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When playing online slots, the first thing we do before even thinking about pressing the spin button is check the payout percentage, also known as the Return to Player, in the game rules.
While slots may look the same on the outside, their inner workings may differ substantially. The heart of the slot is the mathematical model that determines how often and how big a prize you win.
A higher Return to Player means a more player-friendly math model, so you should prioritise seeking the best online slot payout percentages when playing at online casinos.
The Best Slot Payout Casinos
We have selected high-paying UK slot sites that offer the best slots from all the major providers, including Relax Gaming, Push Gaming, NetEnt, Play’n GO, Pragmatic Play, and many more.
Play real-money online slots with high payout percentages, reaching up to 99% payout.
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Welcome Offer: 200 Cash Spins on Fishin’ BIGGER Pots of Gold- Fun and pleasant atmosphere
- Over 4,200 slots with the highest RTPs
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New customers only. Up to 200 spins over 4 day period from first deposit & spend of £10. Max 50 spins each day on Fishin’ BIGGER Pots of Gold at 10p per spin for 4 consecutive days. Deposit & spend £10 each day for 50 spins. Spins credited upon spend of £10 each day. 18+ Full T&Cs apply.
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Welcome offer: 200 Cash Spins on Big Bass Splash
- Superb game selection
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Ad. 18+. Gamble Responsibly. Gambleaware.org. New players. Opt in & deposit £10 in 7 days & wager 1x in 7 days on any casino game (excluding live casino and table games) for 100 Free Spins. Wagering contributions vary. Free Spins worth 10p each on Big Bass Splash. 3 day expiry. 18+. Full bonus terms and conditions apply.
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Welcome offer: 70 Bonus Spins on Book of Dead
- Over 160 game studios
- Trusted payment methods
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18+. New players only. Welcome Offer is 70 Book of Dead Bonus Spins available with a min. £15 first deposit. Bonus Spins must be used within 10 days. Any winnings from Bonus Spins will be added as Bonus Funds. There are wagering requirements for players to turn these Bonus Funds into Cash Funds. This is 10 times the value of the Bonus Funds. Affordability checks apply. Terms apply. Please gamble responsibly. GambleAware.org
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Welcome offer: 77 Cash Spins Big Bass Bonanza
- Safe & reliable online casino
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- Good RTPs on NetEnt, Nolimit City and Thunderkick slots
18+ New UK players only | 23 No Deposit Spins Winnings Have 10x Wagering Requirements | Max Cashout on No Deposit Spins is £100 | Cash Spins Winnings Are Wager-Free | No max cash out on Cash Spins | Eligibility is Restricted for Suspected Abuse | Skrill Deposits Excluded | Spins Values Are £0.10 Per Spin | All Spins Expire in 48 hours |
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Welcome offer: Up to 100 free spins
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- Top RTPs on Pragmatic Play slots
- Over 2,400 slots
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New bettors only. Select bonus at sign-up. Deposit and stake £10 on Casino within 30 days. Max 100 free spins. Selected games only. Game & payment restrictions apply. T&Cs apply. 18+.
The Advantages Of Playing a High-Payout Slot Compared to a Low-Payout Slot
The higher the slot payout, the better your odds of winning. It’s as simple as that.
We have made some example calculations to illustrate the effect of playing an online slot with a high RTP versus a lower RTP.
The following table shows how many spins you theoretically get to play before your money runs out, based on a starting balance of £100 and a stake of £1 per spin.
In this example, we have compared slots with four different payout settings: 98%, 96%, 94%, and 92%. The cycle ends when the balance dips below £1.
| Payout% (Return to Player) | RTP rating | Number of Spins |
| 98% | Excellent | 4,950 |
| 96% | Good | 2,475 |
| 94% | Mediocre | 1,650 |
| 92% | Bad | 1,237 |
Higher payout slots = more spins and more chances to win big
As you can see, the 98% payout slot will give you more than 4 times the number of spins before your money runs out compared to the 92% payout version, quadrupling your playing time and the chances of winning big.
Top 10 Best-Paying Slots of All Time
These 10 online slots are the best payout slots online of all time and are a great place to start if you are looking for online slots that give you a better bang for your buck than other slots.
However, due to the unusually high payout percentages, you won’t find any free slot spins offers on these games.
Which online slots pay out the most? Here is CasinoWizard’s definitive list, which is continually updated.
1. Book of 99 (Relax Gaming): 99%
Book of 99 is our winner, as it’s the highest-paying online slot ever created.
The RTP is exceptionally high at 99%, but the volatility is still at the highest possible level (5/5), so play responsibly. While the slot offers players the chance to win up to 12,075x the bet amount, remember that the game can’t be used for bonus wagering as the RTP level is of this magnitude.
2. Mega Joker (NetEnt): up to 99%
One of the most popular NetEnt slot machines is Mega Joker. Old-fashioned fruit machine slots always do well, and that includes the internet. Moreover, Mega Joker has a fantastic payout rate. You do need to play with 10 credits per spin and consistently use the Supermeter.
