with tax filing and paying A critical step in tax administration is the prompt detection of taxpayers who fail to submit tax returns (stopfilers) and taxpayers who fail to calculate correctly their tax liability on their tax return or make timely payment (delinquent taxpayers). A key role of tax administration is to ensure that if the taxpayer fails to comply, something is going to happen--a notice will be sent, significant interest and penalties will be applied, and other actions taken. It is important to convey the impression that, in this area, big brother is