Somewhere in 2017, the relationship between property investment and accounting changed. Not visibly at first, accounts still got filed; the tax returns still went in; the numbers still appeared to work. But Section 24 passed, and the comfortable assumption that a general accountant with a few property clients was adequate for a serious investment portfolio quietly stopped being true.
The years since have sharpened that reality considerably. A property investor managing a portfolio of any meaningful size in the UK today is navigating Section 24’s interest relief restrictions, the 3% SDLT surcharge, CGT at 24% on residential disposals with a 60-day payment window that sits entirely outside the self-assessment calendar, the abolition of the Furnished Holiday Lettings regime, Making Tax Digital for Income Tax arriving from April 2026, and an inheritance tax exposure on investment property that most people haven’t fully modelled.
Any one of those is manageable with decent advice. All of them at once interacting with each other across a mixed portfolio, with a lender who wants more granular financial information than they did three years ago. This brings in a conversation that specialist accountants for rental property are having with their clients right now. And the quality of that conversation is making a measurable difference to how portfolios perform.
What Actually Changed: And Why It Matters Now More Than Ever
It’s worth being clear about what the Section 24 transition actually did, because it’s still not fully understood by every landlord it affected.
Before 2017, mortgage interest was an expense. It was deducted from rental income before calculating tax liability. A higher-rate taxpayer with £20,000 of rental income and £12,000 of mortgage interest paid tax on £8,000 of profit. That’s how it worked.
From 2021 onwards, that same landlord pays tax on £20,000 of income, then receives a 20% tax credit on the £12,000 interest. At the 40% rate, they pay £8,000 in tax and receive a £2,400 credit. Net tax: £5,600. On £8,000 of economic profit. That’s a 70% effective tax rate on the actual profit. And at the 45% rate, or where the interest relief pushes income into a higher band, it gets worse.
Section 24: Before and After
| Scenario | Before Section 24 (Pre-2017) | After Section 24 (Current Rules) |
|---|---|---|
| Rental Income | £20,000 | £20,000 |
| Mortgage Interest Deduction | (£12,000 fully deductible) | Not deductible |
| Taxable Income | £8,000 | £20,000 |
| Tax Rate (Higher Rate) | 40% | 40% |
| Tax Payable | £3,200 | £8,000 |
| Interest Relief | N/A | (£2,400 tax credit @20%) |
| Net Tax Payable | £3,200 | £5,600 |
| Effective Tax on Real Profit (£8,000) | 40% | 70% |
There is no elegant workaround for this. The main structural response has been incorporation, i.e. holding property through a limited company, where mortgage interest remains fully deductible, and Corporation Tax applies at 19% or 25% rather than 40% or 45%. But incorporation isn’t universally beneficial. The SDLT cost on transfer from personal to company ownership can be substantial. Lenders have historically charged higher rates to companies, though the gap has narrowed. And the profit that accumulates still needs to get out somehow, with dividend tax adding another layer when it does.
The point isn’t that there’s a right answer. There isn’t one that applies to every investor. The point is that getting to the right answer for a specific portfolio; with a specific mix of encumbered and unencumbered properties, a specific income level, a specific set of plans for the next decade, requires modelling. Real modelling, with real numbers, not a conversation that ends in ‘you should probably incorporate.’
That’s one part of what specialist accountants for rental property actually do. The rest of this piece covers the others.
Disposals: The 60-Day Clock That’s Catching People Out
CGT on residential property disposals has two components that create independent problems. One is the rate. The other is the timing.
The rate has moved. Since the Autumn 2024 Budget, residential property gains not covered by Private Residence Relief are taxed at 18% for basic rate taxpayers and 24% for higher and additional rate taxpayers. The 24% rate isn’t dramatically higher than the old 28%, but the reduction in the CGT annual exemption from £12,300 in 2022/23 to £3,000 from April 2024 means more of each gain is taxable now than it was two years ago.
The timing problem is more disruptive than the rate change. Since April 2020, UK residents disposing of UK residential property are required to report the disposal and pay the CGT due within sixty days of completion. That is sixty calendar days, not days from the end of the tax year, or from the self-assessment filing deadline.
