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If your state has income taxes, the safe harbors are likely to be different.

Thanks, vkg, for bringing this to my attention.

I live in Michigan, so I just searched for michigan state income taxes safe harbor (using, my default search engine), and found this:,4676,7-238-75545_43715-1827...

The Michigan Department of Treasury follows the Internal Revenue Service (IRS) guidelines for estimated tax requirements. Based on the IRS estimated income tax requirements, to avoid penalty and interest for underpaid estimates, your total tax paid through credits and withholding must be:

90% of your current year's tax liability
or 100% of your previous year's tax liability,
or 110% of your previous year's tax liability if your previous year's adjusted gross income is more than $150,000 ($75,000 for married filing separate).

My 2019 Michigan tax bill was about $2100, and I've had about $1500 withheld so far in 2020. I've adjusted my W-4 to increase my withholding, so I should have no problem getting about $2100.

(And I'll keep on eye on it to be sure I do go above $2100!)

Thanks, vkg!
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