IRS Form W-2G is an Internal Revenue Service document sent to gamblers to report their winnings and the amount that was withheld for taxes at the time of the payout.

IRS Form 8832, "Entity Classification Election," is a form business owners use to tell the IRS how to classify a business for federal tax purposes.

IRS Form 941 is a form businesses file quarterly to report taxes they withheld from employee paychecks. Filing deadlines are in April, July, October and January.

IRS Schedule K-1 is a document used to describe the incomes, losses, and dividends of a business's partners or an S corporation's shareholders.