The IRS Just Told You the Minimum Interest Rate for Lending to Your Kids
The IRS published the Applicable Federal Rates for August 2026 in Revenue Ruling 2026-13 (following July's Revenue Ruling 2026-12), and the numbers are: 4.10% for short-term loans (3 years or less), 4.35% for mid-term loans (over 3 years up to 9 years), and 4.92% for long-term loans (over 9 years). These are not suggestions. They are the legal floor. Lend money to your daughter, your brother, or your business partner at a rate below the applicable AFR, and the IRS will pretend you collected interest you never actually received—then tax you on that phantom income.
This is not hypothetical. Section 7872 of the Internal Revenue Code gives the IRS explicit authority to impute interest on below-market loans. The mechanism is brutal in its simplicity: the difference between the AFR and the rate you actually charged is recharacterized as a gift from lender to borrower, and the lender is deemed to have received that difference as taxable interest income.
For families planning intra-family loans—whether for a home purchase, a business startup, or estate planning—the August 2026 rates set the compliance benchmark. Get the rate wrong and you trigger a cascade of income tax, gift tax, and reporting obligations that can cost thousands. Get it right and intra-family lending remains one of the most powerful wealth-transfer tools available.
Important
The AFR is locked in at the time the loan is made. If you issue a 10-year family loan in August 2026 at 4.92%, that rate satisfies the AFR requirement for the entire life of the loan—even if AFRs rise to 7% next year. The relevant rate is the one in effect when the loan is originated, not when interest payments are made.
The August 2026 AFR Table: All Three Terms
The IRS publishes AFRs monthly, with three term categories based on the loan's maturity :
| Loan Term | Category | August 2026 AFR (Annual) | Semiannual | Quarterly | Monthly |
|---|---|---|---|---|---|
| 3 years or less | Short-term | 4.10% | 4.06% | 4.04% | 4.03% |
| Over 3 years, up to 9 years | Mid-term | 4.35% | 4.30% | 4.28% | 4.26% |
| Over 9 years | Long-term | 4.92% | 4.86% | 4.83% | 4.81% |
For context, the July 2026 rates (from Revenue Ruling 2026-12) were 4.00% short-term, 4.35% mid-term, and 4.98% long-term. The August 2026 rates (published in Rev. Rul. 2026-13) adjusted to 4.10% short-term, 4.35% mid-term, and 4.92% long-term, reflecting Treasury yield adjustments in the June-July period.
The blended annual rate for 2026—used for demand loans with a fixed principal outstanding for the entire year—is 3.82%. This matters for open-ended family loans without a fixed repayment date.
August 2026 AFR by loan term
How Imputed Interest Works: The Math That Bites
Let's make this concrete with David, a retired engineer in Denver who lends his daughter Emily $200,000 to buy her first home. David wants to be generous, so he charges her 2% interest—well below the August 2026 mid-term AFR of 4.35% (the loan is structured as a 7-year term loan).
What David Thinks Is Happening
- Loan amount: $200,000
- Interest rate charged: 2%
- Annual interest David collects: $4,000
- David reports $4,000 in interest income on his tax return
What the IRS Says Is Happening
Under Section 7872, the IRS recalculates the loan at the applicable AFR :
- Applicable AFR (mid-term, August 2026): 4.35%
- Interest the IRS deems David should have collected: $200,000 x 4.35% = $8,700
- Interest David actually collected: $4,000
- Forgone interest (imputed interest): $8,700 - $4,000 = $4,700
David's $200,000 loan at 2%: what the IRS sees
The IRS treats this $4,700 as two simultaneous transactions :
- David is deemed to have received $4,700 in additional interest income (taxable at his marginal rate).
- David is deemed to have gifted $4,700 to Emily (potentially subject to gift tax reporting).
If David is in the 24% federal tax bracket, he owes an extra $1,128 in income tax on interest he never collected. And if the total deemed gifts to Emily exceed the $19,000 annual gift tax exclusion (2026 figure), David must file Form 709 and the excess counts against his $15.0 million lifetime gift tax exemption.
The Correct Approach
If David charges Emily at least 4.35%—the August 2026 mid-term AFR—none of this applies. No imputed interest. No phantom income. No gift tax recharacterization. The loan is simply a loan.
Use our IRS AFR Intra-Family Loan Calculator to model your loan amount, term, and interest rate against the August 2026 AFRs and see your exact imputed interest exposure.
The Two Safe Harbors: When Below-AFR Lending Is Legal
Section 7872 provides two exceptions that allow below-market family loans without triggering imputed interest :
Safe Harbor 1: The $10,000 De Minimis Exception
Gift loans of $10,000 or less are completely exempt from imputed interest rules—provided the borrower does not use the proceeds to purchase or carry income-producing assets. Lend your nephew $8,000 for a car at 0% interest? No AFR compliance needed. Lend him $8,000 to invest in a rental property? The exemption vanishes.
Safe Harbor 2: The $100,000 Limitation
For gift loans between $10,000 and $100,000, imputed interest is capped at the borrower's net investment income for the year under Section 7872(d)(1). Furthermore, under the IRS $1,000 de minimis rule (IRC Section 7872(d)(1)(E)), if the borrower's net investment income for the year is $1,000 or less, it is legally treated as zero—meaning no interest is imputed whatsoever.
However, this cap disappears entirely if the borrower uses the loan proceeds to purchase income-producing assets. And if the loan exceeds $100,000, full AFR imputation applies with no cap.
Warning
The $100,000 safe harbor applies to the aggregate of all outstanding gift loans between the same lender and borrower. If David has already lent Emily $60,000 in January and lends her another $50,000 in August, the total is $110,000—above the $100,000 threshold. Full imputation applies to both loans.
