Owning a property jointly with a spouse, civil partner, family member or friend can be a smart way to share costs, build wealth and generate rental income. However, joint ownership also brings its own set of tax rules in the UK, and getting them right can make a real difference to the amount of tax you actually pay each year.

This guide explains how income tax, Capital Gains Tax (CGT) and Inheritance Tax (IHT) apply to jointly owned property in England and Wales, and walks through the practical steps you can take in the 2025/26 tax year to keep your bill as low as legally possible.

What is Joint Tenancy and Tenancy in Common?

In England and Wales, joint ownership of property generally falls into one of two legal forms: joint tenancy or tenancy in common. The form you choose affects how income is taxed, how the property passes on death, and what tax planning options are open to you.

The tax position can also vary from one tax year to the next, because the CGT annual exempt amount, income tax bands and reporting deadlines are set on a year by year basis. The figures used in this article reflect the 2025/26 tax year (6 April 2025 to 5 April 2026).

Joint Tenancy

Under a joint tenancy, both owners are treated as holding an equal share in the whole property, with equal rights to use it and to any income it produces. If one owner dies, their interest passes automatically to the surviving joint tenant under the right of survivorship, regardless of what the will says.

For tax purposes, each owner is treated as having an equal share in the property and in its income. For example, if you and your partner own a property together as joint tenants and the property generates £5,000 of rental profit a year, each of you is taxed on £2,500. When the property is sold, each owner is treated as receiving half of the gain. Your share of that gain is then taxed at the residential property CGT rates that apply to your overall income, which is 18% within the basic rate band and 24% above it for 2025/26.

Tenancy in Common

Tenants in common can hold the property in any agreed proportions, such as 60/40 or 70/30, rather than 50/50. Each owner has a distinct share that can be left by will to whoever they choose, so the property does not automatically pass to the other owner on death.

For most joint owners who are not married or in a civil partnership, the income and gains are taxed in line with the actual beneficial ownership shares. So if you own 40% and your partner owns 60%, that is the split HMRC will expect you to use on your tax returns.

For married couples and civil partners, however, a special rule applies. By default, HMRC treats the rental income as if it were split 50/50, even if the underlying ownership is unequal. This default can only be changed in specific circumstances, which is where Form 17 comes in.

Is it Possible to Change the Default 50/50 Split?

Yes, but only for married couples and civil partners, and only where the property is held as tenants in common in unequal beneficial shares. You change the default by submitting Form 17, the formal declaration of beneficial interests in joint property and income, to HMRC.

Form 17 can be used where all of the following are true:

• You are married or in a civil partnership and living together
• You hold the property as tenants in common, not as beneficial joint tenants
• You hold the property in genuinely unequal beneficial shares, such as 75/25 or 90/10
• You want the rental income to be taxed in line with those actual shares rather than 50/50

You can download Form 17 from GOV.UK. The declaration must be signed by both spouses or civil partners and must reach HMRC within 60 days of the date the last person signed. HMRC enforces this 60 day deadline strictly, and a late form is treated as invalid. The declaration takes effect from the date of signing and cannot be backdated to cover earlier periods.

You also cannot simply pick a tax efficient split out of thin air. The shares declared on Form 17 must reflect the actual beneficial ownership of the property, and HMRC will normally expect to see supporting evidence such as a deed of trust. If you declared a 10/90 income split when you were really the 100% beneficial owner of the property, the election would be rejected.

If you do submit a valid Form 17, you will also need to report the new income split correctly through your Self Assessment tax returns from that point onwards.

Is it Possible to Change the Election on Form 17 More Than Once?

There is no fixed limit on how many times a couple can change their Form 17 declaration, but each new declaration has to reflect a real change in beneficial ownership. You cannot simply re submit Form 17 with different percentages while continuing to own the property in the same shares.

