Withholding is a down payment on your tax bill. It is not the bill. Come April, the IRS adds up all your wages, base plus stipend, and settles up against the real brackets. The word "stipend" changes nothing about what you actually owe.
"The stipend gets taxed at a higher rate."
There is no special tax bracket for stipends or bonuses. Your tax is calculated once, on your total taxable income for the year. Base and stipend land in the same pile.
The 22% is withholding, not a tax rate.
The IRS lets employers set aside a flat 22% on supplemental pay (stipends, bonuses, commissions) instead of using your W-4. That is a collection shortcut for the employer. It is not what you owe.
"So the IRS keeps more of my money."
No. If they withhold more than you owe, you get it back as a refund. If they withhold less, you pay the difference. Either way it reconciles to the same final number.
It is just wages on your W-2.
A cash stipend that makes up a pay difference is supplemental wages, not some separate "fringe benefit" category. Same income tax, same Social Security and Medicare (7.65%), same as every other dollar you earn.
At this income a single filer's top dollars sit in the 22% marginal bracket — the same 22% the stipend was already withheld at. So the flat withholding roughly matches what you owe on it. No penalty, no premium. And Washington has no state income tax, so there is zero state withholding wrinkle on any of it.
The tax panic is aimed at the wrong target. A stipend promised by execs is only as solid as what's in writing. These are the real questions: