Tax check is a process of verifying the accuracy of tax returns and payments. An AUDIT is an in-depth review of a taxpayer's financial records to ensure that all taxes have been paid correctly. It is conducted by a professional auditor who has the authority to examine documents, ask questions, and make adjustments to the taxpayer's return if necessary. The purpose of an AUDIT is to ensure that the taxpayer is paying the correct amount of taxes and not underpaying or overpaying.