Neutral probably, might affect costs at IRS, but I would imagine relatively little change in revenue. The hiccup could be if people were consistently overestim

Neutral probably, might affect costs at IRS, but I would imagine relatively little change in revenue. The hiccup could be if people were consistently overestimating their taxes, but it looks as though for the median citizen that's unlikely (most people don't itemize and take the standard deduction at that income level).