Family Loan Tax Implications in the United States

Q: Is interest on a family loan taxable in the US?

Yes, interest income from a family loan is generally taxable to the lender and should be reported on the federal return. For the borrower, interest is generally not deductible unless the loan is used for qualifying purposes such as mortgage, business, or investment use.

Overview

The United States has some of the most detailed tax rules governing family loans. The IRS wants to ensure that private loans between family members are genuine lending arrangements — not disguised gifts used to avoid gift or estate taxes. Understanding the Applicable Federal Rate (AFR) and gift tax rules is essential for anyone making or receiving a family loan in the US.

The Applicable Federal Rate (AFR)

The AFR is the cornerstone of US tax law for family loans. Published monthly by the IRS, the AFR represents the minimum interest rate the IRS considers acceptable for private loans. Rates are categorised by loan term:

Short-term AFR: Loans with terms of 3 years or less
Mid-term AFR: Loans with terms of 3 to 9 years
Long-term AFR: Loans with terms exceeding 9 years

The rates change monthly and are published in IRS Revenue Rulings. You can find the current rates on the IRS website.

What happens if you charge below the AFR?

If you make a family loan at an interest rate below the AFR (including 0%), the IRS may treat the difference as "imputed interest." This means:

The lender may owe income tax on the imputed interest — the interest the IRS considers they should have earned, even though they did not actually receive it.
The imputed interest may also be treated as a gift from the lender to the borrower, potentially subject to gift tax rules.

Gift Tax Rules and Family Loans

The US has a federal gift tax regime with annual exclusion and lifetime exemption amounts that are adjusted over time. In many family-loan scenarios, these thresholds can limit or eliminate immediate gift-tax liability, but reporting may still be required in some situations:

Annual exclusion: A yearly per-recipient amount is available and changes periodically.
Lifetime exemption: Amounts above the annual exclusion can count toward a lifetime gift and estate tax exemption, which also changes over time.

Small loan exception

The IRS provides a notable exception: for loans of $10,000 or less, the imputed interest rules generally do not apply, provided the loan is not used to purchase income-producing assets. This means small family loans can often be made at 0% without tax concerns.

$100,000 exception

For loans between $10,001 and $100,000, imputed interest is limited to the borrower's net investment income for the year. If the borrower has no net investment income (or less than $1,000), the imputed interest may be treated as zero. This provides some relief for moderate-sized family loans where the borrower is not using the funds for investments.

Interest Income and Tax Returns

For the lender, any interest earned on a family loan (whether actually charged or imputed by the IRS) is taxable income and should be reported on the federal return (including Schedule B where required).

For the borrower, interest paid on a family loan is generally not deductible unless:

The loan is used to purchase a qualifying residence and is secured by the property (mortgage interest deduction)
The loan is used for business or investment purposes (subject to the same deduction rules as bank loan interest)

Documenting a Family Loan for the IRS

The IRS may challenge a family loan if it lacks the characteristics of a genuine lending arrangement. To protect both parties, ensure your loan has:

A written promissory note or loan agreement signed by both parties
A stated interest rate at or above the AFR
A defined repayment schedule with specific dates and amounts
Evidence of actual repayments being made (bank statements, payment records)
Consequences for non-payment (even if informal, noting what would happen helps demonstrate genuineness)

A tool like FamLoan creates exactly this documentation trail — written terms, tracked payments, and clear records for both parties.

State Tax Considerations

In addition to federal rules, some states have their own considerations:

States with income tax will generally follow the federal treatment of interest income.
A few states have their own gift or inheritance tax rules that may apply. Check your state's specific requirements.
Community property states may have different rules for how family loans are treated between spouses.

Common Scenarios

Parent lending to child for a home deposit

This is the most common family loan scenario in the US. The parent lends money for a down payment, charging at least the AFR. The child gets a lower rate than a bank would offer, and the parent earns more than they would in a savings account. Both parties should have a written agreement and track payments. The mortgage lender may require a gift letter or loan documentation for the down payment source.

Interest-free loan to a child in college

For loans under $10,000, the imputed interest rules generally do not apply. For larger loans, the $100,000 exception may limit the impact if the student has little or no investment income. Having a written agreement that documents the intent to repay is still important.

Frequently Asked Questions

What is the IRS Applicable Federal Rate (AFR) for family loans?

The AFR is a set of IRS-published monthly rates used in federal tax rules for private loans. It is categorised by term: short-term (up to 3 years), mid-term (3–9 years), and long-term (over 9 years). You should check the current rates on the IRS website when setting up your loan.

Do I need to pay gift tax on a family loan?

If your family loan charges at least the AFR and is genuinely expected to be repaid, it is not a gift. If you lend at below the AFR, the imputed interest may be considered a gift. Annual exclusion and lifetime exemption amounts change, so check current IRS figures when planning.

Is interest on a family loan taxable in the US?

Yes, interest income from a family loan is taxable to the lender and must be reported on their federal tax return. For the borrower, the interest is generally not deductible unless the loan qualifies for mortgage interest or business expense deductions.