An investor who sells rental property in November, intending to deal with the tax in their January self-assessment return, has already missed the window by a month. The penalties start at £100 and increase with delay. Interest runs from the 60-day deadline. This obligation catches people out routinely, including people with accountants who didn’t flag it before completion.
“AcoBloom Top Tip: The 60-day CGT reporting window on residential property disposals sits entirely outside the self-assessment calendar. An accountant who hears about a sale after it completes cannot prevent the penalty — only manage the damage.“
The planning window for a disposal is before exchange of contracts, not after completion. At that point, there are still decisions to be made. Namely, whether to complete it before or after 5 April, how the gain interacts with other income in the tax year, whether any losses elsewhere in the portfolio can be crystallised to reduce the net gain, what the Private Residence Relief position is if the property was ever a main home. Once it’s done, the options narrow considerably.
For executives managing portfolios with multiple assets, the disposal sequence across a series of tax years is itself a planning exercise. Which properties carry the largest embedded gains? Which have losses that could be used? Where is the investor’s income likely to sit relative to the higher rate threshold each year? These questions require accounting for investment properties that is proactive and forward-looking, not reactive.
Structure as a Financial Decision, Not an Administrative One
Property investors tend to think of their holding structure as an administrative matter; something decided once, at the start, and periodically revisited when something big changes. In practice, the structure question is asked constantly, because the environment it’s responding to keeps evolving.
The limited company route has become the default for new residential investment purchases. According to UK Finance, limited companies now account for well over half of all new buy-to-let mortgage completions. That shift happened because Section 24 made personal ownership economically less attractive for higher-rate taxpayers. But a default isn’t always the right answer for a specific investor, and the growth of limited company buy-to-let has created a cohort of investors who incorporated because everyone was incorporating rather than because a proper analysis supported it.
Family investment companies sit at the more sophisticated end of the spectrum. An FIC accumulates income at Corporation Tax rates, distributes it through dividend when it’s tax-efficient to do so, and can be structured to facilitate wealth transfer to the next generation without triggering an immediate IHT event. The governance requirements are higher than for a straightforward property company. But for investors managing portfolios of meaningful size with long time horizons, the FIC is one of the few structures that genuinely addresses both the income tax and the succession dimension simultaneously.
Property Holding Structures Comparison
| Criteria | Personal Ownership | Limited Company (SPV) | Mixed Structure |
|---|---|---|---|
| Mortgage Interest Relief | Restricted (Section 24) | Fully deductible | Optimised across assets |
| Tax Rates | 20%–45% Income Tax | 19%–25% Corporation Tax | Blended efficiency |
| CGT on Disposal | 18% / 24% | Corporation Tax + dividend tax | Flexible planning |
| SDLT on Acquisition | Standard + 3% surcharge | Same (plus incorporation cost if transferring) | Case-dependent |
| Profit Extraction | Direct access | Dividend tax applies | Structured withdrawals |
| Complexity | Low | Moderate | High (requires modelling) |
| Suitability | Small portfolios, lower-rate taxpayers | Growing portfolios, higher-rate taxpayers | Larger, strategic portfolios |
One thing that doesn’t get discussed enough is the structure question for a portfolio isn’t binary. A mixed structure i.e. some properties held personally, some in a company, some approaching disposal and therefore better held outside the company to access the annual CGT exemption, may be more tax-efficient overall than a pure strategy in either direction. The optimal arrangement depends on the specific assets, the specific financing, and the specific investor’s income and succession plans. Working that out requires more than a template answer.
Making Tax Digital: The Compliance Shift That’s Closer Than People Think
Making Tax Digital for Income Tax Self Assessment is not a distant regulatory change. It’s arriving in April 2026 for landlords with total income from property and self-employment above £50,000, in April 2027 for those above £30,000, and in April 2028 for those above £20,000.
What changes is not just the format. The mechanics of compliance change entirely. Quarterly digital submissions of income and expenditure data replace the current single annual return. The records need to be current, digital, and held in HMRC-approved software. For an investor with five properties who currently gathers twelve months of bank statements and receipts every January and hands them to their accountant, that process stops working.
