Progressive jackpots explained

Progressive jackpots explained: what makes the pot grow

A progressive jackpot is a prize that is not fixed in advance. Every time someone places a qualifying bet on a linked game, a small percentage of that stake is set aside and added to the pot. Because thousands of spins can feed the same pot, the figure you see on screen climbs steadily, sometimes by pennies a second. When one player triggers the jackpot, the whole pot is paid and the counter drops back to a seed amount that the game supplier or casino puts up to restart it.

That is the key difference from a fixed jackpot, which pays a set amount or a set multiple of your stake every time it lands. A fixed top prize on a slot with a 5,000x maximum pays £500 on a 10p spin whether it lands today or next year. A progressive pot can be worth £2,000 on Monday and £2,600 on Friday simply because more people played in between.

Where does the money come from? From the players. The jackpot is not a gift from the casino: it is the pooled contribution of everyone who played the game and did not win it. To fund the pot, the regular paytable on a jackpot slot is usually a little meaner than on a similar non-jackpot game, which is why understanding the return to player of these games matters before you play them.

A worked example of how a jackpot pot builds

Suppliers rarely publish the exact contribution rate, so the numbers below are illustrative. They show the mechanism, not any specific game. Imagine a slot where 1.5% of each qualifying stake goes into the progressive pot and the seed is £10,000.

On a single £1 spin in that example, 1.5p feeds the pot and the remaining 98.5p is played against the normal paytable. Across a session of 200 spins at £1, you would contribute about £3 to a prize you are very unlikely to win. That contribution is part of your expected cost of play, alongside the ordinary house edge.

A bigger pot does not mean the jackpot is closer to dropping. On a standard progressive, each spin has the same trigger chance whether the counter shows £20,000 or £2,000,000. Thinking otherwise is a version of the gambler’s fallacy.

Types of progressive jackpot at UK online casinos

Not all progressives are built the same way. The size of the pot depends mainly on how many players and casinos feed it.

A jackpot network explains why the same headline figure can appear at two unrelated casinos: both are connected to the supplier’s shared pot. Large suppliers run their own networks. Playtech is best known for its Age of the Gods jackpots, and Relax Gaming launched its Dream Drop network in 2022. Red Tiger is associated with daily drop jackpots that must pay within a set window.

How must-drop jackpots differ

A must-drop jackpot is still progressive, but it carries a deadline or a ceiling. If a daily pot must drop before midnight, it will be won by someone that day. That makes the timing predictable, but it does not make your chance meaningfully better: thousands of other spins are competing for the same pot in the same window.

How a progressive jackpot is triggered

The trigger is set by the game’s design and decided by its random number generator. Common methods include:

• A random trigger that can fire on any qualifying spin, with no special symbols needed.
• A jackpot wheel or bonus game: a feature is triggered first, then a bonus wheel or pick game decides which tier, if any, you win.
• A symbol combination, such as five jackpot symbols on a payline, sometimes only at the maximum coin level on older games.
• A collection mechanic, where filling the screen in a hold-and-win round awards the top tier.

In many modern jackpot slots the chance of triggering the pot rises in proportion to your stake: a £2 spin may have roughly twice the chance of a £1 spin. That sounds like an argument for staking more, but per pound staked the chance is the same, and so is the expected loss. The random number generator does not track how long since the last win, who is playing, or how big the pot has become.

Older games sometimes made the jackpot available only at certain stake levels. If the help screen says a minimum bet is needed to qualify, a smaller bet still contributes to the cost of the game without giving you a shot at the top prize. Read that rule before spending anything.

Jackpot slots and RTP: where the money goes

The published RTP of a jackpot slot is usually a combined figure: part comes from the base game and features, and part comes from the jackpot contribution. Because the jackpot is won so rarely, almost every player experiences only the lower, non-jackpot share of that return during normal sessions.

Casinos can run different RTP versions of the same game, so the live figure is the one shown in the game’s help screen at your casino; our guide to checking RTP shows where to find it. As a rough comparison, £100 of total stakes on a game returning 88.12% has an expected cost of about £11.88, while the same £100 on a 96% game has an expected cost of about £4. That gap is the price of the bigger prize, and most players pay it without ever winning the pot.

The base game’s volatility varies: Mega Fortune is usually rated low to medium and Mega Moolah medium. Whatever the rating, the jackpot itself is an extreme long shot layered on top, so a game can feel steady in everyday play while holding back a share of every stake for a prize few players will ever see.

What are the odds of winning a progressive jackpot?

Suppliers seldom publish trigger odds for top-tier progressive jackpots, so any precise figure you read online should be treated with caution. What can be said with confidence is that the top tier of a large network pot lands very rarely compared with the number of spins played, and the lower tiers land much more often. That is how a game can show a seven-figure top prize while paying small Mini prizes many times a day.

