I’ve paid taxes in countries where it pre-filled forms.
Guess what I do? I get all my forms together. Look up the numbers on the forms. Double check the entries on the fillable forms are correct.
Then I get my paystubs, I check the deductions, double check the prefilled form is correct.
So what did it save me over the way US taxes are done? The form prefilled the numbers, that’s it. All the rest is the same. Same collecting forms, same doubling checking math.
And why? Because mistakes are made. My employer sent the wrong numbers in, so the prefilled form was incorrect and would have cost me about $1,000 in extra tax.
If you want to make tax filing better, make the tax code way more simple. I’ve lived in countries where the tax form was 2 pages with 12 entires. That’s it.
Now that is the way to go. I could care less about fillable forms.