major types of audits performed in the united states today?

Answer 1

The most common type of audit would be the statutory audit required by SEC registrants (listed entities). Then there are internal audits outsourced to audit firms, specialty audits like Sarbanes-Oxley compliance audits, revenue audits (some rentals and royalties are tied to turnover or revenue earned), schools audits, jackpot machine audits in clubs, and forensic audits once fraud is suspected.