Stamp Duty Explained (And Why Thresholds Distort Decisions)

Stamp duty is a one-off tax calculated on the purchase price, due shortly after completion. There is no negotiation and no meaningful workaround - yet it distorts buying decisions more than almost any other cost in the process. This guide explains how it works, where thresholds create pressure, and how to keep it in proportion.

How stamp duty bands work

You pay different rates on slices of the price, not a single flat rate on the total, which makes threshold proximity more significant than it first appears.

First-time buyer relief

Eligible buyers pay no SDLT up to a price threshold, but the relief reduces sharply or disappears once that threshold is crossed.

How stamp duty warps decision-making

Buyers sometimes rush to beat deadlines, stretch on price to complete, or over-value incentives that cover the bill.

A calmer way to think about the tax

Treating stamp duty as a fixed cost of entry rather than a variable to optimise usually leads to better decisions about the home itself.