How to Sell a Buy-to-Let Property UK 2026: CGT, Timing and the 60-Day Trap

Record numbers of landlords are exiting the private rented sector in 2026 — yet the single most common mistake when selling is missing the 60-day Capital Gains Tax payment deadline, which runs from completion, not the end of the tax year. HMRC charges interest from day 61 and issues an automatic £100 late-filing penalty regardless of whether the eventual tax bill is paid in full.

Selling a buy-to-let property in the UK triggers Capital Gains Tax at 18% (basic-rate taxpayers) or 24% (higher or additional rate) on the net gain. The Annual Exempt Amount is £3,000 from April 2024, and you must report the disposal and pay estimated CGT via the UK Property Account within 60 days of completion. This guide covers the full CGT calculation, every allowable deduction, five legal ways to reduce the bill, and what SPV landlords must do differently on disposal.

Why landlords are selling in 2026

The combination of Section 24 mortgage interest restrictions, the Renters' Rights Act 2025 removing Section 21 no-fault evictions, rising EPC upgrade costs, and the Autumn Budget 2025 SDLT surcharge increase has accelerated landlord exits across England. According to HMRC property transaction data, disposals of additional dwellings reached multi-year highs in the first half of 2026, with higher-rate taxpayers disproportionately represented as sellers.

For many portfolio landlords, the decision to sell is primarily a Section 24 calculation: rental income is now taxed in full with only a 20% tax credit against mortgage interest, meaning higher-rate taxpayers can pay income tax on notional profits while receiving no cash surplus. For those landlords, the sale price is not just the property exit — it is the cessation of a tax liability.

"The Annual Exempt Amount for Capital Gains Tax was reduced from £6,000 to £3,000 on 6 April 2024, meaning any landlord who previously relied on partial AEA coverage of a smaller gain now faces a material taxable gain even on a modest uplift." (HMRC, Capital Gains Tax statistics, 2025)

How to calculate your CGT: step by step

The CGT calculation on a buy-to-let disposal follows four steps:

1. Gross gain: sale proceeds minus original purchase price
2. Net gain: gross gain minus allowable costs (see table below)
3. Taxable gain: net gain minus the £3,000 Annual Exempt Amount (and any brought-forward capital losses)
4. CGT payable: taxable gain multiplied by the applicable rate (18% or 24%), taking into account where the gain sits relative to your remaining basic-rate band

Worked example

Note: if you are a basic-rate taxpayer but the taxable gain plus your income pushes you into the higher-rate band, the portion within the basic-rate band is taxed at 18% and the remainder at 24%.

Allowable costs: what you can deduct

The capital improvements distinction is critical. Replacing a kitchen that was functional but outdated is typically a capital improvement (deductible). Repairing a broken boiler is a revenue expense (not deductible against the gain). If you have spent significantly on the property over the years, gather invoices before instructing your conveyancer — these deductions can materially reduce a large gain.

The 60-day payment rule

Since April 2020, any UK taxpayer who sells UK residential property generating a taxable capital gain must both report the disposal and pay the estimated CGT within 60 calendar days of the completion date. This is done via HMRC's UK Property Account, accessed through the HMRC online portal. You will need a Government Gateway account and your Capital Gains Tax unique reference number.

Completing the report and payment within 60 days does not mean you have finalised your CGT position — you will also need to include the disposal in your Self Assessment return for the relevant tax year, where the final liability is confirmed. Any overpayment in the UK Property Account is refunded; any underpayment is collected through Self Assessment. If you are not registered for Self Assessment, the 60-day report effectively stands as your final return for that disposal.

Penalties for late filing start at £100 from day 61, with daily charges adding up if the report is significantly delayed. Interest on unpaid CGT also runs from day 61. These charges apply even if you eventually pay the full tax — the penalty is for the late report, not just the late payment.

CGT rates on residential property in 2026

The rates above (18% and 24%) were introduced in the October 2024 Autumn Budget, an increase from the previous 18%/28% split. Residential property CGT rates are higher than the rates that apply to other assets such as shares, which are taxed at 10%/20%. For most higher-rate landlords with a significant gain, the CGT liability will run at 24% throughout.

Five legal ways to reduce your CGT bill

1. Time the completion date

The Annual Exempt Amount (£3,000) resets each tax year on 6 April. If you complete in late March rather than early April, you use the current year's AEA. If the deal slips past 5 April, you automatically access the next year's AEA. For larger gains with a flexible buyer, this single timing choice saves up to £3,000 × CGT rate = £720 (basic) or £720 (24%) — a small saving, but a free one.

