A portfolio-level summary will happily tell you the whole thing makes money. It will not tell you that one flat has eaten its annual profit in a single boiler replacement and a three-month void, while two others quietly carry it. The only way to see that is a per-property profit and loss statement, and the only way to keep one that is also useful at tax time is to build it on records that already satisfy Making Tax Digital.
This guide sets out exactly what goes into a per-property P&L, where landlords routinely get it wrong, the handful of metrics that actually drive decisions, and how the live tax rules (fully in-force Section 24, MTD for Income Tax, and the enacted 2027 property-income rates) shape what you record and why.
Why track profitability per property, not per portfolio
Take three buy-to-lets producing GBP36,000 of combined rent. At portfolio level that can read as a comfortable surplus. Split it out and the picture often changes: one property runs a long void and an expensive repair year and loses money outright, while the other two subsidise it. You keep buying the same kind of property because the headline looks fine, when the data is telling you to fix or sell the laggard.
Per-property tracking is what turns that guesswork into decisions. Done properly it lets you:
- spot the asset that consistently underperforms and decide whether to refurbish, refinance or sell it
- compare houses against flats, and one area against another, on a like-for-like net yield
- support a remortgage with clean, property-specific numbers a lender will trust
- keep records that feed your quarterly MTD for ITSA updates without a year-end scramble
- build the capital cost history you will need for capital gains tax when a property is sold
What goes into a per-property P&L statement
A useful P&L mirrors how the property actually earns and spends. The structure below works for a single flat or a property inside a larger portfolio account, as long as each address has its own ledger.
Income
Start with the rent due for the period, then bring it down to what the property really earned:
- Gross rent: total rent due for the period
- Less voids: rent lost while the property sat empty
- Less bad debt: rent you realistically will not collect
- Other income: parking, an outbuilding, EV charging, anything beyond the lease rent
- Net rental income: the property's true top line
Revenue expenses
These are the allowable running costs that reduce taxable rental profit. Group them consistently so you can compare cost ratios across properties:
- Letting and management: agent fees, referencing, advertising and re-let costs
- Repairs and maintenance: reactive fixes and like-for-like replacements (not improvements)
- Insurance and services: buildings and landlord insurance, plus any utilities or council tax you cover during voids
- Compliance: gas safety certificates, EICR, EPC, and HMO or selective licence fees
- Professional costs: bookkeeping and the cost of preparing the property accounts
Finance
Record the interest element of the mortgage, never the capital repayment. The full monthly payment matters for cash flow, but only interest belongs in the P&L:
- Mortgage interest: the interest portion of each payment
- Arrangement and broker fees: spread over the relevant deal period rather than dumped in one month
- Other finance: bridging or development interest where it applies
For a more detailed walk-through of what does and does not reduce rental profit, see the landlord tax deductions list.
Capital versus revenue: the split that protects your CGT later
The single most consequential entry decision is whether a cost is revenue (deductible against rent now) or capital (not deductible now, but added to base cost for CGT on sale). Get this wrong and you either overstate your taxable profit today or lose relief when you sell. The line is essentially repair versus improvement.
| Cost | Treatment | Where it lands |
|---|---|---|
| Replacing a broken boiler with an equivalent model | Revenue | P&L, reduces this year's rental profit |
| Repainting and re-carpeting between tenancies | Revenue | P&L, reduces this year's rental profit |
| Fitting a new kitchen of materially better quality | Part revenue, part capital | Like-for-like element to P&L, the upgrade element to capital |
| Adding an extension or converting a loft | Capital | Capital ledger, adds to CGT base cost |
| Cost of making a derelict property habitable to first let | Capital | Capital ledger, adds to CGT base cost |
Keep a dated capital ledger per property. When you eventually dispose of it, those entries lift the base cost and shrink the gain. With residential gains taxed at 18% and 24% above the GBP3,000 annual exempt amount, a tidy capital history is worth real money on disposal.
How to build the P&L, step by step
The method below is deliberately mechanical so it stays consistent month after month and produces records that double as your MTD evidence.
