[sonicanatidae]

>That algorithm is broken - it doesn't withhold the required amount for many people

This has been an issue historically, but spiked bigly after the 2017 Republican Tax plan. They perm lowered the corp tax rate from 35% down to 21%, perm lowered taxes overall for the wealthy.

The middle class and lower end, had their DEDUCTIONS lowered, but the taxes owed didn't change. This caused it to appear that they got a lowered tax rate, then everyone got hit with owing all of that "largess" in 2018.

TL;DR: Republican fuckery made it much worse, but it's always been a thing.

source: I've paid taxes for almost 4 decades now.