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How Lottery Jackpots Grow and Roll Over
A jackpot usually grows when no ticket matches the top-prize combination and the prize pool rolls into a future drawing.
Important: Lottery availability, age requirements and online-purchase rules vary by jurisdiction. This page is general information, not legal or tax advice.
Advertised jackpot
US jackpot games often advertise an annuity-based amount rather than the immediate cash value. The exact relationship changes with sales and financial assumptions.
Cash vs annuity
Powerball and Mega Millions both publish cash and annuity concepts for jackpot prizes. The annuity is paid over time; the cash option is a lower immediate amount based on the prize pool and market factors.
Why jackpots accelerate
High jackpots can increase ticket sales, which can add more money to the prize pool and speed growth between drawings.
Do not chase rollover size
A larger jackpot does not make any single ticket more likely to match the winning combination.