Understanding SDLT on Options and Rights of Pre-emption: Example with Mr. Smith

SDLT on a Residential Property Option That Is Later Exercised

If someone pays for an option to buy a residential property and later completes the purchase, HMRC treats the option and the purchase as two separate land transactions that are linked. This means the option fee is not ignored: once the option is exercised, two SDLT returns may be needed, and the tax is worked out on the combined value before being split between the option fee and the purchase price.

• A paid option to buy land can itself count as a land transaction for SDLT, even though the buyer does not yet own the property.
• If the option is exercised, the original option grant and the later property transfer remain separate transactions, but they are linked for SDLT.
• HMRC’s example says that, on completion of the purchase, two SDLT returns should be filed: one for the option and one for the transfer.
• Each return shows its own consideration, but both must show the total linked value made up of the option fee plus the purchase price.
• The SDLT is calculated on the total linked consideration at the residential rates in force when the purchase completes, then apportioned between the two transactions.
• This can be easy to miss in practice, especially where the option was not notifiable when first granted and HMRC may need an explanation to avoid an apparent late filing issue.

Scroll down for the full analysis.

SDLT on an option to buy residential property: how the tax works when the option is later exercised

This page explains how SDLT can apply where someone pays for an option to buy a property and then later completes the purchase. The key point is that the option and the eventual purchase are treated as separate land transactions, but they are also linked. That affects both the filing position and how the tax is calculated.

What this rule is about

An option to buy land is itself capable of being a land transaction for SDLT purposes. That can be surprising, because the buyer does not yet own the property and may never go on to buy it. But paying for the right to acquire land can still fall within the SDLT rules.

Where the option is later exercised and the property is transferred, there are then two transactions to consider:

• the original grant of the option, and
• the later transfer of the property following exercise of the option.

The official example deals with a residential property option fee that is paid separately from the eventual purchase price. It shows how SDLT returns and SDLT calculations are handled when the option is exercised.

What the official source says

In HMRC’s example, a buyer pays £5,000 for an option to buy a house for £250,000. The £5,000 is only for the right to purchase. It is additional to the £250,000 purchase price.

HMRC says the grant of the option is a land transaction in its own right, but it is not the acquisition of a major interest in the land. On the facts given, no part of the consideration for the option is chargeable at more than 0%, so that transaction is not notifiable at that stage. No SDLT return is required when the option is granted.

When the option is later exercised and the purchase completes, the transfer of the property is a separate land transaction. However, the option grant and the later transfer are linked transactions.

Once the option is exercised and the purchase completes, HMRC says two SDLT returns must be filed:

• one for the grant of the option, and
• one for the transfer following exercise of the option.

Both are treated as relating to residential property.

For the option return, HMRC says the return should show:

• the option fee as the consideration for that transaction, and
• the total linked value, being the option fee plus the purchase price.

For the transfer return, HMRC says the return should show:

• the purchase price as the consideration for that transaction, and
• the same total linked value.

HMRC also states that the effective date of the option transaction remains the date the option was granted, but notification is only required within 14 days of completion of the sale. Because the online return does not neatly fit this scenario, HMRC says an accompanying letter should be sent to the Stamp Office explaining why there is no late filing charge for the option return.

As to the tax itself, HMRC’s example calculates the SDLT by first working out the tax on the aggregate linked consideration of £255,000 at the residential rates in force when the purchase completes. That total tax is then split proportionately between:

• the £5,000 option fee, and
• the £250,000 paid on completion.

What this means in practice

The practical effect is that you do not simply ignore the option fee when the property is eventually bought. If the option is exercised, that fee becomes part of the linked transaction analysis.

There are three main consequences.

• The option and the purchase are not collapsed into one transaction. They remain separate transactions.
• They are nevertheless linked, so the SDLT calculation looks at the combined value.
• A transaction that was not notifiable when first entered into may still need to be reported later once the option is exercised and the sale completes.

This matters because a buyer or conveyancer might otherwise assume that only the purchase return is needed at completion. HMRC’s example says that is not enough. If the option has been exercised, a separate return for the option grant is also required.