Term Selection: Matching the AFR to Your Loan Structure
Choosing the correct AFR term is critical. The IRS matches the AFR category to the loan's stated term at origination :
| Your Loan Structure | AFR Category | August 2026 Rate | Example Use Case |
|---|---|---|---|
| Demand loan (no fixed term) | Blended annual rate | 3.82% | Open-ended family line of credit |
| 1 to 3 years | Short-term | 4.10% | Short-term bridge loan for home purchase |
| 4 to 9 years | Mid-term | 4.35% | Standard family mortgage (7-year term) |
| 10+ years | Long-term | 4.92% | 15-year seller-financed property sale |
The Demand Loan Trap
If you lend money to a family member with no written repayment schedule—a "pay me back when you can" arrangement—the IRS treats it as a demand loan. The applicable rate is the blended annual rate (3.82% for 2026), recalculated each year the loan remains outstanding. This means your compliance rate changes annually, creating ongoing tracking obligations.
A written term loan at a fixed AFR is almost always preferable: you lock in the rate at origination and never worry about it again.
Case Study 2: Sarah's Seller-Financed Property Sale
Sarah sells a rental property in Austin to her son Michael for $450,000. Michael cannot qualify for a traditional mortgage, so Sarah seller-finances the sale with a 15-year note at 3.5% interest.
The Problem
The August 2026 long-term AFR is 4.92%. Sarah's 3.5% rate is 1.42 percentage points below the AFR.
- Annual imputed interest: $450,000 x (4.92% - 3.50%) = $450,000 x 1.42% = $6,390 per year
- Over 15 years, total imputed interest: approximately $95,850
- Sarah owes income tax on $6,390 per year she never collected
- At her 32% marginal bracket: $2,045 per year in phantom tax
Sarah's 3.5% seller-financed note: the annual phantom bill
The Fix
Sarah restructures the note at 4.92%—the August 2026 long-term AFR. Michael's monthly payment rises from $3,218 to $3,543, an increase of $325/month. But Sarah eliminates $6,390 per year in phantom income and $2,045 in phantom tax. Over 15 years, the tax savings total approximately $30,675.
Alternatively, Sarah could structure the sale at 4.92% but with a smaller down payment or a graduated payment schedule that keeps Michael's early payments manageable while still satisfying the AFR requirement.
Documentation: What the IRS Requires
An intra-family loan that satisfies the AFR is only defensible if it is properly documented. The IRS looks for the following hallmarks of a genuine loan (as opposed to a disguised gift) :
- A written promissory note stating the principal amount, interest rate (at or above the AFR), repayment schedule, and maturity date.
- A fixed repayment schedule with regular payments (monthly, quarterly, or annually). Demand loans are permissible but carry the blended-rate complication.
- Actual payments made on schedule. If the borrower skips payments and the lender does not enforce the note, the IRS may recharacterize the entire arrangement as a gift.
- Collateral or security (for larger loans). A mortgage on the purchased property, a UCC filing on business assets, or a personal guarantee strengthens the loan's legitimacy.
- Reporting of interest income. The lender must report interest received on Schedule B of Form 1040. For loans exceeding $10,000, the borrower may need to report interest paid.
Tip
Have an attorney draft the promissory note and amortization schedule. The cost ($300 to $800 for a straightforward family loan document) is trivial compared to the gift tax and income tax exposure of an undocumented or below-AFR loan. For loans exceeding $100,000, engage a tax advisor to confirm the AFR category and structure.
AFR Trend Context: Where August 2026 Sits in the 2026 Curve
The August 2026 rates represent an uptick from earlier in the year. Here is the trajectory :
| Month | Short-Term AFR | Mid-Term AFR | Long-Term AFR |
|---|---|---|---|
| January 2026 | 3.63% | 3.81% | 4.63% |
| March 2026 | 3.59% | 3.72% | 4.59% |
| May 2026 | 3.82% | 3.95% | 4.72% |
| June 2026 | 3.85% | 4.00% | 4.78% |
| July 2026 (Rev. Rul. 2026-12) | 4.00% | 4.35% | 4.98% |
| August 2026 (Rev. Rul. 2026-13) | 4.10% | 4.35% | 4.92% |
Short-term AFR through 2026
The upward trend reflects rising Treasury yields through mid-2026. For families planning intra-family loans, this creates a timing consideration: locking in a long-term loan at the August 2026 rate of 4.92% is preferable to waiting if rates continue climbing. Conversely, if you expect rates to fall, a short-term loan (locked at 4.10%) with a refinancing provision at maturity may be more strategic.
For a broader look at how federal tax rates interact with investment income, see our guide on How to Calculate Your US Federal Income Tax in 2026.
Estate Planning Applications: Why AFR Loans Beat Outright Gifts
Intra-family loans at the AFR are a foundation of estate planning for high-net-worth families. The strategy works because the AFR is typically below the investment returns the borrower can achieve with the funds:
- Parent lends child $500,000 at the August 2026 long-term AFR of 4.92%.
- Child invests the funds in a diversified portfolio earning 8% annually.
- The spread (8% - 4.92% = 3.08%) accrues to the child, outside the parent's taxable estate.
- Over 20 years, that 3.08% annual spread on $500,000 compounds to approximately $415,000 in wealth transferred free of gift tax.
Compare this to an outright gift: the parent would use $500,000 of their lifetime gift tax exemption ($15.0 million in 2026), and all future growth on the gifted assets would still be outside the estate. But the loan approach preserves the parent's exemption for other uses while achieving a similar transfer.
For more on tax-advantaged wealth building, our Compound Interest Guide shows how the spread between borrowing cost and investment return compounds over decades.
