What is the time frame in which an IRS audit can reach back?

It largely relies on the findings made by the IRS in the initial audit. Usually, the IRS has the authority to scrutinize tax returns from the past three years. Nonetheless, if an error is discovered during the audit, the IRS can look back up to six years. There are uncommon instances where they might delve even further back, but exceeding the six-year limit is atypical.