---
title: "Stamp duty land tax (SDLT) — Class A Atlas glossary"
description: "UK transaction tax on lease grants and assignments."
canonical: https://classa.info/glossary/stamp-duty-land-tax
pageType: glossary
lastUpdated: 2026-04-01T00:00:00.000Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> UK transaction tax on lease grants and assignments.

## TL;DR

- UK transaction tax on lease grants and assignments.
- Calculated on the net present value of the lease rent.

# Stamp duty land tax (SDLT)

*Tax · UK*

## Short definition

UK transaction tax on lease grants and assignments.

## Full definition

Calculated on the net present value of the lease rent. Long [Class A](/glossary/class-a) leases attract material SDLT — typically 1% on the NPV above a threshold. Front-loaded relative to occupancy cost.

## Why this matters for Class A leasing

Stamp duty land tax (SDLT) is part of the tax vocabulary that institutional Class A occupiers, landlords, and advisers use across UK markets. Understanding it correctly affects how you read lease documents, model occupancy economics, and benchmark deal terms across cities. Class A Atlas tracks the UK definition alongside the global standard so [cross-border](/topics/cross-border-expansion) occupiers can translate quickly.

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Citation: Source: Class A Atlas (https://classa.info/glossary/stamp-duty-land-tax), updated 2026-04-01T00:00:00.000Z.