Which Rental Properties Should You Keep, Refinance or Sell? A Landlord’s Financial Test starts with one rule: judge each property on its own numbers. Keep the ones that earn well on the equity inside them, refinance the ones with a poor mortgage or lazy equity, improve the ones with fixable problems, and sell the ones that fail on cash flow, risk or future spending.
Rental profits move to new tax rates on 6 April 2027, and any taxable residential sale must be reported and paid within 60 days of completion, so the decision has a clock on it.
SZ | Written by Sharaz Zaman, Founder of GM Professional Accountants, AAT Member with 15+ years London accounting experience. Updated in September 2026. Tax figures are for 2026/27 unless stated. |
1 | Total rent tells you very little. Every property needs its own cash flow, equity, mortgage and cost picture. |
2 | Each property faces one of four decisions: keep, improve, refinance or sell. |
3 | Seven numbers drive the decision: cash flow, equity tied up, mortgage rate, net yield, maintenance, voids and arrears, and future capital needs. |
4 | Rental profits face new tax rates on 6 April 2027, and MTD ITSA reaches landlords with income above £30,000 on the same day. |
5 | A sale triggers a Capital Gains Tax return within 60 days, so plan before you list. |
A rental property financial test is a structured review of each property in a landlord’s portfolio, comparing cash flow, equity, mortgage rate, net yield, running costs and future capital needs to decide whether to keep, improve, refinance or sell it.
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Which Rental Properties Should You Keep, Refinance or Sell? A Landlord’s Financial Test for London Portfolios
Picture a typical London landlord with ten to twenty properties. Rent lands every month, the accounts show a healthy total and the tax return gets filed on time. Yet ask which three properties are genuinely building wealth, and which three are quietly holding the rest back, and most landlords cannot answer with confidence.
That gap is the pain. A landlord in Ilford, Wimbledon or East London may hold flats bought in different years, on different mortgages, with different repair histories and tax positions. Each property behaves like a small business, but most portfolios are managed as one lump. Strong performers hide weak ones, and weak ones keep absorbing cash, equity and attention.
We regularly see London landlords who know their total rent and total mortgage balance, but not which single property earns least for the money tied up in it. This guide, Which Rental Properties Should You Keep, Refinance or Sell? A Landlord’s Financial Test, shows you the questions worth asking. It will not hand you a formula, because the right answer depends on your borrowing, tax position and goals.
What Are the Four Decisions Every Rental Property Faces?
At any moment, each property in your portfolio sits in one of four positions. The skill lies in knowing which one.
None of the four is a default. Doing nothing is also a decision, and often the most expensive one. Most landlords keep everything because keeping feels safe, but holding a weak property has a real cost: the equity inside it could be doing something else.
How a property lands in one of the four boxes depends on how several numbers interact. The next section names those numbers. It does not weigh them.
Why Does Total Rent Hide Which Properties Actually Make Money?
Total rent is the most flattering number in property. It rises with every property you add, including bad ones, and it ignores the mortgage, repairs, empty months and tax. A portfolio can show £15,000 of rent a month and still leave its owner wondering why the bank balance barely moves.
Seven numbers tell the real story for each property. None is complicated. The difficulty is collecting them property by property and reading them together.
1 | Cash flow by property What is left each month after mortgage, fees, insurance, repairs and empty months. Not the rent, but what remains. |
2 | Equity tied up Value minus mortgage. This is your money, and it is either working or sleeping. |
3 | Mortgage rate The interest you pay, and when the current deal ends. Identical flats behave very differently on different rates. |
4 | Net yield Rent after running costs, as a share of value. It shows how hard the building works before finance costs. |
5 | Maintenance The steady cost of keeping the property lettable, including jobs that keep getting postponed. |
6 | Voids and arrears Months without rent, and rent that arrives late or never. Small gaps add up across many properties. |
7 | Future capital requirements Big bills you can already see coming, such as a roof, a boiler or the energy upgrades expected by 2030. |
Each number alone can mislead. A high yield can sit on a fragile mortgage. Large equity can sit in a property that barely covers its costs. Reading the numbers together, against your tax position and goals, is where the judgement lies. We do not publish how we weigh them, because the weighting changes from one landlord to the next.
What Causes a Rental Property to Underperform Without You Noticing?
Rarely does one dramatic event turn a good property into a weak one. It is usually a slow drift. These are the causes we see most often across London and Essex portfolios.
