IRS notices should never be ignored. Regardless of what the notice says, the questions raised should be addressed in writing. If you do not understand the notice, it is important that you bring it to the attention of a tax professional immediately. You do not want to risk loosing valuable legal rights and/or having forced collection action waged against your business. After the requisite amount of notices, the IRS may levy the bank account and/or garnish accounts receivable and the like.