MUSL and its members accept all investment risk and are contractually obligated and liable to the winner to make all scheduled payments to annuity winners. If a jackpot ticket is not claimed, the funds in the prize pool are returned to members in proportion to the amount they contributed to the prize pool. The members have different rules regulating how unclaimed funds are used.[2]
1:09 am – Mega Millions: There were no jackpot winners and no $1,000,000 winners in the Tuesday, October 2, 2018 Mega Millions drawing.  For the complete rundown of winners in each of the other prize categories, a list of the California pari-mutuel prize amounts, the drawing video, and all other data about this drawing, see the Mega Millions Drawing Detail page.
Jackpot winners have the choice of receiving their prize either in one single lump sum payment, or once a year with the annuity option (30 payments over 29 years). They have 60 days to decide which way they want to be paid. During these 60 days, a player who originally opted for the annuity payment is able to instead take the lump sum payment option. If they do not make a choice either way, after 60 days, the player will automatically receive their prize as an annuity.
The minimum jackpot prize is a $15 million annuity disbursed in 30 payments over 29 years which is something many people would elect to do.The 30 annuity payments are not equal but based on an increasing rate schedule. For example, the first annual gross annuity payment on the base $15 million jackpot would be approximately $267,000 while the final payment would be approximately $834,000.
In Georgia, New Jersey, and Texas, players must choose, in advance, whether they wish to collect a jackpot prize in cash or annuity. Georgia and New Jersey winners can change an annuity ticket to cash should they be eligible for a jackpot share; however, the choice is binding in Texas. The other Mega Millions members allow the cash/annuity choice to be made after winning (usually 60 days after claiming the ticket), although in Florida the 60-day "clock" starts with the drawing in which the jackpot prize was won.
Mega Millions' second-largest jackpot, $648 million, was for the December 17, 2013 drawing. Two winning tickets, one each from California and Georgia, were sold. The holder of the Georgia ticket claimed the next morning; they selected the cash option, which amounted to $173,819,742.50 before withholdings. The holder of the California ticket claimed on January 3, 2014. (The California ticket holder received an equal share, but potentially a larger cash-option amount, as California lottery winnings are exempt from state income tax)."[3][4][5][15] [16]
On January 13, 2016, the world's largest lottery jackpot, an annuity of approximately $1.586 billion, was split among three Powerball tickets in Chino Hills, California, Melbourne Beach, Florida and Munford, Tennessee, each worth $528.8 million. Since there is no income tax in Florida or Tennessee (and California does not tax lottery winnings), the cash option after Federal withholdings is $187.2 million each.[32]
1:09 am – Mega Millions: There were no jackpot winners and no $1,000,000 winners in the Tuesday, October 2, 2018 Mega Millions drawing.  For the complete rundown of winners in each of the other prize categories, a list of the California pari-mutuel prize amounts, the drawing video, and all other data about this drawing, see the Mega Millions Drawing Detail page.
This method specifically has faced criticism recently from a number of lottery organizers such as Camelot, the UK National Lottery organizers who are not happy with companies “selling tickets” (selling bets on outcomes of their established lottery draws) for prices sometimes even cheaper than Camelot themselves sells their tickets. This legal and corporate dispute looks set to continue for the foreseeable future, in the mean time you can continue to buy Powerball tickets online, only now you are aware of the key differences between the two business models. 
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