Guide to Calculating Multiple Dwellings Relief and Additional Dwelling Supplement

How Multiple Dwellings Relief for LBTT is calculated

Multiple Dwellings Relief (MDR) for Scottish LBTT can reduce tax where more than one dwelling is bought, but it is not automatic. You must work out the tax using an average price per dwelling, consider whether the Additional Dwelling Supplement (ADS) applies, include any non-dwelling property and linked transactions, and then compare the result with a minimum tax amount. In some cases, claiming MDR gives no benefit.

• MDR usually works by dividing the total price for the dwellings by the number of dwellings, calculating LBTT on that average figure, and then multiplying back across the dwellings.
• If the purchase includes non-dwelling property, the price must be split between dwellings and other property on a just and reasonable basis, and the non-dwelling element is brought in through a separate calculation.
• If ADS applies, it must be added only for the dwellings to which it applies; if 6 or more dwellings are bought in one transaction, they can instead be treated as non-residential and ADS will not apply.
• The final tax after MDR is the higher of the MDR calculation and the minimum prescribed amount, which is currently 25% of the tax attributable to the dwellings.
• Linked transactions can change the average price per dwelling, so they must be included when working out the dwelling element of the calculation.
• MDR is not always worth claiming, so buyers should check the figures carefully and keep records showing how any apportionment and calculation were reached.

Scroll down for the full analysis.

How to calculate Multiple Dwellings Relief for LBTT

This page explains how Multiple Dwellings Relief, or MDR, is calculated for Land and Buildings Transaction Tax in Scotland. The official rules are technical, especially where the Additional Dwelling Supplement, or ADS, also applies, or where a transaction includes both dwellings and non-dwellings. The key point is that MDR does not simply reduce tax automatically. You must work through a set calculation, compare the result with a minimum tax amount, and then decide whether claiming the relief actually helps.

What this rule is about

MDR applies where a transaction involves more than one dwelling. Broadly, it works by averaging the price attributable to the dwellings, calculating the tax on that average figure, and then multiplying back by the number of dwellings. That can reduce the tax because lower-value dwellings may fall into lower tax bands than the total price would suggest.

But the calculation has safeguards. In particular:

• you must identify the part of the price attributable to dwellings and, if relevant, the part attributable to other property on a just and reasonable basis
• you must calculate tax differently depending on whether ADS applies
• there is a minimum prescribed amount, currently 25% of the tax attributable to the dwellings, below which the MDR result cannot fall
• where 6 or more dwellings are bought in one transaction, those dwellings are treated as non-residential for LBTT purposes, and ADS does not apply if that treatment is used

This matters because mixed transactions, linked transactions, and purchases involving replacement main residences can all change the figures significantly.

What the official source says

The source material sets out a formula-based approach using these abbreviations:

• DT: tax due in relation to a dwelling
• ND: number of dwellings forming the main subject-matter of the transaction
• RT: tax due in relation to remaining property that is not a dwelling
• ∑DT: the sum of tax due where ADS applies
• TT: total tax due if no MDR were claimed
• MPA: minimum prescribed amount, currently 25%

Where ADS does not apply, the dwelling part of the MDR calculation is based on DT multiplied by ND. Where ADS does apply, the dwelling part becomes ∑DT.

To calculate DT, you:

• find the total consideration attributable to all dwellings in the transaction
• for linked transactions, add in the consideration attributable to dwellings in the other relevant linked transactions
• divide that total by the total number of dwellings to get the average consideration per dwelling
• calculate LBTT on that average figure using residential rates and bands, as if the transaction were not linked

You then multiply DT by ND to get the dwelling element of the tax.

If ADS applies, you still start with the average consideration per dwelling. But instead of using one single DT figure, you calculate the tax due for each dwelling on that average figure and add ADS only where it applies. The total of those figures is ∑DT.

TT is the total tax that would be due if MDR were not claimed. The source says this is calculated using the relevant rates and bands for the transaction, with special treatment for purchases of 6 or more dwellings in one transaction, which are treated as non-residential and do not attract ADS.

RT is worked out by:

1. calculating the tax that would be due for the whole transaction if MDR were not claimed
2. dividing the consideration attributable to non-dwelling property by the total consideration
3. multiplying the total tax by that fraction

MPA is calculated as:

(TT − RT) × 25%

The amount payable after MDR is the higher of:

• (DT × ND) + RT, or ∑DT + RT where ADS applies
• MPA + RT

The amount of MDR is the difference between TT and the amount actually payable after applying that comparison.

What this means in practice

The practical effect is that MDR is not just a matter of dividing the purchase price by the number of dwellings and applying residential rates. You must also check:

• whether any part of the property is not a dwelling
• whether ADS applies to all dwellings, some dwellings, or none
• whether the transaction is linked with others
• whether 6 or more dwellings are being bought in one transaction
• whether the minimum prescribed amount overrides the lower MDR result

In some cases MDR gives a substantial reduction. In others it gives no benefit at all. The source expressly says that claiming MDR may not be beneficial and that whether to claim is a decision for the buyer.

