If you have spent any time in property circles lately, you have heard the pitch: move your buy-to-lets into a limited company and save a fortune in tax. It is one of the most repeated pieces of advice in UK property investing, and like a lot of repeated advice, it is only half right.
The saving people are talking about is almost always an income tax saving. When the conversation drifts to stamp duty, the story quietly falls apart. On stamp duty, a limited company usually pays the same as an individual buying a second property, and in some cases it pays dramatically more. If you incorporate expecting a stamp duty discount, you have misunderstood the bill.
Here is what actually happens, and why it matters before you set up a special purpose vehicle (SPV).
Stamp duty is charged in slices, not as one flat rate
The first thing to get straight is how the tax is built, because most of the confusion starts here. Stamp Duty Land Tax in England and Northern Ireland is progressive. You do not pay one percentage of the whole price. You pay a different rate on each slice of the purchase price as it passes through the bands.
For a standard residential purchase in 2026, the bands are nil up to £125,000, 2% on the portion from £125,000 to £250,000, 5% from £250,000 to £925,000, 10% from £925,000 to £1.5 million, and 12% on anything above that. Because it is banded, the effective rate you actually pay is always lower than the top band you reach. Before you run any incorporation numbers, it is worth pulling a baseline figure from a stamp duty calculator so you know the exact personal cost you are comparing against.
That baseline matters, because the company route is measured against it.
A company almost always pays the surcharge
Here is the part the “save tax” pitch skips. The additional property surcharge, currently 5% on top of the standard rates, applies to purchases of £40,000 or more. It was raised to 5% from 3% in the autumn 2024 changes, and it is not a small line item.
A limited company buying residential property is caught by that surcharge on essentially every purchase. A company has no concept of a “main home,” so it can never sidestep the higher rates the way an individual buying their only property can. That means the honest comparison is not company versus a first-time buyer. It is a company versus an individual who is already buying an additional property. Once you frame it that way, the supposed advantage disappears, because at this level both routes land on the same number.
The “17% company rate” is real, but it is not what most landlords think
This is where a genuine myth has taken hold. People hear that companies pay a flat 17% on residential property and assume every corporate purchase is punished at that rate. That is not how it works.
The flat 17% rate, which rose from 15% on 31 October 2024, only applies to residential purchases above £500,000 bought by a “non-natural person” such as a company, and only when no relief applies. Crucially, a genuine property rental business can claim relief and be taxed at the normal rates instead, which is standard rates plus the 5% surcharge. In practice most bona fide buy-to-let companies never touch the 17% figure. The flat rate is really aimed at “enveloped” dwellings, homes bought inside a company for a connected individual to live in, rather than at ordinary landlords.
The trap is the £500,000 line and the relief question sitting right on top of it. Get the relief position wrong on a purchase above that threshold and the cost is not marginally higher, it is catastrophic. This is exactly the kind of divergence worth modelling before you commit, and a purpose-built limited company stamp duty calculator will show you where the personal and corporate paths split.
You can also read HMRC’s guidance on higher rates for corporate bodies for the statutory detail.
The numbers, side by side
Take a £300,000 buy-to-let. An individual buying it as an additional property pays £5,000 in standard duty plus a £15,000 surcharge, so £20,000 in total. A company buying the same property, claiming rental business relief, pays the same £20,000. There is no stamp duty saving from incorporating at this price. None.
Now push the price to £600,000. The individual, or a company with relief, pays £20,000 standard plus a £30,000 surcharge, so £50,000. But a company caught by the flat 17% rate with no relief available would pay £102,000 on the same property. That is a £52,000 gap created entirely by the relief position on one purchase. The 17% rate rarely bites, but when it does, it is brutal.
So why do people still incorporate?
Because the real case for a company was never about stamp duty. It is about income tax. Since the Section 24 rules restricted mortgage interest relief for individual landlords, higher-rate taxpayers with leveraged portfolios often pay less overall inside a company, where finance costs remain fully deductible and profits are taxed at corporation tax rates rather than personal income tax rates. Add retained earnings flexibility and cleaner succession planning, and incorporation can still make sense.
The point is simply this: stamp duty is a cost you accept in exchange for those benefits, not a saving the company structure hands you. Anyone selling incorporation as a stamp duty play has the mechanics backwards.
What about Scotland and Wales?
The 17% figure and the SDLT bands above are England and Northern Ireland only. Property taxes are devolved, so the picture shifts if you buy elsewhere.
In Scotland, companies pay Land and Buildings Transaction Tax (LBTT) rather than SDLT, and the Additional Dwelling Supplement now stands at 8% on the whole price, a heavier surcharge than the English 5%. In Wales, companies pay Land Transaction Tax (LTT), which uses a completely separate set of higher residential rate bands for additional properties rather than a flat add-on percentage. Neither nation offers first-time buyer relief to a company, for the same reason England does not. The headline stays the same across all three systems: buying inside a company does not reduce the transaction tax, and often increases it.
Before you set up an SPV
A short checklist. Model the stamp duty on both the personal and corporate route for the specific price you are buying at, not a rule of thumb. If the purchase is above £500,000, confirm in advance whether rental business relief applies, because that single answer can swing the bill by tens of thousands. Remember the 5% surcharge lands on the company from the first pound over £40,000. Check which nation’s rules apply, because Scotland and Wales change the maths. And keep the income tax decision separate from the stamp duty decision, because they pull in different directions and only one of them favours the company.
Frequently asked questions
Do you pay stamp duty when buying property through a limited company? Yes. A limited company pays Stamp Duty Land Tax on residential purchases just like an individual, and because a company cannot own a “main home,” it also pays the 5% additional property surcharge on almost every purchase of £40,000 or more.
Is it cheaper to buy property through a limited company? Not on stamp duty. Below £500,000 a company pays exactly the same as an individual buying an additional property. Above £500,000 it can pay considerably more if the 17% flat rate applies. Any overall saving from incorporating comes from income tax treatment, not from the purchase tax.
When does the 17% corporate stamp duty rate apply? Only to residential purchases above £500,000 by a company or other non-natural person where no relief applies. A genuine property rental business usually claims relief and is taxed at standard rates plus the 5% surcharge instead. The flat rate is aimed mainly at homes a company buys for a connected person to occupy.
Did the corporate stamp duty rate change recently? Yes. The flat corporate rate rose from 15% to 17% on 31 October 2024, and the additional property surcharge rose from 3% to 5% in the same period. Purchases completed on or after those dates use the new figures.
The bottom line
Property investing rewards people who run the numbers before they sign, not after. Incorporating a portfolio can be a smart income tax decision for the right investor. It is almost never a stamp duty one. On SDLT, the numbers rarely say what the headlines promise, so model your own before you let a myth make the call.