A valid Form 17 stays in force until one of the following happens:

• The beneficial interests in the property change
• One spouse or civil partner dies
• The couple permanently separate or divorce

Even a small change in beneficial ownership ends the existing declaration and the default 50/50 rule kicks back in unless a fresh Form 17 is submitted. Restructuring your shares too often can also have knock on consequences. Each transfer of beneficial interest is a disposal for CGT purposes, although transfers between spouses and civil partners who are living together usually take place on a no gain, no loss basis. Any future changes in market value will, however, affect the base cost the receiving spouse takes on for their later disposal.

How is Tax Calculated for Joint Owners Other Than Married Couples?

For unmarried joint owners, including friends, business partners, parents and children, or unmarried cohabiting partners, the 50/50 rule does not apply. Each owner is taxed on their actual share of the rental profits, in line with their beneficial ownership.

So if two friends jointly own a buy to let property and the agreed split of profits is 90/10, each will report their actual share on their Self Assessment return. Form 17 is not relevant in this case because it is only available to spouses and civil partners. It is still sensible to keep clear records of how income is shared, including a deed of trust if the legal title and the underlying beneficial interest do not match, plus separate bank accounts or properly documented transfers showing how rent is actually distributed.

Beneficial ownership and income split can be a confusing pair of ideas. Beneficial ownership describes who really owns the property and is entitled to its capital and income. The income split should normally follow that beneficial ownership. If you want to change the underlying beneficial ownership later, the transfer is treated as a part disposal of the property for CGT purposes. Where the transfer is between spouses or civil partners living together, this is normally on a no gain, no loss basis. Where it is between unmarried owners, a chargeable gain can arise on the value transferred. For more on this area, see our guide to Capital Gains Tax planning.

How to Save Tax by Transferring Beneficial Ownership Before a Sale

Now that we have looked at how beneficial ownership can be changed, the next question is how to use this in practice to save tax on a sale. A common strategy is to transfer some of the beneficial interest in a property to a spouse or civil partner before the property is sold, so that both annual exempt amounts and both sets of basic rate bands can be used against the gain.

This works because of three key rules in the 2025/26 tax year:

• Each individual has their own CGT annual exempt amount of £3,000
• Residential property gains falling within the basic rate band are taxed at 18%, with anything above taxed at 24%
• Transfers between spouses and civil partners who are living together are treated as no gain, no loss disposals, so no CGT arises on the transfer itself

By moving part of the property into the name of a spouse or civil partner who has unused basic rate band or has not used their annual exempt amount, the couple can reduce the overall CGT liability on the eventual sale. Private Residence Relief should also be checked carefully. If the property has been your only or main home throughout your ownership, the gain may be fully relieved and the planning above is unnecessary. The relief is mainly relevant for buy to let properties, second homes and properties that have only been occupied as a main home for part of the period of ownership. The final 9 months of ownership of a former main residence still qualify for relief in 2025/26.

The transferee, the person receiving the share, must genuinely become entitled to the proceeds of sale. If the transfer is on paper only and one spouse keeps all of the money, HMRC can challenge the planning. The transfer also needs to take place before the property is put on the market or otherwise effectively committed to a buyer. Once a deal is in motion, HMRC may argue that the transfer was made too late to shift the gain.

For UK residential property, remember that any CGT due on a disposal must be reported and paid through HMRC’s UK Property Reporting Service within 60 days of completion, separately from your Self Assessment return.

Wrapping Up

A bit of planning around joint ownership can significantly reduce the tax payable on rental income, gains and inherited property value. The key points to take away are that the legal form of ownership matters, that married couples and civil partners are subject to special rules including the 50/50 default and the Form 17 election, and that the 2025/26 figures, particularly the £3,000 CGT annual exempt amount, leave less margin for error than in earlier years.

Because the rules interact across income tax, CGT, IHT and Stamp Duty Land Tax, it is well worth getting tailored advice before making any changes to ownership or before selling a jointly owned property. For a free initial consultation, call us on 03300 575 902.

