Is an Interest-Free Loan a Gift? IRS Rules and Key Thresholds

An interest-free loan to a family member or friend is not itself a gift, as long as both sides genuinely intend repayment and the arrangement is documented. But the IRS treats the interest you didn’t charge as a separate gift flowing from you to the borrower. Whether that costs anyone real money almost always comes down to the size of the loan, the borrower’s investment income, and the annual gift tax exclusion, which is $19,000 per recipient for 2026.¹ For most family loans, the practical tax impact is zero on both sides.

How the IRS Splits an Interest-Free Loan Into Two Transactions

Under 26 U.S.C. § 7872, any loan that charges no interest or an interest rate below the government’s published minimum is a “below-market loan.” The gap between what a market-rate lender would have charged and what you actually collect is called “foregone interest.”²

The IRS then invents two transactions to fill that gap. You, the lender, are deemed to have made a gift to the borrower equal to the foregone interest. The borrower is then deemed to have paid that same amount back to you as interest. No money moves for either fictional transfer, but both can produce real tax consequences: you can owe income tax on phantom interest you never received, and the borrower has received what amounts to a tax-free gift.²

The government’s minimum rate is called the Applicable Federal Rate. Treasury publishes new AFRs every month, and the correct rate depends on how long the borrower has to repay. Charging any rate at or above the correct AFR eliminates the imputed-interest issue entirely; you can look up the current month on the IRS Applicable Federal Rates page.³

The $10,000 Safe Harbor

The smallest loans escape the framework entirely. If the total outstanding balance between you and one other person stays at $10,000 or less, the IRS ignores below-market loan rules. No imputed interest, no gift calculation, no reporting. The threshold is per-relationship, so you could lend $10,000 each to three different people and each loan would qualify on its own.²

One catch: if the borrower uses the money to buy stocks, bonds, rental property, or other income-producing assets, this exception disappears and imputed interest applies regardless of loan size. The rule exists to stop zero-interest lending from being used to shift investment income between family members.²

The $100,000 Net Investment Income Cap

Most family loans land here. For gift loans directly between individuals where the total balance stays at or below $100,000, the lender’s imputed interest income is capped at the borrower’s net investment income for the year. If the borrower earned $800 in dividends and interest, you report $800 of imputed interest, not the full foregone amount. And if the borrower’s net investment income is $1,000 or less, it rounds down to zero, meaning neither side owes income tax on the phantom interest.²

Two caveats. The $100,000 cap disappears if one of the principal purposes of the interest-free arrangement is federal tax avoidance. And the cap shields only the income tax side; the gift tax treatment of the foregone interest still applies in theory, though the foregone interest on a loan of this size almost always fits inside the annual gift exclusion anyway.²

A concrete example: you lend a sibling $75,000 interest-free, and the sibling has minimal investment income. Foregone interest at current AFRs might run a few thousand dollars a year, which fits comfortably inside the $19,000 annual gift exclusion. The income tax imputation is capped at the sibling’s low investment earnings. Practical impact on either return: zero.

The Gift Tax Side: Annual Exclusion and Lifetime Exemption

When foregone interest exists, it counts as a gift for tax purposes. For 2026 you can give up to $19,000 per recipient before any reporting is triggered. Married couples electing gift-splitting can double that to $38,000 per recipient.¹ Remember that foregone interest isn’t the only gift you might give someone in a year; birthday checks, holiday cash, and other transfers all count toward the same $19,000 limit for that person.

If total gifts to one recipient exceed $19,000 in a year, you file IRS Form 709 by April 15 of the following year. Filing that form does not mean you owe gift tax. It means you’re using a slice of your lifetime gift and estate tax exemption, which for 2026 is $15,000,000. The One, Big, Beautiful Bill Act, signed on July 4, 2025, raised the exemption from the $13,990,000 figure that applied in 2025.⁴ Actual gift tax doesn’t kick in until that full $15 million lifetime allowance is exhausted.⁵

What Happens If You Forgive the Loan Later

If you eventually cancel the remaining balance instead of collecting it, the forgiven amount becomes a gift. The IRS defines a gift as any transfer where you don’t receive full value in return, and wiping out a debt clearly qualifies.¹ The forgiven balance counts against your $19,000 annual exclusion for that recipient and, above that, against your $15,000,000 lifetime exemption.⁴

This is where larger balances create paperwork. Forgiving a $50,000 loan in a single year creates a $31,000 taxable gift after the annual exclusion, requires Form 709, and chips away at your lifetime exemption. A common workaround is to forgive the loan in annual installments of $19,000 or less, spreading the cancellation across multiple tax years so each slice fits within the exclusion. The IRS looks at the overall pattern, so document each year’s forgiveness separately.

For the borrower, a loan forgiven by a family member or friend is generally not taxable income, because it’s treated as a gift rather than cancelled debt. Private individual lenders are not the type of entities required to issue Form 1099-C.⁶

Document the Loan or Risk the Whole Thing Becoming a Gift

Without proper paperwork, the IRS can reclassify the entire loan as a completed gift on the day you made it. That means the full principal, not just the foregone interest, becomes reportable. This is the real risk in family lending, and it dwarfs anything the imputed interest rules do.

A written promissory note is the core document. At minimum it should include:

Full names of both the lender and borrower
The loan amount and the date funds are transferred
The interest rate charged, even if zero, stated explicitly
A repayment schedule with specific dates and amounts
Signatures from both parties, dated at or before the transfer

The note alone won’t save you if nobody follows it. The IRS looks at actual conduct: whether the borrower made payments on schedule, and whether the lender enforced the terms or let missed payments slide indefinitely. A pattern of consistent repayment is stronger evidence of a real loan than any language in the original document. Keep records of every payment, whether by check, bank transfer, or payment app.

Quick Reference: The Thresholds That Matter

$10,000 or less: the IRS ignores imputed interest entirely, unless the borrower invests the money in income-producing assets.²
$10,001 to $100,000: imputed interest applies for gift tax purposes, but the lender’s phantom income is capped at the borrower’s net investment income; if that income is $1,000 or less, the income tax impact is zero.²
Over $100,000: full imputed interest rules apply for both gift and income tax, with no cap on the lender’s phantom interest income.²
$19,000 annual gift exclusion for 2026: foregone interest under this per-recipient limit needs no reporting.¹
$15,000,000 lifetime exemption for 2026: gifts above the annual exclusion use this before any gift tax is owed.⁴

For most family loans under $100,000, the combination of the net investment income cap and the annual gift exclusion means the loan is not a gift, the imputed interest is not taxable in any real sense, and nobody owes anything extra at tax time. The failure mode isn’t the imputed interest math. It’s skipping the promissory note and letting the IRS treat the whole principal as a gift.

1
Internal Revenue Service. Frequently Asked Questions on Gift Taxes
2
Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates
3
Internal Revenue Service. Applicable Federal Rates
4
Internal Revenue Service. What’s New – Estate and Gift Tax
5
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
6
Internal Revenue Service. About Form 1099-C, Cancellation of Debt