Generally, any person in a trade or business who receives more than $10,000 in cash in a single transaction or related transactions must complete a Form 8300, Report of Cash Payments Over $10,000 Received in a Trade or Business (PDF). Form 8300 is a joint form issued by the IRS and the Financial Crimes Enforcement Network (FinCEN) and is used by the government to track individuals that evade taxes and those who profit from criminal activities. Although the cash reporting requirements apply to many types of businesses, auto dealerships frequently receive cash in excess of $10,000 and are required to comply with the filing requirements.