Why did IRS not take the tax I owe from my bank?

Hi.  I filed my taxes and owe money.  I asked the IRS to deduct the money from my bank account on March 30th, but so far they have not.  I just checked my bank account info on my return and it is correct.  I received my state refund a few days after I filed but the IRS has not taken the money I owe.  Any ideas why?