This can happen because the amount payable is the higher of the MDR-style calculation and the minimum prescribed amount. If the ordinary tax without relief is already lower than the MDR result, then claiming MDR does not reduce the tax.

The source also stresses record-keeping. You should retain evidence of how you arrived at the MDR calculation, including any apportionment between dwellings and other property, because Revenue Scotland may ask to see it.

How to analyse it

A sensible way to approach an MDR calculation is to work through these questions in order.

1. How many dwellings are there?

You need the total number of dwellings forming the main subject-matter of the transaction. This drives the averaging calculation.

2. Is all the property residential?

If the transaction includes shops, offices, land, or other property that is not a dwelling, you must split the total consideration between:

• the dwellings
• the remaining property

The source says this split must be made on a just and reasonable basis.

3. Are there linked transactions?

If there are, the consideration attributable to dwellings in the linked transactions must be added in when calculating the average consideration per dwelling.

4. Does ADS apply?

This is crucial. There are several possibilities:

• ADS applies to all dwellings
• ADS applies to some dwellings only, for example because one dwelling is a replacement main residence
• ADS does not apply at all
• 6 or more dwellings are bought in one transaction, so they are treated as non-residential and ADS does not apply if that treatment is used

Where ADS applies only to some dwellings, the source says you calculate the tax on each dwelling individually using the average consideration figure, adding ADS only for the dwellings to which it applies.

5. Calculate the dwelling element

Take the average consideration per dwelling. Then:

• apply residential rates and bands to that average figure
• if relevant, add ADS for the dwellings to which it applies
• multiply or aggregate across the dwellings to get DT × ND or ∑DT

6. Calculate TT

Work out the total tax due for the whole transaction if MDR were not claimed. The source says:

• use residential rates where appropriate
• include ADS where applicable
• if 6 or more dwellings are included in one transaction, treat them as non-residential and do not include ADS

7. Calculate RT if there is non-dwelling property

RT is not worked out by taxing the non-dwelling property separately. Instead, it is a fraction of the total tax without relief. That fraction is based on the share of the total consideration attributable to non-dwelling property.

8. Calculate the minimum prescribed amount

Subtract RT from TT, then take 25% of the result. That gives MPA.

9. Compare the figures

The tax payable after MDR is the higher of:

• the dwelling calculation plus RT
• MPA plus RT

The relief itself is then TT minus that payable amount.

Example

Illustration: a buyer acquires 4 dwellings for £1,200,000, and ADS applies to all 4.

The average consideration per dwelling is £300,000. The source calculates LBTT on that average figure at £4,600 per dwelling, and ADS at £24,000 per dwelling, giving £28,600 per dwelling. Across 4 dwellings, ∑DT is £114,400.

Without MDR, the total tax TT is £198,350.

There is no non-dwelling property, so RT is £0. The MPA is therefore 25% of £198,350, which is £49,587.50.

The amount payable is the higher of:

• ∑DT + RT = £114,400
• MPA + RT = £49,587.50

So the tax payable is £114,400. The MDR claimed is the difference between TT and that figure, which is £83,950.

This example shows the basic structure clearly: calculate the MDR amount, calculate the minimum amount, and then use the higher of the two.

Why this can be difficult in practice

The source material highlights several areas where care is needed.

First, apportionment can be contentious. If a transaction includes dwellings and other property, the price must be split on a just and reasonable basis. That is a judgement exercise. The source does not give a fixed method, so the quality of the evidence behind the apportionment matters.

Secondly, ADS may apply to some dwellings but not all. The source gives the example of a replacement main residence. In that situation, you still use the average consideration per dwelling, but you must add ADS only to the dwellings to which it applies. That can feel counterintuitive because the actual values of the individual dwellings may differ, yet the MDR method uses an average figure for the dwelling calculations.

Thirdly, the 6 or more dwellings rule changes the whole framework. The source says that where 6 or more residential properties are bought in a single transaction, they are treated as non-residential and ADS does not apply. That can produce very different outcomes from an ordinary MDR calculation.

Fourthly, MDR is not always worth claiming. The source includes an example where the MDR calculation produces a negative relief figure, meaning the tax payable with MDR would be higher than the tax otherwise due. In practical terms, that means there is no benefit in claiming the relief.

Finally, the source examples contain some numerical inconsistencies in a few places, even though the overall method is clear. For that reason, the safest approach is to focus on the calculation sequence and check each arithmetic step carefully rather than relying on one example figure in isolation.

Key takeaways

• MDR for LBTT is based on averaging the consideration attributable to dwellings, but the final amount payable is subject to a 25% minimum prescribed amount.
• If ADS applies, you must calculate the dwelling tax using the average consideration and add ADS only for the dwellings to which it applies.
• MDR does not always reduce tax, so you must compare the figures carefully and keep evidence of any apportionment and calculation used.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Guide to Calculating Multiple Dwellings Relief and Additional Dwelling Supplement

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