This is by far, the most commonly asked question right now.
CNN posted an article today and I verified on the IRS FAQ Section of their stimulus page that if you OWED the IRS money in 2018 and 2019 the IRS will NOT use that account to send the stimulus check. Per the IRS Site:
“No, the IRS will not send Payments to accounts used to make a payment to the IRS. After you properly verify your identity, the Get My Payment tool will allow you to submit your bank account information if your Payment has not been processed. Providing your bank information is the fastest way to receive your Payment. If we do not have bank information for you, your Payment will be mailed to the address we have on file for you.
SO, go to https://www.irs.gov/coronavirus/get-my-payment to get that payment faster!