Taking a joint loan often feels like a natural step when two people plan a life or a large purchase together. A couple buying their first flat, siblings pooling resources for a parent’s home renovation, or partners funding a small business may all sign as co-borrowers so the lender can count both incomes. The higher eligibility and shared repayment plan seem practical. The catch: once the papers are signed, the debt ties both names together in ways that can outlast the relationship, the house, or the original plan.