The short answer: there is no single correct interest rate on a family loan, only a floor. The IRS sets a minimum through the Applicable Federal Rate (AFR), not a required rate. For July 2026, that floor is 4.00% on a short-term loan (3 years or less), 4.35% on a mid-term loan (3 to 9 years), or 4.98% on a long-term loan (over 9 years), all compounded annually. Below that floor, you still have real options, including 0% for smaller loans. Above it, you can charge whatever a willing borrower will accept.
Most families default to one of three choices: charge nothing, charge exactly the Applicable Federal Rate (AFR), or charge something closer to a market rate. Each has a different tax result and a different effect on the relationship. Here is how to pick, with the actual numbers.
What Is the Minimum Interest Rate on a Family Loan in 2026?
The AFR is published monthly by the IRS under Internal Revenue Code Section 1274(d). It is the minimum rate a loan between family members can carry before the government starts treating part of it as a gift, whether or not any money actually changes hands as interest.
The rate you use depends on the loan's term, fixed at the moment you sign the note, not on how quickly it happens to get repaid:
| Term | Applies to | July 2026 AFR (annual) |
|---|---|---|
| Short-term | 3 years or less | 4.00% |
| Mid-term | More than 3, up to 9 years | 4.35% |
| Long-term | More than 9 years | 4.98% |
Source: IRS Revenue Ruling 2026-12.
Two details trip people up:
- The term is locked in at origination. A 10-year note uses the long-term rate for its entire life, even if your daughter pays it off in year 4.
- AFRs move every month. The rate that matters is the one published for the month you sign the promissory note, not the rate in effect when the loan closes out or when you happen to check. Our Applicable Federal Rate explainer covers how the short, mid, and long tiers are calculated.
Demand loans, meaning the lender can call the balance due at any time rather than on a fixed schedule, use a different figure: the Section 7872 blended annual rate, set once per calendar year. For 2026 that rate is 3.82%. If your loan doesn't have a fixed repayment date, this is the number to compare against, not the short-term AFR.
Can You Charge 0% Interest on a Family Loan?
A 0% family loan is legal, and for smaller amounts it is genuinely free of interest-rate math. Below-market loans normally trigger imputed interest, the IRS treating you as if you'd charged the AFR and taxing you on the difference, but Section 7872 carves out a de minimis exception: gift loans between individuals are ignored entirely on any day the total outstanding balance between the two of you is $10,000 or less. Lend your nephew $6,000 for a used car at 0%, and there is no imputed interest to calculate, full stop.
Between $10,000 and $100,000, a second break applies under 26 U.S.C. Section 7872. The imputed interest the IRS assumes you "should have" charged is capped at the borrower's net investment income for the year, and if that income is $1,000 or less, it's treated as zero. Practically, this means a $40,000 interest-free loan to an adult child who isn't earning meaningful investment income themselves often produces no taxable phantom interest at all.
Cross $100,000 outstanding, and the de minimis breaks disappear. At that point the IRS imputes interest at the AFR regardless of your child's investment income, and you owe tax on interest you never collected. A $150,000 interest-free loan for a down payment, at the July 2026 mid-term AFR of 4.35%, would impute roughly $6,525 a year in phantom interest to the lender, taxable as if it had actually been received, then treated as a gift back to the borrower.
If you're forgiving a loan outright rather than charging a formal rate, that's a related but different question. See how to forgive a family loan without a gift tax bill for the annual exclusion mechanics ($19,000 per person for 2026).
Should You Just Charge the AFR?
This is the choice most estate attorneys recommend, and for good reason: charge at least the AFR for the loan's term, and Section 7872 stops applying entirely, regardless of the loan size. No imputed interest, no phantom income, no gift-tax exposure tied to the interest itself.
Run the numbers on a real scenario. Say a parent lends an adult daughter $60,000 for a small business, structured as a mid-term note (5 years) at the July 2026 mid-term AFR of 4.35% annually, interest-only with a balloon payment at maturity.
