After you file

@JQ73 - I really wouldn't be too concerned.  The tax brackets were adjusted by about 2.5%, so whatever is the estimated tax on Line 44F, reduce it by 2.5%. 

 

if you want the math to work down the rest of the sheet, take 2.5% of line 44F and add the result to the payments lineon 64a

 

that should be close enough.

 

This is just an estimate in any event; perfection is not the objective.