We are contemplating a twelve-million-dollar transaction with an eight-million-dollar installment note under Section 453, but our tax counsel warned us about an annual interest charge under Section 453A. How does this rule work, and how should we structure the installment notes across entities or tax years to minimize it?

Question

Tyler Smith · Accepted Answer

Section 453 of the Internal Revenue Code allows sellers to defer capital gains by recognizing income as installment payments are collected. However, Section 453A imposes a hidden penalty on larger transactions. If your aggregate installment obligations arising during a taxable year exceed five million dollars at year-end, you must pay an annual interest charge to the IRS on the deferred tax liability attributable to the excess balance.

This interest charge is calculated using the underpayment rate established under Section 6621, which can severely erode the net yield on your seller note. To mitigate this tax drag, your deal structure must manage the five-million-dollar threshold strategically.

First, evaluate ownership attribution. The five-million-dollar limitation applies per taxpayer. If your operating entity is an S-corporation or a partnership with multiple distinct equity holders, each partner or shareholder generally applies their own separate five-million-dollar threshold. A transaction with three equal partners can support up to fifteen million dollars in installment obligations before Section 453A triggers.

Second, consider multi-stage closings or mixed consideration. By structuring part of the deferred consideration as rollover equity, an earnout structured properly for tax reporting, or closing the sale of distinct operating subsidiaries across two separate tax years, you can keep the face value of installment paper arising in any single tax year below the statutory threshold. Run these scenarios through an IDS session with your transaction tax attorney before signing your letter of intent.