The example also shows that the SDLT rates applied are those appropriate to the underlying land. Here, because the property is residential, the residential SDLT rates apply to the option consideration as well.

How to analyse it

If you are dealing with an option arrangement, a sensible way to analyse it is to ask the following questions.

1. Is there a separate payment for the option itself?

Start by identifying whether any amount is paid for the grant of the option, as distinct from the eventual purchase price. In HMRC’s example, the £5,000 is paid solely for the right to buy and is additional to the £250,000 purchase price.

2. What type of land is involved?

The nature of the underlying property matters. In the example, the property is residential, so residential rates apply.

3. Was the option transaction initially notifiable?

HMRC’s example says the grant of the option was a land transaction, but not the acquisition of a major interest. On the facts given, no part of the consideration was chargeable above 0%, so it was not notifiable at that stage.

That does not mean it can be forgotten. If the option is later exercised, HMRC says a return for that earlier transaction must then be filed.

4. Has the option been exercised and the sale completed or been substantially performed?

If yes, there is now a second land transaction: the transfer of the property. The effective date for that second transaction is the completion date or, if earlier, the date of substantial performance.

5. Are the two transactions linked?

HMRC’s answer in this example is yes. That means the SDLT calculation is based on the aggregate consideration across both transactions.

6. Have both returns been prepared correctly?

On HMRC’s approach, each return shows the consideration for that specific transaction, but also the total linked value. In the example:

• the option return shows £5,000 consideration and £255,000 linked value, and
• the transfer return shows £250,000 consideration and £255,000 linked value.

7. Has the tax been apportioned correctly?

HMRC’s example does not charge SDLT twice on the full amount. Instead, it calculates the total tax on the aggregate linked consideration and then apportions that tax between the two transactions by reference to their relative values.

Example

Illustration based on HMRC’s example:

• 1 January 2020: a buyer pays £5,000 for an option to buy a house.
• The agreed purchase price if the option is exercised is £250,000.
• 1 December 2020: the buyer exercises the option and completes the purchase.

HMRC treats this as follows:

• The option grant is a separate land transaction.
• The later transfer is another separate land transaction.
• The two are linked transactions.
• Two SDLT returns are required once the purchase completes.

HMRC then works out the SDLT by first calculating the tax on the total linked consideration of £255,000 at the residential rates in force on 1 December 2020. In the example, that total tax is £2,750.

That total is then split proportionately:

• the £250,000 completion payment bears 250,000/255,000 of the total tax, producing £2,696, and
• the £5,000 option fee bears 5,000/255,000 of the total tax, producing £54.

So although there was no SDLT payable on the option grant when it was first made, SDLT becomes due in relation to that option fee once the option is exercised and the linked purchase completes.

Why this can be difficult in practice

There are several points that can catch people out.

First, the grant of an option may look commercially like a preliminary step rather than a taxable event. But HMRC’s example treats it as a land transaction in its own right.

Second, the filing position is unusual. The effective date of the option transaction is the original grant date, but HMRC says notification is only required after the later completion of the sale. That can look like a late filing issue unless the return is explained properly. HMRC’s example specifically refers to sending a letter to explain why no late filing charge should arise.

Third, the calculation is not intuitive. A person might assume the option fee is either ignored or simply added to the purchase price and taxed once. HMRC’s example instead preserves two separate transactions and apportions the total tax across them.

Fourth, the example is fact-specific. It assumes:

• the option fee is genuinely separate from the purchase price,
• the underlying property is residential,
• the buyer is replacing a main residence so the higher rates do not apply, and
• the option is actually exercised.

If those facts change, the SDLT outcome may also change. For example, the applicable rates, notifiability position, or treatment of the consideration may need separate analysis.

Key takeaways

• A paid option to buy land can itself be a land transaction for SDLT purposes.
• If the option is later exercised, the option grant and the transfer are separate but linked transactions, and HMRC says two returns are required.
• The SDLT is calculated by reference to the total linked consideration and then apportioned between the option fee and the completion payment.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Understanding SDLT on Options and Rights of Pre-emption: Example with Mr. Smith

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