The program knows it is your main home because that is how it begins, from sale of main home.Go through those question. This will allow you take the exclusion amount to which you are entitled while any taxable portion goes to the 6252. Follow these steps: Open to federal income Scroll down to sale of home answer questions, enter prices and dates answer questions Select yes when asked about payments after 2024. Select yes to installment sale continue answering questions The instructions for each line are below the form, see About Form 6252, Installment Sale Income.