If you’re a UK landlord, staying on top of tax legislation isn’t optional — it’s essential. Every year brings new rules, thresholds, and government measures that can dramatically affect your rental income and long-term property strategy.
In 2025, landlords face a mix of tax changes, ongoing rules, and tightening compliance that could cost thousands if ignored. At NetRent, we work with landlords daily who are navigating these issues. This guide outlines the key tax updates and considerations you need to be aware of this year.
Mortgage Interest Tax Relief: The “New Normal”
Although the full restriction came into force in April 2020, its impact continues to shape landlord profits in 2025.
- Before 2020: Landlords could deduct 100% of mortgage interest from rental income before paying tax.
- Now: You receive only a 20% basic-rate tax credit on mortgage interest.
What this means in practice:
- Basic-rate taxpayers (20%) are unaffected.
- Higher-rate (40%) and additional-rate (45%) taxpayers pay significantly more tax on the same rental income.
Example:
- Mortgage interest = £10,000/year
- Before 2020: £10,000 deducted from rental income.
- Now: Only £2,000 (20%) can be offset as a tax credit.
This is why more landlords are switching to limited company buy-to-let mortgages (see section 5).
Corporation Tax Rates for Limited Companies
If you hold property in a limited company, corporation tax remains a critical factor in 2025.
- The main corporation tax rate is 25% for companies with profits over £250,000.
- For smaller companies (profits under £50,000), the small profits rate is 19%.
- Companies with profits between £50,000 and £250,000 face a tapered rate between 19%–25%.
Why this matters:
- Many portfolio landlords are affected by the higher 25% rate.
- Tax planning (such as managing how profits are drawn out of the company) is essential.
Capital Gains Tax (CGT) Updates
Capital Gains Tax applies when you sell a rental property. In 2025, landlords should note:
- Annual CGT allowance reduced to £3,000 (from £6,000 in 2023/24, and £12,300 previously).
- This means more of your property sale profit is now taxable.
- Residential property CGT rates remain 18% for basic-rate taxpayers and 28% for higher/additional-rate taxpayers.
Example:
- Property sold with £100,000 gain.
- 2023/24: First £6,000 tax-free.
- 2025/26: Only £3,000 tax-free → you pay tax on an extra £3,000 gain.
The cut in allowances makes timing and strategy around disposals even more important.
Making Tax Digital (MTD) for Income Tax
The rollout of Making Tax Digital (MTD) continues to reshape how landlords report their income.
- From April 2026, landlords earning over £50,000 annually must keep digital records and file quarterly updates with HMRC.
- From April 2027, the threshold reduces to £30,000.
Impact on landlords:
- You’ll need to use approved accounting software.
- Quarterly reporting means more admin — and penalties for late or incorrect submissions.
- This will add ongoing compliance costs, but also greater transparency.
2025 is the time to prepare — don’t wait until 2026 to get systems in place.
The Limited Company vs. Personal Ownership Question
One of the biggest ongoing tax decisions landlords face: hold property personally or through a limited company?
- Personal ownership: Simpler, cheaper upfront, often better for landlords with small portfolios who are basic-rate taxpayers.
- Limited company ownership: Allows mortgage interest relief in full, but subject to corporation tax and additional admin.
In 2025, more lenders than ever are offering limited company buy-to-let products, meaning the “tax trade-off” is becoming easier to balance.
Stamp Duty Land Tax (SDLT) Surcharge
The 3% surcharge on additional property purchases remains in place in 2025. This applies whether you buy personally or through a limited company.
- Applies on top of standard residential SDLT rates.
- Example: On a £250,000 property, the SDLT is £10,000 higher for landlords than for first-time buyers.
Tip:
Factor SDLT costs into your investment calculations before expanding your portfolio.
EPC and Green Incentives (Linked to Taxation)
While not a direct tax yet, energy efficiency regulations continue to move towards influencing taxation and lending.
- Properties below EPC “C” may soon be harder to mortgage or remortgage.
- The government has floated tax incentives for energy-efficient improvements, but details are evolving.
Landlords who upgrade early may benefit not only from tax breaks but also from stronger tenant demand and better mortgage deals.
What Landlords Should Do Now
- Review your ownership structure. Is personal or limited company best for you?
- Check your mortgage position. Rates, stress tests, and tax all interact.
- Plan property sales carefully. CGT allowances are smaller — timing matters.
- Prepare for Making Tax Digital. Don’t wait until the deadline.
- Consider remortgaging. The right deal can protect cash flow and offset tax costs.
Final Thoughts
Tax changes may feel like red tape, but the reality is they directly affect your rental profits. Ignoring them could mean paying thousands more than necessary. With allowances cut, reporting rules tightening, and mortgage interest relief restricted, 2025 is the year to take proactive control of your tax and mortgage strategy.
Speak to NetRent Today
At NetRent, we specialise in helping landlords navigate the mortgage and tax landscape. Whether you’re reviewing your ownership structure, planning a remortgage, or expanding your portfolio, we’ll guide you through the best options.
Call us today on 01352 721300