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HMRC internal manual

Trusts, Settlements and Estates Manual

HM Revenue & Customs
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Property held jointly by married couples or civil partners: Form 17 rule: Who can make a declaration?

A form 17 declaration (ITA/S837) to opt for an unequal split of income for tax purposes applies only to property that would otherwise be subject to the 50/50 rule (ITA/S836).

A married couple or civil partners who have separated would not be subject to the 50/50 rule, as it applies only to couples living together (TSEM9810). They will be taxed on their actual entitlement in any event, and so cannot make a form 17 declaration.

Individuals other than spouses or civil partners cannot make a form 17 declaration, for example siblings. The 50/50 rule does not apply to them. Income is attributable to them on the basis of their entitlement.