1. One ledger per property
Give every property its own income and expense stream. A dedicated bank account per property is cleanest, but clearly tagged transactions in a shared account work too. The point is that rent, costs and finance for one address never blur into another.
2. Record gross rent, then adjust
Log the rent due, then subtract voids and genuine bad debt. This gives you the property's real earned income rather than its theoretical rent roll.
3. Categorise revenue expenses
Drop each running cost into a fixed category. Consistent categories are what let you compare a maintenance ratio across five properties and see which one is bleeding.
4. Take interest only into the P&L
Split the mortgage payment and carry only the interest into profit. Capital repayment goes to cash flow.
5. Park capital spend separately
Send improvements and let-ready costs to the capital ledger, not the P&L.
6. Calculate the numbers that matter
Net profit, net yield and a total expense ratio per property (covered below).
7. Reconcile and review quarterly
Keep the underlying records digital and reconciled so the same data feeds your MTD updates, then review every quarter.
The metrics worth tracking
Raw profit is a starting point, not an answer. Three measures carry most of the decision-making weight.
Net rental yield
Annual net profit as a percentage of property value: (Annual net profit / property value) × 100. A property worth GBP200,000 netting GBP8,000 a year yields 4%. Net yield is the fairest way to rank assets because it ignores how much rent each happens to charge and focuses on the return.
Cash-on-cash return
Annual cash flow against the cash you actually put in: (Annual cash flow / cash invested) × 100. This reflects leverage, so a modest-yield property bought with a small deposit can still produce a strong cash-on-cash figure.
Expense ratios
Track costs as a share of gross rent to catch creep early:
- Maintenance ratio: maintenance / gross rent
- Management ratio: management / gross rent
- Total expense ratio: all expenses / gross rent
A total expense ratio drifting upward year on year usually means a property is heading for a refurbishment decision, or that an agent's charges are no longer justified.
Choosing a tracking system
The right tool depends on portfolio size and whether you hold personally or through a company. Match the method to the job rather than over-engineering a two-property setup.
| Approach | Best for | Strengths | Watch-outs |
|---|---|---|---|
| Spreadsheet, one tab per property | Up to roughly 5 to 10 properties | Flexible, free, full control of layout | Manual entry, no bank feed, you must check MTD compatibility separately |
| Landlord and property accounting software | Growing personal portfolios | Bank feeds, per-property reporting, MTD for ITSA filing | Subscription commitment, some manual category tidying |
| General cloud accounting (for example Xero) with property tracking | Company-held portfolios | Handles corporation tax and statutory accounts alongside the P&L | Needs property-aware setup to report cleanly per address |
Whichever you pick, the records must be digital and capable of producing quarterly figures, because MTD for ITSA does not accept a once-a-year spreadsheet rebuild. For company portfolios, the same ledgers also support corporation tax and any director loan account tracking you need to keep accurate.
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Section 24, and why your P&L shows more than your tax return
Section 24 is fully in force. For individual landlords, mortgage interest is no longer a deduction from rental profit at all. Instead it produces a tax reducer worth 20% of the interest. The practical effect is that your taxable rental profit is calculated as if you had no finance costs, and a basic-rate credit is then applied.
This is why a commercial P&L and a tax computation diverge, and why you keep both. Consider a higher-rate landlord with GBP18,000 of net rent before interest and GBP6,000 of mortgage interest:
| Line | Commercial P&L | Section 24 tax view |
|---|---|---|
| Net rent before interest | GBP18,000 | GBP18,000 |
| Mortgage interest | (GBP6,000) | Not deducted |
| Taxable profit | GBP12,000 (commercial) | GBP18,000 |
| Tax before reducer (40%) | n/a | GBP7,200 |
| Section 24 reducer (20% × GBP6,000) | n/a | (GBP1,200) |
| Tax payable | n/a | GBP6,000 |
The commercial profit (GBP12,000) is what you manage the property on. The tax bill is driven by the GBP18,000 figure with a flat GBP1,200 credit. Recording the actual interest in your P&L is what makes the reducer calculable, so never strip it out. The full mechanics are in the Section 24 guide, and the broader picture of how rental income is taxed is in how much tax you pay on rental income.
