The IRS Just Reset Its Minimum Interest Rates for August — Here's Why That Matters for Family Loans

A Number That Resets Every Month, With Real Consequences Attached

Most tax rules change once a year. This one changes monthly. Each month, the IRS publishes a set of Applicable Federal Rates (AFRs) — the minimum interest rates the tax code will accept on a private loan before it stops treating that loan like an ordinary one. For August 2026, the IRS released the new figures via Revenue Ruling 2026-13, issued in mid-July.

AFRs matter to a specific, common situation: money lent between people who aren't a bank. A parent lending a child money for a down payment. One family member helping another buy into a business. A seller financing part of a home sale directly to the buyer instead of routing everything through a mortgage lender. In all of these cases, the IRS has an interest rate opinion — even if the two people involved never intended the loan to look like a "financial product" at all.

What August's Rates Actually Are

The IRS splits AFRs into three buckets based on a loan's stated term, not how often payments are made:

• Short-term (3 years or less): 4.10% (annual compounding)
• Mid-term (more than 3 years, up to 9 years): 4.35% (annual compounding)
• Long-term (more than 9 years): 4.92% (annual compounding)

These are the minimums. A lender is always free to charge more. What the rule actually restricts is charging less — including charging 0%, which is more common between family members than people might assume.

For a standard term loan, the rate that applies is generally the one in effect the month the loan is made — and it stays locked in for the life of the loan. A three-year loan made in August 2026 locks in against the short-term rate published this month; it doesn't need to be re-tested against a new AFR every month going forward.

What Happens If You Charge Less

This is the part that catches people off guard. If a loan charges less than the applicable AFR — including a family loan with no stated interest at all — the tax code doesn't just let that slide as a personal choice between two people. Under Internal Revenue Code Section 7872, a below-market loan triggers two separate consequences at once:

1. Imputed interest income to the lender. The IRS treats the lender as if they actually received interest at the AFR, and taxes them on that phantom income — even though they never collected it.
2. A deemed gift to the borrower. The difference between what should have been charged and what actually was gets treated as a gift from the lender to the borrower, which counts against the lender's annual per-person gift tax exclusion (the amount someone can give another person tax-free each year).

In other words, an interest-free "loan" to a family member can quietly generate a tax bill for the lender on interest they never received, while simultaneously using up part of their gift tax exclusion for the year — a genuinely unpleasant surprise for a lender who thought they were just being generous.

The Exceptions That Cover Smaller Loans

The rule isn't absolute. Two carve-outs matter most for everyday family lending:

• Loans of $10,000 or less between individuals are generally exempt from these rules entirely — unless the money is used to buy or carry income-producing assets (like investments), in which case the exemption doesn't apply.
• Loans where the total outstanding balance between the two people is $100,000 or less can dodge the full imputed-interest hit if the borrower's net investment income for the year is $1,000 or less — in that case, the imputed interest is treated as zero. Cross the $100,000 threshold and this relief disappears entirely, no matter how little investment income the borrower has. It's a separate rule from the $10,000 exemption above, so don't confuse the two.

Neither exception is a reason to skip documentation. A loan without a signed note, a stated interest rate, and a real repayment schedule is exactly the kind of arrangement the IRS is most likely to recharacterize as a gift outright, regardless of the dollar amount involved.

How August's Rates Compare to Recent Months

August's short- and mid-term rates moved up slightly from where they sat a couple of months earlier, while the long-term rate eased back a bit after peaking in July. None of these are dramatic swings, but they're a reminder that AFRs aren't a "set it and forget it" number — a family loan planned for September could face a meaningfully different rate than one closing this month, depending on which direction the next revenue ruling moves.

A Few Questions Worth Asking Before Making a Family Loan

None of this is a substitute for advice from a tax professional or estate planning attorney about a specific situation, but here's what this month's rates make worth checking:

• What's the loan's actual term, and which AFR bucket — short, mid, or long — does that term fall into?
• Is there a signed promissory note specifying principal, interest rate, and a real repayment schedule, or is this an informal understanding that could be recharacterized as a gift?
• If the loan is under $10,000, is the money being used for anything income-producing that would void the small-loan exception?
• If charging below AFR is being considered deliberately, has anyone calculated what that means for imputed interest and the annual gift tax exclusion?

The Takeaway

Applicable Federal Rates are one of the more obscure corners of the tax code, precisely because they only bite when money moves between people who trust each other enough to skip a bank. That's exactly why they're worth understanding: a family loan made with good intentions and no paperwork is the single most common way this rule catches people by surprise. August's rates — 4.10% short-term, 4.35% mid-term, 4.92% long-term — are simply this month's version of a number that resets every month, and anyone structuring a private loan this month should make sure it's measured against the right one.

This article is educational commentary on IRS guidance and tax mechanics, not personalized tax, legal, or financial advice. Consult a qualified tax professional or estate planning attorney about how these rules apply to your specific situation.