Tax Basics Every NI Landlord Should Know

Tax is one of the areas that most property investors in Northern Ireland get wrong — either by overpaying because they don’t know what they can claim, or by underpaying through misunderstanding the rules. This guide covers the core tax obligations every landlord in Northern Ireland should understand before they start, not after their first tax bill arrives.

Income tax on rental profits

Rental income is taxable in the UK. If you own property personally, rental profits are added to your other income and taxed at your marginal rate — 20%, 40% or 45% depending on your total income. Rental profit is calculated as rental income minus allowable expenses.

Key allowable expenses for personal landlords include:

Letting agent fees and management charges
Maintenance and repairs (not improvements)
Buildings and contents insurance
Accountancy fees
Ground rent and service charges
Utility bills if you pay them as landlord

Note: mortgage interest relief for personal landlords is now restricted to a 20% tax credit — a significant change from the old full deduction. This is one reason many higher-rate taxpayers consider a limited company structure instead. See: The truth about limited companies for property investors.

Stamp Duty Land Tax (SDLT) on additional properties

If you already own a home and buy an additional residential property, you pay a 3% Stamp Duty surcharge on top of standard rates in England. Northern Ireland uses the same SDLT rules as England. This applies whether you buy personally or through a company, and whether the property is in Northern Ireland or elsewhere in the UK.

For a £120,000 property, the additional dwelling surcharge alone adds £3,600 to your upfront costs — a figure that must be factored into your initial ROI calculation. See: The hidden costs investors forget to budget for.

Capital Gains Tax when you sell

When you sell an investment property that isn’t your primary residence, you pay Capital Gains Tax on the profit. Current rates for residential property are 18% (basic rate taxpayer) or 24% (higher rate taxpayer) on gains above your annual CGT allowance (£3,000 in 2024/25).

Key points:

The gain is calculated as sale price minus purchase price minus qualifying costs (legal fees, refurbishment costs that added value, SDLT)
You must report and pay CGT within 60 days of completion
Losses on other property disposals can be offset against gains

Wear and tear — what you can and can’t claim

The old 10% wear and tear allowance for furnished lettings was abolished in 2016. Personal landlords can now only claim for the actual cost of replacing furnishings like-for-like — not improvements. You cannot claim for the initial furnishing of a property.

Corporation tax if you use a limited company

Limited companies pay corporation tax on rental profits — currently 19% for profits up to £50,000, rising to 25% for profits above £250,000. Companies can still deduct mortgage interest in full, which is the primary tax advantage over personal ownership for higher-rate taxpayers.

Getting proper tax advice

This guide covers the fundamentals. Tax law is complex and changes regularly — and the right structure for one investor may be wrong for another. Work with a property-specialist accountant before making structural decisions. NI Property Girl can refer you to trusted advisors who work specifically with Northern Ireland landlords and property investors.

Frequently asked questions

Do landlords in Northern Ireland pay the same taxes as England?

Yes. Northern Ireland uses the same Stamp Duty Land Tax, income tax and Capital Gains Tax rules as England. Land and Buildings Transaction Tax (Scotland) and Land Transaction Tax (Wales) are devolved but SDLT still applies in Northern Ireland.

Can landlords in Northern Ireland still offset mortgage interest against tax?

Personal landlords can only claim a 20% tax credit on mortgage interest — not full deduction. Limited companies can still deduct mortgage interest as a business expense in full. This difference is the main driver of the limited company structure for higher-rate taxpaying landlords.

How soon do I need to pay Capital Gains Tax after selling a rental property?

You must report and pay Capital Gains Tax within 60 days of completing the sale of a UK residential property. This is done through HMRC’s online CGT reporting service, separate from your Self Assessment return.