It's not common but it is acceptable. Just keep in mind, you MAY need to enforce the contract which means suing your relative.When borrowing money from or loaning money to family and friends, make sure that your loan agreement addresses all the basic terms. The IRS mandates that any loan between family members be made with a signed written agreement, a fixed repayment schedule, and a minimum interest rate. Clients interested in lending money to financially assist a family member should consider making an intrafamily loan. Here, we outline basic information. Use the fields to narrow your search and select the "Search for documents" button to see your results. When applying for an SBA 7(a) loan, you must complete SBA Form 1919. Read our complete guide on loan agreements between family members. Learn what to include, the tax implications, risks and alternatives.