Taxes are due on April 18th this year, which is a Tuesday. In this case, I will owe money to the IRS and will want them to deduct the funds from my checking account on the 18th. If I file electronically using TaxAct or one of the other online tools, what is the latest I can do the final submit in the program to assure the IRS will have time to get the funds without charging any interest? On the online submission, you do get to specify the date you want the funds taken out, but if I wait until the 18th to do the submission, I don't see how they could still take the funds out on the 18th.
Or does it work the way it does with paper returns? In the case of a paper return, I can mail it on the 18th and only need a postmark with that date. If it takes a week to physically get to the IRS, it doesn't matter. Does it work the same way with online submissions? That is, is it ok if I do the submit any time on the 18th (before midnight) or do I have to do it a day or two ahead?