Income from Jointly Owned Property: UK Tax Rules for Co-owners

How you tax the income from a jointly owned property depends entirely on the relationship between the co-owners. While unmarried joint owners are taxed according to their actual share of ownership, HMRC applies a special default rule for married couples and civil partners, treating them as entitled to the income in equal shares.

This guide explains the different tax treatments for income from jointly owned property and clarifies how married couples can opt out of the default position.

The Default Rules for Splitting Income

The correct method for allocating rental profits or other property income depends on whether the joint owners are married or in a civil partnership.

1. Married Couples and Civil Partners: The 50/50 Rule

Section 836 of the Income Tax Act 2007 (ITA 2007) establishes a default 50/50 income split for property held in the joint names of spouses or civil partners. So, this rule applies automatically for income tax purposes, even if the couple owns the property in unequal shares (for example, 90/10).

The term ‘property’ is wide-ranging and includes land, buildings, savings accounts, and shares. The key requirement is that the asset must be held in the couple’s joint names for the rule to apply. If an asset is in the sole name of one spouse, section 836 does not apply, and that individual is taxed on all the income.

2. Unmarried Joint Owners

The 50/50 rule does not apply to individuals who are not married or in a civil partnership, such as siblings, friends, or cohabiting partners. Well, these individuals are taxed on the income based on their actual beneficial entitlement to the property. Ultimately, this is usually determined by their respective shares in the property’s ownership.

Understanding the Type of Joint Ownership

To determine beneficial entitlement, it is crucial to understand the two main forms of joint ownership in England and Wales.

• Joint Tenants: The owners are jointly entitled to the whole of the property, with no distinct shares. If one owner dies, their interest automatically passes to the surviving owner(s). This is the most common form of ownership for married couples. Thus, when property is held in joint names, the law presumes a joint tenancy unless there is evidence to the contrary.
• Tenants in Common: Each owner holds a specific, identifiable share in the property (e.g., 60% and 40%). Furthermore, these shares are distinct and can be passed on via a will. Also, this form of ownership is necessary if a couple wishes to declare unequal interests to HMRC.

Overriding the 50/50 Rule: The Form 17 Declaration

Married couples and civil partners can choose to be taxed on their actual beneficial interests if they differ from a 50/50 split. They achieve this by making a joint declaration to HMRC using Form 17. Yes, this declaration overrides the default rule in section 836 ITA 2007.

To make a valid Form 17 declaration, you must satisfy several strict conditions:

1. Ownership Must be as Tenants in Common: A declaration can only be made if the couple owns the property as tenants in common in unequal shares. It is not possible if they are beneficial joint tenants, as they do not own the property in distinct shares.
2. The Declaration Must Reflect Reality: The income split declared must be the same as the split in the underlying beneficial ownership of the property. Couples cannot simply choose a tax-efficient split; it must be legally and factually correct.
3. The Declaration Must be Joint: Both spouses or civil partners must sign the Form 17. If one party does not agree, the 50/50 rule remains in effect.
4. Strict 60-Day Time Limit: The signed Form 17 must be submitted to HMRC within 60 days of the date the last partner signed it. There is no power for HMRC to extend this time limit.

A declaration applies only to the assets listed on the form and takes effect for income arising on or after the date of signing. It remains valid until the couple’s beneficial interests in the property change, or they cease to live together as a married couple or civil partners.

Exceptions to the 50/50 Rule

Certain types of jointly held property are specifically excluded from the 50/50 rule, meaning the income is taxed on actual entitlement without needing a Form 17 declaration. So, these include:

• Income from a partnership business.
• Income from the commercial letting of Furnished Holiday Lettings (prior to the FHL regime’s abolition in April 2025).
• Dividend income from shares held in a close company.
• Income from property where neither spouse is beneficially entitled (e.g., they hold it as trustees).

Summary of Income Allocation Rules

For detailed guidance on beneficial ownership and the application of the 50/50 rule, refer to HMRC’s Trusts, Settlements and Estates Manual at TSEM9800 onwards.