If you gamble, be sure you understand the tax consequences. Both wins and losses can affect your income tax bill. And changes under the Tax Cuts and Jobs Act (TCJA) could also have an impact. Wins and taxable income You must report 100% of your gambling winnings as taxable income. The value of complimentary goodies (“comps”) provided by gambling establishments must also be included in taxable income as winnings. Winnings are subject to your regular federal income tax rate. You might pay a lower rate on gambling winnings this year because of rate reductions under the TCJA. Amounts you win may be reported to you on IRS Form W-2G (“Certain Gambling Winnings”). In some cases, federal income tax may be withheld, too. Anytime a Form W-2G is issued, the...