3. Jackpot 6000 (NetEnt) – 98.90%
Jackpot 6000 is an online slot machine by NetEnt. The payout rate of the Jackpot 6000 slot machine runs to a maximum of 98.90%.
You must play the Supermeter whenever possible to maximise the maximum RTP. You play the Supermeter using the credits you won during the base. In other words, you need to play the Supermeter whenever you win to ensure the best possible odds.
4. 1429 Uncharted Seas (Thunderkick): 98.50%
1429 Uncharted Seas not only has an extremely high payout rate, but the slot also has an extraordinarily low variance. That means there are many prizes, but the rewards are not significant. Many casinos would consider you a cheater if you keep playing your bonus money on 1429 Uncharted Seas.
With the 1429 Uncharted Seas slot, Thunderkick takes you on a journey of discovery. On the ship, you’ll make your way through mermaids and sea monsters, and prizes come often.
5. Marching Legions (Relax Gaming): 98.12%
The game creator Relax Gaming has created many popular slots, some with very high RTP percentages. Marching Legions from 2020 is their second highest-paying slot and 5th on our list.
6. Pearl O Plinko Mermaid Cove (Quickspin): 98.10%
Pearl O Plinko Mermaid Cove from Quickspin is part slot machine, part Plinko, and 100% fun. Enjoy the excitement of several bonuses, level-up features, superb graphics and animations, and an impressive Return to Player of 98.10%. Be advised there are lower-paying versions, too, so don’t forget to check the RTP in the game rules before playing with real money.
7. Pearl o’ Plinko Fire & Bones (Quickspin): 98.10%
Quickspin saw the popularity of the first Plinko slot, so they quickly followed up with Pearl o’ Plinko Fire & Bones in April 2025.
This game can also be found as a 98.10% RTP version, but unfortunately, it’s unlikely that you will come across that option, as most online casinos will opt for a lower-paying version.
8. Hero Clash (Stakelogic): 98.10%
While the best RTP version of Hero Clash averages an impressive payout of 98.10%, be aware that there are five other RTP versions out there as well. These RTP versions average 96.10%, 94.16%, 92.06%, 90.11%, and 88.08%.
9. Blood Suckers (NetEnt): 97.99%
Blood Suckers is just about a perfect option for wagering a casino bonus: an extremely high RTP and low variance. As a result, many casinos banned Blood Suckers from being played with bonus money because it’s almost certain that you’ll reach your bonus play-through requirements on it with a profit.
10. POP Royale (AvatarUXl): 97.96%
POP Royale from AvatarUX may not be the best POPwins slot in terms of gameplay, theme and features, but it has a fantastic payback percentage of 97.96%.
Check it out if you want high-volatility POPwins action with a more-than-great theoretical RTP.
The Best Payout Online Slots By Provider
As you probably know, hundreds of slot providers have created thousands of online slots. We have selected the best and most popular providers and listed the top 10 highest-paying slots per provider.
Top 10 best payout NetEnt slots
NetEnt has released several high-payout slots, especially when you dig into its older catalogue. Their best-paying slot is Mega Joker, a classic Joker-style slot with a base and top game. Second on the list is Blood Suckers, a game with such a high RTP that it is banned from playing with bonus money.
Other crowd favourites include the fantastic Guns N’ Roses, Hotline, and Secrets of Atlantis.
- Mega Joker – 99.00% RTP
- Blood Suckers – 97.99% RTP
- Secrets of Atlantis – 97.07%
- Jack Hammer 2 – 97.07% RTP
- Hotline – 97.04% RTP
- Steam Tower – 97.04% RTP
- Motörhead – 96.98% RTP
- Guns N’ Roses – 96.98% RTP
- Coins Of Egypt – 96.97% RTP
- King of Slots – 96.96% RTP
Top 10 best payout Play’n GO Slots
In recent years, Swedish game developer Play’n GO has become a leading supplier of online casino games due to popular slot titles like Book of Dead, Reactoonz, Rise of Olympus, Gemix, and many more.
While most of their payout percentages hover around the 96.20% mark, several high-paying Play’n GO slots can be found.
- Rage to Riches – 97.12% RTP
- Mystery Egg Surprise – 96.98% RTP
- Mystery Joker 6000 – 96.98% RTP
- Xmas Joker – 96.98% RTP
- Wildhound Derby – 96.93% RTP
- Fortunes of Ali Baba – 96.89% RTP
- Pearl Lagoon – 96.88% RTP
- Myth – 96.88% RTP
- Cash Pump – 96.86% RTP
- Pearls of India – 96.84% RTP
Top 10 best payout Big Time Gaming slots
Big Time Gaming is one of the industry’s most popular and respected online casino slot game suppliers.
The company was launched in 2011 in Australia by three experienced casino professionals, including CEO Nik Robinson.
They are widely well-known for their popular games and for being the inventor of the Megaways slots mechanic. Players also know and respect them for the high payout percentages of their slots.