Think of the top tier like a lottery ticket attached to each spin. The ticket costs you a slice of every stake, and its expected value is already counted in the RTP. You cannot improve it by timing your play, choosing a quiet hour or switching casinos within the same network. Our explainer on whether slots pay more at night covers why timing makes no difference.

Progressive jackpots explained: the UK rules that apply

Jackpot slots are online slots, so every Great Britain rule for slots applies to them in full:

• Stake limits: no more than £5 per spin for players aged 25 and over since 9 April 2025, and £2 per spin for 18 to 24-year-olds since 21 May 2025. The Gambling Commission’s online slots stake limit guidance (opens in a new tab) sets out how the limit applies per game cycle.
• Speed and autoplay: since 31 October 2021, each spin takes at least 2.5 seconds and autoplay is banned, so you cannot set a jackpot game to spin unattended.
• No celebrating losses: a return equal to or below your stake cannot be dressed up with win sounds or animations.
• Demo play: free-play versions can only be opened after age verification, a rule in place since May 2019.
• Tax: UK players do not pay tax on gambling winnings, jackpots included; see our page on gambling winnings and tax.

On payment, the Commission’s page on what to do if you can’t withdraw your winnings (opens in a new tab) says you should be able to withdraw without unreasonable delay and should not be made to take money in instalments. A casino may still need to complete checks it is entitled to make, so a very large withdrawal can take longer to approve than a routine one.

What happens after a jackpot win

The exact process depends on the casino and supplier, but a win usually follows this order:

1. The game announces the win and the amount is credited to your casino balance, in line with the game rules.
2. For network jackpots, the supplier funds the payout and settles it with the casino behind the scenes.
3. The casino may review the account, confirm your identity is fully verified and, for large sums, ask about the source of funds you deposited.
4. You request a withdrawal to a method you have already used, following the casino’s closed-loop rules.
5. Once approved, the payment time depends on the method, so check the casino’s published withdrawal times.
6. Consider taking a break or setting a lower limit after a large win: the urge to keep playing with house money is common.

Our guides to withdrawing casino winnings and what happens when you hit a jackpot cover the paperwork in more detail. Verifying your account early, before a big win, removes the most common source of delay.

How to judge a jackpot slot before you play

A few checks in the help screen tell you most of what you need:

1. Find the RTP and note whether it includes the jackpot contribution.
2. Check whether the jackpot is network, local or standalone, and whether it is must-drop.
3. Read the trigger rule: random, wheel, symbols or collection, and whether stake size changes the chance.
4. Look for a minimum qualifying stake and make sure it fits inside the £5 or £2 limit that applies to you.
5. Check the volatility rating, if shown, against the size of your budget.
6. Decide in advance how much you will spend, and stop when it is gone.

If you want a broader picture of the category, our overview of jackpot slots compares fixed, progressive and drop formats, and the slot features guide explains the reels and bonus mechanics that sit underneath the jackpot.

Budgeting for progressive jackpot games

Because the top prize is so unlikely, a sensible budget assumes it will not land. Here is a simple way to plan a session on a game with 2.5 seconds per spin.

Expected cost scales with the total you stake, not the stake per spin. Smaller stakes simply spread the same cost over more spins and more time. Our guide to setting a gambling budget goes further, and deposit limits set in your account are the most reliable way to stick to a plan. If chasing a jackpot has started to feel like a need rather than a pastime, the National Gambling Helpline run by GamCare (opens in a new tab) is free and open 24 hours a day on 0808 8020 133.

Where to play jackpot slots at licensed UK casinos

Play progressive jackpot games only at casinos licensed by the Gambling Commission, where the stake limits, game design rules and complaints routes above apply. The three brands below are UKGC-licensed. Their current welcome offers are not linked to progressive jackpots, so read the terms to see which games the offer covers.

• Coral Casino: 18+, new players, bet £10 on slots to get 100 free spins (10p each, selected games, accept within 48 hours, valid 7 days, no wagering on winnings). Some deposit types, including PayPal and Skrill, don’t qualify. See the latest Coral offer.
• PlayOJO: 18+, new UK customers excluding Northern Ireland, first deposit of £10 or more for 80 free spins on Big Bass Bonanza at 10p each, with winnings paid in cash and no wagering. More in our PlayOJO overview.
• Casumo: 18+, new customers, opt-in, 50% bonus up to £100 on a first deposit of at least £20, wager the bonus 10x within 7 days, max £5 per bet with an active bonus; game restrictions apply. Our Casumo bonus terms page explains which games count.

Terms apply to every offer and can change; offers were last checked on 5 October 2026. Gambling should be paid for out of spare money, and losses are the likely result over time. For more background, browse our full list of casino guides.

18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set deposit limits. Free, confidential help: National Gambling Helpline 0808 8020 133.