After you file

...but for $2, I wouldn't bother trying to work thru the forms to eliminate the underpayment penalty.

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Takes a lot of records gathered to provide the detail needed to supply all your income (wages, gains, dividends,interest) and tax payments by quarter (3mo,2mo,3mo,4mo).  An hour or two...or more depending on how efficient you are in finding your details.

 

I've done it once for real, (and second time just as a test) and won't again unless the penalty gets over ~$50

BUT, that's just me.

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*