MTD for jointly-owned property: who reports what

Huge numbers of UK rentals are owned jointly — by spouses, partners, siblings or friends. Making Tax Digital doesn't change the ownership rules, but it does mean each owner reports their own share, quarterly, in their own MTD account. Here's how the pieces fit.

The default splits

• Married couples / civil partners — income is automatically split 50/50 for tax, regardless of who actually owns what share, unless you formally elect otherwise.
• Everyone else (unmarried partners, siblings, friends) — income follows your actual beneficial ownership shares, e.g. 70/30 if that's how you bought it.

Changing the split: Form 17

Married couples who own in unequal shares can elect to be taxed on the real split instead of 50/50 by filing Form 17 with HMRC — with evidence of the unequal beneficial ownership (usually a declaration of trust). It only works in that direction: you can't invent a split that doesn't match reality, and it applies from the date of the declaration, not retrospectively. This is a common (legitimate) planning tool when one spouse pays a lower tax rate.

What each owner reports under MTD

• Each owner counts their share of gross rents toward their own qualifying-income threshold (£50k now, £30k from April 2027, £20k from 2028). A £40,000-rent property owned 50/50 puts £20,000 on each owner's clock — which matters for the 2028 wave.
• Each owner keeps digital records and sends quarterly updates for their share of income and expenses.
• One owner being exempt (or below threshold) doesn't exempt the other.

The practical problem — and the fix

The full rent lands in one bank account, but you must report your percentage. Doing the arithmetic on every transaction, every quarter, is exactly the kind of error-prone chore MTD was supposed to end. MTDFox handles it natively: set your ownership share on the property (say 50%), record the full amounts from your bank statement, and every quarterly figure, report and tax estimate automatically shows your share only. Your co-owner runs their own account the same way.

Watch-outs

• Both owners should claim expenses in the same proportion as income.
• Transferring shares between spouses is CGT-free, but changing splits with anyone else can trigger CGT and SDLT — take advice before restructuring.
• Keep the declaration of trust and Form 17 with your records; HMRC can ask for them years later.