I finally filed my taxes yesterday. Miraculously, and with no intentional effort on my part, withholding compared to what would come due worked out pretty well this year. I'm getting $15 back from the franchise tax board (I have no idea why the hell our state tax agency has that name) and owe $570 to the IRS. Not bad for someone with 38 pages of income tax documents and some quirky investments I would never have personally made but which I inherited from my father. (energy trust royalties, anyone... I have no idea what the cost basis of them was but compared to their current value the royalties are pretty decent so i'll hold onto them despite the extra pages they add to my tax return every year.)
Now I need to start researching whether I need to modify my withholdings for 2018 to have a repeat scenario a year from now.