Hi,
To split the rental income in unequal share, both parties must have a beneficial interest in the ownership of the property.
This must be done by redigesting both parties on the property Deeds and to submit a Deed of Trust signed and witnessed accordingly to HMRC.
As regards the expenses question, the expenses incurred in maintenance of the property will share equally in accordance with the split of unequal shares.
Therefore, if the property income is split 10/90, the expense with be treated the same way.
Furthermore, if the property is held under joint ownership of husband and wife, Form 17 must be completed.
Further information can be found on our website
PIM1030 - Introduction: jointly owned property & partnerships
Thank you.