Informal Loan Agreement

What this document is

An informal loan agreement is the shortest useful version of a loan contract: the names, the amount, the date the money was handed over, and the date it comes back. It exists for the wide territory between trivial amounts nobody documents and serious loans that deserve a full agreement — the ฿10,000 to a neighbor, the month's rent covered for a cousin's roommate, the advance to a longtime housekeeper.

Informal does not mean unwritten. The whole point is to capture the handshake deal on paper while it is fresh, in language both people can read in under a minute. If the loan later grows, changes, or goes wrong, this simple page can be upgraded — into a fuller personal loan agreement, a repayment plan, or a debt acknowledgment — but even on its own it beats memory every time.

When to use it

• The amount is modest and the relationship is trusted, but you would still be annoyed to lose the money.
• You want something signed today, in minutes, without discussing default clauses and guarantors.
• You lend occasionally to the same person — a relative, an employee, a neighbor — and want a consistent, lightweight record each time.
• A verbal loan already exists and you want the basics on paper without making it a bigger deal than it is.
• You are lending cash and need at least a signed record that the handover happened.

When not to use it

• The amount is large or repayment stretches over many months — use the full personal loan agreement so interest, late payments, and default are covered.
• You want to charge meaningful interest — rate calculations and legal caps deserve the longer document.
• There is already tension about repayment — at that point you need a debt acknowledgment and a structured repayment plan, not a casual record.

Information you will need

• Full names of the lender and borrower (add ID numbers if you can)
• Amount lent, in figures and words
• Date and method of the handover — a transfer reference, or 'cash, in person'
• The single repayment date, or a simple 'by' deadline
• Whether the loan is interest-free (informal loans usually are)
• Where repayment should be sent
• Signatures and the signing date

Clauses included

How to sign it

Both people sign and date the page, and each keeps a copy — for a document this short, a photo on both phones is a perfectly practical second copy. Sign before the money moves if you can; if the loan already happened, sign as soon as possible and note the original handover date.

If the loan is in cash, the signed page doubles as your proof of handover — add a line like 'received in cash on this date' above the borrower's signature. For transfers, put the transfer reference or date in the document so the bank record and the paper match.

Common mistakes

• Making it so informal that essentials go missing — a record without an amount in words or a due date leaves the two most disputed points open.
• Assuming a small document means small care with names. 'Uncle Beer' is not a party to a contract; write full legal names.
• Never upgrading. When a casual loan has been extended twice and partially repaid in cash, the one-pager no longer reflects reality — replace it with a repayment plan or an amended agreement.
• Handing over cash with no receipt and no signature on the same day, planning to 'write it up later'. Later rarely comes.
• Using the informal format for someone you barely know. The lighter document is for trusted relationships; with strangers, formality is protection.

Frequently asked questions