What happens if you co-signed for someone’s debt and want to buy a home? Depending on the financing, you must show at least a 12-month history of someone else paying the debt on time. Otherwise, the lender will count it as your debt. If you would like the “What to Consider Before Co-Signing a Loan” tip sheet, comment below, and I’ll send it to you. If you already co-signed for another person’s loan, let’s talk about your situation and structure a plan.