Jointly Held Property
UK tax glossary · Last reviewed: April 2026
When a property is owned jointly by married couples or civil partners, HMRC assumes income is split equally 50/50, regardless of the actual ownership proportion. If your actual share differs, you can elect for a different split by submitting Form 17, which must reflect the true beneficial ownership.
For unmarried joint owners, income is split in line with actual ownership from the outset — no election is needed, but both parties must declare their share on their own Self Assessment returns.
Jointly held property is a useful tool for couples where one partner pays a lower tax rate. Transferring a larger share to the lower-earning spouse (and filing Form 17) can reduce the overall family tax bill, but a genuine transfer of beneficial ownership must take place.
Common questions
What is Form 17 and how do I submit it?
Form 17 (Declaration of beneficial interests in joint property and income) tells HMRC your actual ownership shares. It must be filed within 60 days of the declaration and accompanied by evidence such as a declaration of trust.
If I transfer property to my spouse, do I pay CGT?
Transfers between spouses in a marriage or civil partnership are made at no gain/no loss for CGT. The receiving spouse inherits the original cost, which matters if the property is later sold to a third party.
Related resources
TaxHelper provides general information based on published HMRC rates and guidance. It is not regulated financial or tax advice. For decisions involving significant sums, complex circumstances, or if you are unsure, speak to a qualified accountant or HMRC directly.