Prizes are considered taxable income regardless of whether the prize is in the form of cash, trips or merchandise. If you win a prize valued over $600, the sweepstakes or contest sponsor must report the value to you and the Internal Revenue Service on a Form 1099-MISC.You’re still supposed to report and pay tax on prizes under $600.f you win a prize valued over $600, the sweepstakes or contest sponsor must report the value to you and the Internal Revenue Service on a Form 1099-MISC. You’re still supposed to report and pay tax on prizes under $600.