How do progressive jackpots work in online casinos: the rules, read in three passes

How do progressive jackpots work in online casinos?

Progressive jackpots in online casinos work the way their rules say, and you do not have to guess how. Each part of the mechanism is written down, and under the Commission’s RTS 9 standard the rules must be available before you stake.

There are four parts. ① Funding is where the pool comes from. ② Trigger is what has to happen for it to be paid. ③ Eligibility is which stakes count. ④ Payment is what happens after a win.

The Gambling Commission’s standard for these systems is RTS 9. Its requirement 9A says an explanation of the jackpot rules ‘must be clearly available to the customer before they commit to gamble’. So the rules exist before the first spin.

This page reads them in three passes: find and date the rules, read the four parts in order, then write down what the rules leave out.

Sources: Gambling Commission: RTS 9.

Pass 1 — find the rules the jackpot actually runs on

Start with the right document. RTS 3 guidance says explanatory content can sit in a game’s artwork, in ‘help’ or ‘how to play’ pages, or in other supporting material.

The same guidance lists whether there are contributions to jackpots, and how the jackpot operates, as items to consider including. So the place to look is the rules or help screen inside the game.

A lobby page about the jackpot is not the same document. It can be accurate and still leave out the clauses that settle a dispute. Treat it as an index, and the in-game rules as the source.

Write three things at the top of your notes: the operator, the game’s name and the date you read it. Rules change, and a clause is only as current as the day you saw it.

Sources: Gambling Commission: RTS 3.

① Funding — where the pool comes from

The Commission’s definition of terms calls a progressive jackpot ‘an incremental prize that increases as a result of contributions from the monies staked within a game from pre-set base value’. Put simply, part of each stake goes in, and the pool starts from a set amount.

RTS 9A guidance says the rules ‘shall describe how it is funded, what the start-up seed and any ceiling values are’. Where there is a ceiling, the rules should explain how later contributions are handled, for example through an overflow or reserve pool.

Here is one real example. Virgin Games’ Daily Jackpot terms, read on 23 September 2026, say a small percentage of every bet goes into a pot. The larger part grows the jackpots; the smaller part adds to a seed fund, which is the minimum prize.

The same terms put the seed at £1,000 for the Daily and Hourly Jackpots and £200 for the Quick Hit Jackpot. They also say there is no limit to the value of these jackpots. They do not give the percentage taken from each bet.

Every eligible spin funds the pool whether or not it wins, and the counter is designed to be watched. If watching it is why the next spin happens, GamCare’s helpline is 0808 8020 133.

Sources: Gambling Commission: RTS definition of terms; Gambling Commission: RTS 9; Virgin Games: Daily Jackpot Slots; Gambling Commission: self-exclusion; GamCare: talk to us now.

② Trigger — what the terms say has to happen

The trigger is the event that awards the pool. RTS 9A guidance says the rules shall describe how prizes are determined and awarded. That includes what happens when two or more players trigger the same jackpot at once, or appear to, for example because of network latency.

In the Virgin Games terms, one tier can be won when three Jackpot symbols land on the reels, and prizes may also come from in-game features. The terms say the prizes are ‘initiated at random’. The Daily and Hourly Jackpots must also be won before a stated time.

On simultaneous wins, the same terms state: ‘The same jackpot cannot be won by two players simultaneously’. If two wins land close together, they are credited in the order they were won. That is exactly the kind of clause the second pass is looking for.

A deadline like that sets when a pool has to be paid. Our page on must-drop jackpot limits sets out what a clock or an amount cap can and cannot tell one player.

Sources: Gambling Commission: RTS 9; Virgin Games: Daily Jackpot Slots.

③ Eligibility — the stakes that count and the ones that do not

Eligibility decides whether your stake could win the pool at all. RTS 9A guidance says that if a player is not eligible for a game’s progressive jackpot prize, this should be made clear, along with their theoretical RTP.

RTP means return to player: the share of stakes a game is designed to pay back over a very large number of plays. An ineligible player is playing for a different RTP, and the rules should say what it is.

RTS 9B guidance adds two lines. A customer who contributes to a pool should be eligible to win it while playing that game. And ‘The chances of winning a jackpot should increase in correlation with the amount contributed’.

