@Hal_Al I thought money received through August 31 was the cutoff for calculating the Sept 15 estimated payment (I assume that is what you meant by "3rd quarter'). So the 'third quarter" would be June 1 through August 31st.
Any income received in September would impact the January 15, 2024 estimated tax payment, right?
Q1 = January 1 - March 31 (April 15 estimated payment)
Q2 = April1 - May 31 (June 15 estimated payment)
Q3= June 1 - August 31 (Sept 31 estimated payment)
Q4 = Sept 1 - December 31 (January 15 estimated payment)
