Buy-to-let (BTL) has long been a popular route to building wealth in the UK, but the landscape has changed significantly over the past decade. Rising mortgage rates, the Section 24 mortgage interest restriction, a 5% stamp duty surcharge on additional dwellings and tighter regulation have all squeezed margins. This guide cuts through the noise and gives you an honest picture of what BTL looks like in 2026/27.
The honest answer is: it depends. For landlords who bought years ago on low fixed rates with modest leverage, BTL can still generate solid returns. For anyone buying fresh in 2026, the numbers are considerably tighter.
The main headwinds are:
On the positive side, rental demand across the UK remains high, rental growth has been strong in many regions, and long-term capital appreciation in property has historically been resilient. BTL can still make sense for the right property at the right price with the right financing · but thorough due diligence is essential.
When you purchase an additional residential property (including buy-to-let investments), you pay a 5% surcharge on top of the standard Stamp Duty Land Tax (SDLT) rates. This applies to the entire purchase price on properties costing more than £40,000 and kicks in from the first pound · there is no nil-rate band for additional dwellings.
The effective SDLT rates for additional dwellings in England and Northern Ireland for 2026/27 are:
On a £250,000 buy-to-let property, the stamp duty bill alone is £12,500 · compared to £0 for a first-time buyer purchasing the same property as a main residence. This upfront cost must be factored into your return calculations from day one. Use our Stamp Duty Calculator to get an exact figure for any purchase price.
| Purchase Price | £300,000 |
| 5% on first £250,000 | £12,500 |
| 10% on £50,000 (£250,001 to £300,000) | £5,000 |
| Total SDLT Due | £17,500 |
Rental yield is the key metric for assessing whether a buy-to-let investment stacks up. It measures the annual rental income as a percentage of the property value, allowing you to compare investment properties on a like-for-like basis.
Gross yield is the simplest calculation:
Gross Yield = (Annual Rent ÷ Property Value) × 100
So a property worth £200,000 generating £10,000 in rent per year has a gross yield of 5%.
Net yield is more useful in practice because it accounts for the costs of owning and letting the property:
Net Yield = ((Annual Rent − Annual Costs) ÷ Property Value) × 100
Costs to deduct include letting agent fees (typically 10–15% of rent), insurance, maintenance, void periods (empty months), and any service charges or ground rent. Net yield will typically be 1–2 percentage points lower than gross yield.
As a rough guide, typical UK rental yields in 2026 range from 4% to 7% gross, with higher yields generally found in northern cities (Manchester, Liverpool, Leeds) and lower yields in London and the south-east. A gross yield below 5% will likely struggle to cover mortgage costs on a standard BTL mortgage at current rates.
Enter the purchase price, rental income and mortgage details to see your gross yield, net yield and monthly profit or loss.
Open Buy-to-Let Calculator →Section 24 of the Finance Act 2015 was phased in from 2017 and is fully in effect for 2026/27. It is arguably the most significant change to BTL taxation in a generation and is frequently misunderstood.
Under the old rules, landlords could deduct 100% of their mortgage interest from rental income before calculating their taxable profit. Under Section 24, you can no longer deduct mortgage interest at all. Instead, you receive a 20% tax credit on your mortgage interest costs, regardless of your marginal tax rate.
This has a major impact on higher-rate (40%) and additional-rate (45%) taxpayers. Under the old rules, a higher-rate taxpayer would effectively get 40% relief on their mortgage costs. Now they only get 20%. The result is that your taxable profit is higher than your actual cash profit · in some cases you may pay tax even when the property is running at a cash-flow loss.
Basic-rate (20%) taxpayers are broadly unaffected by Section 24 in isolation, because the 20% tax credit equals the relief they would have received under the old rules. However, the inflated taxable profit can still push some basic-rate taxpayers into higher-rate territory, or reduce their entitlement to personal allowance, child benefit or tax-free childcare.
Use our Rental Income Tax Calculator to model the Section 24 impact on your specific tax position. The worked example below illustrates the numbers clearly.
Although mortgage interest is no longer deductible as an expense (it is replaced by the 20% tax credit), most other genuine costs of letting a property remain allowable deductions from rental income:
Two important things you cannot deduct: capital improvements (adding an extension, replacing a kitchen with something better than what was there) are not allowable revenue expenses · they may qualify for capital gains tax relief when you sell. You also cannot deduct the value of your own time spent managing the property.
When you sell a buy-to-let property, any gain above your annual CGT exempt amount (£3,000 for 2026/27) is subject to Capital Gains Tax. Unlike a property you live in as your main home, you cannot claim Private Residence Relief on a buy-to-let property · the entire gain is potentially taxable.
