After further conversation with
@EddyB43 and others I think it's completely possible that DSP meant to say he has paid off all of his Washington B&O tax for years 2014-2017 (consistent with the assumed ballpark $90-100 thousand dollar a year income) but doesn't yet know what interest or penalties he may have to pay and is waiting on that information from the Washington Dept. of Revenue.
There's just no way he straight up made $350K in 2017.
The alleged $4K federal estimated tax payment also pegs him at an annual tax liability of about $12K which is spot the fuck on for a $100K a year income with $25K in deductions (I'm assuming that value based on mortgage interest and other shit.)
This figure also makes sense because at that income level he could probably just barely scrape by with the kind of lifestyle and irresponsible spending he engages in, but would indeed have difficulties during slow income periods of the year and increased difficulties as minimum payments on credit cards increased with larger and larger balances.
So autism wins.