Imputed Interest

What Is Imputed Interest?

Imputed interest is interest that the tax code treats as having been earned by a lender and paid by a borrower, even though the loan terms did not state that interest or stated only a low rate. The rules exist so that parties cannot avoid tax by structuring a transaction so that the value of interest is hidden in other forms, such as an interest-free loan or a sale price with no stated financing charge.

How It Works

Tax rules generally compare what was actually charged with a benchmark rate set by the tax authority. In the United States, the Internal Revenue Code's rules on below-market loans require that a loan's interest be recalculated at a benchmark rate, and the difference is treated as interest for tax purposes. The benchmark is the applicable federal rate, which the IRS publishes periodically. Imputed interest also applies to deferred-payment sales, where part of the price may be recharacterized as interest if the contract lacks adequate stated interest.

Imputed interest also appears in debt that pays no periodic interest. A zero-coupon bond is sold at a discount to its face value, and that difference is called original issue discount. Holders generally must report a portion of the discount as interest income each year, even though no cash is received until maturity.

Example

Suppose a parent lends a child a sum of money under a promissory note that charges no interest. Because the loan carries below-market terms, the tax rules may treat part of the loan as if it carried interest. The lender may then report imputed interest income, and the foregone interest may also be treated as a transfer that could raise gift tax questions. The actual result depends on the loan's terms, the benchmark rate in effect at the time, and the specific rules that apply.

Why It Matters to Investors

Investors mainly encounter imputed interest as taxable income that must be reported even when no cash is received. Holders of zero-coupon bonds and similar discount instruments may owe tax on accrued income in years with no payment, which affects after-tax returns. Understanding the concept also helps when comparing bonds with different coupon structures and when reading the tax forms that brokers provide. The exact treatment varies by jurisdiction and instrument, so official tax guidance is the authoritative source.