Try excluding grants from business gross with some self-employed clients, and let us know what happens. Because so far, every resource I find, including the IRS, describes this as: "The receipt of a government grant by a business generally is not excluded from the business's gross income"

which is Line 1, Schedule C.

There are some very specific grants that can be excluded. Fed and States all have various provisions. Nowhere have I seen you are supposed to call it "other" on the business or the personal returns, because it is not Means Tested and it is for Business.