Selling a property you own with someone else raises questions that do not come up in a straightforward solo disposal. Who pays what? How is the gain divided? What reliefs are available to each owner? If you are a landlord, a married couple, or a property investor sharing ownership with a business partner, understanding how Capital Gains Tax (CGT) applies to jointly owned property is essential before you sell.
This guide covers everything you need to know, from how gains are split between owners to the reliefs available and the deadlines you must meet.
What Is Capital Gains Tax on Property?
Capital Gains Tax is a tax charged on the profit you make when you sell or dispose of an asset that has increased in value. For UK residential property, the gain is calculated by subtracting the original purchase price, the costs of buying, any allowable improvement costs, and the costs of selling from the final sale proceeds.
It is not a tax on the full sale price; it is a tax on the profit only. Each co-owner is responsible for reporting and paying their own share of CGT. There is no joint CGT return.
Who Pays Capital Gains Tax on Jointly Owned Property?
When a jointly owned property is sold, liability falls on the beneficial owner of the property, not simply the legal owner on the title deeds. The beneficial owner is the person who actually benefits from the asset financially.
In most cases, HMRC assumes that co-owners hold the property in equal shares, so a 50/50 split is the default position. Each owner is therefore assessed on 50% of the total chargeable gain. However, this default can be overridden where owners can demonstrate that their beneficial interests differ from equal shares, for example through a deed of trust or a Form 17 declaration.
Joint Tenants vs Tenants in Common: Does It Make a Difference?
The way you legally hold the property directly affects how CGT is calculated.
Joint tenants collectively own the whole property without defined individual shares. For CGT purposes, joint tenants are treated as owning equal portions. With two joint tenants, each is treated as owning 50%; with three, each is treated as owning one third. If one joint tenant dies, ownership passes automatically to the surviving owner or owners by right of survivorship.
Tenants in common each hold a defined, separate share that can be in any proportion agreed at purchase or subsequently changed. That share can also be left to any chosen beneficiary in a will. For CGT, each owner is taxed on their actual beneficial share of the gain, not an assumed equal portion.
One important distinction: while rental income from jointly held property defaults to a 50/50 income tax split regardless of ownership type, CGT follows the actual beneficial ownership. A married couple holding a buy-to-let as tenants in common in a 70/30 split will each be assessed on their respective 70% and 30% of the gain.
If you currently hold property as joint tenants and wish to reflect unequal contributions, you can sever the joint tenancy to convert to tenants in common. Severing a joint tenancy between spouses or civil partners does not itself trigger a CGT charge, but a deed of trust should be drawn up to record the agreed shares.
Changing the Ownership Split: Form 17 and Deeds of Trust
For married couples and civil partners, rental income from jointly owned property is taxed on a default 50/50 basis regardless of actual ownership proportions. If you wish to be taxed according to your actual unequal shares, you must file a Form 17 declaration with HMRC. This is the only mechanism available to married couples and civil partners to change the income tax split from 50/50.
To make a valid Form 17 declaration, you must genuinely own the property in unequal shares supported by a deed of trust, both partners must sign the form, and it must reach HMRC within 60 days of the date the deed was signed.
For CGT purposes, however, married couples and civil partners are already assessed on their actual beneficial ownership shares, so Form 17 has no direct effect on CGT calculations. The beneficial interest in the property, as documented in a deed of trust, governs the CGT split.
Unmarried co-owners are not subject to the 50/50 income rule and can agree to share rental income in different proportions. They must document any profit-sharing arrangement clearly to avoid disputes. For CGT, unmarried co-owners are also assessed on their actual beneficial ownership share.
CGT Rates on Jointly Owned Property (2025/26 and 2026/27)
The CGT rate you pay depends on your total taxable income for the tax year. For the 2025/26 and 2026/27 tax years, the rates on residential property disposals are as follows:
| Taxpayer Band | CGT Rate on Residential Property |
|---|---|
| Basic rate taxpayer | 18% |
| Higher or additional rate taxpayer | 24% |
| Trustees and personal representatives | 24% |
A basic rate taxpayer pays 18% on gains that, when added to their taxable income, remain within the basic rate band of £37,700. Any portion of the gain that pushes total income above this threshold is taxed at 24%.
