When documenting a loan where repayment is overdue, choosing the correct agreement title is crucial. Options like 'Agreement', 'Agreement for Loan', or 'Simple Agreement' are suggested. However, a 'Promissory Note' is often recommended as it clearly outlines the borrower's promise to repay and can be more legally robust. Taking post-dated cheques is also advised as a strong alternative, offering a simpler recovery process in case of default compared to a loan agreement or promissory note.