Selling a buy-to-let property sounds straightforward: find a buyer, agree a price, pay the solicitor and estate agent, clear the mortgage, then work out the Capital Gains Tax later.
Selling a buy-to-let property usually For a UK resident landlord who has Capital Gains Tax to pay on the disposal, the gain generally needs to be reported and the CGT paid within 60 days of completion. You may still need to include the disposal on your Self Assessment return as well.
That is why, when a client tells me they are thinking of selling a rental property, I would much rather have the conversation before contracts are exchanged than after the solicitor has sent them the proceeds.
Key Takeaways
- 60-day CGT reporting deadline: The clock starts from completion, not exchange, and missing it can lead to interest and penalties.
- CGT applies to the gain, not sale proceeds: Your mortgage balance does not reduce the taxable gain.
- CGT rates for landlords: Individuals typically pay 18% or 24%, depending on their income tax band.
- Property income tax is separate: New rental income tax rates from April 2027 do not apply to Capital Gains Tax on property sales.
- More landlords are selling: Many landlords are exiting the market, but reporting mistakes can still result in penalties.
- Good records can reduce tax: Keeping evidence of improvements, occupation history, and losses can help manage your CGT liability.
What Tax Bills Can Arise When You Sell a Buy-to-Let Property?
The main tax bill on selling a buy-to-let property is Capital Gains Tax, charged on the profit after deducting the purchase price, buying and selling costs, and qualifying capital improvements.
Depending on circumstances, you may also face SDLT consequences if restructuring ownership beforehand, or Corporation Tax instead of personal CGT if a company owns the buy-to-let property.
For most individual landlords selling a single buy-to-let property, CGT is the tax that matters. But it rarely arrives alone. A sale can also trigger:
- A 60-day reporting and payment obligation: separate from Self Assessment.
- A shift in your Income Tax position for the year: since income determines how much falls at 18% versus 24%.
- SDLT considerations: if ownership is restructured beforehand.
- Corporation Tax rather than personal CGT: if a company owns the property.
- Penalties and interest: if the 60-day deadline is missed notices for failing to notify a disposal roughly doubled to 1,665 in 2024–25.
Knowing which of these applies before you exchange contracts is what separates a manageable tax bill from an expensive surprise.
The first thing to understand: 60 days means 60 days
For a UK resident selling UK residential selling a buy-to-let property with CGT to pay, the disposal return and payment are normally required within 60 days of completion not exchange, and not the end of the tax year.
This is one of the most important parts of the whole exercise, because completion the day legal ownership transfers is not when you decided to sell, and not your next Self Assessment filing date. That distinction matters because exchange and completion can be weeks apart.
The date of disposal used to determine which tax year a gain falls into is generally linked to the date of the unconditional contract, often exchange. But the specific 60-day reporting deadline runs from completion two different dates matter for two different reasons.
Reporting and payment are made through HMRC’s Capital Gains Tax on UK property account, which requires a Government Gateway account worth setting up before you need it.
Do I Always Have to File a 60-Day Return?
No, if you are UK resident and the gain is fully covered by reliefs, losses or your Annual Exempt Amount so that no CGT is due, you will not normally have the same 60-day reporting requirement simply because buy-to-let property was sold.
Non-residents face wider obligations and can be required to report even where no tax is ultimately payable. This is worth getting right, as poor advice circulates online.
The practical rule: don’t assume every sale needs a 60-day report, but do establish the CGT position immediately, because if tax is due, the clock runs from completion regardless of when you get around to calculating it.
How Much Capital Gains Tax Does a Landlord Pay?
For individuals, the standard CGT rates on a buy-to-let property are currently 18% on gains that fall within your unused basic-rate band, and 24% on the balance above it.
The rate isn’t determined simply by looking at your salary and saying “I’m a basic-rate taxpayer, so I’ll pay 18%.” Your taxable gain is stacked on top of your taxable income, so a large gain can straddle both rates.
Suppose your taxable income leaves £15,000 of the basic-rate band unused, and you make a taxable gain of £100,000: the first £15,000 may fall at 18%, and the remaining £85,000 at 24%.
