If this is not taxable income, then you don't need to do anything.
Banks have a requirement to report large transfers, this will happen automatically and has nothing to do with you.
However, if you have your borrower make several smaller payments under $10,000 instead of one large payment so you can avoid the reporting requirements, be aware that this can constitute a financial crime called "structuring" even if the overall purpose of the transfers is completely legal. So don't mess around or get tricky, just let the borrower write a check or do a wire transfer or pay you in cash or do whatever else is convenient for both of you.
