My 2017/2018 total deposits will match my FY 2017 obligation to avoid any underpayment fees.
How is this different than any prior year?
As far as individual filings go I don't think the normal worker has a clue to how it's going to end up.
Huh? Withholdings were adjusted in January, thus workers are already receiving higher paychecks (lower withholdings) and thus they should have similar overpayments or required payments in April 2019 as they did in April 2018. This isn't complicated.
As a silly side note, if the moron ends up slapping China with a 25% Tariff on $525 Billion dollars of goods yearly he'll recoup the $1.25 Trillion Dollar cost of the Tax Cut.