Introduction to SDLT: Tax Rates, Calculations, and Linked Transactions Guidance

How SDLT rates are calculated

Stamp Duty Land Tax is usually worked out using a marginal rate system, so different parts of the price can be taxed at different rates. The final amount depends not only on the price, but also on whether the property is residential, non-residential or mixed, and whether the deal is linked to other transactions.

• SDLT is charged by applying each tax rate only to the part of the chargeable consideration that falls within that band, not to the whole price.
• You must first identify the correct chargeable consideration before working out which SDLT rates apply.
• The rate table used depends on the nature of the land, including whether it is wholly or partly non-residential.
• If transactions are linked, the rates are normally worked out by reference to the total consideration for all linked transactions together, which can increase the tax due.
• After calculating the SDLT, the amount is rounded down to the nearest pound.
• For transactions before 1 June 2024, multiple dwellings relief may affect how linked transaction rules apply.

Scroll down for the full analysis.

How SDLT rates are worked out

This page explains the basic rule for calculating Stamp Duty Land Tax when a land transaction is chargeable. The key point is that SDLT uses a marginal rate system. That means different parts of the price can be taxed at different rates, rather than the whole price being taxed at one single rate. The page also highlights two issues that often change the result in practice: whether the property is residential or non-residential, and whether the transaction is linked with another transaction.

What this rule is about

The source material is dealing with the core calculation rule in Finance Act 2003, section 55. Once you know that a transaction is within SDLT and you know the amount of chargeable consideration, you then need to work out which rates apply and how much tax is due.

This is not just a mechanical exercise. The amount of SDLT depends on several prior questions, including:

• what counts as chargeable consideration for the transaction
• whether the land is wholly or partly non-residential
• whether the transaction stands alone or is linked to other chargeable transactions

Those points can materially alter the rate bands used and the final tax figure.

What the official source says

HMRC’s manual says that SDLT is calculated using a marginal rate system. Each tax rate applies only to the slice of chargeable consideration that falls within that band. After calculating the amount due, the figure is rounded down to the nearest pound.

The manual also says that the rates depend on:

• the amount of chargeable consideration, and
• whether the land is wholly or partly non-residential

It further states that if a transaction is linked to another chargeable transaction, the rates are determined by looking at the total consideration for all the linked transactions together. The source notes one qualification for transactions before 1 June 2024: multiple dwellings relief may affect the position.

HMRC also notes that linked transactions can be reported on the same land transaction return, and that the purchasers will be treated as joint or common purchasers for that purpose.

What this means in practice

The practical effect is that you should not start by asking, “What SDLT rate applies to this purchase price?” That question is too simple. Instead, you need to work through the structure of the transaction first.

In practice, the calculation usually involves these steps:

• identify the chargeable consideration
• decide whether the property is residential, non-residential, or mixed so that the correct rate table can be used
• check whether there are linked transactions, because linked transactions can push the total consideration into higher bands
• apply the marginal rate calculation to the relevant total
• round the final SDLT amount down to the nearest pound

This matters because two transactions with the same stated price may produce different SDLT outcomes if one involves non-residential land, or if one is linked to another acquisition.

How to analyse it

A sensible way to analyse the point is to ask the following questions in order.

1. What is the chargeable consideration?

You need the correct tax base before you can apply any rates. The source does not set out the full rules on consideration, but it makes clear that SDLT is charged by reference to chargeable consideration as defined elsewhere in the legislation and HMRC manual.

2. What is the nature of the land being acquired?

The applicable rates depend on whether the land is wholly or partly non-residential. That means classification matters. If any part of the subject matter is non-residential, that may affect which rate structure applies.

3. Is the transaction linked to any other chargeable transaction?

This is often overlooked. If transactions are linked, the rate calculation is normally done by reference to the total consideration for all linked transactions, not each transaction in isolation. A buyer cannot safely assume that splitting a deal into separate contracts means each one is taxed separately at lower bands.

4. Is there any special rule affecting linked transactions?

The source flags one specific point for transactions before 1 June 2024: multiple dwellings relief may alter the normal linked transaction position. The source does not explain the relief in detail, so that issue needs separate analysis where relevant.

5. Has the tax been rounded correctly?

Once the SDLT has been calculated, the amount is rounded down to the nearest pound. This is a small point, but it is part of the statutory calculation.

Example

This is a simple illustration of the marginal rate principle rather than a statement of current thresholds.

Suppose a rate table taxes the first slice of consideration at one rate and the next slice at a higher rate. If the purchase price falls partly into each band, you do not apply the higher rate to the whole price. You apply the lower rate to the part in the lower band and the higher rate only to the part above that threshold.

Now add a linked transaction. If the buyer acquires two properties under linked arrangements, the rate bands may need to be tested by reference to the combined price of both transactions. That can increase the effective SDLT payable on each transaction compared with treating them separately.

Why this can be difficult in practice

The calculation rule itself is straightforward, but the inputs can be difficult.

First, classification of land is not always obvious. Some transactions involve mixed elements, and the source makes clear that whether land is wholly or partly non-residential affects the rates.

Secondly, linked transactions are highly fact-sensitive. Whether transactions are linked depends on the legal and factual relationship between them. A person may think they are buying separate interests under separate contracts, but the SDLT rules may still require them to be treated together.

Thirdly, the source refers to multiple dwellings relief for transactions before 1 June 2024, which shows that the interaction between the general linked transaction rule and reliefs can be complex. You cannot always calculate SDLT correctly by looking only at section 55 in isolation.

Finally, HMRC’s manual is guidance on HMRC’s view and operation of the rules. The legal force comes from the legislation itself, especially Finance Act 2003. In most cases the manual is a useful explanation, but if a point is disputed, the statute is what governs the result.

Key takeaways

• SDLT is charged using a marginal rate system, so each rate applies only to the slice of consideration within that band.
• The correct rates depend not just on price, but also on whether the land is wholly or partly non-residential and whether there are linked transactions.
• Linked transactions can change the rate calculation significantly because the bands are normally applied by reference to the total consideration for all linked transactions together.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Introduction to SDLT: Tax Rates, Calculations, and Linked Transactions Guidance

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