What are the rules for interest imputed on a Section 453 installment note?

Question

Tyler Smith · Accepted Answer

When an installment note is used in a Section 453 sale, the IRS requires that adequate interest be charged on the deferred payments. If the stated interest rate on the installment note is below the Applicable Federal Rate, AFR, the IRS will 'impute' or recharacterize a portion of each deferred payment as interest, even if the parties intended it to be principal. This is done under Section 483, 'Interest on Certain Deferred Payments,' and Section 1274, 'Original Issue Discount,' OID rules.

The purpose of these rules is to prevent sellers from converting ordinary interest income into lower-taxed capital gains. Imputed interest is taxed as ordinary income to the seller and is deductible as interest expense by the buyer. For the seller, this means that even if they structure the sale to receive only principal payments in later years, a portion of those payments might be reclassified as interest income, impacting their tax planning. It is critical for sellers to ensure that their installment notes carry an interest rate at least equal to the AFR at the time of sale to avoid these complications and ensure their intended tax treatment for capital gains deferral.