Lottery winnings are subject to federal income taxes and may be subject to state taxes depending on the state where the ticket was purchased.
Some state lotteries are required to report winnings of certain values to the corresponding tax collecting agencies. In those states where state income tax applies, a percentage of certain prizes will be withheld for tax purposes, and all states are required to do the same for federal taxes on certain lottery winnings.
Check the corresponding state page on Lottery USA for more relevant tax information on lottery winnings.