- White Rabbit Megaways – 97.24% RTP
- Queen of Riches Megaways – 96.90%
- Castle Of Terror – 96.72% RTP
- King of Cats Megaways – 96.72% RTP
- Rasputin Megaways – 96.68% RTP
- Opal Fruits – 96.75% RTP
- Danger High Voltage 2 – 96.66% RTP
- Max Megaways 2 – 96.65% RTP
- Kingmaker Megaways – 96.65% RTP
- The Final Countdown – 96.65% RTP
Top 10 best payout Quickspin slots
Quickspin was founded in 2011 by three experienced online professionals from Sweden who had previously held top positions at NetEnt and Unibet. In 2016, the company was acquired by iGaming giant Playtech.
One of the most popular slot suppliers for years, Quickspin has released many successful slots, such as Sevens High, Sakura Fortune, Phoenix Sun, Big Bad Wolf, Cash Truck, and the Sticky Bandits franchise.
Quickspin is known for its highly polished, entertaining slots and high payout percentages.
- Pearl O Plinko Mermaid Cove – 98.10% RTP
- Pearl o’ Plinko Fire & Bones – 98.10% RTP
- Big Bad Wolf Christmas Special – 97.34% RTP
- Big Bad Wolf – 97.34% RTP
- Treasure Island – 97.07% RTP
- Mighty Arthur – 96.94% RTP
- Gold Lab – 96.90% RTP
- Genies Touch – 96.90% RTP
- Polar Paws – 96.84% RTP
- Goldilocks – 96.84% RTP
Top 10 best payout Pragmatic Play slots
Pragmatic Play is a thriving casino game developer that was founded in 2015.
In recent years, their casino games have become among the most popular online titles, including Sweet Bonanza, Sugar Rush, Wolf Gold, Big Bass Bonanza, Mustang Gold, and The Dog House.
- Wild Wild Riches – 96.77% RTP
- Big Bass Splash – 96.71% RTP
- Christmas Big Bass Bonanza – 96.71% RTP
- Bigger Bass Bonanza – 96.71% RTP
- Lucky Grace & Charm – 96.71% RTP
- Floating Dragon – 96.71% RTP
- Hot to Burn – 96.71% RTP
- Emerald King Rainbow Road – 96.71% RTP
- Big Bass Bonanza – 96.71% RTP
- Return of the Dead – 96.71% RTP
Top 10 best payout Push Gaming slots
Push Gaming was founded in London in 2010. The success of the British casino game supplier wasn’t instant, but the game provider has started releasing one slot hit after another in recent years.
One common trait among Push Gaming slots, in addition to offering excellent RTPs, is that they are highly volatile and often offer enormous maximum win potential.
- Wild Swarm – 97.03% RTP
- The Shadow Order – 96.98% RTP
- Wild Wheel – 96.98% RTP
- Jammin’ Jars – 96.83% RTP
- Razor Shark – 96.70% RTP
- Joker Troupe – 96.68% RTP
- Viking Clash – 96.67% RTP
- Fat Drac – 96.57% RTP
- Razor Returns – 96.55% RTP
- Big Bamboo – 96.52% RTP
How is the RTP of a casino game determined?
The theoretical RTP of a casino slot is determined by playing hundreds of millions of spins and then dividing the total payouts by the total stake, expressed as a percentage of 100%.
Be aware that many online casino games (primarily slots) may have different payback settings across various casinos. So, in one casino, an online slot may have an RTP of 96%, while in another casino, the same slot may pay back only 94% of all money that has been put in.
Always check the game rules to ensure you are playing in the highest payout setting.
If you are unsure what the highest RTP is for a particular game or want to find out which online casino offers the best-paying version of your favourite slot, use the search bar above. We will answer both questions within seconds.
Frequently Asked Questions About High-Payout Slots
It does not. Every casino game, including high-RTP slots, has a house edge. However, you will benefit from more spins before you run out of funds and, therefore, better odds of landing a big win.
You cannot influence or alter the RTP of an online slot. So, betting patterns, number of pay lines, bet size, and time-on-machine will not change the payout percentage in any way, shape, or form.
That’s a good question, and if you have ever found one, please tell us about it. No, jackpot slots tend to have very low payback percentages. A big chunk of each bet goes toward feeding the progressive jackpots, leaving little behind for wins during the game’s regular slot play.
Generally, most popular table games and live casino games have a lower house edge and, thus, a higher payout percentage than most slots.
Most online casinos offer slots in lower RTP settings to increase the house edge, driving bigger profits.
Slots with a payback percentage of 97%, 98%, or 99% are considered high payout slots. They are rare, but they do exist!
The Return To Player (RTP) percentage shows how much the slot pays back to the player. It is calculated over billions of spins and is always an average. The RTP defines the online casinos’ long-term win margin on a specific slot. The RTP percentage of each slot can be found in the slots info section or the game rules.
As a general rule of thumb, if you want to be sure you are playing a high-RTP slot, play an older slot, as these often don’t come in different payout settings. Old slots from Big Time Gaming, Thunderkick, Quickspin and Relax Gaming have good to great RTPs.
Most new Elk Studios, new Thunderkick, Red Tiger Gaming, Playtech, Eyecon and Inspired slots have a poor RTP. Slots from other providers may have a reasonable default RTP, but can still be offered in a low-paying version.
