I duplicated my Q2 estimated taxes on EFTPS. Can the overpayment be applied to Q3? I don't see anywhere to do that on EFTPS. So if i Pay nothing in Q3, I will be where I should be due to the duplicated Q2 payment. If I pay nothing in Q3 and pay my regular amount in Q4, would I be penalized for a $0 payment in Q3, even though the IRS has the total estimated tax due for Q1-3? I called EFTPS and they don't know how to apply my overpayment to Q3 and told me to call the main IRS number, which of course the message told me to try again later.
