The annuity factor, or the cost to fund an annuity prize, is another key component. The annuity factor is made up of interest rates for securities purchased to fund prize payments. The higher the interest rates, the higher the advertised Grand Prize. You might not realize that an economic reality like interest rates impact even the Powerball jackpot, but they do!

On October 13, 2009, the Mega Millions consortium and Multi-State Lottery Association (MUSL) reached an agreement in principle to cross-sell Mega Millions and Powerball in American lottery jurisdictions, with the two groups referred to as the "Mega Power Lottery"[7] by many users. The expansion occurred on January 31, 2010, as 23 Powerball members began selling Mega Millions tickets for their first drawing on February 2, 2010; likewise, 10 Mega Millions members began selling Powerball tickets for their first drawing the next day. Montana (joining Mega Millions on March 1, 2010) was the first jurisdiction to add either game after the cross-sell expansion. Nebraska (March 20, 2010), Oregon (March 28, 2010), Arizona (April 18, 2010), Maine (May 9, 2010), Colorado and South Dakota (the latter two on May 16, 2010) also have joined Mega Millions since the expansion.

On Jan 31, 2010, the date of the cross-sell expansion, Mega Millions and MUSL each added lotteries; eight Powerball members added Mega Millions by May. The Montana Lottery joined Mega Millions on March 1. Nebraska added Mega Millions on March 20; Oregon followed on March 28; Arizona joined Mega Millions on April 18; Maine added Mega Millions on May 9; Colorado and South Dakota joined Mega Millions on May 16. The U.S. Virgin Islands joined Mega Millions in Oct 2010.
Rules vary according to the applicable laws and regulations in the jurisdiction where the ticket is sold, and the winner's residence (e.g. if a New Jerseyan wins on a ticket bought near their workplace in Manhattan). Mega Millions winnings are exempt from state income tax in California; while Florida, New Hampshire, South Dakota, Tennessee, Texas, Washington state, and Wyoming do not have an income tax. On the other hand, some residents of New York City and Yonkers, New York pay three levels of income tax, as these cities levy income taxes.
The structure of the draw is one which regular lottery players will be very familiar with; players must pick 5 regular numbers from a pool with a total of 69 numbers and in addition to these regular number picks, you also choose one bonus ball (known as the Powerball) from a pool of 26. These two pools of numbers are mutually exclusive and remain completely separate throughout the drawing procedure. In order to jackpot the US Powerball, you need to match all 5 regular numbers and the Powerball. Do this and you are instant Powerball millionaire – it’s as simple as that!