Property needs to be tracked individually. If three properties are in a portfolio, the income and expenditure for each needs to be recorded separately through the year, not reconstructed from aggregate bank data at quarter-end. The bookkeeping infrastructure that works for one or two properties held personally does not scale gracefully to a portfolio of ten without either significantly more time from the investor or a properly designed accounting system.
The investor who is best placed here isn’t the largest or the most sophisticated. It’s the one who addressed this early. The accounting for investment properties that is currently tracking income and expenditure by property, in real time, through a cloud-based platform like Xero or QuickBooks, will transition to MTD with a reporting format change. The investor still working from a spreadsheet, and a folder of invoices will need to rebuild their entire record-keeping process under deadline pressure.
What Lenders Actually Need: And Where the Information Gap Shows
The buy-to-let lending market has tightened, and not only because rates are higher. The underwriting process for portfolio landlords has become more rigorous at the information level, and investors who haven’t structured their financial reporting to provide what lenders want are finding applications harder to navigate than they expected.
Portfolio landlords, such is the case with investors with four or more mortgaged properties, are subject to a full portfolio assessment on every new mortgage application or remortgage. The lender wants a schedule of every property: address, current value, outstanding mortgage, monthly rental income, and the identity of the lender. They want to see that the portfolio as a whole is debt-service compliant at a stressed rate, typically 5.5% or 6%, at 125–145% rental coverage. And they want those numbers to be accurate, current, and presented clearly.
This is where the quality of ongoing accounting for investment properties becomes a direct financial asset. An investor whose accountant maintains a current portfolio schedule, tracks loan-to-value positions and keeps management accounts that demonstrate portfolio-level performance has information ready when a lender asks for it. An investor who has to reconstruct this from scattered records under the time pressure of a mortgage application will either delay the process or present information that doesn’t inspire confidence.
Limited company borrowing adds another dimension. Lenders want company accounts, a director’s personal financial statement, and increasingly a business plan that demonstrates the company is being run as a genuine commercial operation rather than as a holding vehicle. The quality of the company’s accounting; whether the accounts are filed on time, whether the management information is coherent, whether there are inter-company loan issues that complicate the picture, feeds directly into the lender’s assessment.
The Inheritance Tax Problem Nobody Wants to Model
Investment property doesn’t qualify for Business Property Relief. That’s the starting point, and it’s one that investors sometimes assume isn’t true because they’ve heard about BPR in the context of businesses generally.
Unlike shares in a trading company or agricultural land (with its own qualifying conditions), residential investment property sits in the estate at market value and is fully subject to inheritance tax at 40% above the nil rate band. The nil rate band is £325,000. With the residence nil rate band, it can reach £500,000 for a surviving spouse passing to direct descendants. For an investor with a portfolio worth £2 million, the IHT exposure on the residual estate, after other assets, is substantial and frequently uncapped.
The Autumn 2024 Budget reduced some of the flexibility investors had been using around this. AIM shares, which had attracted BPR at 100%, now face a 50% BPR restriction from April 2026. That was a targeted change, but it reinforces a broader trend: the reliefs available to investment wealth are narrowing, not broadening.
Succession planning for property portfolios needs a long lead time and honest financial modelling. Gifting with a seven-year clock. Family investment company structures that allow wealth to transfer in a more controlled way. Life insurance to fund a known liability. Spousal exemption strategies. None of these are quick interventions. An investor who is sixty-five and owns £3 million of investment property has a smaller planning window than one who is fifty and addresses this now.
The accountants for rental property who are doing this work properly are the ones raising it proactively, not waiting to be asked. For clients managing portfolios at scale, the IHT conversation is part of the annual review, not a separate engagement that happens only when the investor mentions it.
Furnished Holiday Lettings: Gone from April 2025, Still Creating Problems
The Furnished Holiday Lettings regime was abolished from 6 April 2025. For investors who structured their short-term letting operations around it, the abolition isn’t just a tax rate change; it’s a fundamental shift in how that income is classified and what reliefs are available against it.
