The information is available for you in the Filing Instructions document (or Electronic Filing Instructions document) which prints out as part of your tax return paperwork. The tax payment method (payment date, account number, etc) will display on the page, at the top of the Balance Due/Refund section.
I verified my account information was all correct, the state transaction went through fine using the same info. However it has been 6 days past the date requested for payment and the IRS has not made a deduction.
Usually, the IRS will withdraw the amount on the day you selected. If that date happens to fall on a weekend or federal holiday, the funds are typically withdrawn the next business day. But there seems to be some delay with the IRS withdrawing the funds. Please be aware that this year you have until May 17th to pay your balance due. Also, there will be no penalties or interest if the IRS failed to make the debit on time as long as the request was done correctly on a timely filed return. Please see When will my tax payment go through? for additional information.
Also, you can view your balance and check your payment activity at IRS Paying Your Taxes.
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