The 2027 property-income rates are already enacted
Finance Act 2026 has legislated separate income tax rates for property income from 6 April 2027: 22%, 42% and 47%. These apply across England, Wales and Northern Ireland (only Scotland is carved out for 2027/28, because Scottish non-savings non-dividend income already follows the Scottish rates). The Section 24 reducer rises to 22% in step with the new basic rate, so no new wedge opens at basic rate. This is enacted law, not a proposal, which is why your records should already separate property income cleanly. A per-property P&L that isolates rental income from any other earnings is exactly the structure these rates assume.
Keeping records MTD-ready
Making Tax Digital for Income Tax is live, on a staged threshold based on qualifying income, which is gross income before expenses:
| From | Qualifying income threshold | Who is mandated |
|---|---|---|
| 6 April 2026 | Above GBP50,000 | Largest landlords and sole traders |
| 6 April 2027 | Above GBP30,000 | Mid-sized portfolios |
| 6 April 2028 | Above GBP20,000 | Smaller portfolios |
Because the test is on gross income, a landlord with GBP52,000 of rent and GBP40,000 of allowable costs (so GBP12,000 of profit) is in scope from April 2026, despite a modest profit. The implication for tracking is simple: digital, reconciled, per-property records produce the quarterly updates as a by-product. If you are already keeping a clean P&L per property, MTD adds a submission step, not a new bookkeeping burden. For the deadlines and submission mechanics, see the MTD for landlords deadline guide.
The mistakes that make a P&L useless
Mixing capital and revenue
The most common and most expensive error. Lumping an extension in with repairs overstates this year's deduction and loses the cost from your CGT base. Keep the two ledgers strictly apart.
Hiding void costs at portfolio level
Void utilities, council tax and re-marketing belong against the property that sat empty, not smeared across the portfolio. Charge them where they happened so the laggard shows its true cost.
Not allocating shared costs
Portfolio insurance, finance arranged across several properties and shared professional fees need a consistent split (by value, rent or floor area). An unallocated shared cost leaves every per-property figure subtly wrong.
Reviewing once a year
Annual-only reporting finds problems far too late to fix the year they happened. Quarterly review is now both good practice and, for many landlords, an MTD reality.
Turning the numbers into decisions
A P&L earns its keep when it changes what you do. The patterns to act on are usually clear once the data is per-property:
- Persistent losses or falling yield: a candidate for sale, especially if the proceeds can be redeployed into a stronger asset. Model the CGT first.
- Strong, stable cash flow: the evidence a lender wants for a remortgage at a better rate.
- A clear top performer: the template for your next acquisition, since similar properties in similar areas tend to repeat the result.
- A creeping maintenance ratio: the signal to plan a refurbishment rather than keep funding reactive repairs.
If the data points toward growth, the structure question follows quickly. Many landlords reach a point where holding through a company changes the maths, which is the subject of scaling a buy-to-let portfolio and when to incorporate. A reliable per-property P&L is what makes those conversations evidence-based rather than instinct-led.
When to bring in professional support
Beyond a certain scale, the time and risk of self-managing the numbers outweigh the convenience. It is usually worth involving a specialist once you are running more than roughly ten properties, operating through a limited company with corporation tax obligations, dealing with HMOs or mixed-use assets, or preparing for incorporation or a significant disposal. A property accountant can set the ledger structure up correctly from the start, keep the capital and revenue split clean, and make sure the same records serve both your decisions and your filings. If you are weighing it up, what a property accountant does sets out where the value sits.
The discipline is the point. A per-property P&L, kept digitally and reviewed quarterly, turns a portfolio from a single fuzzy number into a set of clear, comparable assets you can actually manage, finance and, when the time comes, sell on your terms.