As suggested above,withholding can solve your problem.
there is no penalty if your withholding alone is 90% of your final income tax.
You don't need to make estimated tax payments.
OTHERWISE
To use Estimated Tax
In your situation,
withholding + estimated tax must be 110% of your prior year tax which includes the tax on your last bonus.
IRS requires four Estimated Tax contributions, on the specified dates,
in addition to your withholding which by default is apportioned evenly.
To make this work you must start with the First Estimated Tax payment which is due April 15th.
If you missed the first two estimated tax payments, it may not work.
If you meet the prior year rule requirement your bonus could be much larger or smaller it would not matter.
I'm not a tax expert if there are special rules for bonus over $1 million, consult a competent tax advisor.
@YosemiteKT
