Securities Transfer Tax: What the New Single Share Tax Means for Investors (UK vs US, EU, Australia)

The UK is replacing two overlapping taxes on share transfers with a single new one. If you own individual shares outside a fund wrapper, it's worth understanding what's changing and when.

What's changing

Today, buying UK shares can trigger either of two separate taxes: Stamp Duty, a tax on physical paper stock transfer forms, and Stamp Duty Reserve Tax (SDRT), charged on electronic transfers processed through CREST — both currently levied at 0.5%. Having two taxes doing essentially the same job, on different mechanics, has long been seen as needlessly complex.

Following a 2023 consultation, the government intends to replace both stamp taxes on shares with a single, mandatory, self-assessed tax on securities — a new Securities Transfer Tax (STT). On 13 July 2026, HMRC published its policy paper on this "Modernisation of the Stamp Taxes on Shares" framework, which is intended to simplify and fully digitise administration of the tax. It's currently proposed the new tax will be introduced in 2027, so nothing changes immediately, but the mechanics of how you and your broker settle the tax will look different once it lands.

Why it matters for ordinary investors

For most retail investors, the headline rate itself isn't expected to change dramatically — it's the administration that's being modernised. Currently, if you buy electronically-settled shares, your broker or CREST typically deducts SDRT automatically and you never see the mechanics; if you're involved in paper transfers (rarer today, but relevant for some private company shares or older holdings), you separately owe Stamp Duty and must pay it within 30 days of the document being signed. A single, self-assessed tax removes that two-track system, which should reduce confusion — particularly for anyone dealing with unlisted or private company shares, where the current split between the two taxes causes the most practical difficulty. There's no stamp duty payable currently on transfers under £1,000, and it's not yet confirmed whether that exemption threshold carries over unchanged into the new STT.

What to watch for

Because the reform is still at the policy-paper stage with a 2027 target, exact rates, exemptions and the self-assessment mechanics for retail investors haven't been finalised. Anyone who invests directly in individual UK shares — rather than through a fund or ISA wrapper, where this tax works differently again — should watch for the government's formal response to the 2023 consultation and any further draft legislation before assuming the current 0.5% rate and mechanics will simply carry over unchanged.

International comparison

Britain's 0.5% stamp tax on shares looks comparatively moderate next to some European neighbours, who have been moving in the opposite direction — raising, not simplifying, their transaction taxes. France raised its financial transaction tax from 0.3% to 0.4% on equity trades in 2025, while Italy doubled several of its rates from January 2026 — cash-equity trades on regulated markets rose from 0.1% to 0.2%, and off-market transfers from 0.2% to 0.4%. The US and Australia, by contrast, levy no general financial transaction tax on share purchases at all — the UK's approach sits between the higher-tax European model and the US/Australian model of no transaction tax whatsoever.

Key Numbers

• 0.5% — the current combined effective rate of Stamp Duty and SDRT on UK share transfers
• 2027 — proposed introduction year for the new Securities Transfer Tax
• 0.4% — France's equity transaction tax rate, for comparison, after its 2025 increase

Sources

• New single UK tax on share transfers to be introduced — Pinsent Masons
• Stamp Duty Reserve Tax (SDRT) Guide 2026 — calculatemystampduty.co.uk
• Tax update 2026: simplification, modernisation and fairness — GOV.UK
• Financial Transaction Taxes in Europe, 2026 — Tax Foundation

Educational content only — not financial advice.