The games

Where a jackpot pot comes from, and what it costs the base game

A progressive jackpot is funded by a slice taken from every stake played on the network, which means the published return of the game already has that slice removed from it while the pot is small.

A pot funded out of every stake

A «progressive jackpot» grows because a slice of every stake played on «the network» goes into it rather than into the game's own return; the slice is small (usually under two per cent), and it comes out of the figure the game publishes, which is why the published return of a progressive slot is lower than a comparable game without one. That is the whole mechanism and it has one important consequence. While the pot is small, a progressive game is a worse bet than its non-progressive equivalent, because you are paying the contribution and the pot is not yet large enough to compensate; as the pot grows, the position reverses.

The three shapes a jackpot comes in

A standalone jackpot is funded by one machine's own play and is small and frequent. A local jackpot pools the play of one operator's copies of the game. A network jackpot pools every operator's copies, which is how the very large pots are built and why they are built by a studio rather than by a casino. The fourth category, which is newer and much more common in British lobbies, is the must-drop jackpot: a pot that is guaranteed to be won before a stated time or a stated amount, and it is a different product from a true progressive, because the guarantee changes the arithmetic of waiting, and it is usually much smaller.

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What winning one actually involves

On most network progressives the jackpot is not won by a combination on the «paytable» but by a separate random event, often a «bonus wheel» reached at random, and the probability of reaching it is usually proportional to the stake. That proportionality is the detail that matters: on many progressives a «minimum stake» does not qualify for the top tier at all, and the terms say so in a sentence near the end.

Payment is the other practical question, and it differs by game. Some pay in a lump, some in instalments, and a few are subject to a cap imposed by the operator rather than by the studio, which is a term worth reading before rather than after.

Whether any of it is worth doing

The honest answer is that a progressive is a worse-than-average game most of the time and a better-than-average one occasionally, and that the moment of reversal is calculable only if the studio publishes the contribution rate and the seed, which most do not. What a player can do is notice that a pot well above its historical average is a different proposition from one just after a drop, and the second honest answer is that the appeal is not arithmetical and does not need defending as though it were. A pound on a jackpot game buys a very small chance of something that would change a life, and nobody buying it is confused about the odds!

Questions readers ask

Why is the return lower on a jackpot slot?

Because the jackpot contribution comes out of the same stake. A slice of every bet, usually under two per cent, goes into the pot instead of into the game's own payouts, which is visible in the published figure if you compare a progressive with a non-progressive version of the same game.

Does a bigger stake improve my chance at the jackpot?

On most network progressives, yes, because the chance of reaching the jackpot event is proportional to the stake, and on several of them a minimum stake does not qualify for the top tier at all. The terms say which, usually in a single sentence.

What is a must-drop jackpot?

A pot guaranteed to be won before a stated time or a stated value, which changes the arithmetic of waiting and is usually far smaller than a true network progressive. It is a different product wearing the same word.

Is the jackpot paid in one go?

It depends on the game and occasionally on the operator. Some pay a lump sum, some pay in instalments, and a few are subject to an operator-imposed cap that sits in the terms rather than in the game, which is worth reading before playing rather than after winning.

By the UK Pound Casino editorial team · Last updated November 2026 · Online since 2026