Lending to a friend in Thailand is usually done on trust and a LINE message, which works until it does not. A short written agreement keeps a good friendship from being tested by an unpaid loan.
Thai practice still rewards written evidence and a transfer record, even between friends — precisely because friends are the ones who feel awkward asking for proof later.
Governing law
A loan between friends in Thailand is governed by Thai law, including the interest ceiling for personal loans. Many loans between friends are interest-free or very low interest; if you do charge, keep it within the legal limit and write it down.
Witness guidance
Friends rarely use witnesses, and for small amounts that is fine. For a larger loan, a mutual friend as witness, or simply clear signatures on a short document, adds weight without making it feel like a business deal.
Evidence
A PromptPay or bank transfer is your friend here: it timestamps the loan and the amount automatically. Save the slip and the LINE conversation where the loan was agreed, and attach them to the signed note.
What this document is
Lending to a friend usually starts in a chat: 'Can I borrow 15k until end of next month?' You send the money by PromptPay in thirty seconds, and there the paperwork ends. A loan agreement between friends takes that same casual loan and gives it the one thing chat messages rarely contain — a specific amount, a specific date, and two signatures. It takes ten minutes and reads nothing like a bank contract.
The awkward truth about friend loans is that the lender carries all the discomfort. Asking for your own money back feels rude, so people wait, hint, and quietly resent. A signed one-pager flips that dynamic: the repayment date is a fact you both created together, so a reminder is just pointing at the calendar, not questioning the friendship.
This template is deliberately lighter than a formal personal loan agreement — friends rarely need default-interest mechanics or guarantors. It focuses on what friend loans actually stumble on: the exact amount (including any earlier small loans you want rolled in), a realistic repayment date, whether repayment comes at once or in parts, and how you will both keep track of what has been paid.
When to use it
- A friend asks to borrow more than pocket money — roughly ฿5,000 or $150 and up — and repayment is not immediate.
- You have already lent money over chat and want to fix the terms while things are still friendly.
- Several small loans to the same friend have piled up and neither of you is sure of the total anymore.
- You are borrowing from a friend and want them to feel safe saying yes.
- A group trip or shared purchase left one friend covering a large amount for another.
When not to use it
- Your friend wants the money to start a business with you — if you share profits, that is a partnership conversation and probably professional advice, not a loan template.
- The friend is borrowing to cover gambling losses or debts to informal lenders — paperwork will not fix the underlying risk, and you should think hard before lending at all.
- The amount is life-changing for you — for sums you cannot afford to lose, treat it like a formal loan with advice and security, or simply give a polite no.
- You are really splitting a shared expense rather than lending — a shared expense agreement fits better.
Information you will need
- Both friends' full legal names and ID numbers (nicknames can go in brackets, but legal names matter)
- The exact amount being lent — plus any earlier unpaid loans you both agree to include
- How the money is sent (PromptPay, bank transfer, cash) and on what date
- The repayment date, or the dates of each part-payment
- Whether any interest applies (between friends, usually none)
- The account repayments should be sent to
- What you both agree happens if the date is missed — for example, a new written date rather than silence
Clauses included
Friends as parties
Identifies both of you by full legal name — the friendship is why the loan happened, but the document works on real names.
Amount lent
States the exact figure, in numbers and words, including any previous loans you agree to fold in.
How the money is sent
Records the transfer method and date, so the payment slip and the agreement tell one story.
Interest
Most friend loans are interest-free — this clause says so explicitly, so no one has to wonder.
Repayment date
The heart of the document: a real calendar date, or a short schedule of part-payments.
Repayment method
Names where the money goes back to, keeping every repayment traceable.
Partial payments
Confirms part-payments are welcome and count toward the total, with each one acknowledged in writing or chat.
If the date is missed
Sets the agreed next step — an honest conversation and a new written date — instead of awkward silence.
Keeping track
Commits you both to acknowledging each repayment, even with a simple chat message, so the balance is never a mystery.
Signatures
Both friends sign and date; a witness is optional but adds weight for larger amounts.
What the guided builder asks
- 1PartiesWho is providing the money?
- 2AmountHow much is being provided?
- 3RepaymentWill it be repaid once or in installments?
- 4InterestWill interest apply?
- 5Late paymentWhat happens if a payment is late?
