You lend your daughter $200,000 to buy her first home. You don't charge interest — she's family, and it feels wrong to profit from your own child. A year later, your accountant asks if you filed Form 709. You haven't. You didn't even know you needed to.
This scenario plays out constantly. And it's entirely avoidable — if you understand two IRS concepts: the Applicable Federal Rate (AFR) and imputed interest.
What Is the AFR?
The Applicable Federal Rate is the minimum interest rate the IRS requires on loans between related parties. The IRS publishes AFR rates monthly in Revenue Rulings, broken into three tiers based on the loan's term:
- Short-term (0-3 years): ~4.0-4.5%
- Mid-term (3-9 years): ~4.0-4.3%
- Long-term (over 9 years): ~4.3-4.6%
These rates change monthly, but the rate that matters is the one published in the month you fund the loan. Once locked, it stays fixed for the life of the note — even if AFR moves up or down later.
The AFR exists because the IRS doesn't want people disguising gifts as "loans" to avoid gift tax. If you lend money to family at below-market rates, the IRS assumes you're really making a gift of the interest difference.
What Is Imputed Interest?
When your interest rate is below the AFR — including zero — the IRS imputes the missing interest. Here's what that means in practice:
You lend $200,000 at 0%. The long-term AFR is 4.5%. The IRS says: "You should have charged $9,000 in interest this year. Since you didn't, we're treating that $9,000 as if you received it (taxable income to you) and then gifted it to your daughter (a taxable gift from you)."
So you now have:
- $9,000 in phantom income you must report on your tax return (even though you never received it)
- $9,000 in deemed gifts that count toward your annual exclusion ($19,000 in 2025)
If the imputed interest exceeds the annual gift exclusion, you must file Form 709 (Gift Tax Return) and the excess counts against your lifetime exemption ($13.99M in 2025).
The Math Gets Worse at Scale
The imputed interest problem compounds with larger loans:
- $100,000 at 0% (AFR 4.5%): $4,500/year imputed — under the $19K exclusion, so no Form 709. But you still owe income tax on phantom interest.
- $500,000 at 0%: $22,500/year imputed — exceeds the $19K exclusion by $3,500. Form 709 required. Lifetime exemption eroded every year.
- $1,000,000 at 0%: $45,000/year imputed — $26,000 above the exclusion. That's $26,000/year eating your lifetime exemption, plus income tax on $45,000 of phantom income you never touched.
The De Minimis Exceptions
The IRS provides two exceptions that simplify small loans:
Loans of $10,000 or less: Generally exempt from AFR rules entirely — unless the borrower uses the money to purchase income-producing assets (stocks, rental property, etc.). If they do, AFR applies even on small amounts.
Loans between $10,001 and $100,000: Imputed interest is capped at the borrower's net investment income for the year. If the borrower has zero net investment income, imputed interest is zero. This is a meaningful exception for loans to children or family members who don't hold investment portfolios.
Loans above $100,000: Full AFR rules apply. No exceptions.
The Simple Fix: Just Charge AFR
Here's the good news: AFR rates are significantly below commercial lending rates. A family loan at AFR is still a fantastic deal for the borrower:
- Bank mortgage rate: 6.5-7.5%
- Private lender rate: 8-12%
- Long-term AFR: ~4.5%
Your daughter saves thousands per year compared to any commercial alternative. You earn modest interest income that stays in the family. The IRS is satisfied. No Form 709. No phantom income. No eroded exemption.
The rate you lock in at funding stays fixed forever. If AFR drops next month, your rate doesn't change — and that's fine. What matters is that it met AFR at the time of funding.
What You Need to Do It Right
Charging AFR is necessary but not sufficient. The IRS needs to see that this is a genuine loan, not a gift wearing a costume. You need:
- A written promissory note — signed by both parties, with amount, rate, term, and payment schedule
- Actual payments being made — traceable via bank transfer, not cash
- A payment ledger — tracking every payment with date, amount, and principal/interest split
- Interest income reported — lender reports on Schedule B
If you have a loan with no promissory note, no real payments, and no interest, the IRS will reclassify the entire balance as a gift — not just the interest.
How HonestDeed Makes This Effortless
HonestDeed's Handshake tier ($49 setup + $5/month) handles all of this automatically:
- Verifies the rate meets the current month's AFR at funding
- Generates a standardized, legally reviewed promissory note
- Processes monthly ACH payments on a fixed schedule
- Maintains a complete payment ledger with principal/interest split
- Provides IRS-ready records at tax time
- Sends compliance alerts for AFR changes and gift exclusion thresholds
The platform sits between family members as a neutral third party. No one has to play banker. The relationship stays personal. The money stays professional.
Bottom Line
If you're lending to family, charge at least the AFR. It's low, it's fair, and it keeps the IRS out of your Thanksgiving dinner. The alternative — zero interest or below-AFR rates — creates phantom income, gift tax reporting, and exemption erosion that costs far more than the interest would have.
Read the complete Family Loans & Intra-Family Financing Guide for structuring advice, documentation checklists, and common scenarios. Or run the numbers on your specific situation.