1 | A mortgage on the wrong terms The Bank of England held Bank Rate at 3.75% on 17 September 2026, and three members voted to raise it to 4%. If a fixed rate ends soon, the next deal may cost more than you expect. |
2 | Rent that has not kept pace Provisional Office for National Statistics figures show average UK private rent rose 3.8% to £1,400 in the 12 months to August 2026. A tenant on an old rent may cost you more than you realise, and rent rises now follow the formal Section 13 process, so reviews need planning. |
3 | Equity that sits unused The same release shows UK house prices rose just 1.4% to £273,000 in the 12 months to July 2026. With growth that slow, a property that has sat at the same value for years may hold a large sum earning a modest return. |
4 | Repairs, voids and arrears that creep up A small job that waits becomes a bigger one, and one empty month looks harmless until you multiply it across fifteen properties. Since 1 May 2026, Section 21 no fault notices have ended in England, so problem tenancies deserve earlier attention. |
5 | Tax that quietly reduces the return Under Section 24, individual landlords cannot deduct mortgage interest from rental profit. They receive a tax credit worth 20% of finance costs instead, so a higher rate taxpayer with large borrowing can see a wide gap between paper profit and profit after tax. |
6 | Growth that was never planned Portfolios often grow through inheritance, letting an old home or a deal that felt right at the time. Nobody then asks whether each property still earns its place. |
7 | Records that stop at the year end When rent, mortgage and repair records sit in different places, nobody sees a property level picture until the tax return is prepared. By then the year is over. |
Which Tax and Rule Changes in 2026 and 2027 Affect Keep, Refinance or Sell Decisions?
Several dates sit close together and push in different directions. This table gathers the ones that matter most to a landlord deciding what to do with each property.
| Change | When | Why it matters to your portfolio |
| Renters’ Rights Act reforms (England) | 1 May 2026 | Section 21 no fault notices ended and fixed terms became periodic tenancies. Plan exits and problem tenancies around Section 8 grounds. |
| Higher dividend tax rates | 6 April 2026 | The ordinary rate is 10.75% and the upper rate 35.75%, so profit taken from an SPV as dividends costs more. |
| MTD ITSA for landlords | 6 April 2026 above £50,000, 6 April 2027 above £30,000, 6 April 2028 above £20,000 | Digital records and quarterly updates. Property level records make this far easier. |
| Separate property income tax rates | 6 April 2027 | Individuals in England, Wales and Northern Ireland pay 22%, 42% or 47% on rental profit, and the Section 24 credit rises to 22%. |
| Higher energy standard (EPC C equivalent) | 1 October 2030 (planned) | Confirmed in January 2026 with a planned £10,000 cost cap per property, subject to final regulations. Today’s minimum is EPC E. |
| Capital Gains Tax on residential property | 2026/27 tax year | Rates of 18% and 24%, a £3,000 annual exempt amount, and a 60 day report and payment deadline. |
Two dates deserve extra attention. The GOV.UK policy paper on property income tax rates confirms separate rates of 22%, 42% and 47% from 6 April 2027, and the MTD ITSA threshold falls to £30,000 on the same day. A landlord with several properties can cross that line without ever feeling wealthy.
None of these changes tells you to sell. They change the maths for some properties more than others. A well financed property may barely notice, while one with a large mortgage and a higher rate taxpayer as owner may feel it sharply. That difference is the point of a review. The Renters’ Rights Act applies in England, so it affects landlords in London and Essex alike.
What Does a Simple Two Property Example Look Like?
The figures below are an illustration, not a client case. They are before tax and capital costs, and simplified on purpose. Both properties look healthy on a rent statement.
| Measure for one year | Property A | Property B |
| Market value | £400,000 | £300,000 |
| Mortgage | £150,000 | £225,000 |
| Equity tied up | £250,000 | £75,000 |
| Annual rent | £24,000 | £19,200 |
| Running costs | £6,000 | £5,700 |
| Mortgage interest | £6,000 (4.0%) | £13,500 (6.0%, interest only) |
| Net yield before finance costs | 4.5% | 4.5% |
| Cash left before tax | £12,000 | £0 |
| Cash return on equity | 4.8% | 0.0% |
Look at net yield. Both properties return 4.5% before finance costs, so on a yield table they look identical. Below that line the story changes. Property A earns £12,000 in cash on £250,000 of equity. Property B earns nothing on £75,000 of equity, and one empty month would push it into a loss. If mortgage rates rose one percentage point, Property B would cost another £2,250 a year.
Now the harder questions, which the table cannot answer. Would you buy Property A today with £250,000 of your own money? Could that equity earn more elsewhere? What would selling Property B cost in Capital Gains Tax? Does either need a roof, a boiler or an energy upgrade? Those answers decide whether each property is a keep, an improve, a refinance or a sell. We have left them out on purpose.
Does Owning Personally or Through an SPV Change the Answer?
Sometimes. An SPV, or special purpose vehicle, is a limited company set up to hold property. Section 24 does not apply to companies, so an SPV deducts mortgage interest in full and pays Corporation Tax instead of the new property income rates. Our guide to how an SPV works for property investment covers the basics.
The catch is that structure has a cost. Moving an existing property into a company can trigger Capital Gains Tax and Stamp Duty Land Tax unless a relief applies, and dividends now face rates of 10.75% and 35.75%. The answer is rarely all or nothing, so our property accountants in London test the options first, and our article on planning for future property taxes explains why timing matters.
