If you own even a single rental property in Blackburn, HMRC treats you as running a property business — and the rules have tightened significantly. Mortgage interest is no longer fully deductible, Making Tax Digital is coming for landlords, and Capital Gains Tax on residential property is due within 60 days of sale. Getting this right isn’t optional; it’s the difference between a rental that quietly builds wealth and one that quietly leaks it.

This guide is for Blackburn landlords — accidental, portfolio and everything in between. It covers how rental income is taxed in 2026, which expenses you can actually claim, how MTD for Income Tax will apply to landlords, and the mistakes that most often cost money.

1. How rental income is taxed in the UK (2026)

Rental income from residential property is taxed as property income on your Self Assessment tax return (SA100 + SA105). It’s added to your other income and taxed at your marginal rate — 20%, 40% or 45%.

Key thresholds to know:

• £1,000 Property Allowance — if your gross rental income is under £1,000, you usually don’t need to declare it.
• £2,500+ in rental income after expenses (or £10,000+ gross) means you must register for Self Assessment.
• Rent-a-Room Scheme: up to £7,500 tax-free if you let a furnished room in your own home.
• Non-resident landlords must operate under the NRL scheme — tax withheld at source unless approved to receive rents gross.

Joint ownership: rental profits are split according to legal ownership by default (50/50 for spouses), but a Form 17 plus a Declaration of Trust can change the split for tax purposes when beneficial ownership differs.

2. Mortgage interest — the rule that changed everything

Since April 2020, individual landlords cannot deduct mortgage interest from rental income as an expense. Instead, you get a 20% tax credit against your Income Tax bill for the mortgage interest paid.

Practical impact for higher-rate landlords: your taxable rental profit is calculated before mortgage interest, which can:

• Push you into the 40% or 45% band even when your real-world cashflow is thin,
• Reduce your Child Benefit (High Income Child Benefit Charge kicks in above £60,000), and
• Restrict your personal allowance if adjusted income exceeds £100,000.

This is why many Blackburn landlords with 3+ properties consider incorporating into a limited company — companies still deduct mortgage interest in full. But incorporation has its own costs (SDLT, CGT, remortgaging) and isn’t right for everyone. Take advice before restructuring.

3. Allowable expenses — what you can (and can’t) claim

Any expense that is wholly and exclusively incurred for the rental business is allowable. In practice for a Blackburn buy-to-let that means:

Allowable:

• Letting agent and management fees
• Landlord insurance and rent guarantee cover
• Council Tax and utility bills (during void periods or if you pay them)
• Ground rent and service charges
• Repairs and maintenance (broken boiler, replacing a rotten window like-for-like)
• Cleaning, gardening and safety certificates (gas safety, EICR, EPC)
• Accountant’s fees for the property accounts
• Advertising the property to let
• Mileage or motor costs for property visits (usually 45p/mile flat rate)
• Mortgage arrangement fees (spread over the term)

Not allowable as an expense (though they may reduce Capital Gains Tax later):

• The property purchase price and legal/survey costs on purchase
• Improvements — a new extension, loft conversion, or upgrading a basic kitchen to a luxury one
• Capital repayments on the mortgage (only interest gets the 20% credit)
• Your own labour

The Replacement of Domestic Items Relief lets you deduct the cost of replacing furniture, appliances, kitchenware and soft furnishings in a fully-let residential property — but only the like-for-like replacement, not the original purchase or an upgrade element.

4. Making Tax Digital for landlords — the 2026 changes

Making Tax Digital for Income Tax Self Assessment (MTD ITSA) applies to landlords in phases, based on gross combined income from self-employment and property:

• From April 2026: gross income over £50,000
• From April 2027: gross income over £30,000
• From April 2028: gross income over £20,000

If you’re in scope, you must:

• Keep digital records of rental income and expenses,
• Use MTD-compatible software (FreeAgent, Hammock, Xero, QuickBooks, or bridging software),
• Submit quarterly updates to HMRC, and
• File a Final Declaration after the tax year end replacing the traditional Self Assessment.

If you have both self-employment and rental income, the £50k/£30k/£20k threshold is the combined gross total — many Blackburn landlords with a small side business will be caught earlier than they expect.

Common landlord tax mistakes we see

• Not registering for Self Assessment when rental income starts.
• Deducting mortgage capital repayments as if they were interest.
• Claiming improvements as repairs (HMRC challenges this often).
• Missing the 60-day CGT deadline when selling a rental property.
• Forgetting to declare deposits kept for damages as income.
• Overlooking joint ownership Form 17 planning for higher/lower-rate couples.
• Assuming a limited company is automatically better — often it isn’t for 1–2 properties.

Final thoughts

Landlord tax is one of the areas where a good Blackburn accountant pays for themselves several times over — through correctly claimed expenses, joint-ownership planning, incorporation advice where it fits, and getting you MTD-ready before HMRC forces the issue. If you own one or more rental properties in or around Blackburn and haven’t reviewed your position in the last 12 months, it’s time to talk to our property and landlord accounting specialists.

Related reading: Small business accountant in Blackburn: a founder’s guide, Does Making Tax Digital apply to sole traders?, and VAT returns in Blackburn.

Frequently Asked Questions

How is rental income taxed in the UK?

Rental profits (rent received minus allowable expenses) are added to your other income and taxed at your marginal rate — 20%, 40% or 45%. Report via Self Assessment. From April 2026, landlords with combined qualifying income over £50,000 fall into Making Tax Digital for Income Tax.

What expenses can landlords claim?

Allowable expenses include letting agent fees, repairs and maintenance (not improvements), landlord insurance, ground rent and service charges, accountancy fees, replacement of domestic items, and finance costs (as a 20% tax credit on residential lets).

Do landlords still get mortgage interest relief?

Since April 2020, mortgage interest is no longer deducted as an expense on residential lets. Instead, you receive a 20% tax reduction (basic-rate credit) on the interest paid — which can push higher-rate landlords into paying tax on losses.

When does Making Tax Digital apply to landlords?

From April 2026, landlords with combined self-employment and property income over £50,000 must keep digital records and file quarterly updates. The threshold drops to £30,000 in April 2027 and £20,000 in April 2028.