FAQ 019 | What Is Stamp Duty Land Tax (SDLT)?

Author: SJW Research & Intelligence

Brand: SJW UK Properties

What is Stamp Duty Land Tax (SDLT)?

Stamp Duty Land Tax, usually shortened to SDLT, is the tax most commonly encountered when buying a home in the UK, and one that almost every buyer comes across. On a first enquiry, clients often ask: “Why is there a tax on buying a property at all?” Others ask whether everyone pays the same amount. The answer to both is no. SDLT is not a fixed sum. It is calculated according to the tax rules in force at the time, the price of the property, the intended use and the buyer’s own circumstances, so the amount payable differs from buyer to buyer.

When is Stamp Duty paid?

SDLT is normally dealt with after completion, when the buyer’s solicitor files the return and arranges payment based on the details of the transaction. Buyers do not usually need to deal with HMRC themselves, although the exact arrangements are a matter for the solicitor.

Why do different buyers pay different amounts?

Since 2015 we have found this to be the point clients most often misunderstand. Many say: “A friend bought a property and paid this much. Why is mine different?” In practice, SDLT takes account of a range of factors, for example:

 the purchase price;

 whether the property is a main home or an investment;

 the buyer’s status and their existing property interests at the time;

 the tax rules the government has in force at the time.

As a result, two buyers purchasing in the same development, or even in the same building, may pay different amounts of Stamp Duty.

Does Stamp Duty policy change?

Yes. UK property tax policy changes with government fiscal policy and market conditions. We have seen several changes to Stamp Duty since 2015. We therefore always advise clients not to judge today’s position by an experience from several years ago, and to calculate the figure on the rules in force at the time of the purchase.

In business since 2015: the figure is not the only thing worth thinking about

Many clients spend considerable time working out how much Stamp Duty they will pay. In our experience, the questions worth asking earlier are these: why is the property being held in this way? Will more properties follow? Will it be let over the long term? Will it be sold? Each of these decisions shapes the family’s long-term asset planning. Stamp Duty is only one part of the tax picture.

SJW Insight

Since 2015 we have become increasingly convinced of the following. Many clients understand Stamp Duty as a cost of buying. It is better understood as the first step into the UK property tax system. Mature asset planning is not a matter of calculating what is payable today. It means beginning, at the point of the first purchase, to think about the arrangements for the years and decades to come. At SJW UK Properties we therefore always tell clients that understanding Stamp Duty matters, but understanding the UK property tax system as a whole matters more.

Last updated: July 2026

Disclaimer: This article is provided for general information only and does not constitute legal, tax or investment advice. UK Stamp Duty policy may change as government rules change. Your own position should be confirmed against the policy in force at the time of the transaction and the advice of a professional tax adviser and solicitor.