如果贏夠多,賭場當場要你的ssn填W-2G表,這個表和工資的W-2一樣,是報到IRS的。賭場還有可能會withhold你的收入稅。
http://www.irs.gov/newsroom/article/0,,id=108277,00.html
"...the payer is required to issue you a Form W-2G. If you have won more than $5,000, the payer may be required to withhold 25 percent of the proceeds for Federal income tax. "