One of the most valuable benefits of joint ownership is that each co-owner receives their own annual exempt amount, currently £3,000 per person for 2025/26 and 2026/27. On a jointly owned disposal this means up to £6,000 of the total gain is sheltered from CGT in aggregate, provided neither owner has used their exemption against other gains in the same tax year.
How to Calculate CGT on a Jointly Owned Property
The starting point is the total gain on the property, calculated as the net sale proceeds minus the original purchase cost and any allowable expenses. This total gain is then divided between the co-owners in line with their respective beneficial ownership shares. Each owner applies their own annual exempt amount and calculates their CGT liability using their own applicable tax rate.
Here is a straightforward illustration. Mr and Mrs Ahmed jointly own a buy-to-let property. They sell it for £500,000. The original purchase price was £300,000 and allowable costs total £10,000, producing a total gain of £190,000. They hold the property as tenants in common with Mr Ahmed owning 40% and Mrs Ahmed owning 60%.
| Particulars | Mr Ahmed (40%) | Mrs Ahmed (60%) |
|---|---|---|
| Share of gain | £76,000 | £114,000 |
| Less: annual exempt amount | (£3,000) | (£3,000) |
| Taxable gain | £73,000 | £111,000 |
Each owner then applies the 18% or 24% rate based on their own taxable income for the year. Where one spouse is a basic rate taxpayer and the other is a higher rate taxpayer, holding a greater share in the lower rate owner’s name reduces the overall household tax liability.
Private Residence Relief on Jointly Owned Property
Private Residence Relief (PRR) exempts all or part of the CGT gain on a property that has been your only or main residence throughout your period of ownership. The relief also covers the final nine months of ownership automatically, even if the owner has already moved out before the sale.
Where a property is jointly owned, each co-owner’s PRR entitlement is assessed individually. This means two co-owners selling the same property can have very different CGT positions. A co-owner who lived in the property qualifies for full or partial PRR. A co-owner who never lived there receives none. PRR cannot be shared or transferred between co-owners.
A common scenario is a property one partner previously lived in before purchasing jointly. That partner qualifies for PRR covering the period of occupation plus the final nine months. The other, who never resided there, owes CGT on the full gain attributable to their share.
Married couples and civil partners face an additional constraint. From the point they live together, they can only have one nominated main residence between them. If each spouse owned a property before marriage, they have two years from the date of marriage to nominate which one qualifies. Missing this window means HMRC decides on the facts.
Lettings relief may further reduce the chargeable gain, but only where the owner continued to live in part of the property while letting out another part. It does not apply where a property was let out entirely after the owner moved out, which covers the majority of buy-to-let landlords.
CGT When One Co-Owner Is Non-Resident
When both co-owners are UK residents, CGT is calculated in the same way for each. Where one co-owner is non-resident, additional complexity arises.
Non-residents were not subject to CGT on UK residential property before 6 April 2015. They are therefore only liable on the gain arising since that date. UK residents, by contrast, are liable on the entire gain since original purchase. Non-residents must file a Non-Resident Capital Gains Tax (NRCGT) return rather than the standard CGT return. Both returns must be filed within 60 days of the completion date.
The 60-Day Reporting Deadline
From 27 October 2021 onwards, any CGT arising on the disposal of UK residential property must be reported and paid to HMRC within 60 days of the completion date, not the exchange of contracts. This applies to each co-owner individually. Failure to report and pay within the deadline can result in penalties and interest charges.
UK residents who have no CGT to pay, because their gain is fully covered by reliefs or the annual exempt amount, are not required to report online. However, non-residents must file a return regardless of whether any tax is payable. Gains must also be included in any annual Self Assessment tax return where one is required.
