Heads up! Deadline for filing your 2020 tax return and paying anything due is May 17, 2021 BUT if you are paying estimated quarterly taxes for 2021, that first quarter payment is still due by April 15th 2021.
BUT, if you will be owed a refund of more than your required quarterly payment, will that avoid penalty if you wait? As I recall, using part of a refundable amount to pay part or all of the Estimated Tax is allowed ordinarily.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
I truly don't know. Of the half dozen returns I prepare each year there is only one who does quarterly estimated and we will calculate his actual tax amount before April 15 so he submits enough as estimated.