If you are not a professional gambler, gambling winnings must be reported as “other income” on Line 21 of Form 1040. You cannot reduce the winnings by your losses for the year.
Losses from gambling are deductible only up to the amount of gambling winnings. You may not deduct a net gambling loss even though a particular state says gambling is legal. Nor does it matter that your business is gambling. You may not deduct a net loss from wagering transactions even if you are a professional gambler (see below).
If you are not a professional gambler, the gambling winnings included on Form 1040 as “other income” (Line 21) may be offset by gambling losses if you itemize deductions. Gambling losses (not exceeding the amount of the gains) are deductible on Schedule A as a miscellaneous deduction (Line 28) that is not subject to the 2% AGI floor (19.1). Keep records that document your losses in case your return is questioned by the IRS.
According to the Supreme Court, a gambler is considered to be engaged in the business of gambling if he or she gambles full time to earn a livelihood and not merely as a hobby.
A professional gambler reports winnings and losses (lost wagers and gambling transaction expenses) on Schedule C. However, the Tax Court and federal appeals court have consistently held that lost wagers from gambling are deductible only to the extent of wagering gains even if the gambling activity is a business. The specific statutory limitation on gambling losses trumps the general statute allowing full deductibility for ordinary and necessary busines expenses.
Gambling-related expenses other than lost wagers are not limited to gambling winnings. At one time, the IRS argued that the limit did apply, but in 2011 it agreed to follow a Tax Court decision that allowed a horse-race gambler to fully deduct as a business expense his gambling-related car expenses, admission fees, meals, subscriptions, and horse-handicapping data.
According to the IRS, a casual slot machine player on a day trip to a casino determines gain or loss at the end of slot play, disregarding the winning and losing bets along the way (Chief Counsel Advice 2008-011). Gains on the winning days during the year must be reported as gross income and the losses on the losing days are deductible only if the taxpayer itemizes deductions and only to the extent of the reported winnings (claimed as miscellaneous deductions not subject to the 2% floor). The Tax Court has repeatedly rejected attempts by casual gamblers to net gambling gains and losses realized at different times. See Example 1 below for a Tax Court decision that adopts the IRS method on the way casual slot machine players should report gambling gains and losses.
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