I suspect it's an issue of Supply and Demand, as very few TT personal tax return customers would need it. A taxpayer is not required to file Form 8990 if it is a small business taxpayer and does not have excess business interest expense from a partnership. A taxpayer is also not required to file Form 8990 if it only has interest expense from certain excepted trades or businesses.
Form 8990 is available in TT Business (S Corp, C Corp, Partnership, Estates/Trust). What form of business do you have?
