What is a Tax Audit? Once you file your income taxes, the IRS will review all the forms you submit (your tax return) and either accept your submission or reject and return it to you for a correction, usually with very little turnaround time. This can happen whether you are paying what you owe or receiving a refund. However, occasionally the IRS will decide to “audit” your tax return, asking you to provide some supporting documentation before your tax return is accepted.