Federal law sets no ceiling on how much you can loan a family member tax-free. You can lend $5,000 or $5 million without breaking any statute. What determines whether the transfer stays a loan (no tax consequences) or gets reclassified as a taxable gift comes down to three things: charging at least the IRS’s minimum interest rate, putting the terms in writing, and actually collecting payments. There is also one clean shortcut for small amounts, which is where most family loans start.
Loans of $10,000 or Less: The Simplest Case
If the total outstanding balance between you and a single family member stays at or below $10,000, the below-market interest rules don’t apply. You can charge zero interest and owe nothing to the IRS.1Office of the Law Revision Counsel. 26 U.S. Code 7872 – Treatment of Loans With Below-Market Interest Rates
Two things to watch. The $10,000 is an aggregate, not per-loan: if you lend your brother $6,000 in March and $5,000 in October, $11,000 is outstanding at once and you’ve blown past the exception. And the exception disappears entirely if the borrower uses the money to buy income-producing assets like stocks or a rental property.
Above $10,000: Charge at Least the Applicable Federal Rate
Once you cross $10,000, the loan has to carry interest at least equal to the Applicable Federal Rate for the month you fund it. The AFR is published monthly by the IRS and comes in three tiers based on how long the borrower has to repay.2Internal Revenue Service. Applicable Federal Rates Rulings For January 2026 those rates are:
- Short-term (3 years or less): 3.63% annually
- Mid-term (over 3 years, up to 9 years): 3.81% annually
- Long-term (over 9 years): 4.63% annually
Those figures come from Revenue Ruling 2026-2.3Internal Revenue Service. Rev. Rul. 2026-2 The statutory framework for the three tiers sits in Section 1274(d) of the tax code.4Office of the Law Revision Counsel. 26 U.S. Code 1274 – Determination of Issue Price in the Case of Certain Debt Instruments Issued for Property Lock in the rate for the month you fund the loan; once set, it stays fixed for the life of the loan even if later AFRs climb.
Charge less than the AFR and the IRS imputes the missing interest. It treats the shortfall as phantom interest income to you (taxable on your return) and simultaneously as a gift from you to the borrower. You end up owing tax on interest you never actually received. Report the interest you do collect on Schedule B of your return if your total interest income for the year exceeds $1,500.5Internal Revenue Service. Instructions for Schedule B (Form 1040) No one sends a 1099-INT for a family loan, so tracking it is on you.
Loans Up to $100,000: A Practical Safe Harbor
For gift loans where the total outstanding balance is $100,000 or less, the imputed interest you must report is capped at the borrower’s net investment income for the year. If the borrower’s investment income is under $1,000, the IRS treats it as zero, meaning you owe no tax on imputed interest at all.6Internal Revenue Service. Publication 550 (2024), Investment Income and Expenses
For a parent lending a child money for a first home, this is the practical answer. If your child has no meaningful brokerage or rental income, the imputed interest math zeroes out. You still need to structure the loan correctly, but you’re not going to owe tax on interest you didn’t collect. The safe harbor does not apply if tax avoidance is one of the main purposes of the arrangement.
What “Tax-Free” Actually Requires
Charging the AFR is necessary but not sufficient. The IRS looks at whether the arrangement behaves like real debt. A written promissory note, signed before any money changes hands, is the single most important piece of evidence. It should spell out:
- Full legal names of lender and borrower
- The exact principal amount
- The interest rate (at least the AFR for the funding month) and how it compounds
- A concrete repayment schedule: monthly, quarterly, or annual, with dates
- A maturity date for the final payment
- What happens if the borrower defaults
- Both signatures and the date, ideally witnessed or notarized
The repayment schedule is where family loans most often collapse. “Pay me back whenever” is exactly the language the IRS points to when it reclassifies a loan as a gift. Pick a realistic schedule and follow it. For a home purchase, securing the loan with a recorded deed of trust or mortgage against the property strengthens the arrangement considerably; recording fees generally run between $25 and $250 depending on the jurisdiction.
If the IRS Calls It a Gift Anyway
Getting reclassified doesn’t automatically mean writing a check to the IRS, but it does eat into two thresholds you may want to preserve.
The annual gift tax exclusion for 2026 is $19,000 per recipient.7Internal Revenue Service. What’s New — Estate and Gift Tax You can give any one person up to $19,000 in a calendar year without filing anything. Married couples can double that to $38,000 per recipient by electing gift splitting on Form 709, where each spouse is treated as having made half the gift.8Office of the Law Revision Counsel. 26 U.S. Code 2513 – Gift by Husband or Wife to Third Party
Anything above the annual exclusion counts against your lifetime gift and estate tax exemption, which sits at $15,000,000 per person for 2026.9Office of the Law Revision Counsel. 26 U.S. Code 2010 – Unified Credit Against Estate Tax Congress raised that figure from roughly $13.6 million through the One, Big, Beautiful Bill Act, signed into law on July 4, 2025.7Internal Revenue Service. What’s New — Estate and Gift Tax For most families that lifetime figure is high enough that no gift tax ever comes due. But every reclassified dollar above the annual exclusion reduces the amount sheltered from estate tax later, which is why the loan structure matters even when no immediate tax bill is on the table.
When a gift to one recipient exceeds $19,000 in a year, you have to file Form 709 to report it, even if no tax is owed.10Internal Revenue Service. Instructions for Form 709
Red Flags That Get a Loan Reclassified
The IRS and the courts look at substance, not just paperwork. Signed promissory note or not, any of the following patterns can turn a loan into a gift:
- No actual payments have ever been made, or payments stopped early with no collection effort
- The interest rate is zero or a token amount below the AFR
- The repayment terms are open-ended, with no fixed schedule
- A large amount was lent unsecured, when any bank would require collateral
- The borrower was insolvent or had no realistic income to repay at the time of the loan
- Principal or interest gets forgiven every year in amounts that happen to match the annual exclusion
That last pattern deserves particular caution. Forgiving $19,000 of principal each year to stay under the annual exclusion works on paper. If the IRS concludes you never intended to collect in the first place, it will treat the entire original transfer as a gift made the day you handed over the money, not as a series of annual forgiveness events. The difference can be enormous.
The core question in any audit is whether there was a real expectation of repayment and a real intent to enforce it. The closer your family loan looks to what a bank would do (documented terms, market-rate interest, regular payments, consequences for default) the stronger your position if the IRS ever asks.