Property Portfolio Profitable but No Cash? Where Your Rental Cash Is Actually Going

If your property portfolio is profitable but no cash ever seems to reach your account, the rent has not gone missing. It has been absorbed before it clears your bank, by mortgage payments, service charges, maintenance, voids, arrears, tax and capital repayments, not by bad bookkeeping or fraud. Profit is an accounting figure. Cash is what actually sits in your account, and for London landlords the gap between the two has widened sharply since Section 24 changed how rental income is taxed.

What Does It Mean for a Property Portfolio to Be Profitable but No Cash?

This is one of the most common things we hear from portfolio landlords across London and Essex, including owners with two or three flats in Ilford and clients running SPV structures across South West London. The year end accounts show a solid surplus. The rent roll looks healthy on paper. Yet the personal account keeps topping up the business every month to cover a mortgage payment, an unexpected service charge demand or the accountant’s bill, and it never quite feels like the numbers add up in real life.

A property portfolio profitable but no cash is not usually a sign that something has gone wrong. It is a sign that profit, as your accounts define it, and cash, as your bank statement defines it, are measuring two different things. Profit is calculated after certain deductions and allowances, on an annual basis, often weeks or months after the money has already moved. Cash moves in real time, every time a mortgage direct debit, a service charge invoice or a repair bill leaves the account, regardless of what the profit and loss account will eventually say about the year.

Where Is a London Landlord’s Rental Cash Actually Going?

Below are the seven places rental income most often disappears before it becomes usable cash. Most landlords recognise two or three of these immediately. Few have ever seen all seven laid out against their own portfolio at once.

1. Mortgage payments. Interest-only borrowing keeps the monthly outgoing lower, but any element of capital repayment, or a remortgage onto a higher rate, increases the cash leaving the account without changing the profit figure in the same way. London buy-to-let rates have stayed well above pre-2022 levels, and a five-year fixed rate coming up for renewal can lift monthly outgoings sharply overnight.
2. Service charges. Flats, SPV-held blocks and anything on a lease carry service charges and ground rent that are billed separately from the mortgage, often twice a year, and can rise steeply after major works are approved by the freeholder or management company.
3. Maintenance and repairs. Boilers, roofs, damp and the general wear a tenanted property takes all cost real money, and Energy Performance Certificate requirements are pushing more landlords toward insulation and heating upgrades that were not budgeted for when the property was bought.
4. Voids. A property earning nothing between tenancies is still costing you the full mortgage payment, insurance and any service charge. London’s average void period is now among the shortest in England at 16.6 days, yet because London rents are highest, the average cost of a void still reached 1,252 pounds in 2026, the highest of any English region.
5. Arrears. A tenant who falls behind on rent still shows up as income on an accruals basis in some reporting, while contributing nothing to the bank account until it is recovered, if it ever is, and chasing it costs time and sometimes legal fees.
6. Tax. Since Section 24 was fully phased in, individual landlords no longer deduct mortgage interest from rental income before working out their taxable profit. Instead, HMRC applies a basic rate tax credit of 20 percent on finance costs after the tax has already been calculated on the full rental income. For a basic rate taxpayer this broadly cancels out, but for anyone pushed into or already in the higher rate band, the tax bill can end up larger than the actual profit left once the mortgage is paid.
7. Capital repayments. If any part of your mortgage is on a repayment basis, the capital element is not an allowable expense for tax purposes at all, yet it still leaves your account every month. This is one of the most common causes of what feels like phantom profit, a healthy figure on the tax return that was never available as spendable cash.

Specialist accounting for property investors and landlords exists precisely because these seven pressures interact differently on every portfolio, and a generalist year end accountant rarely has the time to trace all seven through your specific numbers.

What Is the Difference Between Accounting Profit and Cash Flow for a Landlord?

