Hold or Sell? How to Decide When a Buy-to-Let Is No Longer Worth Keeping

Record numbers of UK landlords are selling up. But not all of them should be.

The proportion of buy-to-let properties being listed for sale hit a multi-year high in 2025, driven by Section 24, rising mortgage rates, and the looming Renters Rights Act. Some of those exits make complete financial sense. Others are emotional decisions that will cost landlords dearly in CGT, only to reinvest in something with similar or worse returns.

The question is not whether the market is tough. It clearly is. The question is whether your specific property still makes sense to hold, given your full financial picture.

Here is how to work through it properly.

---

Start With the Real Numbers

Most landlords who say a property "isn't worth it anymore" have not actually done the maths recently. They have a feeling. That feeling may be right, but you need the numbers to know for certain.

Run this calculation:

Annual gross rent Minus: mortgage interest (not repayment) Minus: agent fees (typically 10-15% if managed) Minus: insurance Minus: maintenance budget (1-2% of property value per year is a reasonable allowance) Minus: void allowance (3-5% of gross rent) Minus: ground rent and service charge (if leasehold) Minus: tax on profit (at your marginal rate, remembering Section 24 means you are taxed on income before deducting mortgage interest) = Net annual cashflow

Divide that by the current market value of the property. That is your net yield on current value.

If that number is under 2-3%, you are holding an asset with a low income return. Whether that is acceptable depends entirely on what you believe about future capital growth, and what your alternatives are.

---

The Capital Growth Question

A poor cashflow can be justified if the property is in an area with strong, reliable capital appreciation. A flat in central London yielding 1.5% net might still be a rational hold if you believe it will be worth 20% more in five years.

The problem is that capital growth is a prediction, not a fact. And many landlords have been holding underperforming properties for years on the basis of capital growth that has not materialised.

Ask yourself: if you sold today and reinvested the equity elsewhere, what could you earn? If you have £150,000 of equity sitting in a property yielding 1.8% net, that same money in a diversified portfolio or a different property in a higher-yielding region could be working considerably harder.

Opportunity cost is real. It just does not show up on a spreadsheet unless you put it there.

---

When Selling Clearly Makes Sense

There are situations where the hold case is genuinely weak:

Persistent problem tenants or chronic voids. If a property has had more than two extended voids in three years, or has required legal action to recover possession, the management burden may outweigh the financial return. Your time has value.

Significant deferred maintenance. Properties needing major work (roof, windows, rewire, EPC upgrade) represent a large near-term capital outlay. If the work will cost £30,000 and the property yields £6,000 net per year, you are looking at five years just to recover that spend before you are ahead again.

Negative cashflow with no near-term improvement in sight. If you are topping up the mortgage from your own pocket every month, you are effectively paying to hold an asset. That can be rational if capital growth is strong and you can afford it. But it needs to be a conscious, informed decision, not something you are tolerating because selling feels like admitting defeat.

A change in your personal circumstances. Retirement, divorce, illness, or a desire to simplify your finances are all legitimate reasons to sell, regardless of the numbers.

---

When Holding Still Makes Sense

Equally, there are situations where the case for holding is stronger than it appears:

You are in a fixed-rate mortgage that resets soon. Many landlords took out five-year fixes at sub-2% rates in 2019-2020. Those are now expiring. Before selling, model what the cashflow looks like on a new rate. It may be worse than your current position, but still better than you think once you factor in CGT on a sale.

You have significant capital gains. If you have owned the property for many years, the CGT bill on a sale could be substantial. With the allowance now just £3,000 and rates at 18-24% for residential property, a £100,000 gain could cost you £20,000-£24,000 in tax. That changes the sell decision materially.

The property is in your pension strategy. For some landlords, a mortgage-free property delivering clean cashflow in retirement remains a sound plan. The calculus is different if you are 15 years from retirement versus already drawing income from it.

Rents are rising in your area. If local rents have moved significantly since you last reviewed the numbers, your yield may look better than you think. It is worth getting a fresh rental appraisal before making any decision.

---

The Tax Trap Most Landlords Walk Into

Selling a buy-to-let without proper planning is one of the most expensive financial mistakes a landlord can make.

The key points to understand:

• CGT is due on the profit above your base cost (purchase price plus allowable improvement costs), minus your annual CGT allowance of £3,000
• You have 60 days from completion to report and pay CGT via HMRC's online service. Missing this deadline results in automatic penalties
• Principal Private Residence relief may be available if you ever lived in the property. Speak to an accountant about whether this applies
• Losses from other property disposals in the same tax year can be offset against gains

If your gain is large, it may be worth staggering a sale across two tax years, or considering other reliefs. An hour with a property-specialist accountant before you sell can save you thousands.

---

A Simple Decision Framework

If you are still unsure, work through these four questions:

1. Is the net yield (after tax) above 3% on current market value? If yes, the income case for holding is reasonable. If no, move to question 2.

2. Do you have a credible, specific reason to believe capital values will rise significantly in the next five years? Not "property always goes up". Give yourself a specific, location-based reason. If yes, the hold case may still stand. If no, move to question 3.

3. What is your CGT exposure? If selling triggers a large bill, factor that into the comparison. A property yielding 2% with £80,000 of embedded gain may be better held than sold.

4. Is there a better use for the capital? Be honest. If you have no clear answer for where the money goes after selling, you may end up with it sitting in cash earning less than the property.

---

The Bottom Line

Selling a buy-to-let is not failure. Holding one that is draining you financially and emotionally is not loyalty. It is inertia.

Do the numbers properly. Factor in tax. Consider your alternatives. And if you are still unsure, a good property accountant or independent financial adviser will pay for themselves many times over.

The landlords who will do well over the next decade are not the ones who blindly hold or blindly sell. They are the ones who make deliberate, informed decisions about each asset in their portfolio.

RealYield's calculators can help you run the numbers on your specific property. Start with the yield calculator at realyield.co.uk.