A sale in June would mean an estimate in Sept.
Quarterlies are not exactly quarterly ... https://www.irs.gov/pub/irs-pdf/f1040es.pdf
Q1 1/1 thru 3/31 paid on 4/15
Q2 4/1 thru 5/31 paid on 6/15
Q3 6/1 thru 8/31 paid on 9/15***
Q4 9/1 thru 12/31 paid on 1/15 of the next year
