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.

Frequently Asked Questions

When should a landlord consider selling a buy-to-let?

When the net yield after all costs and tax falls below what you could earn elsewhere with less hassle, when the property is chronically difficult to let, or when your personal financial situation has changed significantly. Capital growth alone is not enough justification if the cashflow is consistently negative.

What are the tax implications of selling a buy-to-let in 2026?

You will likely pay Capital Gains Tax on any profit above your annual CGT allowance, which is now just £3,000. The rate is 18% for basic rate taxpayers and 24% for higher rate taxpayers on residential property. You must report and pay within 60 days of completion.

Is it better to sell or transfer a buy-to-let to a limited company?

Transferring to a limited company triggers a stamp duty and CGT event as if you had sold at market value. It is rarely tax-efficient unless the property has low equity and low capital gains. Always get specialist tax advice before proceeding.

How do I calculate if my buy-to-let is still profitable?

Take your annual rental income, subtract all costs (mortgage interest, agent fees, insurance, maintenance, void allowance, ground rent and service charge if leasehold), then subtract your tax liability. Divide the result by the current market value of the property to get your net yield on current value.

What happens to my mortgage if I sell a buy-to-let?

The mortgage is repaid from the sale proceeds at completion. If you are in a fixed-rate period, you may face early repayment charges. Check your mortgage terms before committing to a sale timeline.