The following diagnostic is generating: This return has a deferred tax on the gain from an installment sale with sale price exceeding $150,000, and the total of all installment sale obligations that arose during the tax year and were outstanding at the end of the year exceeded $5 million. Interest on the deferred tax on the gain must be reported per section 453(a)(1). I am just trying to understand the proper application of this diagnostic and rule. I see where to enter the number, IF I need to enter a number. Still researching, but if anyone want to enlighten me would be great.