Thanks so much for this! So last year I paid my estimated taxes in late August, then Sept and then Dec. I paid enough to get a refund of $1000 at year end. They accessed a penalty of $90 dollars based on dates past the assigned dates you indicated. The letter was based on days from those dates. This year I am paying on those dates but the payments are based on what I made at that time because my job can end at anytime. So the payments are not equal. My pension and Social Security have the taxes paid each month thru the W4 withholding. Is this approach ok? Thanks again for answering my question!
