Your sister needs $15,000 for a down payment and lending it feels simpler than dealing with a bank. No credit check, no origination fee, just family helping family. A family loan agreement is what turns that handshake into a document both sides can point back to and it’s also the thing that keeps the IRS from quietly treating your loan as a taxable gift. That second part is the piece most people never hear about until it’s already a problem.
This covers what a family loan agreement should include, the IRS interest rate rule almost every template glosses over and what happens if repayment doesn’t go as planned.
What Is a Family Loan Agreement?
A family loan agreement is a written contract between relatives that documents a loan: the amount, the repayment schedule, the interest rate if any and what happens if payments are missed. It works the same way a promissory note does between any two parties, just built specifically for the family context, where the instinct to skip the paperwork is strongest precisely because trust is highest.
The IRS Rule Most Guides Skip: The Applicable Federal Rate
Here’s the detail that catches families off guard. The IRS doesn’t let you lend money interest-free without consequences once the amount gets meaningful. If you charge less than the Applicable Federal Rate or AFR, the minimum rate the IRS publishes monthly for loans between related parties, the difference between what you charged and what the AFR required can be treated as a taxable gift to the borrower and you may owe income tax on interest you never actually collected.
As of mid-2026, AFRs sit roughly in the 4% range depending on the loan’s term: short-term for loans up to three years, mid-term for three to nine years and long-term for anything longer. These rates change monthly, so the one that matters is whichever was published for the month you actually fund the loan and it stays locked in for the life of the note after that. The official, current rates are published directly by the IRS’s Applicable Federal Rates page, which is worth checking before you finalize any interest-bearing family loan.
Do Small Family Loans Actually Need to Worry About This?
Usually not. Loans of $10,000 or less generally fall outside the AFR imputed interest rules entirely, so a small loan to help cover a car repair or a rough month doesn’t need this level of attention. Loans between roughly $10,001 and $100,000 get a partial exception tied to the borrower’s net investment income for the year, which often keeps the tax impact minimal or nonexistent. It’s loans above $100,000 or larger loans stretched over many years, where charging below the AFR starts to carry real tax weight and is worth actually structuring correctly from the start.
How to Actually Choose the Right AFR for Your Loan
The IRS publishes three AFR tiers each month and the one that applies depends entirely on the repayment term you set, not the borrower’s age or anything else about the relationship. A loan you expect to be repaid within three years uses the short-term rate. Anything between three and nine years uses the mid-term rate and anything longer than nine years uses the long-term rate. Picking the term first, then matching it to the correct AFR tier for the month you fund the loan, is the whole process. There’s no need to guess or average anything.
If you’re unsure which term makes sense, it often comes down to how the loan will realistically be repaid. A loan tied to a specific short-term need, like covering a gap before a home sale closes, usually fits the short-term tier. A loan meant to be paid off gradually over several years fits mid-term or long-term depending on the actual repayment horizon you agree on.
What a Family Loan Agreement Should Include
A solid agreement names both the lender and borrower clearly, states the exact loan amount, sets a repayment schedule with real dates rather than a vague “whenever I can” understanding and specifies the interest rate, even if that rate is simply the AFR minimum. It should also cover what happens if a payment is missed, whether early repayment is allowed without penalty and which state’s law governs the agreement if a dispute ever comes up.
Why “We Trust Each Other” Isn’t a Repayment Plan
Money disputes damage family relationships faster than almost anything else and the ones that go worst are usually the ones where nobody wrote anything down because it felt unnecessary between people who love each other. A written agreement isn’t a sign of distrust. It’s what protects the relationship by making expectations explicit before memories start to differ, which they eventually will once enough time and a few missed payments have passed.
What Happens If the Loan Isn’t Repaid
A signed family loan agreement is enforceable the same way any other loan document is. If repayment stalls entirely, the lender’s options generally move from a direct conversation, to a written demand referencing the signed agreement, to small claims court if it still isn’t resolved. Our guide on what small claims court is and when to use it walks through that process in more detail, including the dollar limits and what to expect if a family loan dispute actually gets that far.
Should the Loan Be Notarized?
Notarization isn’t legally required for a family loan agreement to be valid, but it does add a layer of evidence that the signatures are genuine, which can matter if the agreement is ever challenged. For smaller, lower-stakes loans, a simple signed and dated document is usually sufficient. For larger loans, particularly ones tied to real estate or a business investment, notarizing the agreement is a reasonable extra step.
Perfect For
Family loan agreements work for parents helping adult children with a down payment, siblings covering each other through a rough patch and relatives investing in a family member’s business. If you’re lending outside the family or need a more general lending document, our full library of free legal document generators covers a range of related agreements worth exploring.
Documenting Payments as They Come In
Once the loan is set up correctly, keeping a simple record of each payment protects both sides going forward. A basic log, noting the date and amount of every payment, gives the lender documentation that the loan is being treated as a real loan and gives the borrower proof of what’s already been paid if a disagreement ever comes up years later. This matters more than it seems worth at the time, particularly for longer loans where memories of exactly what was paid and when tend to fade well before the loan is fully repaid.
For loans large enough to carry real AFR implications, this payment record also supports the lender’s tax reporting each year, since the interest actually received needs to be reported as income regardless of how informal the arrangement feels day to day.
Common Mistakes to Avoid
The most common mistake is treating a large loan as informal simply because it’s family, then discovering the AFR issue only after the IRS flags it. Beyond that, people frequently skip a repayment schedule entirely, forget to put anything in writing at all and avoid the interest rate conversation because it feels awkward, even when skipping it is what creates the actual tax exposure.
Frequently Asked Questions
Q: Do I have to charge interest on a family loan?
Not on smaller loans, generally $10,000 or less. On larger loans, charging at least the AFR avoids potential imputed interest and gift tax complications.
Q: What happens if I charge 0% interest on a $200,000 family loan?
The IRS can treat the forgone interest as a gift to the borrower and tax the lender on imputed interest income, even though no interest payment was actually received.
Q: Can a family loan agreement be used as evidence the money wasn’t a gift?
Yes, a signed agreement with clear repayment terms is exactly the kind of documentation that supports treating a transfer as a genuine loan rather than a gift.
Q: Does the AFR change after the loan is made?
No, for a fixed-rate loan, the AFR in effect the month the loan is funded locks in for the life of the note, regardless of how rates move afterward.
Q: What if my family member never pays me back?
With a signed agreement in place, you have grounds to pursue repayment through a written demand or small claims court and in some cases may be able to claim it as a bad debt deduction if it’s clearly documented as an unrecoverable loan.