What are the rules for interest on underpayments of tax for large Section 453A installment sales?

Question

Tyler Smith · Accepted Answer

Section 453A of the Internal Revenue Code imposes an interest charge on the deferred tax liability arising from certain large installment sales. This rule applies to non-farm real property or personal property sales where the selling price exceeds $150,000, but only if the total face amount of all such installment obligations held by the seller that arose during the taxable year and remain outstanding at the close of the taxable year exceeds $5 million. The purpose of this provision is to discourage taxpayers from using installment sales primarily as a method for long-term, interest-free government financing of their tax liabilities. If a seller's outstanding installment obligations cross this $5 million threshold, they must calculate and pay an annual interest charge on the 'applicable percentage' of the deferred tax liability. The applicable percentage is determined by dividing the portion of the installment obligations exceeding $5 million by the total face amount of all obligations. This interest is computed using the IRS underpayment rate, which adjusts quarterly. The interest charge is considered an additional tax liability and is reported annually until all payments on the installment note are received. Sellers of high-value businesses or properties should be acutely aware of Section 453A's interest charge to accurately project their after-tax cash flows and ensure compliance with their annual tax obligations.