How Much Tax Could You Pay When You Sell a Rental Property?
Selling a rental is not the same as selling your own home. Capital Gains Tax applies to the profit: the sale price less what you paid and allowable costs such as legal fees and qualifying improvements. For 2026/27 the annual exempt amount is £3,000, and gains are taxed at 18% within the basic rate band and 24% above it. If tax is due on a UK residential property, you must report and pay within 60 days of completion, and a late return brings an immediate £100 penalty.
Married couples and civil partners may be able to use two allowances, which is worth checking before you exchange contracts. If you plan to buy again, additional dwellings currently carry a 5% Stamp Duty Land Tax surcharge. With tenants in place, take legal advice under the Renters’ Rights Act. Our Capital Gains Tax specialists in London and Essex work through the gain before you commit.
What Warning Signs Suggest Your Portfolio Needs a Closer Look?
If several of these sound familiar, your portfolio may be hiding something.
1 | You cannot state each property’s monthly cash flow without opening a spreadsheet. |
2 | Rent statements look healthy, but your bank balance does not grow as the numbers suggest. |
3 | A fixed rate ends within twelve months and you have not priced the replacement. |
4 | You keep a property mainly because you have always owned it. |
5 | Repairs on one property are paid from the rent of another. |
6 | Empty periods or late payments are becoming more frequent. |
7 | Your equity has grown, but you have never asked what it could do elsewhere. |
8 | You do not know what a sale would trigger in tax and costs. |
9 | Your accountant sees year end totals, not property level figures. |
Recognising yourself here is not a failure. Most portfolios look like this when they outgrow the systems behind them.
What Is the Question Most Landlords Cannot Answer?
Try answering these three questions without looking anything up.
1 | If you had to sell one property this year, which would it be, and why? |
2 | If you were buying again today, with today’s rates and rules, which of your current properties would you buy? |
3 | If a lender offered to release £100,000 of equity, which property should it come from? |
Most landlords answer with a gut feeling. Gut feeling is not worthless, but it rarely survives contact with the numbers. The properties owners love are often not the ones that earn.
That is the gap. Most landlords know their total, but few can rank their properties. Closing it is the difference between owning property and running a property business, and you do not need twenty properties to feel it. Owners of three or four face the same blind spot.
What Does a Portfolio Performance Review Involve?
Answering Which Rental Properties Should You Keep, Refinance or Sell? A Landlord’s Financial Test properly takes real numbers. Our Portfolio Performance Review puts your properties side by side, using your own figures, and shows where each one stands: keep, improve, refinance or sell. It covers the seven areas in this guide, together with your tax position, borrowing and goals. We do not publish the scoring or decision rules, because a generic checklist cannot judge your properties.
GM Professional Accountants serves landlords and property investors across London and Essex, including Ilford, Wimbledon, Old Street and East London. Ask for a Portfolio Performance Review and we will talk you through it.
What Do Landlords Ask Before Deciding to Keep, Refinance or Sell?
How do I decide which rental property to sell first?
Compare each property on its cash flow, equity, mortgage rate, net yield, maintenance, voids and arrears, and future capital needs, not on rent alone. The weakest performers on that combined view are candidates for improvement, refinancing or sale. Check the Capital Gains Tax and the timing first, because tax can change the ranking.
Is it better to refinance or sell a rental property?
Refinancing suits a sound property with a poor mortgage or plenty of unused equity. Selling suits one that no longer earns enough for the capital and risk it needs. With Bank Rate at 3.75% in September 2026 and three committee members voting for a rise, check borrowing costs carefully. Selling triggers Capital Gains Tax and other costs.
How much Capital Gains Tax will I pay when I sell a rental property?
For 2026/27, residential property gains are taxed at 18% within your basic rate band and 24% above it, after the £3,000 annual exempt amount. If tax is due, you must report and pay within 60 days of completion. Your bill depends on your gain, your allowable costs and your other income.
Do the April 2027 tax changes mean I should sell my rental properties?
Not automatically. From 6 April 2027, individual landlords in England, Wales and Northern Ireland pay 22%, 42% or 47% on rental profit, and the finance cost credit rises to 22%. Selling has its own tax cost, so the answer depends on how each property performs and how you own it.
Should I move my rental properties into a limited company?
Not as a default. A company deducts mortgage interest in full and pays Corporation Tax, but moving existing properties can trigger Capital Gains Tax and Stamp Duty Land Tax, and dividends face rates of 10.75% and 35.75%. Model the outcome property by property first.
How often should I review my rental portfolio?
At least once a year. Review again when a fixed rate is about to end, before major repairs, before any sale, and when tax rules change, such as on 6 April 2027.
Book a free consultation with GM Professional Accountants and ask for a Portfolio Performance Review of your rental portfolio.
Disclaimer: This content is for general guidance only and does not constitute financial or tax advice. Tax rules change and how they apply depends on your individual circumstances. Please speak to a qualified accountant before acting on anything here.