- 6Additional termsAdditional terms (optional)
- 7ReviewClauses included
- 8ExportExport PDF · Export DOCX
How to sign it
Sign before or at the moment the money is sent, and give each person a copy — a clear photo of the signed page shared into the same chat where the loan was discussed works well, because it keeps the agreement and the conversation history side by side.
Witnesses are optional for friend loans, and many people skip them for small amounts. For a larger loan, a mutual friend signing as witness is a low-drama way to add weight — choose someone who will stay neutral if the two of you ever disagree.
Send the loan by bank transfer or PromptPay rather than cash whenever possible. The transfer record plus the signed agreement is a far stronger pair of evidence than either alone — chats, the slip, and the signature together tell a very complete story.
Common mistakes
- Treating the chat message 'I'll pay you back next month, promise' as your paperwork. Chats help as evidence, but they are usually vague about amounts and dates — the two things you most need to be exact.
- Lending an amount you secretly cannot afford to lose because saying no felt worse. Decide your real limit before the conversation, not during it.
- Leaving the repayment date open — 'when I get my bonus' is not a date, and it makes every future reminder feel like an accusation.
- Rolling loan after loan to the same friend without ever totaling them. When neither of you can name the exact balance, the friendship — not just the money — is at risk.
- Skipping the agreement because the amount 'is not worth the awkwardness'. The signing takes ten minutes; a friendship strained by a fuzzy debt can take years.
- Deleting the chat history where the loan was discussed. Keep it — it is supporting evidence for the agreement, not a replacement for it.
- Reminding through mutual friends instead of directly. The agreement gives you a neutral script: 'Hey, the 30th is coming up — still good?'
- Lending on a verbal 'I'll pay you back next month' with nothing written.
- Sending cash with no record instead of a traceable transfer.
- Never setting a date, so the loan quietly becomes a gift nobody acknowledges.
Frequently asked questions
Will asking a friend to sign ruin the friendship?
Most friendships survive a clear agreement far better than they survive an unpaid, undocumented loan. Keep it short and friendly; the document is there so the friendship never has to be the collateral.
Are LINE messages enough to prove a loan to a friend?
Chat messages can support a loan claim in Thailand, especially where they show the amount and a promise to repay, plus a transfer slip. They are stronger as backup to a short signed note than as the only evidence. See our guide on chat evidence.
Should I charge a friend interest?
Most people don't, and that's fine. If you do, keep it modest and within the legal ceiling, and state it clearly so it doesn't become a source of resentment.
Is a loan agreement between friends legally binding?
Generally yes — friendship does not make a signed loan contract less real. A written agreement between friends is treated like any other private loan in most countries, and it is dramatically easier to prove than 'we discussed it over dinner'. Enforcement details vary by country, and FinSafe provides general templates, not legal advice.
Isn't asking a friend to sign an agreement insulting?
Most people find the opposite once it is on the table. Try: 'Let's write it down so neither of us has to remember the details.' Borrowers often feel relief — a signed page proves they intend to repay and stops the lender from silently doubting them. The awkwardness lasts five minutes; the clarity lasts the whole loan.
Are chat messages enough proof of a loan?
They help a lot, and sometimes they are the only evidence you have — see our guide on chat messages as loan evidence. But chats are often vague about the exact amount and deadline, and messages can be deleted. A signed agreement plus the transfer slip is a much stronger combination.
Should I charge my friend interest?
Almost nobody does for typical friend loans, and this template assumes interest-free by default. If the loan is large or long-term and you want interest, agree the rate openly and write it in — but be aware it can change the feel of the arrangement, and in some countries interest income should be declared.
What do I do if my friend misses the repayment date?
Follow what you agreed in the 'if the date is missed' clause: raise it directly, kindly, and once — then set a new date in writing. If the friend goes quiet, a short written payment reminder is the next step. Our guide on what to do when a borrower misses a payment walks through the escalation.
Is it worth documenting a small loan, like ฿3,000?
For amounts you would shrug off losing, probably not — a clear chat message stating the amount and date may be enough. The tipping point is personal: if losing either the money or the friendship over it would sting, spend the ten minutes.
We already agreed everything verbally — is it too late to write it down?
Not at all, and doing it now is far easier than after a missed payment. Write down what you both remember agreeing, sign it, and the verbal deal becomes a documented one. If you only need the friend to confirm an existing debt in writing, a debt acknowledgment is an even shorter option.
This template provides general document assistance and is not a substitute for legal advice. Legal requirements vary by jurisdiction, transaction type, and individual circumstances.