I suspect that number would go way up by just providing a way to declare your dependents. Right now, for the vast majority of the population, especially those

I suspect that number would go way up by just providing a way to declare your dependents. Right now, for the vast majority of the population, especially those who don't just pay an accountant, their taxes consist of a "Where's Waldo" copy-and-paste adventure combining information from their W-2s and 1099s onto a handful of other forms, then adding up like 3 numbers. If that describes your tax filing experience, a pre-filled form would be perfect. Any omitted details are more likely to be in the government's favor than your own.