The Virgin Games page shows why this part needs care. Its main copy says you have ‘the same shot at the jackpot prize’ at 20p or £20 a spin. Its Daily Jackpot Terms say ‘the bigger your bet size, the more likely you are to win’.

Those two lines describe different models, and the page does not reconcile them. We have not tested the game, so we do not pick one. Record both, with the date, and check the rules inside the game.

Where a game asks you to opt in to a jackpot for an extra amount per spin, our page on an optional network jackpot contribution works out what that adds to your total stake.

Sources: Gambling Commission: RTS 9; Virgin Games: Daily Jackpot Slots.

④ Payment — notification, reset and where the money goes

RTS 9B guidance says the system shall notify a winning customer immediately after a jackpot is triggered. Other players must be adequately notified of the reset value. Under 9A, the displayed value should be updated as often as practicable, particularly after a reset.

The Virgin Games terms say a win is credited directly to the user wallet, even if it triggers during a bonus spin. They also warn that the jackpot value displayed may be different from the actual value.

A switched-off jackpot is part of payment too. RTS 9B says contributions in a decommissioned pool should be returned fairly, with priority to the players who made them. Its examples are waiting for the next award, moving the money to another jackpot, or a one-off return with disclosure.

None of this sets a withdrawal time. Identity checks and payment processing sit outside RTS 9, and our note on how progressive jackpots are paid out shows where that line falls.

Sources: Gambling Commission: RTS 9; Virgin Games: Daily Jackpot Slots.

Pass 3 — write down what the rules leave out

The third pass is a list of silences. A silence is a finding, so record it with the date rather than filling the gap with a guess.

Check the units first. The figure on screen may be cash, another currency or a game-specific unit, and the rules should say which. If they do not, leave that line visibly unresolved.

The parts list below is the result of all three passes on one real product page. It shows what a finished reading looks like, gaps included. For the wider picture of pools, triggers and prizes, see our guide to online casino jackpot rules.

Sources: Virgin Games: Daily Jackpot Slots.

How to read a jackpot’s rules in three passes

The steps below are the whole method on one screen. Keep a note open beside the game while you work.

The same four questions answer how do progressive jackpots work in online casinos for any jackpot, whichever operator runs it. Only the answers change.

Sources: Gambling Commission: RTS 3; Gambling Commission: RTS 9.

A worked summary, with invented amounts

The last step is a short summary in your own words. Use invented amounts and label them as illustrative, so no one mistakes them for a real pool.

For example, and the amounts here are made up: a pool starts at a £500 seed. Eligible stakes add to it until it shows £2,300. The trigger in the rules awards it, and it resets to £500.

That summary describes money moving, and nothing else. It says nothing about when the next award comes, and it suggests no way to force one. If a line in your summary starts to sound like a prediction, cut it.

What the counter cannot tell you

A jackpot counter shows the pool’s current size. RTS 9A asks for it to be kept up to date, especially after a reset. That is a display duty, not a forecast.

The counter does not show the trigger, your eligibility or the payment route. Those three parts live only in the rules. Our page on why a jackpot counter is not a probability takes the display apart in more detail.

Choosing not to stake at all is always a valid result of reading the rules. The four parts are worth knowing either way.

Sources: Gambling Commission: RTS 9.

Terms read 23 September 2026

Seven pages were opened on 23 September 2026. Every clause and figure above comes from one of them, or is marked as an invented example.

RTS 9 supplied the four parts, the eligibility and correlation lines, the notification duty and the switch-off routes. RTS 3 supplied where explanatory content can sit. The Commission’s definition of terms supplied what a progressive jackpot is.

The Virgin Games Daily Jackpot Slots page supplied the operator example, and the public register showed its operator, Gamesys Operations Limited, holding an active remote casino licence that day. The Commission’s self-exclusion page and GamCare’s support page supplied the helpline number.

We did not open the in-game rules, stake, deposit or withdraw anything to write this page. The £500 and £2,300 in the worked summary are invented.

Sources: Gambling Commission: RTS 9; Gambling Commission: RTS 3; Gambling Commission: RTS definition of terms; Virgin Games: Daily Jackpot Slots; Gambling Commission register: 38905; Gambling Commission: self-exclusion; GamCare: talk to us now.