Being a residential landlord used to be relatively straightforward. Whether you owned a terrace in Taunton, a country cottage in the Quantocks, or – ok, enough with the alliterations – the formula was simple. You collected the rent, deducted your agent fees, repairs, and mortgage interest, and you paid tax on the net figure.

Over the past decade, however, the tax regime for property owners has undergone a seismic shift. Today, staying compliant while remaining profitable and avoiding nasty surprises requires a clear understanding of how HMRC taxes rental income. Here is a practical guide to where UK residential landlords stand and how to keep your property portfolio running smoothly.

Caveat: Everything in this article talks about residential accommodation. If you’re a landlord of commercial premises, none of this will apply to you…

Understanding Gross Rent and the Property Income Allowance

At its core, rental income is treated as non-savings income and added on top of your other earnings, such as your salary, self-employment income or pension. This means your rental profit is taxed at your marginal rate of Income Tax, whether that is the basic rate (22%), higher rate (42%), or additional rate (47%).

You’ll note this is higher than the normal Income Tax rates – sadly, not a typo; from April 2027, there’s a 2% hike over and above the “normal” rates.

For landlords with modest rental earnings, you’ve got the option of the Property Income Allowance (PIA). This allows you to receive up to £1,000 of gross property income tax-free each year. If your gross rental income (that is, cash received from your tenants) is under £1,000, you do not even need to report it to HMRC. If it exceeds £1,000, you have a choice. You can either deduct the flat £1,000 allowance or deduct your actual allowable expenses.

For most rental properties, income will be well in excess of £1,000 per year. But if you’re just renting out a garage, or perhaps only rented a property for a month or two, this is your get-out-of-jail-free card.

However, if the rent is over £1,000 and you’ve only got modest expenses (e.g. no mortgage, no letting agent fees, etc etc) then you can still use the PIA and knock a flat £1K off your rental profits, instead of (say) £500 of actual costs. If we prepare your return, we’ll always check which is going to be most beneficial – not just “do the same as last year.”

If your expenses exceed £1,000, claiming actual expenses is almost always the smarter move. Allowable expenses include letting agent fees, property insurance, council tax, utility bills, and day-to-day repairs.

It is crucial to distinguish between repairs and capital improvements. Fixing a broken boiler or repainting a hallway is an allowable expense. Adding a conservatory or a loft conversion is a capital improvement. Capital costs cannot be offset against your rental income, although they will help reduce your Capital Gains Tax (CGT) bill when you eventually sell the property. More on that here

Section 24 and Finance Costs

The biggest change in landlord taxation in recent years stems from Section 24 of the Finance Act, introduced in 2015. Historically, landlords could deduct 100 percent of their mortgage interest from their rental income before calculating tax – just like any other expense. But under s.24, mortgage interest is no longer an allowable deduction for individual landlords.

Instead, individual property owners receive a basic-rate tax credit equal to 22% of their interest. While basic-rate taxpayers with low gearing may notice little difference (if they pay tax at 22% and get relief at 22%, no problem), higher-rate taxpayers feel the pinch. Their profits will be taxed at 42% or higher, but yet still only 22% relief on the mortgage.

Because tax is calculated on profit before mortgage costs, your declared income becomes artificially inflated. This can inadvertently push basic-rate taxpayers into higher tax bands or trigger the loss of personal allowances and child benefit or tax-free childcare.

An effective tax rate above 100%…!

It can happen. We’ve got clients who are stung by this. If you’re already a higher-rate taxpayer, and you’ve got a chunky mortgage, then here’s how it might play out:

Salary & other earnings: £50K
Rental profit before mortgage interest: £20K – taxed at 42% = £8,400
Mortgage interest paid: £15K – relief at 22% = £3,300
Actual profit for the year: £5,000
Tax payable: £8,400 less £3,300 = £5,100

Yes, that’s right – the tax is MORE than the profit you made. 🤯

And that’s BEFORE we factor in the potential loss of child benefit, or other income-based benefits.

Holding Property Personally vs Limited Company Structures

With the restrictions on mortgage interest relief, we’re often asked about holding property in a Special Purpose Vehicle (SPV), which is essentially a Limited Company used exclusively for property holdings.

Unlike individual property owners, Limited Companies can still deduct mortgage interest as a full business expense. Even better (unless you’re living off the rental income), profits retained within the company can be reinvested without attracting personal tax until the cash is physically extracted from the company.

However, the government are well aware of this, and the road to incorporating a property portfolio is paved with difficulty. For tax purposes, the transfer is (with few exceptions) no different to you selling the property to a third party. This can trigger significant CGT (for you as the seller) and Stamp Duty (for your company as the buyer), alongside mortgage refinancing fees. Mortgage rates for Limited Companies are often higher than for personal BTLs too.

For new purchases, a company structure often makes sense, but for existing portfolios, a careful cost-benefit analysis is essential. In other words, DO NOT start transferring – or buying – properties without speaking to your accountant AND your lender first.

Digital Record-Keeping and MTD for ITSA

As if the gov’t didn’t already have it in for landlords, you now face another admin hurdle with Making Tax Digital (MTD). Under this initiative, you’ll (probably) need to use accounting software to report your rental figures to HMRC every quarter, on top of the annual tax return.

If your total qualifying gross rents from property (and self-employment, if applicable) exceeds £20,000, you’ll be caught by MTD at some point between now and 2028 – speak to your accountant; they can advise you exactly which tax year you’ll be caught by.

Keeping Your Portfolio Tax-Efficient

Property investment remains a popular way to build long-term wealth, but the tax rules are far less forgiving than they once were. Keeping accurate records, understanding allowable expenses, and choosing the right ownership structure are vital steps in protecting your yield.

As a firm regulated by the Institute of Chartered Accountants in England and Wales (ICAEW), our small but perfectly formed team of penguins in Taunton will make sure you’re as tax-efficient as you can be, whilst also avoiding surprise letters from HMRC.

If you want help either with a potential restructure or ongoing compliance, fill in the application form on the contact page and one of the team will be in touch.