Frequently Asked Questions

What are the tax implications of owning a property jointly?

Owning a property jointly can affect income tax on rental profits, CGT on a future sale, IHT on death, and Stamp Duty Land Tax if shares are transferred for consideration. The exact treatment depends on whether the owners are married or in a civil partnership, how the property is held, and how the income and gains are actually shared.

Are there any tax benefits to owning a property jointly?

Yes. Joint ownership can allow rental income to be split between two taxpayers, so more of the profit may fall within lower income tax bands. Each owner also has their own CGT annual exempt amount of £3,000 in 2025/26 and their own basic rate band for the 18% residential property CGT rate, which can reduce the tax on a future sale.

How can I save tax on rental income from a jointly owned property?

You can review how the rental income is allocated between the joint owners. Married couples and civil partners holding the property as tenants in common in unequal shares can submit Form 17 so that the income is taxed in line with their actual shares rather than 50/50. Unmarried owners are taxed on their actual beneficial shares already, so the focus is more on choosing the right ownership split at the outset and claiming all allowable expenses.

What are the Capital Gains Tax implications when selling a jointly owned property?

Each owner is taxed on their share of the gain in line with their beneficial ownership. For 2025/26, residential property gains are taxed at 18% in the basic rate band and 24% above it, after deducting each owner’s £3,000 annual exempt amount and any allowable losses. UK residential property disposals must be reported and the tax paid within 60 days of completion through HMRC’s online UK Property Reporting Service.

Can I claim tax deductions for jointly owned property expenses?

Yes. Allowable expenses such as letting agent fees, repairs and maintenance, insurance, ground rent and the cost of replacing domestic items can be deducted from the rental income before tax. Mortgage interest on residential let property is no longer deducted as an expense for individual landlords. Instead, basic rate tax relief is given as a tax reduction at 20%. Each joint owner deducts their share of the expenses against their share of the income.

What tax planning strategies are available for jointly owned properties?

Common strategies include choosing the right legal structure between joint tenancy and tenancy in common, allocating beneficial shares to the lower income spouse or civil partner where appropriate, using Form 17 where the law allows, holding property through a limited company or family investment company in some cases, and reviewing wills, trusts and lifetime gifts to manage the IHT position.

How can I minimise Inheritance Tax on a jointly owned property?

Sensible IHT planning often involves making full use of the spouse exemption, the £325,000 nil rate band and, where the property is being passed to direct descendants, the £175,000 residence nil rate band. Lifetime gifts, the seven year rule and the careful use of trusts can also reduce the eventual IHT bill. Our Inheritance Tax Planning team can review your specific position and recommend the most efficient route.

What are the tax implications of renting out a jointly owned property?

Each owner must report their share of the rental profit through Self Assessment and pay income tax at their own marginal rate. Married couples and civil partners are taxed 50/50 by default unless a valid Form 17 election is in place. Landlords must also keep proper records, follow Making Tax Digital requirements as they are rolled out, and comply with mortgage interest restriction rules where relevant.

Can I transfer ownership of a jointly owned property to save tax?

Yes, but each transfer needs to be considered carefully. Transfers between spouses or civil partners living together are usually no gain, no loss for CGT, but transfers to other people can crystallise a chargeable gain. Stamp Duty Land Tax can also apply where the person receiving the share takes on a portion of the outstanding mortgage that exceeds the relevant SDLT threshold. The wills, lender consent and any future divorce or family arrangements should all be reviewed before going ahead.

How can I make sure I am compliant with the tax rules for jointly owned properties?

Keep clear records of ownership, income and expenses, file Self Assessment returns on time, report and pay any CGT on UK residential property within 60 days of completion, and make sure that any Form 17 declaration is properly evidenced and submitted within 60 days of signing. Speaking to a specialist property tax adviser can help you stay on the right side of HMRC and identify planning opportunities you might otherwise miss.