New research has highlighted the increasing financial pressures facing buy-to-let landlords, revealing that property investors paying basic-rate income tax could be left with less than 40% of their rental income after mortgage interest, tax and essential compliance costs.
The findings, published by property compliance company LetCompliance, raise fresh questions about the profitability of buy-to-let investing as landlords face rising expenses, additional regulations and the prospect of further tax increases.
According to the research, a typical mortgaged landlord paying basic-rate income tax retains just £39.75 from every £100 collected in rent, even before accounting for several significant property-related expenses.
Where Does Every £100 of Rental Income Go?
The study examined the financial position of landlords across England, using a model based on purchasing a property with a 25% deposit and financing the remaining 75% through a mortgage.
Its calculations suggest that every £100 received in rental payments is divided as follows:
| Expense | Amount |
| Mortgage interest | £49.10 |
| Income tax | £9.94 |
| Mandatory compliance costs | £1.21 |
| Remaining rental income | £39.75 |
However, the £39.75 remaining should not be confused with actual profit.
Landlords must still cover additional expenses, potentially including maintenance, property insurance, letting agent charges, service charges and periods when their property is unoccupied.
Depending on the individual property and financing arrangements, these expenses could substantially reduce the amount of money an investor ultimately receives.
Higher-Rate Taxpayers Face an Even Tougher Financial Position
The situation becomes particularly challenging for landlords who pay income tax at the higher rate.
LetCompliance’s research indicates that higher-rate taxpayers purchasing with a 25% deposit retain approximately £20 from every £100 in rental income after mortgage interest, income tax and the compulsory costs included in its calculations.
The analysis also suggests that in 292 of the 293 English local authority areas examined, the modelled higher-rate landlord faces a larger income tax bill than the amount remaining after the expenses included in the study.
One factor contributing to this situation is the restriction on mortgage interest tax relief for individual residential landlords.
Rather than deducting mortgage interest in full when calculating taxable rental profits, individual landlords generally receive a basic-rate tax reduction against qualifying finance costs.
This can create a considerable difference between a landlord’s taxable income and the cash actually generated by the property.
Buy-to-Let Investors Could Wait More Than a Decade to Recover Their Initial Investment
The research also examined how long it could take investors to recover their initial financial commitment through rental income.
For someone purchasing an average-priced flat in England with a 25% deposit, the estimated period is 10.5 years.
However, location makes an enormous difference.
In Boston, Lincolnshire, the estimated recovery period is approximately 4.4 years, reflecting the relationship between local property prices and achievable rents.
At the opposite end of the scale, investors purchasing in Kensington and Chelsea could face a period of around 64.2 years under the same modelling assumptions.
These calculations include the initial cash investment and modelled rental returns but exclude several ongoing ownership expenses and any increase or decrease in the property’s capital value.
The findings demonstrate why investors must consider local rental yields and purchase prices rather than assuming that all buy-to-let properties will deliver similar financial results.
More Costs Could Be Heading Towards Landlords
The financial challenges identified in the research arrive at a time when England’s private rented sector is undergoing significant regulatory changes.
Landlords are preparing for further obligations, including the introduction of a mandatory private rented sector ombudsman, which will create another potential expense for property owners.
The precise membership fee has yet to be confirmed.
Meanwhile, announced changes to the taxation of property income from April 2027 could place additional pressure on landlords’ finances, subject to the necessary legislation.
For investors already operating with narrow margins, even relatively modest additional costs may affect whether a property remains commercially attractive.
Smaller landlords with just one or two rental properties could be particularly exposed, especially where mortgage borrowing accounts for a substantial proportion of the property’s value.
Is Buy-to-Let Still a Worthwhile Investment?
Although the figures paint a challenging picture, they do not necessarily mean that residential property investment has become unprofitable.
The financial performance of a buy-to-let property depends on several factors, including the purchase price, borrowing costs, rental demand, tax position and ongoing maintenance requirements.
Investors who purchased properties several years ago at lower prices, or who have relatively small outstanding mortgages, may be in a considerably stronger financial position than landlords entering the market today.
It is also important to distinguish between monthly rental cash flow and longer-term investment returns.
Properties can potentially generate wealth through capital appreciation, while landlords with repayment mortgages may gradually increase their equity as the loan balance reduces.
However, capital growth is never guaranteed, and investors must also consider the costs and tax implications associated with eventually selling a property.
Could Falling Landlord Profits Affect Tenants?
The consequences of weaker rental profitability may extend beyond property investors.
If more landlords decide to sell their rental properties or reduce their investment activity, the number of homes available within the private rented sector could come under additional pressure.
Where rental demand remains strong, a reduction in available properties could contribute to greater competition between tenants and upward pressure on rents.
However, the wider impact will also depend on what happens to properties when landlords sell, including whether they are purchased by other investors or owner-occupiers.
Ultimately, the relationship between landlord profitability, housing supply and rental affordability is likely to remain an important issue for the property market.
What Should Property Investors Take Away From These Findings?
The latest research reinforces the importance of assessing the true financial performance of a rental property before committing to an investment.
Headline rental yields can sometimes make a property appear more profitable than it actually is once mortgage payments, taxation, maintenance, compliance obligations and potential void periods are included.
For existing landlords, reviewing borrowing arrangements, operating costs and rental income may help identify whether individual properties are continuing to meet their investment objectives.
For prospective investors, understanding the difference between gross rental income and actual net returns has arguably never been more important.
Despite the challenges, property investment can still offer opportunities for those purchasing at the right price and structuring their investments carefully.
The key question is no longer simply how much rent a property can generate, but how much of that money the landlord will actually retain.
Source: LetCompliance, Buy-to-Let by Council 2026, published 6 November 2026. Figures are based on the company’s modelling assumptions and are not representative of every landlord’s financial circumstances.
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