Your profit and loss account works out taxable profit by taking your rental income and deducting allowable expenses, such as insurance, management fees, repairs and, since Section 24, only a 20 percent tax credit rather than a full deduction for mortgage interest. It does not deduct the capital element of a repayment mortgage at all, because that is treated as reducing a loan rather than as a running cost of the business.

Cash flow ignores all of those accounting rules. It simply tracks what leaves and enters your bank account: the full mortgage payment, interest and capital together, the service charge invoice on the date it is paid, the tax bill on the date HMRC takes it, and the rent on the date, if any, that the tenant actually pays it. This is why a portfolio can report a comfortable annual profit and still leave its owner short of cash most months.

A Simple Example: Where a Month’s Rent Actually Goes

The profit and loss account for this property would likely show a healthier figure than 220 pounds a month, because it excludes the capital repayment element of the mortgage entirely and spreads the tax charge differently across the year. On paper, the portfolio looks profitable. In the account, 220 pounds is what is actually left once every real cost has cleared.

What Are the Warning Signs of a Property Portfolio Cash Flow Problem?

Most landlords notice a symptom in the bank account long before they can name the cause. This table matches a warning sign you may already be seeing to where the cash is most likely stuck.

Why Do Profitable Portfolios Still Run Into a Cash Gap?

Understanding the seven areas above is one thing. Knowing which of them, in what combination, is actually causing the gap in your own portfolio is another. Is it one under-performing property dragging down an otherwise healthy set of flats? Is it the timing of a remortgage landing badly against a run of voids? Has the portfolio simply grown faster than the cash reserves supporting it, so that a strategy that worked with two properties no longer works with six?

These are not questions a set of year end accounts, on their own, are built to answer. They require pulling every mortgage statement, service charge account, tenancy record and tax computation together against a single timeline, property by property, to see exactly where the money stops moving. That is the point at which most landlords realise they need someone to look at the actual numbers behind the portfolio, not just the categories the cash could theoretically be sitting in.

What Should London and Essex Landlords Watch for in 2026 and 2027?

Several changes affecting landlord cash flow are either already in force or confirmed for the next two tax years.

1. Making Tax Digital for Income Tax. From 6 April 2026, landlords and sole traders with qualifying income over 50,000 pounds must keep digital records and send quarterly updates to HMRC rather than filing a single annual return. The threshold drops to 30,000 pounds from April 2027 and 20,000 pounds from April 2028, bringing many more portfolio landlords into scope.
2. Higher property income tax rates from April 2027. The Autumn Budget 2025 confirmed that property income will move onto its own tax rates from 6 April 2027, rising by 2 percentage points across every band, to 22 percent basic rate, 42 percent higher rate and 47 percent additional rate. The Section 24 finance cost credit is expected to rise in line with the new basic rate, to 22 percent, but the overall effect for higher rate landlords holding property personally is a tighter margin, not a wider one.
3. Section 24 remains in full effect. There is no signal of the finance cost restriction itself being reversed, so any landlord who has not reviewed whether an SPV structure, a change to their mortgage mix or a restructure of ownership shares would ease the pressure should treat this as an ongoing, not a one-off, planning question.

Landlords planning to sell a property should also remember that any Capital Gains Tax due on a UK residential property disposal must be reported and paid to HMRC within 60 days of completion, not left until the following Self Assessment deadline of 31 January.

GM Professional Accountants serves clients across London and Essex, working with landlords, SPV directors and property investors from single flats to multi-property portfolios, including in Old Street, Wimbledon and Loughton.

Frequently Asked Questions

This article is for general information only and does not constitute specific accounting or tax advice. For guidance tailored to your portfolio, speak to a qualified adviser. Sources: GOV.UK, Renting out your property: paying tax, HMRC, Tax relief for residential landlords: how it’s worked out, Landlord Today, Void losses soar and landlords are footing the bill (June 2026). Related reading: Construction Company Profitable but No Cash? 7 Places Your Cash Is Getting Trapped, London SPV Accountants, Capital Gains Tax Accountants, Rental Accounts.