Getting married does not automatically make one spouse legally responsible for every credit card, student loan, or personal loan the other spouse brought into the relationship. But once the couple applies for a mortgage together, those old balances can suddenly become part of the lender’s calculation.
That matters because legal responsibility and mortgage responsibility are not the same thing. A spouse can remain legally separate from a debt while that debt still affects a joint mortgage application through monthly payments, credit history, or both. The state where the couple lives can add another layer, especially in community property states.