Being a landlord in London has become significantly more complicated over the past decade. Successive changes to mortgage interest relief, the introduction of the Section 24 restriction, and an ever-tighter set of rules around capital gains and incorporation mean that property income is no longer something you can manage with a simple spreadsheet. A tax accountant who specialises in property gives landlords the clarity and strategic planning needed to keep more of their rental income and avoid costly mistakes that can take years, and considerable expense, to unwind.
Understanding the Section 24 Mortgage Interest Restriction
Since the phased withdrawal of full mortgage interest relief, landlords who own property personally rather than through a company can no longer deduct mortgage interest directly from rental income. Instead, relief is given as a basic rate tax credit, which pushes many landlords into a higher effective tax bracket than they expect, sometimes without realising it until their tax bill arrives. A good accountant models the real impact of this on your specific portfolio and advises on strategies to manage the extra liability, whether that means adjusting rents, restructuring finance, or reviewing ownership between spouses to make better use of both parties' allowances.
Many landlords are also surprised to learn that this restriction applies to the gross rental income used to determine whether they have crossed into a higher tax band, even though the actual cash benefit of the interest relief is much smaller. This quirk can push a landlord who feels comfortably within the basic rate band into higher rate territory on paper, affecting other allowances and benefits that are tied to overall income, from the personal allowance taper to child benefit thresholds.
Advising on Incorporation and Ownership Structure
For landlords with larger portfolios, incorporating property into a limited company can offer meaningful tax advantages, including full relief on mortgage interest and lower corporation tax rates on rental profits retained in the business. However, incorporation is not right for everyone, and the process itself can trigger stamp duty land tax and capital gains tax charges if not planned carefully, potentially outweighing any long-term saving. A specialist accountant runs the numbers on your specific situation before recommending a path, rather than applying a one-size-fits-all answer that ignores your personal circumstances and future plans.
Ongoing running costs also differ once a portfolio sits inside a company, from separate corporation tax filings to the additional accountancy fees involved in maintaining a limited company structure alongside your personal tax affairs. A thorough cost-benefit analysis weighs these ongoing costs against the tax saving on offer, so that a decision to incorporate is based on the full picture rather than the headline tax rate alone.
Calculating Capital Gains Tax on Property Sales
Selling a rental property triggers a capital gains tax calculation that must now be reported and paid to HMRC within 60 days of completion, a tight deadline that catches many landlords out. An accountant familiar with property ensures the calculation correctly accounts for allowable costs, any periods of private residence, and available reliefs, and handles the reporting deadline so you avoid the penalties that come with late filing, which can accumulate quickly if the sale is not flagged to your accountant promptly after exchange.
Landlords selling a property that was once their main residence, or that has had a mix of personal and rental use over the years, face an especially fiddly calculation involving private residence relief and letting relief in its current, much-restricted form. An accountant who understands the history of the property, not just its most recent use, is essential to getting this calculation right and avoiding an unnecessary overpayment of tax on the sale.
Maximising Allowable Expenses and Reliefs
Landlords are entitled to deduct a wide range of legitimate expenses from rental income, from letting agent fees and insurance to repairs and certain travel costs. The distinction between a deductible repair and a capital improvement, which must instead be offset against a future capital gain, is a common source of confusion. A knowledgeable accountant reviews your expenses each year to ensure you are claiming everything permitted while keeping your records defensible in the event of an HMRC enquiry, which is far more likely for landlords than many people assume given how visible property transactions have become to HMRC.
Navigating Furnished Holiday Lettings and Special Categories
Landlords with furnished holiday lettings, houses in multiple occupation, or commercial property face additional rules that differ significantly from standard residential lettings. Furnished holiday lets, for example, have historically benefited from more generous tax treatment in certain respects but come with strict occupancy conditions that must be met and documented carefully. An accountant experienced across these categories ensures you are applying the correct rules to each type of property in your portfolio, and stays alert to legislative changes that may affect how these categories are taxed in future.
Commercial landlords also need to weigh up the VAT option to tax on their property, a decision that can significantly affect both the cash flow of a purchase and the flexibility of a future sale. Once opted, VAT must generally be charged on rent and eventual sale proceeds, which can affect the pool of potential tenants or buyers, so this is a decision best made with full advice rather than as an administrative afterthought when the paperwork happens to ask the question.
Planning for Inheritance Tax and Succession
Property portfolios often represent a significant part of a family's wealth, which brings inheritance tax planning into focus for many landlords. Whether through careful use of trusts, gifting strategies, or restructuring ownership between family members, early planning can significantly reduce the eventual inheritance tax burden on your estate. A specialist accountant works alongside your solicitor to ensure property succession is planned well ahead of time, not left as an afterthought that only surfaces when it is far too late to act sensibly.
This is often one of the most emotionally sensitive areas of financial planning, since it involves difficult conversations about what happens to a family property business after the current owners are no longer around to run it. Bringing an accountant into these discussions early, alongside a solicitor experienced in estate planning, generally leads to a smoother outcome than leaving the family to work through the tax implications alone at what is already a difficult time.
Keeping Portfolio Records Ready for Making Tax Digital
With Making Tax Digital for Income Tax extending to landlords with significant rental income, digital record-keeping is no longer optional. Landlords need systems that track income and expenses property by property and submit quarterly updates to HMRC. Reliable bookkeeping and accounting services ensure your records are compliant well before the deadlines arrive, avoiding a last-minute scramble that otherwise catches many landlords unprepared each time new digital reporting rules come into effect.
- Portfolio-wide modelling of the Section 24 restriction and its real impact
- Clear guidance on whether incorporation genuinely suits your situation
- Support with 60-day capital gains reporting whenever a property is sold
The Bottom Line
Property investment can still be a rewarding part of a diversified financial strategy, but only when the tax planning behind it is handled with genuine expertise. From Section 24 to capital gains reporting deadlines and inheritance tax planning, landlords have more to think about than ever before. A specialist tax accountant brings order and foresight to a portfolio, and our bookkeeping and accounting services are built to support London landlords through every stage of ownership, from a first buy-to-let to a substantial multi-property portfolio.
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