An IRS levy is a one shot deal--meaning, they take what you have in the account at the time the levy. If it's not enough, they can come back later...but the levy doesn't remain active until the balance is paid (like wage levies do). As it turned out, I found the answer to my own question today after talking to both the IRS and the bank. The IRS sent the Form 668 to the bank a week before they sent me the form 8519...and, for whatever reason, the bank still hasn't received it. They also haven't received the mailed release (which is to be expected given the other delay). However, the IRS was kind enough to fax it over to them this morning, so the release has been posted and when and if the levy arrives at my bank, it won't be processed.