Limited Company Buy-to-Let Mortgages: Who Actually Wins?
Buy-to-Let · 6 minute read
Limited Company Buy-to-Let Mortgages: Who Actually Wins?
By Kieran Ali, founder of CiK Finance · Published 28 July 2026
Key takeaways
- Many lenders stress-test a limited company buy-to-let at around 125% of the mortgage payment, against around 145% for a higher-rate taxpayer buying personally.
- On £1,150 monthly rent, that difference can mean roughly £27,000 more maximum borrowing through a company.
- Companies deduct mortgage interest as a business cost. Individuals get a basic-rate credit instead under the Section 24 rules.
- Corporation tax runs between 19% and 25% (2026/27), and profits are taxed again when you take them out of the company.
- The 5% additional-dwellings stamp duty surcharge applies whichever name goes on the deeds.
- Moving properties you already own into a company counts as a sale and repurchase. Take tax advice before touching an existing portfolio.
"Should I buy my next buy-to-let through a limited company?"
I hear this question most weeks now. It usually arrives second-hand, planted by someone's mate at a barbecue who read that companies pay less tax. And to be fair, the mate isn't entirely wrong. He's just answering a different question from the one that decides whether your purchase actually goes through.
The tax comparison is only half the sum. The other half is the mortgage maths, and almost nobody mentions it.
Why everyone suddenly recommends a limited company
The recommendation didn't come from nowhere. Since the Section 24 rules finished phasing in, individual landlords can no longer deduct mortgage interest from rental income in full. If you pay tax at 40% or 45%, you get a basic-rate credit instead, and that can turn a profitable rental into a marginal one on paper.
A company doesn't have that problem. Mortgage interest is a business cost, deducted before tax. Corporation tax currently sits between 19% and 25% depending on profits. For a higher-rate taxpayer building a portfolio and reinvesting the rent, the structure can genuinely work harder.
So yes, there's a real reason the barbecue advice exists. What bothers me is what gets left out.
The mortgage maths the recommendation skips
Lenders don't just price these loans differently. They test them differently.
Buy in your personal name as a higher-rate taxpayer and many lenders want the rent to cover around 145% of a stressed mortgage payment. The logic is simple enough: your rental profit gets taxed harder, so the cushion has to be bigger.
Buy through a limited company and that test commonly drops to around 125%, because the company isn't paying income tax at your rate.
Here's what that looks like with real numbers. Take a property renting at £1,150 a month, tested at a typical stress rate of 5.5%:
- Personal name at 145%: maximum loan around £173,000
- Limited company at 125%: maximum loan around £200,000
Same property. Same tenant. Same rent. Around £27,000 more borrowing capacity, decided entirely by whose name is on the deeds. Both figures are illustrations; every lender runs its own calculation, and any lending is subject to underwriting.
It cuts the other way too. Limited company products often carry slightly higher rates and fees, the lender pool is smaller (though it has grown every year), and you'll almost certainly sign a personal guarantee. The company borrows. You stand behind it.
What this looks like in practice
Here's the kind of case we work through most months.
A couple own two rentals in their personal names. Both higher-rate taxpayers. They find a third property at £240,000, offer accepted, deposit ready. Then the personal-name numbers come back short: the rent supports around £173,000 and they need £180,000.
At this point most people assume the deal is dead. The seller's agent is usually already talking about another buyer.
The move that saves it isn't a bigger deposit. Their accountant confirms a company structure suits their tax position, an SPV gets set up in an afternoon, and the same rent now passes the 125% test with room to spare. The purchase completes in the company's name.
The lesson isn't "companies win". It's that the ownership structure changed the affordability answer before anyone argued about rates. Ask that question before you offer, not after.
When buying personally still wins
A limited company is not the default right answer, whatever the barbecue says.
If you pay basic-rate tax, Section 24 barely touches you, and the company route mostly adds cost and admin. If you need the rent to live on now, remember company profits are taxed twice on their way to your pocket: corporation tax first, then dividend tax when you draw them out. And over a short time horizon, the setup costs, annual accounts and slightly pricier lending may never pay themselves back.
Be especially careful with anyone who casually suggests "moving" properties you already own into a company. The tax system treats that as a sale and repurchase. Stamp duty applies, including the 5% additional-dwellings surcharge. Capital gains tax may apply. Any early repayment charges on existing fixed rates land on top. There are routes some portfolio landlords use to manage this, but that's a conversation for a qualified tax adviser, not a social post.
What to do with this
The order matters more than the answer.
First, the structure conversation with your accountant: your tax band, your horizon, whether the rent gets reinvested or spent. Then, before you offer on anything, the lending numbers both ways. We run personal-name and limited-company affordability side by side, so you can see what each structure actually supports. And because complex cases are what we do, we can, in certain cases, place the harder versions of both.
If a purchase is on your radar this year, get the structure question answered first. It's a short conversation, and it beats finding out at application stage.
Frequently asked questions
Do limited company buy-to-let mortgages have higher interest rates?
Often slightly, yes. The gap has narrowed as more lenders have entered the market, and the gentler stress test can outweigh the rate difference by supporting more borrowing. Compare the total cost, not just the headline rate.
Do I need a special type of company for a buy-to-let mortgage?
Most lenders prefer an SPV: a company that exists only to hold property, registered with the right SIC codes. Setting one up takes less than a day, and your accountant can do it alongside the structure advice.
Can I transfer buy-to-lets I already own into a company?
Legally yes, but the tax system treats it as a sale and repurchase. Stamp duty (including the 5% surcharge), possible capital gains tax and any early repayment charges all apply. Larger portfolios sometimes have specific routes available, but they need proper tax advice. Never do this casually.
Will I need a personal guarantee for a limited company mortgage?
Almost always. The company is the borrower and the directors personally guarantee the loan. Lenders treat the company as the structure, not the security.
Is a limited company better for tax on buy-to-let?
Sometimes. It depends on your tax band, whether you reinvest or draw the rent, and how long you plan to hold the properties. That call belongs with your accountant or a qualified tax adviser. Our job is making sure the lending works whichever way the tax advice points.
Thinking about your next purchase?
We'll run the numbers both ways, personal name and limited company, before you commit to either. No obligation.
Kieran Ali is the founder of CiK Finance, a specialist mortgage and protection firm working with company directors, portfolio landlords and clients with complex income. CiK Financial Ltd is an appointed representative of PRIMIS Mortgage Network, a trading name of Advance Mortgage Funding Limited, which is authorised and regulated by the Financial Conduct Authority.
Information correct at the time of publication (28 July 2026) and subject to change. Figures shown are illustrations only; any lending is subject to underwriting, and criteria can change depending on circumstances. Tax treatment depends on individual circumstances and may change; CiK Finance does not provide tax advice, so please speak to your accountant or a qualified tax adviser.
Most Buy-to-Let Mortgages are not regulated by the Financial Conduct Authority.
Your home may be repossessed if you do not keep up repayments on your mortgage.