- Interest owed per year: $2,610
- Interest owed over 5 years: $13,050
- Effective cost to the daughter versus a same-term unsecured personal loan, which commonly runs 10 to 15% or more depending on credit: several thousand dollars saved in interest, while the parent still reports real, taxable interest income each year, exactly as a bank would.
Now push the same structure past the $100,000 line, say a $120,000 loan at 0% instead. The net investment income cap no longer applies, so the parent gets imputed roughly $5,220 a year in phantom interest at the mid-term AFR, taxable income with no cash behind it, every year until the loan is repaid or forgiven. Charging the AFR converts that invisible tax liability into a real, plannable one, and gives the daughter a paper trail showing this was a loan, not a gift, which matters if she ever divorces, files bankruptcy, or the estate is settled while the note is outstanding.
The AFR is also almost always below what a bank or personal-loan lender would charge, so the borrower still comes out ahead. That combination, real income for the lender, real savings for the borrower, and zero IRS friction, is why "just charge the AFR" is the default advice for any family loan over $100,000.
Can You Charge More Than the AFR?
Some family lenders want more than compliance. A retired parent living partly on investment income may want the loan to function like a bond: a rate that reflects real risk and opportunity cost, not just the IRS minimum. There's nothing stopping a family loan from carrying 6%, 7%, or more, as long as both sides agree and it's documented as debt, with a real repayment schedule, not disguised as something else.
The tradeoff is relational, not legal. A rate that's a few points above AFR but still below what a bank would charge (say, for an intra-family home loan) can be an easy sell: the borrower is still getting a materially better deal than the mortgage market, and the lender is compensated for tying up capital. A rate that matches or exceeds commercial lending, on the other hand, tends to invite the question of why the loan wasn't just done through a bank, and can read as extracting profit from a relative rather than helping one. If retirement income is the real goal, weigh whether the loan is worth the collection risk versus a comparable bond or CD at a similar yield with no family history attached.
Either way, a market-adjacent rate does not exempt you from Section 7872, it just clears the AFR floor by a wider margin, and the same documentation rules from Family Loans and Taxes: Complete 2026 Guide apply.
What Rate Applies to a Family Loan With No Fixed Term?
Not every family loan has a fixed term. A revolving line of credit to a sibling, or a loan with no set maturity that the lender could technically call at any time, is a demand loan under Section 7872(e), and it doesn't use the short, mid, or long-term AFR at all.
Instead, demand loans use the blended annual rate, published once per year rather than monthly. For all of 2026, that rate is 3.82%. If you're tracking a revolving family line of credit with multiple draws and no fixed payoff date, this is the single rate to compare your charged interest against for the entire year, which is simpler in practice than re-checking a monthly AFR table. Our guide to tracking a family line of credit with multiple withdrawals walks through structuring that kind of loan.
Which Interest Rate Fits Your Family Loan?
| If you... | Consider | Why |
|---|---|---|
| Are lending under $10,000, any purpose | 0% | De minimis exception means Section 7872 doesn't apply |
| Are lending $10,000 to $100,000 to a family member with low investment income | 0% or a token rate | Imputed interest is capped at their net investment income, often $0 |
| Are lending over $100,000 | AFR or higher | De minimis and income caps no longer apply; imputed interest is calculated regardless |
| Want the simplest, safest structure at any loan size | Exactly the AFR | Removes Section 7872 entirely; interest income is real and predictable |
| Need the loan to generate retirement or investment income | AFR plus a premium | Still must clear the AFR floor; document it as a real debt instrument |
| Have no fixed repayment date (a revolving line) | The 2026 blended rate (3.82%) | Demand loans use the annual blended rate, not the monthly term AFR |
Whatever rate you land on, put it in writing. A verbal understanding that "there's some interest" doesn't survive an audit, a divorce, or a disagreement between siblings. Our free loan agreement generator builds a note with the rate, term, and repayment schedule spelled out, and you can start tracking the loan from the first payment so both sides always agree on the balance.
This article covers general federal tax rules and is not personalized tax or legal advice. Loan amounts near the de minimis thresholds, loans tied to buying income-producing assets, or anything involving an estate plan should go through a CPA or estate attorney before you sign.