That’s very different from applying one rate to the whole gain, and it’s a common source of underestimated bills. Current rates are confirmed on gov.uk.
The Annual Exempt Amount and What It’s Worth Now
Most individuals currently have a Capital Gains Tax Annual Exempt Amount of £3,000, and it remains at that level for 2026/27.
It still matters, but on a substantial buy-to-let property gain it rarely changes the overall picture dramatically. Not long ago it was £12,300 a far more meaningful part of CGT planning.
If you and your spouse each own part of a property, each person’s gain and allowance are considered separately, which can matter for larger portfolios. But don’t build a sale strategy around a £3,000 exemption; it isn’t the lever it used to be.
New Property Income Tax Rates From 2027 — Don’t Confuse Them With CGT
From April 2027, the Government has announced separate Income Tax rates for property income of 22% (basic), 42% (higher) and 47% (additional) these apply to rental income, not to Capital Gains Tax on the sale of a buy-to-let property.
There’s already confusion about this, and we expect it to worsen as several property tax changes land around the same time. Rental income and capital gains are different taxes on different events.
Selling a buy-to-let property remains a capital gains question under existing CGT rules it doesn’t suddenly become taxed at 22%, 42% or 47% just because those figures are in the news.
How Do You Calculate the Gain?
The gain is sale proceeds less allowable acquisition costs, purchase and sale costs, and qualifying capital improvement expenditure not sale price less outstanding mortgage.
At its simplest:
Sale proceeds
less allowable acquisition cost
less allowable purchase and sale costs
less qualifying capital improvement expenditure
= capital gain before reliefs and losses
Your outstanding mortgage has virtually nothing to do with the calculation itself it affects how much cash you walk away with, not the size of the gain.
That creates an unpleasant surprise for highly geared landlords: sell for £300,000, repay a £220,000 mortgage, and you might think you made £80,000. But if you bought for £120,000, your tax gain could be far greater than the cash you receive after clearing the debt.
What Costs Can You Deduct?
Allowable expenditure generally includes the original purchase price, incidental acquisition and disposal costs such as legal and agent fees, SDLT paid on purchase, and qualifying capital improvements still reflected in the buy-to-let property when sold.
HMRC recognises professional fees such as solicitors, surveyors, valuers and agents, plus SDLT and certain conveyancing costs. On sale, this commonly means estate agent fees, legal fees and qualifying valuation costs.
You may also deduct capital expenditure incurred improving the property, provided it satisfies the CGT rules and is still reflected in the property at disposal. HMRC distinguishes these from ordinary repairs and maintenance and that distinction is where record-keeping suddenly gets interesting.
Repairs vs Improvements: Why Records Matter
Ordinary repairs and maintenance are relevant to rental-income tax in the year they’re incurred and don’t reduce your capital gain later; genuine capital improvements can form part of your CGT base cost, but only if you can evidence what was spent, when, and on what.
Imagine you bought a buy-to-let property 18 years ago and, since then, spent money on decorating, fixing boilers, replacing roof tiles, building an extension, converting a loft, adding a bathroom, and replacing a basic kitchen with a materially enhanced layout. Some of that was ordinary repair and maintenance; some may have been capital improvement expenditure.
The two categories are treated differently, and this is where landlords regularly lose money through poor records, they know they spent, say, £50,000 improving a property, but can’t prove when, what, or which part related to improvement rather than repair. Twenty years of invoices rarely reconstruct themselves.
Practical tip: For property you expect to hold long term, keep a running capital improvements schedule from day one invoices, plans, contracts, acquisition statements, SDLT records. It takes minutes to update as you go; recreating one fifteen years later can take days and still produce a worse result.
Private Residence Relief for Former Homes
If a buy-to-let property was genuinely your only or main residence for part of your ownership, Private Residence Relief (PRR) can exempt part of the gain, and the final nine months of ownership are generally treated as exempt too, provided it qualified as your main residence at some point.
This comes up frequently with so-called accidental landlords: someone buys a flat as their first home, lives there five years, then moves in with a partner and rents but-to-let property out for ten more.
