We are structuring our exit using an installment sale under Section 453, and the buyer is offering a variable interest rate tied to SOFR to match their bank financing. How does a floating interest rate affect our installment note tax reporting, and how do we negotiate a floor to protect our cash flow?

Question

Tyler Smith · Accepted Answer

Utilizing an installment sale under Section 453 is an effective way to defer capital gains tax, but accepting a purely variable interest rate tied to SOFR introduces unnecessary cash flow risk. For tax purposes, the IRS requires that installment notes carry an adequate rate of interest to avoid the imputed interest rules. A variable rate linked to a widely used market index like SOFR generally satisfies this requirement. However, if interest rates decline significantly, your projected interest income will drop, reducing your total deal yield. To protect your cash flow, you must negotiate an interest rate floor. This floor ensures that even if SOFR plummets, your interest rate cannot drop below a specified baseline, such as five percent. Conversely, you should also negotiate a cap to prevent the buyer from defaulting if interest rates spike to unmanageable levels. Frame this negotiation around debt service coverage. Use your financial projections to show the buyer that an interest rate floor provides predictability for their cash flow modeling, making it easier for them to plan their debt payments. Ensure the mechanics of the rate adjustments, including the calculation dates and interest payment schedules, are clearly outlined in the promissory note to avoid any post-close disputes.