Example 1: One rent payment, two incomes, three cards
Mia pays the $1,850 rent from her checking account on the 1st, Jordan covers a $126 electric bill on the 5th, and groceries land across two credit cards during the month. A combined view lets them see the $2,400 shared spend total without pretending every charge belongs to both people equally.
They can settle once per week instead of reconciling line by line on the last day of the month.
