I live in the United States, this is my first year paying estimated income tax and I've missed the first two voucher deadlines.
My question is should I mail them now (late) and send each one separately all at once? Or lump the total for the three vouchers onto the September voucher (ignoring/amending the amount listed on the voucher)? Or is there some other way this is typically handled?
I'd imagine this is a fairly common scenario but searching online I was only able to find information about penalties and such, but nothing definitive about how to actually handle missed payments.