As couples make their claim jointly they have, by implication, given consent to HMRC to discuss the contents of their claim form with either party. This means we can discuss all the information on the form with either or both claimants even if the information relates to the other claimant.
We can also disclose to either or both claimants:
Where you are looking into changes in SA income which have
implications for the tax credits entitlement, you may need to
discuss with or disclose to one or both claimants information which
relates to the SA liability of the other person.
If the changes arise because of an SA enquiry, you must be
careful only to discuss or disclose the results of that enquiry
(i.e. the revised SA income figure) with or to the other claimant.
You must not discuss or disclose the details of the SA enquiry
(e.g. the reasons why the income was increased) with or to the
other claimant.