Gambling
winnings are considered income in the US by state and federal
governments. US federal law requires that all casinos issue a tax
declaration form for slot machine winnings of $1,200 or more, and for
keno winnings of $1,400 or more. US citizens are required to report all
winnings when filing their annual income-tax report.
The
Casinos
The
casinos are required to ask for your name, address, social security
number, and positive identification, and then they will issue the tax
form. Before the casino gives any winnings, you are asked to sign a
statement that says that they will pay all the required taxes.
No
taxation on gambling. 
Gambling
winnings are considered income in the US by state and federal
governments. US federal law requires that all casinos issue a tax
declaration form for slot machine winnings of $1,200 or more, and for
keno winnings of $1,400 or more. US citizens are required to report all
winnings when filing their annual income-tax report. 
The
casinos are required to ask for your name, address, social security
number, and positive identification, and then they will issue the tax
form. Before the casino gives any winnings, you are asked to sign a
statement that says that they will pay all the required taxes.