Under FHL rules, qualifying properties were treated as a trade. That meant capital allowances on furnishings and equipment, pension-relevant earnings from the income, and most significantly for investors planning eventual disposal – Business Asset Disposal Relief, which capped the CGT rate at 10%. For a property with a large embedded gain that had been held as an FHL, BADR made the difference between a disposal costing 10% and one costing 24%. That option is now gone.
The income from short-term letting now sits within the property income box alongside long-term residential rents. The deductibility rules are different. The loss treatment is different. And the interaction with the investor’s overall income, given that property income can affect the restriction of the personal allowance above £100,000 adjusted net income, needs fresh analysis.
Investors with mixed portfolios, some traditional tenanted properties, some that operated under FHL need accounting for investment properties that has been updated to reflect the post-April 2025 position. It’s not automatic. It requires someone to look at the portfolio, understand what has changed for each asset, and model the revised position.
What the Relationship with a Specialist Accountant Should Actually Look Like
The test of whether your current advisers are functioning as specialist accountants for rental property or as generalists who happen to file property returns is fairly simple. How often does the conversation happen, and who initiates it?
If the annual contact consists of a request for records in January, followed by a set of accounts and tax returns, the relationship is compliance-only. That isn’t a criticism of the accountant’s technical ability; it’s a description of a service model that doesn’t include proactive advice. For a single property and a straightforward tax position, that might be adequate. For a portfolio of any meaningful scale, it’s not.
Investors who are best placed financially are not the wealthiest, necessarily; but the ones making the best decisions with what they have, tend to share a few characteristics.
- Disposals are discussed before exchange, not after completion. The 60-day clock starts at completion; the planning window closes at exchange. An accountant who is consulted after the fact can file the return. One consulted before can influence the outcome.
- The portfolio structure has been reviewed in the last two years against the current tax environment, not the one that existed when it was set up. Section 24, the CGT changes, the FHL abolition, and the MTD timetable have all shifted the optimal arrangement for most investors.
- The IHT exposure is quantified and has a plan attached to it. Not a vague intention to ‘sort out the trust at some point’ — a specific modelled position with a timeline.
- Lender-ready financial information is current rather than reconstructed. Portfolio schedules, company accounts, and management information exist and are maintained as a matter of course, not assembled when a mortgage application triggers a scramble.
- MTD compliance is operational or being actively prepared. Quarterly digital submissions will be required; the question is whether the infrastructure is in place before the deadline or after it.
None of this requires a large firm or an expensive retainer. It requires an accountant who works in property specifically, who maintains active contact throughout the year, and who sees their role as contributing to decisions rather than recording them.
How AcoBloom Works with UK Property Investors
AcoBloom works with residential landlords, portfolio investors, and the executives of larger property investment businesses across the UK. Our accounting for investment properties is built around the current tax reality i.e. Section 24, CGT at 24%, the 60-day reporting obligation, FHL abolition, MTD, and the IHT exposure that most property portfolios are carrying without a plan to address it.
We maintain property-level income and expenditure records throughout the year, not at year-end. We prepare portfolio schedules that support mortgage applications and lender conversations. We model disposal timing and sequence as part of ongoing tax planning, not as a reactive exercise when a sale is already agreed. And we raise the succession question with clients who haven’t yet addressed it, because the IHT liability in most property portfolios is the largest unmanaged financial risk the investor is carrying.
For investors and executives who have grown their portfolios to a point where they need more than a filing service and need accounting that actually informs decisions rather than describing them after the fact – AcoBloom is a practical starting point.
Final Thoughts
The role of specialist accountants for rental property in the UK has expanded because the environment has demanded it. A decade ago, a property investor needed an accountant to file returns and keep records. That’s still necessary. It’s no longer sufficient.
The structural decisions, i.e. how to hold the portfolio, how to sequence disposals, how to position for a lender, how to plan for IHT, how to prepare for MTD – don’t get resolved in a January meeting where the focus is on filing the accounts. They get resolved in proactive, technically informed conversations that happen throughout the year, initiated by an adviser who understands property well enough to know when those conversations need to happen.
If that describes your current relationship with your accountant, you’re well placed. If it doesn’t, the gap is worth closing before the next policy change makes it more expensive.
