The ‘Daily subsistence allowance’ is one of the benefits paid to new staff members of EU institutions if they have had to relocate and settle in to the new ‘place of work’ within their own country or to a different EU Member State.
The Daily subsistence allowance or DSA is higher and is paid for a longer period if the staff member is married/in a registered partnership or has dependent children. Article on the Daily subsistence allowance.
Official cohabitation counts as family and entitles you to the allowance. In case it’s relevant to anyone, same sex couples…