But do 40% of households not file tax returns, because that is what we are talking about here, and I'm pretty sure a large portion of that 40% do file because they get refunds/rebates, and I'm pretty sure a large portion of that portion use a service because they can get their refund/rebate quicker (though as a loan at payday loan advance rates).
I'm not disputing that many of them file a return. I'm saying that they wouldn't possibly be paying for this system, which is paid for by federal taxes.
~40% of households pay no federal income tax today. They'd literally pay nothing for this service.