether a return or payment is late depends on the correct statutory timing analysis, not just on the completion date as a matter of assumption.
• Penalties and interest are related but distinct issues, and each should be checked separately against the legislation.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Compliance Penalties and Interest: Penalties, Interest, and Relevant Date Information

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