The gambling winnings have to be reported regardless if you can itemize your deductions or have to take the standard deduction. Do not start the amended return until you have received the tax refund or the taxes owed have been processed by the IRS after the tax return was accepted by the IRS.
See this TurboTax support FAQ for amending a 2016 tax return - https://ttlc.intuit.com/questions/3061514-how-do-i-amend-a-2016-return-in-turbotax
Gambling winnings are reported on Form 1040 Line 21 as Miscellaneous Income.
To enter, edit or delete Gambling Winnings and Losses -
- Click on Federal Taxes (Personal using Home and Business)
- Click on Wages and Income (Personal Income using Home and Business)
- Click on I'll choose what I work on (if shown)
- Scroll down to Less Common Income
- On Gambling Winnings, click the start or update button
Or enter gambling winnings on w-2g in the Search box in the upper right of the program screen. Click on Jump to gambling winnings on w-2g
