Applicable Federal Rate (AFR)

An Applicable Federal Rate (AFR) is one of a family of prescribed interest rates the IRS publishes monthly for specified federal tax purposes. AFRs are used in rules for below-market loans, adequate stated interest, original issue discount, installment sales, and other transactions where the timing or amount of interest affects the tax result.

Calling the AFR a universal “minimum legal interest rate” is misleading. It is a tax benchmark, not a consumer-lending price or proof that an agreement is commercially reasonable. The correct rate depends on the governing tax rule, transaction date, loan term, payment structure, and compounding convention.

Key Takeaways

• The IRS publishes short-term, mid-term, and long-term AFRs each month in a revenue ruling.
• Term classification generally depends on the instrument’s maturity, not how long the parties expect the balance to remain outstanding.
• Each monthly ruling can show annual, semiannual, quarterly, and monthly compounding rates.
• A demand loan and a term loan can use AFR concepts differently under the below-market-loan rules.
• Charging an AFR-level stated rate can address one tax issue but does not establish credit quality, fair value, enforceability, deductibility, or regulatory compliance.
• Use the official ruling for the relevant month rather than a search result, old spreadsheet, or current-month rate applied retroactively.

AFR Term Categories

For the section 1274(d) rate structure, the common maturity categories are:

A five-year note is therefore generally associated with the mid-term category, while a ten-year note is generally associated with the long-term category. Demand loans require separate analysis because they do not operate like a fixed-maturity term loan.

How AFRs Are Published

The IRS publishes prescribed rates in monthly revenue rulings. A ruling typically includes:

• short-, mid-, and long-term AFRs;
• rates for several compounding periods;
• adjusted AFRs used for specified tax provisions; and
• other prescribed rates, including a section 7520 rate used for certain valuation calculations.

These values should not be treated as interchangeable. The annual-compounding mid-term AFR, for example, is not the same quoted input as the monthly-compounding mid-term AFR. The section 7520 rate is related to the prescribed-rate framework but is not simply another label for the AFR used on every private loan.

Where AFRs Matter

The relationship between the parties matters. The same forgone-interest amount can be characterized as a gift, compensation, dividend, contribution to capital, or another transfer depending on the transaction.

Choosing the Relevant Rate

An AFR review should identify at least six inputs:

1. Governing provision: Determine whether the issue arises under below-market-loan, installment-sale, OID, valuation, or another rule.
2. Transaction date: Use the month required by that provision and any valid transaction-specific election.
3. Loan type: Separate demand loans from term loans.
4. Maturity: Classify a term instrument as short-, mid-, or long-term.
5. Compounding: Match the rate to the agreement’s compounding and payment assumptions.
6. Payment pattern: Review balloon payments, deferred interest, variable rates, prepayments, and amendments.

An amendment, extension, refinancing, or significant modification can require a new analysis. Do not assume the original rate remains controlling after the economics of the instrument change.

Worked Example

Assume a parent makes a $50,000 demand loan to an adult child. The agreement charges 1.00% simple annual interest, and the assumed applicable demand-loan AFR for the period is 4.00%. If the balance remains $50,000 for the full year, a simplified estimate of forgone interest is:

Under the general below-market-loan framework, the lender may be treated as transferring the forgone amount to the borrower and the borrower as transferring it back as interest. In a gift-loan setting, the first deemed transfer may be a gift while the lender generally recognizes interest income.

This is an educational simplification. Daily balances, payment timing, compounding, exceptions, the borrower’s net investment income, and the exact monthly rates can change the tax computation.

AFR vs. Commercial Interest Rate

A loan can charge at least the AFR and still be economically imprudent, inadequately documented, or subject to other tax and legal issues. Conversely, the presence of a low rate does not establish the final tax consequence without checking whether the transaction is covered and whether an exception applies.

Documentation Checklist

• Signed note or loan agreement.
• Principal amount and funding date.
• Demand or fixed maturity terms.
• Payment and compounding schedule.
• Security or collateral documents.
• Official IRS revenue ruling for the relevant month.
• Evidence of interest and principal payments.
• Business, investment, compensation, shareholder, or gift purpose.
• Amendments, extensions, refinancings, and balance changes.
• Tax reporting for interest, OID, gifts, compensation, or distributions as applicable.

Common Mistakes

• Using today’s AFR for a note issued in an earlier month.
• Selecting the wrong short-, mid-, or long-term category.
• Ignoring the compounding convention shown in the ruling.
• Applying the simple rate difference used for a demand loan to every term loan.
• Treating the section 7520 valuation rate as the correct rate for every private loan.
• Assuming a family transfer is not a loan because payment terms are informal.
• Treating an AFR-level rate as evidence that the loan is commercially priced.
• Failing to revisit the analysis after a modification or extension.

Risks and Limitations

AFR analysis is highly transaction-specific. Below-market-loan exceptions and limits are narrower than common summaries suggest, and term loans can involve present-value and OID treatment rather than a simple annual interest adjustment. State law, lending regulation, gift-tax rules, entity law, and financial reporting can also apply independently.

The IRS publishes new rates monthly, so a numeric rate placed in a general article becomes stale quickly. Always retrieve the official revenue ruling for the relevant transaction month.

Authoritative Sources

• The IRS Applicable Federal Rates index provides the monthly revenue rulings containing prescribed rates.
• IRS Publication 550: Investment Income and Expenses explains below-market loans, demand and term loans, forgone interest, covered relationships, and exceptions.
• IRS Publication 537: Installment Sales explains adequate stated interest, test rates, unstated interest, and original issue discount in installment obligations.
• The IRS Section 7520 interest-rate tables provide the separate prescribed rates used for specified actuarial valuations.

Related Terms

• Imputed Interest: Interest tax rules may treat as paid even when little or no interest is stated.
• Demand Loan: Loan payable in full when the lender demands repayment.
• Taxable Interest: Interest included in income unless a specific exclusion applies.
• Interest Income: Broader financial-reporting concept for return earned on lending or interest-bearing assets.

FAQs

This article provides general U.S. financial education. It is not individualized tax, legal, lending, accounting, estate-planning, or investment advice.