Sports gambling winnings are taxable income and it is required to report the income on your tax return if the winnings were at least $600 or more at 300/1 or more odds. You will receive all applicable forms by January 31st of the tax year in question. If you do not receive a form that means you are ineligible to receive a W-2G form for the previous year. It is advisable to consult your personal accountant for all tax advice as it relates to gambling winnings.