Interest-Free Loan Agreement

What this document is

'Just pay me back the same amount' sounds too simple to need paperwork — and that is exactly why interest-free loans cause disputes. With no interest to negotiate, people skip the document entirely, and the loan drifts: the amount blurs across several transfers, the deadline was never fixed, and one side quietly starts treating the money as a gift. An interest-free loan agreement fixes the two things that still matter enormously: exactly how much goes back, and by when.

The document also does one job no verbal deal can: it states in writing that the money is a loan and that the interest rate is zero on purpose. That single page protects the lender's principal, protects the borrower from any later claim that interest was owed, and — for loans between relatives — draws a clean line between a loan and a gift, which can matter to the wider family and, in some countries, to the tax office.

When to use it

• You are lending to family or a close friend and charging interest feels wrong, but the amount is too large to leave undocumented.
• You want it in black and white that no interest will ever be added, however long repayment takes.
• You are the borrower and want proof that the lender agreed to zero interest.
• An employer is giving a staff member an interest-free salary advance beyond a trivial amount.
• Money was lent interest-free some time ago and you both want the terms finally written down.

When not to use it

• You actually want interest, now or later — use the full personal loan agreement, where the rate and calculation are handled properly.
• The money is meant as a gift — write a signed gift letter instead, so the record matches the intention.
• The 'interest-free' loan comes with informal strings attached, like a share of a business or unpaid work — those arrangements need honest documentation of their own, and often professional advice.

Information you will need

• Full legal names and ID details of the lender and borrower
• Loan amount in figures and words, plus the currency
• Date and method of the handover — bank transfer, PromptPay, or cash
• The repayment schedule or single repayment date
• An explicit statement that the interest rate is zero
• Whether anything changes if repayment runs very late — some lenders agree interest starts only after default
• Where repayments should be sent

Clauses included

How to sign it

Sign before the money moves, with each side keeping a copy. Because the document's core promise is 'the same amount comes back', double-check the amount is written in both figures and words — with no interest calculations to anchor it, the principal figure is the whole deal.

Transfer rather than hand over cash where you can, and reference the agreement in the transfer note. If part of the loan already happened earlier, list each earlier transfer with its date so the total in the agreement matches the bank records exactly.

Common mistakes

• Leaving the zero-interest promise verbal while documenting everything else — the borrower's copy should show the same 'no interest' promise the lender remembers making.
• Confusing interest-free with deadline-free. The rate is zero; the repayment date still needs to be real.
• Not stating that the money is a loan at all, leaving room for the 'it was a gift' argument years later.
• Lending interest-free over many years without acknowledging inflation — a fine and generous choice, but make it consciously, not by accident.
• Assuming zero interest means zero tax questions. In some countries, large interest-free loans between individuals can still have tax or reporting angles — worth checking for big sums.

Frequently asked questions