The entire gain is not automatically taxable simply because the property was rented when sold the full ownership history needs examining. Full conditions sit on gov.uk’s guidance on tax relief when selling your home.
What Happened to Lettings Relief?
Since April 2020, Lettings Relief has generally been restricted to situations where the owner and tenant occupied the property at the same time, rather than the classic case of moving out and letting the whole former home to someone else.
This is another area where memory can be expensive. Landlords who had once lived in a property could often claim a generous Lettings Relief for periods it was subsequently rented.
That relief can still be worth up to £40,000 per owner where the narrower conditions are met, but most former-home-turned-buy-to-let property situations no longer benefit as they once did. Tax law has a habit of moving on while people’s memory of the old rules doesn’t.
Selling a Jointly Owned Property
Where two people jointly own a buy-to-let property, each is taxed on their own share of the gain, and transfers between spouses living together are normally made on a no-gain/no-loss basis for CGT which can create legitimate planning opportunities before a sale.
Suppose one spouse owns 100% of the buy-to-let property but pays higher-rate tax, while the other has little taxable income. Transferring a genuine beneficial interest before disposal may allow the couple to use two Annual Exempt Amounts and more than one basic-rate band.
This is not a name change on a spreadsheet the day before completion the transfer has to be real, with genuine mortgage, legal and Income Tax consequences.
Don’t try to change ownership after exchange. An unconditional contract can fix the date of disposal at exchange even though completion happens later, so leaving spouse planning until after exchange may be too late.
This is why advisers keep saying: speak to us before you sell, we simply know which options disappear once legal commitments have been made.
Using Capital Losses
Allowable capital losses from previous property sales, shares or other chargeable assets may offset against a buy-to-let property gain, subject to normal CGT rules, and unused losses from earlier years can potentially be carried forward if properly claimed.
Current-year losses are generally considered when calculating your overall net gains for the tax year, which is one reason a property gain should never be calculated in isolation your wider capital tax position can materially change what you actually owe.
Timing a Sale Around 5 April
Because CGT works by tax year, timing a sale of a buy-to-let property around 5 April can affect which year a gain falls into, and therefore which rates, allowances and losses apply but the disposal date rules around exchange must be considered alongside the completion-based 60-day deadline.
A sale completing on one side of the tax-year boundary may fall into a different tax year from one completing shortly afterwards. Why might that matter? Perhaps your income will be lower next year, losses become available, another gain is expected, or spouse planning is involved.
You shouldn’t wreck a commercially sensible transaction purely to move it across a tax-year boundary but where you have flexibility over timing, it’s worth understanding the tax effect first.
Worked Example: Calculating the Gain
A landlord who bought a buy-to-let property for £140,000, spent £41,000 on purchase costs and improvements, and sold for £300,000 with £7,000 of sale costs has a gain before reliefs of £112,000 reliefs, losses, the Annual Exempt Amount and marginal rate still apply after that.
Take a landlord in Greater Manchester who bought a buy-to-let property for £140,000, with allowable purchase costs (SDLT and legal fees) of £6,000. Over the years they spent £35,000 on qualifying capital improvements, then eventually sold for £300,000, with sale costs of £7,000.
| Item | Amount |
|---|---|
| Sale proceeds | £300,000 |
| Less purchase price | −£140,000 |
| Less purchase costs | −£6,000 |
| Less qualifying improvements | −£35,000 |
| Less sale costs | −£7,000 |
| Gain before reliefs and exemptions | £112,000 |
From there, you would consider Private Residence Relief if relevant, allowable capital losses, the Annual Exempt Amount, joint ownership, and the individual’s taxable income to establish how much of the gain falls at 18% or 24%. Saying “I bought it for £140,000 and sold it for £300,000, so I made £160,000” is not a tax computation it’s the beginning of one.
The Incorporation Trap
Moving a personally owned buy-to-let property into a company you control is treated as a disposal at market value for CGT, and can also be charged to SDLT at market value, even though no cash changes hands so it can trigger a real tax bill without a sale to an outsider.
This catches property owners repeatedly. Somebody owns several properties personally, hears that companies can be more tax-efficient, and decides to “move” the properties across. No sale to an outsider, no money changes hands surely there can’t be tax?
