Selling an Investment Property in the UK

Selling an investment property — whether a buy-to-let flat, a rental house, or part of a larger portfolio — involves a set of considerations that simply do not apply to selling your main home. Capital Gains Tax, tenant rights, mortgage redemption charges, and legislative change all combine to make investment property sales among the more complex transactions in the residential market.

This guide covers the full picture: how CGT is calculated and reported, your options if you have a tenant in occupation, what the Renters' Rights Bill means for landlords planning a sale, the costs you need to account for, and how to prepare the legal documentation your solicitor will need. If you want to understand the general costs involved in any property sale, our guide to the hidden costs of selling a house is a good starting point.

Capital Gains Tax on investment property

For most sellers, CGT is the single largest financial consideration when selling an investment property. Unlike your main home, which is sheltered by Private Residence Relief, an investment property is fully exposed to CGT on any profit made.

How the gain is calculated

The taxable gain is broadly: sale price minus purchase price, minus allowable costs, minus the annual exempt amount. The deductions that reduce your gain include:

• The original purchase price
• Stamp Duty Land Tax paid on acquisition, including any higher rate surcharge for additional dwellings
• Solicitor and conveyancer fees on both the purchase and the sale
• Estate agent commission on the sale
• Capital improvement costs — such as an extension, loft conversion, or a new kitchen that genuinely added value — but not routine repairs or maintenance

You cannot deduct mortgage interest, letting agent fees, insurance premiums, or day-to-day running costs. For a worked example of how CGT is calculated on a residential investment, see our guide to Capital Gains Tax when selling a second home.

CGT rates for 2025–26

Following the changes announced in the Autumn Budget 2024, CGT on residential property for the 2025–26 tax year is charged at:

Your tax band is determined by adding the taxable gain to your income for the year, so a basic rate taxpayer with a large gain may find part of it taxed at 24% if the total pushes them above the £50,270 threshold. The annual exempt amount is £3,000 per person for 2025–26. If the property is jointly owned, each owner has their own allowance, potentially sheltering £6,000 of the combined gain. You can check current rates and allowances on the GOV.UK Capital Gains Tax rates page.

The 60-day reporting rule

Since 27 October 2021, any UK resident who disposes of a UK residential property at a gain must report it and pay the CGT due within 60 days of the legal completion date. This is done through HMRC's 'Report and pay Capital Gains Tax on UK property' service, which is separate from Self Assessment. A late filing penalty of £100 applies if you miss the 60-day deadline, with additional penalties and interest the longer the return remains outstanding. If you also file a Self Assessment return, include the gain there too, but any CGT already paid under the 60-day return is credited against your Self Assessment liability.

Selling with a tenant in place vs vacant possession

If your investment property is occupied by a tenant, you face a fundamental decision before marketing: sell with the tenant in situ, or go through the process of regaining possession first. Each route has material implications for price, speed, and legal complexity. Our detailed guide on selling a tenanted property covers the process in full, but the key trade-offs are set out below.

For more on weighing up these options — including when a sitting tenant sale makes financial sense — see our guide on selling a house with sitting tenants.

Tenant notice requirements: Section 21 and Section 8

If you decide to seek vacant possession before selling, you must follow the correct statutory process under the Housing Act 1988. For an assured shorthold tenancy (AST), the two main routes are:

Section 21 notice (no-fault)

A Section 21 notice allows you to regain possession without giving a reason. To serve a valid Section 21 you must have:

• Protected the tenant's deposit in a government-approved scheme and served the prescribed information within the required timeframe
• Provided a valid gas safety certificate, an Electrical Installation Condition Report (EICR), and a current Energy Performance Certificate at the start of the tenancy
• Given the tenant the Government's How to Rent checklist
• Ensured the fixed term has ended or a break clause is engaged (you cannot serve a valid Section 21 during the first four months of the tenancy)

The minimum notice period is two months. If the tenant does not vacate voluntarily, you must apply to the court for a possession order, which adds further time and cost.

Section 8 notice (fault-based)

A Section 8 notice is used where the tenant has breached the tenancy — for example, through rent arrears of two or more months (Ground 8), persistent late payment (Ground 11), or antisocial behaviour. Notice periods vary by ground. Ground 8 rent arrears remains mandatory and gives no judicial discretion, making it the most commonly used ground for possession.

The Renters' Rights Bill and its implications for sellers

The Renters' Rights Bill is progressing through Parliament and will abolish Section 21 no-fault evictions in England. Once enacted, all assured shorthold tenancies will become periodic, and landlords will need to rely on specific grounds under a reformed Section 8 to regain possession. The Bill is expected to introduce a new mandatory ground enabling landlords to recover possession when they intend to sell, but this ground will carry a defined notice period and a restriction on re-letting the property within a specified period after possession is obtained.

