On April 12th, the Financial Crimes Enforcement Network published new final rules replacing a requirement that mutual funds file IRS/FinCEN Form 8300, Report of Cash Payments Over $10,000 Received in a Trade or Business, with a requirement to file FinCEN Form 104, Currency Transaction Report. Both forms document a transaction in currency above $10,000, but differ in some technical aspects. FinCEN Press Release.