Unfortunately, legislation can create a disposal where no cheque exists. HMRC states a transfer to a connected company may be charged SDLT by reference to market value rather than the amount paid. CGT needs considering too, though limited reliefs including incorporation relief for qualifying businesses may alter the result. Model the entry taxes first; see HMRC’s guidance on Incorporation Relief.
Selling Through a Limited Company
If a limited company owns the buy-to-let property, the gain is normally dealt with within Corporation Tax rather than the individual residential-property CGT system, and extracting the sale proceeds personally raises a second tax question of its own.
This matters increasingly because so many landlords have bought through companies in recent years. “What’s the tax on selling my rental property?” has to begin with a more basic question: who actually owns it?
Don’t Forget the Mortgage
The mortgage doesn’t reduce your CGT gain, but it’s very relevant to how much cash you receive, so a heavily mortgaged or refinanced buy-to-let property can leave a tax bill that represents a much larger share of your net proceeds than expected.
Suppose you sell for £400,000 and your remaining mortgage is £280,000. The conveyancer repays that loan, leaving £120,000 before selling costs then a substantial CGT bill becomes payable on the full gain, not on the £120,000 you actually banked.
This matters most where properties were heavily refinanced: capital released through remortgaging is not the same as increasing your tax base cost.
Should You Sell Your Buy-to-Let Property at All?
Tax is only part of the decision weigh it alongside nets rental yield, capital tied up, borrowing costs, maintenance, management time, likely future returns, your age, retirement plans and concentration risk.
We wouldn’t generally advise retaining a bad investment merely because selling creates CGT. Equally, we wouldn’t sell a perfectly good buy-to-let property solely because this year’s tax rules are irritating.
Sentiment reflects this tension: Simply Business’s 2025 Landlord Report found 36% of landlords planned to sell within 12 months, citing regulatory pressure, the shrinking Annual Exempt Amount and the incoming 2027 property income tax changes. CGT is one cost of exiting it isn’t the entire investment decision.
A Practical Checklist Before Putting Your Buy-to-Let Property on the Market
Before marketing a buy-to-let property, gather your completion statement, purchase contract, SDLT records, improvement records, occupation history, ownership percentages, available losses and an estimate of current-year income then run an indicative CGT calculation before you exchange.
- Original completion statement.
- Purchase contract and price.
- SDLT records.
- Original legal and survey costs.
- Records of capital improvements.
- Periods you genuinely occupied it as your main home.
- Current ownership percentages.
- Available capital losses.
- An estimate of current-year taxable income.
- Expected estate-agent and legal costs.
Run an indicative CGT calculation before exchange not 58 days after completion while wondering why HMRC’s website wants a number you haven’t worked out.
The Tax on Sale Was Often Determined Years Ago
This is the uncomfortable truth about Capital Gains Tax on a buy-to-let property: a large part of the final bill is determined by decisions made long before the sale.
Who bought it. What it cost. Whether you lived in it. What improvements you made. Whether you kept the receipts. How ownership was structured. Whether losses exist. And when you eventually dispose of it.
There may still be planning available shortly before a sale, but options narrow as the transaction progresses. By the time contracts have exchanged, most of the useful levers have already disappeared.
HMRC’s data underlines the scale involved: Capital Gains Tax raised £13.3 billion across the UK in 2024/25, according to the House of Commons Library’s briefing on Capital Gains Tax: recent developments.
Thinking of Selling a Buy-to-Let? Speak to Us Before Exchange
At Carter Collins & Myer, we advise landlords across Rochdale, Greater Manchester, Lancashire and Cheshire on property tax planning, Capital Gains Tax and wider portfolio strategy. If you’re considering selling a rental property, we can calculate the likely gain before you commit, identify reliefs and losses, consider ownership and timing, and tell you how much cash to reserve for tax.
That’s something useful before agreeing the deal: the amount you’re actually going to walk away with. The sale price is interesting. The net figure after mortgage, costs and tax is the one that matters.
This article provides general information about UK taxation and should not be treated as advice for a particular disposal. Property CGT depends on ownership history, residence, expenditure, losses and individual circumstances.