For landlords who want to sell with vacant possession, the practical effect is that gaining possession is likely to become more time-consuming and uncertain once Section 21 is abolished. According to ARLA Propertymark, many landlords are already accelerating exit decisions in anticipation of the legislative change. If you are considering selling and need vacant possession, taking legal advice on the current notice options — before Section 21 is abolished — may be worth doing promptly.

Buy-to-let mortgage considerations

Most investment properties are purchased with a buy-to-let mortgage, and the mortgage must be redeemed in full on completion. Before instructing your solicitor, it is important to check your mortgage terms for the following:

Early repayment charges

If you are within a fixed-rate period, your lender will typically charge an early repayment charge (ERC) if you redeem before the end of the deal. ERCs are usually expressed as a percentage of the outstanding balance and can range from 1% to 5% or more depending on how far through the deal you are. On a mortgage of £200,000, an ERC of 3% would cost £6,000. Request a redemption statement from your lender before agreeing a completion date, as this will also be needed by your solicitor to calculate your net proceeds.

Consent to sell

Your buy-to-let mortgage terms almost certainly do not require you to obtain the lender's consent to sell, as selling repays the mortgage. However, if you have a consent to let arrangement on a residential mortgage rather than a true buy-to-let product, you should check your specific terms with your lender before instructing a solicitor.

Redemption timing

Your solicitor will obtain a formal redemption figure from your lender once a completion date is agreed. The figure is valid for a set period (typically 28 days), so the redemption request should not be sent too far in advance. Daily interest accrues on the outstanding balance, so the redemption figure will be slightly higher if completion is delayed. For a broader look at what completion involves and how timelines work, see our guide to how long conveyancing takes.

Costs specific to investment property sales

In addition to the standard costs of any property sale — covered in detail in our guide to the hidden costs of selling a house — investment property sellers face several additional expenses:

• Capital Gains Tax. Often the largest single cost, potentially running into tens of thousands of pounds on a property that has risen significantly in value.
• Early repayment charges. If you are within a fixed rate period on your buy-to-let mortgage.
• Legal costs for tenancy documentation. Your solicitor will need to prepare and provide additional documentation to the buyer's solicitor covering the tenancy, deposit, and safety compliance, which may increase their fee.
• Void period costs. If you gain vacant possession before selling, you lose rental income during the period the property is empty. You will also continue to pay buildings insurance and may need to maintain the property during this period.
• Tax advice fees. A CGT calculation on an investment property held for many years — especially one that was previously your main home — can be complex. An accountant or tax adviser's fee is likely to pay for itself several times over.
• Cash for keys. Some landlords offer a cash incentive to encourage the tenant to vacate voluntarily by a set date, avoiding the delay and cost of formal eviction proceedings. This is a pragmatic option where the tenant is cooperative but unlikely to leave without some financial motivation.

What you need to disclose to the buyer

Investment property sales carry enhanced disclosure obligations. Your solicitor will complete the standard property information forms (TA6 and TA10), but for a tenanted property there is additional information the buyer's solicitor will require:

• A copy of the tenancy agreement and any addenda or renewals
• Deposit protection details — the scheme name, deposit amount, and confirmation that prescribed information was correctly served
• A rent schedule showing current rent, payment frequency, and arrears history
• Current gas safety certificate (must be dated within the last 12 months)
• Electrical Installation Condition Report (EICR), valid for up to five years
• Energy Performance Certificate (EPC)
• Confirmation that the How to Rent checklist was provided to the tenant and that any Section 21 prerequisites have been met
• Details of any outstanding disrepair notices, licensing requirements, or disputes with the tenant

Missing or incomplete tenancy documentation is one of the most common causes of delay in investment property transactions. Assembling these documents before you find a buyer is one of the most effective things you can do to keep the sale on track.

Choosing the right route to market

The best route to market for an investment property depends on whether you are selling with a sitting tenant, the condition of the property, and how quickly you need to complete.

• Specialist investment agent. An agent who focuses on investment and buy-to-let properties will have a database of active landlords and portfolio buyers. They market on rental yield and investment fundamentals rather than lifestyle appeal, which is what attracts serious buyers for tenanted properties.
• Auction. Property auctions give certainty of sale — exchange takes place when the hammer falls, with completion typically 28 days later. This is a popular route for tenanted properties, HMOs, and properties that need work. Auction fees are generally higher than agent commission.
• Standard estate agent. If you have achieved vacant possession and the property is in good condition, a standard high street or online agent can market to the full buyer pool, maximising your potential sale price.

Sources and further reading

• Capital Gains Tax — Overview (GOV.UK)
• Capital Gains Tax Rates and Allowances (GOV.UK)
• Report and Pay Capital Gains Tax on UK Property (GOV.UK)
• Housing Act 1988 (legislation.gov.uk)
• Renters' Rights Bill (UK Parliament)
• Conveyancing Guidance (The Law Society)
• ARLA Propertymark — landlord and letting agent guidance
• How to Rent Checklist (GOV.UK)

Related guides

• Selling a Second Home in the UK

Frequently asked questions