The 17% Stamp Duty Rate Explained

From 15% to 17%: The Rate History

The higher rate for non-natural persons was introduced in April 2012 as part of measures to discourage the use of corporate "enveloping" to avoid stamp duty. When first introduced, it was set at 15%.

In October 2024, as part of the Autumn Budget, the rate was increased to 17%, effective immediately. The increase applied to all completions on or after the Budget date, with no transitional arrangements for existing contracts.

The £20,000 increase on a £1 million property makes the rate change one of the largest single SDLT increases for any buyer category in recent years.

Who the 17% Rate Applies To

The 17% rate applies to "non-natural persons" — a legal term covering entities that are not individual human beings. Under HMRC corporate bodies guidance, this includes:

Individual buyers — including very wealthy individuals, celebrities, and family offices operating through personal names — are natural persons. No individual, regardless of wealth or number of properties, pays the 17% rate.

The £500,000 Threshold: Critical Mechanics

The 17% rate applies when a non-natural person purchases a residential property for more than £500,000. The mechanics are different from how most SDLT bands work:

• At £500,000: standard residential rates plus 5% surcharge (total approx £38,750)
• At £500,001: 17% flat rate on the entire £500,001 = £85,000
• This creates a "cliff edge" of approximately £46,250 at the threshold

Companies should consider whether it is possible to structure transactions to keep the purchase price at or below £500,000, or whether a qualifying relief can be obtained for transactions above this threshold.

Rate Comparison: Company vs Individual

Who Is Exempt from the 17% Rate

Several categories are explicitly exempt or can obtain relief:

How the Surcharges Stack

For non-natural persons, multiple SDLT elements can stack. Here is the complete picture for a UK-resident company vs a non-resident company, both buying a £1 million residential property:

Note: when a qualifying relief applies, the 17% flat rate is replaced by standard tiered rates plus the 5% additional dwelling surcharge. The non-resident surcharge may still apply separately.

Individual vs Company: The Full SDLT Comparison

The critical distinction in SDLT treatment between individuals and companies is that:

• Individuals: pay tiered rates on each portion of the purchase price, plus the 5% surcharge if purchasing an additional property. Tiered rates cap at 12% on the portion above £1.5m.
• Companies: pay 17% on the entire purchase price if it exceeds £500,000 — there are no tiered bands. Below £500,000, companies pay tiered rates plus the 5% surcharge.

For property below £500,000, there is no difference between company and individual SDLT when both are purchasing an additional dwelling. The gap only opens above the £500,000 threshold.

Worked Examples

Example 1: Company buying £750,000 house — no relief

Example 2: Same property, individual buyer (additional dwelling)

Reliefs That Remove the 17% Rate

When a qualifying relief applies, the 17% flat rate is replaced by standard residential SDLT rates (the tiered bands) plus — in most cases — the 5% additional dwelling surcharge. See the detailed breakdown in our property developer exemptions guide.

The most commonly claimed relief is property rental business relief, which applies to companies and SPVs genuinely carrying on a letting business. For companies buying over £500,000 for a letting portfolio, this relief can save £50,000–£100,000 or more on a single transaction.

For a full corporate comparison with personal ownership, use our company vs personal comparison page and the calculator. For SPV-specific considerations, see our SPV guide.

How to Claim Relief from the 17% Rate

Relief from the 17% rate is not automatic — it must be actively claimed on the SDLT return. The relevant form is SDLT1 (the main land transaction return), which must be submitted to HMRC within 14 days of completion. In practice, the company's solicitor or conveyancer handles this claim on behalf of the buyer as part of the standard post-completion process.

Documentation Required

The nature of the supporting documentation depends on the relief category claimed. For property rental business relief — the most commonly claimed — relevant evidence includes a business plan or statement of intent to let the property commercially, existing tenancy agreements if the company already has a rental portfolio, and minutes or board resolutions recording the commercial purpose of the acquisition. For developer/trader relief, documentation of the development timeline, planning permission status, and commercial resale plans will be required. For employee occupation relief, employment contracts confirming the relevant employee's role are needed.

HMRC Enquiry Risk

HMRC can open an enquiry into a relief claim within 9 months of the filing date of the SDLT return. Where a return is filed late, the 9-month window runs from when it is actually filed. In cases of negligent or fraudulent claims, HMRC has extended powers to go back further — up to 20 years in the most serious cases.

The practical consequence is that all evidence supporting the relief claim — business plans, board minutes, tenancy agreements, correspondence — should be retained for at least 6 years after filing (the standard HMRC record retention period), or longer where there is any uncertainty about the claim's strength. Specialist tax advice before filing is strongly recommended for any claim involving the 17% rate.

Sources

1. GOV.UK — SDLT for corporate bodies
2. GOV.UK — Residential property SDLT rates
3. GOV.UK — SDLT relief for land or property transactions

Frequently Asked Questions About the 17% Corporate SDLT Rate