The CGT rates on residential property gains for 2026/27 are:
You can reduce the gain by deducting the original purchase costs (including stamp duty), the cost of capital improvements during ownership, and selling costs such as estate agent and legal fees. Losses from other capital disposals in the same tax year can also be offset.
Critically, you must report and pay any CGT due on a residential property sale within 30 days of completion using HMRC's UK Property Account. Failure to meet this deadline will result in interest and late payment penalties. This is a common pitfall · make sure your accountant or conveyancer knows the deadline before you complete.
See our Capital Gains Tax Calculator and our detailed CGT guide for more information.
One widely discussed strategy for navigating Section 24 is to hold buy-to-let properties inside a limited company (often called a Special Purpose Vehicle or SPV). The key advantages are:
The disadvantages are significant and often underestimated:
The limited company route is most tax-efficient for landlords who are higher-rate taxpayers, plan to retain profits in the company rather than draw them immediately, and are starting from scratch rather than transferring existing properties. Professional tax advice is essential before choosing this route.
Two variants of buy-to-let that can offer higher yields are Houses in Multiple Occupation (HMOs) and short-term or holiday lets.
HMOs are properties let to three or more unrelated tenants who share facilities such as a kitchen or bathroom. The rental income from letting individual rooms is often substantially higher than letting to a single household, which is why HMO gross yields of 8–12% are achievable in many areas. However, HMOs come with significantly greater obligations:
Short-term lets (including Airbnb and similar platforms) can generate higher nightly income than long-term tenancies in popular tourist areas or cities. However, since October 2023, short-term lets in England require planning permission in some areas, and councils are increasingly introducing local licensing schemes. Mortgage lenders may also prohibit short-term letting under standard BTL mortgage terms, so check your product carefully.
This example shows how Section 24 affects a higher-rate taxpayer compared to the old system, using a straightforward rental property scenario.
| Old Rules (pre-2017) | ||
| Annual Rental Income | £12,000 | |
| Less: Mortgage Interest | −£6,000 | |
| Less: Other Allowable Costs (est.) | −£2,000 | |
| Taxable Profit | £4,000 | |
| Income Tax at 40% | £1,600 | |
| Net Tax Bill | £1,600 | |
| Section 24 (2026/27 rules) | ||
| Annual Rental Income | £12,000 | |
| Less: Other Allowable Costs (est.) | −£2,000 | |
| Taxable Profit (mortgage interest NOT deducted) | £10,000 | |
| Income Tax at 40% | £4,000 | |
| Less: 20% Tax Credit on Mortgage Interest (£6,000 × 20%) | −£1,200 | |
| Net Tax Bill | £2,800 | |
The Section 24 rules result in a tax bill of £2,800 compared to £1,600 under the old system · an increase of £1,200 on exactly the same property generating exactly the same rent. Use the Rental Income Tax Calculator to run this analysis for your own figures.
Enter your rental income, mortgage interest and tax band to see your exact tax position under 2026/27 rules.
Open Rental Income Tax Calculator →Before committing to a buy-to-let purchase, run through these checks to stress-test the investment:
Use our Buy-to-Let Calculator to model yield, cash flow and return on investment before you commit. Our Mortgage Calculator can help you understand monthly payment costs at different rates.
Yes, in almost all cases. If you have a residential mortgage on a property and want to let it out, you generally need your lender's permission or to switch to a buy-to-let mortgage. Standard residential mortgages prohibit letting the property without consent, and breaching this condition can mean the lender calls in the loan. BTL mortgages are assessed on the expected rental income (typically requiring rent to cover 125–145% of interest at a stressed rate) rather than solely on your personal income. They also require a minimum deposit · usually 20–25% of the property value.
No · not without consequences. BTL mortgages specifically prohibit the borrower from living in the property. If you want to move in, you would need to switch to a residential mortgage, which may involve a new application and different rates. There are also tax implications: once you move in, the property becomes your main residence. Any period of owner-occupation after letting may reduce the CGT liability on eventual sale through periods of Private Residence Relief. However, the original purchase is still subject to the additional dwellings stamp duty surcharge unless it replaces your main residence.
A House in Multiple Occupation (HMO) is a property let to three or more tenants from two or more separate households who share common facilities such as a bathroom or kitchen. For HMOs with five or more occupants in two or more households, a mandatory licence from the local council is required under the Housing Act 2004. Many councils also operate additional or selective licensing schemes that extend the requirement to smaller HMOs or all privately rented properties in specific areas. You should check with your local authority before purchasing a property intended for multi-occupancy letting, as operating an unlicensed HMO can result in significant fines and a rent repayment order covering up to 12 months of rent.
For informational purposes only · Not financial or tax advice · Tax rates and rules shown are for 2026/27 · Always take professional advice before making property investment decisions