The IRS will levy only after these three requirements are met:

1. IRS assessed the tax and sent you a Notice and Demand for Payment;
2. You neglected or refused to pay the tax; and
3. The IRS sent you a Final Notice of Intent to Levy and Notice of Your Right to A Hearing (levy notice) at least 30 days before the levy. The IRS may give you this notice in person, leave it at your home or your usual place of business, or send it to your last known address by certified or registered mail, return receipt requested.

Usually the levy only occurs if an installment payment plan is not set-up or the taxpayer does not make payments.