How does Making Tax Digital work on a jointly owned property?

Your share of the income counts towards your qualifying income, not the whole rent.

A property let for £50,000 a year and owned equally by two people gives each of them £25,000 of qualifying income. With no other self employment or property income, neither is over the £50,000 threshold.

That works the other way too. Several small shares still add up, and they are added to any self employment turnover before the threshold is tested.

It is the ownership share that matters rather than who collects the rent or whose account it lands in. Worked examples are on gov.uk.