2. Transfer a share to your spouse or civil partner

Transfers between spouses and civil partners are made on a no-gain/no-loss basis: there is no CGT on the transfer itself, and the receiving spouse acquires the asset at the original base cost. Before the sale completes, transferring 50% of the property to a spouse effectively doubles the Annual Exempt Amount available against the gain (£3,000 each = £6,000 total) and may allow part of the gain to be taxed at the lower spouse's CGT rate if they are a basic-rate taxpayer. The transfer must be a genuine gift, and the change of ownership must be registered at HMRC before the property is sold to a third party.

3. Claim Private Residence Relief if eligible

If the buy-to-let was ever your only or main home, Private Residence Relief (PRR) exempts the proportion of the gain that accrued during the period of main residence plus the final nine months of ownership. PRR does not apply to the entire ownership period for a property that was never your main home. Lettings Relief, which previously supplemented PRR for properties that were rented after a period of owner-occupation, was significantly curtailed in April 2020 and now applies only in the narrow case where the landlord shares the property with the tenant — effectively removing it for most standard BTL disposals.

4. Offset capital losses

Capital losses from other asset disposals in the same tax year, or losses carried forward from prior years, can be set against the gain before the Annual Exempt Amount is applied. Investors who have realised losses on share portfolios, cryptocurrency, or other assets should review whether any losses are available to offset the property gain. Losses are not wasted if the gain is covered by the AEA — they carry forward automatically to future years via Self Assessment.

5. Ensure all capital improvement expenditure is captured

Many landlords under-claim capital improvement expenditure because they have not kept records systematically over a long ownership period. A full refurbishment, a loft conversion, an extension, rewiring, and replacement of kitchens or bathrooms that materially enhance the property all qualify. Gather invoices and bank statements going back to acquisition. Even recovering £20,000 in legitimate improvement costs can reduce a higher-rate taxpayer's CGT bill by £4,800.

Selling a property held in a limited company

A limited company does not pay Capital Gains Tax — it pays Corporation Tax on the gain at either 25% (main rate, profits above £250,000) or 19% (small profits rate, profits below £50,000), with marginal relief between those thresholds. There is no Annual Exempt Amount for companies, and the 60-day CGT reporting rule does not apply. The gain is included in the company's Corporation Tax return for the relevant accounting period.

The more significant issue for SPV landlords is double taxation on extraction. Once the company has paid Corporation Tax on the gain, distributing the remaining proceeds to the director-shareholder as dividends attracts dividend tax at 8.75% (basic rate), 33.75% (higher rate), or 39.35% (additional rate) above the £500 dividend allowance. A combined Corporation Tax plus dividend tax rate can exceed 24% personal CGT for higher-rate shareholders in many scenarios. Before assuming the company route is more efficient on disposal, model the extraction cost explicitly with an accountant.

Practical checklist for selling a buy-to-let in 2026

1. Instruct a specialist property accountant before exchange — do not rely on your conveyancer for CGT advice.
2. Gather all capital improvement invoices going back to the acquisition date, including original purchase receipts and SDLT certificate.
3. Calculate the estimated taxable gain before exchange and set aside the estimated CGT — do not wait until the 60-day window to discover the liability.
4. Consider timing the completion date relative to 5 April if you have flexibility with the buyer.
5. Consider spousal transfer before exchange if your spouse is in a lower tax band or has unused capital losses.
6. Set up or log in to your UK Property Account (HMRC online) before completion so you are not scrambling for the portal immediately after completion.
7. File and pay via UK Property Account within 60 days of completion — the completion date is on the transfer deed; this is the clock start date.
8. Include the disposal in your Self Assessment return for the relevant tax year, even if you have already paid via the UK Property Account. Failure to declare in Self Assessment is a separate HMRC compliance issue.

What to do with the proceeds

Landlords exiting BTL in 2026 often reinvest into assets without the same legislative exposure. Property crowdfunding and IFISAs offer property-backed returns with no CGT event until platform redemption, and returns sit outside your estate for ISA allowance purposes. REITs within an ISA or SIPP generate property income distributions exempt from CGT entirely — gains are realised within the REIT structure, and the 90% distribution obligation means investors receive most of the income. For landlords who remain in property, converting proceeds into a limited company purchase avoids the personal CGT exposure on future disposals within the structure, though the extraction cost on eventual winding-up remains.

The Autumn Budget 2026, expected in October or November, may amend CGT rates or Annual Exempt Amount thresholds again. Investors who are close to completing a sale should model the impact of potential CGT rate changes and may wish to exchange and complete before the Budget date if a rate increase is being trailed.

This article is educational and does not constitute financial, tax, or legal advice. CGT rates, thresholds, and reporting deadlines are correct to the best of our knowledge as of October 2026 but are subject to change. Always obtain professional tax advice from a qualified accountant or tax adviser before selling an investment property.