Reducing CGT on a Jointly Owned Property
There are legitimate steps that co-owners can take to reduce their combined CGT exposure before a sale.
For spouses and civil partners, transferring a share of the property before the sale is one of the most effective strategies. A spousal transfer is treated as a no-gain, no-loss transaction and does not itself trigger CGT. The recipient takes on the transferring spouse’s original base cost. Any such transfer must be genuine, documented through a deed of trust, and completed before exchange of contracts, as the CGT position is fixed once contracts are exchanged.
For unmarried co-owners, a transfer of a share is treated as a disposal at market value and may itself trigger a CGT liability. Professional advice should always be sought before making changes to ownership structure ahead of a sale.
Other strategies include using both owners’ annual exempt amounts, timing the disposal to fall in a tax year when one owner has lower income and pays at 18% rather than 24%, and claiming all available reliefs such as PRR and allowable improvement costs.
How UK Property Tax Accountants Can Help
Managing Capital Gains Tax on a jointly owned property involves multiple overlapping rules covering beneficial ownership, ownership type, individual tax rates, available reliefs, and strict reporting deadlines. Getting any of these wrong can lead to an overpaid or underpaid tax liability, or penalty charges from HMRC.
UK Property Tax Accountants specialises in CGT exactly for these situations. Our team of experts helps co-owners in the following ways:
- Ownership structure review: We assess whether your current joint tenancy or tenancy in common arrangement is optimised for CGT before you sell.
- Pre-sale planning: We advise married couples on transferring beneficial ownership shares prior to sale to minimise total household CGT liability.
- Form 17 and deed of trust preparation: We assist in preparing and filing Form 17 declarations and deeds of trust to ensure your ownership split is correctly reflected for both income tax and CGT purposes.
- CGT calculation and relief optimisation: We compute the gain for each co-owner, apply all available reliefs including PRR, and identify any allowable costs that reduce the taxable gain.
- 60-day reporting: We handle the online CGT reporting obligation on your behalf, ensuring returns are filed accurately and on time to avoid penalties and interest.
- Non-resident co-owners: We prepare NRCGT returns and coordinate the filing process for mixed-residence co-ownership situations.
Whether you are planning a sale, have already exchanged contracts, or want to restructure ownership before either event, our team provides clear and practical advice tailored to your specific circumstances.
Frequently Asked Questions
Do both co-owners need to file separate CGT returns?
Yes. Each co-owner is assessed to CGT individually on their own share of the gain. There is no joint CGT return. Each co-owner must report and pay their own liability, typically within 60 days of the completion date.
Can each co-owner use their own annual exempt amount?
Yes. Each co-owner receives their own annual exempt amount of £3,000 for 2025/26. On a jointly owned disposal, up to £6,000 of the total gain can therefore be sheltered from CGT in aggregate, provided neither owner has used their exemption against other gains in the same tax year.
Does it matter whether we own as joint tenants or tenants in common for CGT purposes?
Yes. Joint tenants are treated as owning equal shares for CGT regardless of actual contributions. Tenants in common are assessed on their actual beneficial ownership share. Holding property as tenants in common in proportions that reflect each owner’s tax position can produce a lower combined CGT bill.
Can spouses transfer ownership shares before a sale to reduce CGT?
Yes. Transfers between spouses and civil partners are treated as no-gain, no-loss transactions and do not themselves trigger CGT. The transfer must be genuine, documented through a deed of trust, and completed before exchange of contracts. Unmarried co-owners do not benefit from this treatment.
What happens to CGT if a co-owner dies before the property is sold?
The deceased co-owner’s share passes to their estate. Where the property is held as joint tenants, it passes automatically to the surviving owner. The surviving owner inherits the deceased’s share at its market value at the date of death, which becomes the new base cost for any future disposal.
What is Private Residence Relief and can both co-owners claim it?
Private Residence Relief exempts CGT on gains from a property that has been an owner’s only or main residence. Each co-owner’s entitlement is assessed individually. One co-owner can qualify for full relief while the other receives none if only one of them ever lived in the property.
