20+
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Matti Slotte Written by M.Slotte
Jean-Pierre Lemoine Reviewed by J.-P. Lemoine

The Best 400% Deposit Bonus in the UK

A 400% deposit bonus is a HUGE promotion offered at certain online casinos that gives you four times your deposit in extra bonus funds! If, for example, you deposited £100, your account would be credited with a whopping £500 in total funds for you to play with! Naturally, 400% deposit bonuses aren’t the easiest to come by—but in this guide, I’m going to show you where to find them, and why you can trust KasinoBonus’ recommendations!

Casinos Offering 400% Bonuses

While 400% deposit bonuses in the UK aren’t always the easiest to find, there are some reputable casinos currently offering them. If you’re looking to claim a 400% bonus and want to know the safest casinos to claim them at, check out our personalised picks below:

CasinoJoy

4.8/5
Aggregated Rating: 49.8
Trustpilot rating: 1.9
CasinoGuru rating: 1.8
AskGamblers rating: 4.7
CasinoOrg rating: 4.8
Established date: 2025
Payout rate: 95.55%
Withdrawal time: 0-3 Days
CasinoJoy review
  • Play on Android, iOS, and desktop
  • Live chat support is available 24/7
  • VPN allowed
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Jackpot Raider

4.8/5
Aggregated Rating: 69.5
Trustpilot rating: 3.4
Established date: 2022
Payout rate: 96%
Withdrawal time: 0-3 Days
  • Deposit Bonus 225% UP to 450£ + 250 FS ON YOUR FIRST 3 DEPOSITS
250 free spins on your first 3 deposits
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Wheelz

Wheelz

4.5/5
Aggregated Rating: 76.8
CasinoGuru rating: 9.7
Established date: 2020
Payout rate: 96.5%
Withdrawal time: 0-3 Days
  • FREE 20 freespins no deposit
  • Deposit Bonus 100% 300€
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BetsBunny

4.6/5
Aggregated Rating: 51.5
Trustpilot rating: 2.6
CasinoGuru rating: 2.1
AskGamblers rating: 6.3
Established date: 2023
Payout rate: 96.20
Withdrawal time: 0-3 Days
BetsBunny review
  • 50 no deposit free spins with promo code 50FS
  • Solid lineup of providers — Pragmatic, Nolimit City, Relax
  • Quick withdrawals and decent support
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WillBet

4.8/5
Aggregated Rating: 77.0
Trustpilot rating: 4.5
CasinoGuru rating: 7.2
AskGamblers rating: 7.6
Established date: 2024
Payout rate: 97%
Withdrawal time: 0-3 Days
WillBet review
  • Built‑in crypto wallets with support for over 20 coins
  • 4,000+ games
  • Tiered VIP ladder offering
No deposit bonus: 5 FREE SPINS for BGaming slots
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Stupid Casino

4.6/5
Aggregated Rating: 61.0
Trustpilot rating: 2.5
CasinoGuru rating: 5.4
AskGamblers rating: 7
Established date: 2023
Payout rate: 96.5%
Withdrawal time: 0-3 Days
Stupid Casino review
  • Home to more than 80 gaming providers
  • 24/7 live chat
  • Excellent selection of payment methods
20 FREE SPINS on Tower of Fortuna
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SpinBetter

4.8/5
Aggregated Rating: 80.0
Trustpilot rating: 3.8
CasinoGuru rating: 8.4
AskGamblers rating: 9
Established date: 2019
Payout rate: 96,07%
Withdrawal time: 0-3 Days
  • Regular players can benefit from their loyalty program
  • No deposit bonuses can be activated
  • Their online slots include titles with progressive jackpots
  • For bettors, they provide a sports betting section
150 Free Spins Without Deposit With Our Promo Code (x25 Wager)
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Rollino

4.5/5
Aggregated Rating: 70.0
Established date: 2023
  • Total value of free spins: €2 (20 spins at €0.1 per spin)
  • Wagering criteria: 40X
  • Maximum bet: €0.5 (wagering)
20 FREE SPINS on Take Olympus (Betsoft). Verify his email to activated the NDB.
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SlotsStars

4.6/5
Aggregated Rating: 64.3
Trustpilot rating: 2.5
CasinoGuru rating: 7.8
AskGamblers rating: 5.9
Established date: 2018
Payout rate: 92.33–97.15%
Withdrawal time: 0–3 days
  • Operate under UKGC and MGA
  • Live chat available
  • Mobile friendly design
  • Top tier software providers
125 no deposit free spins with registration
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Use Code: 50FS

Froggybet

4.5/5
Aggregated Rating: 66.5
Trustpilot rating: 2.5
AskGamblers rating: 7.6
Established date: 2025
Payout rate: 97.5%
Withdrawal time: 0-3 Days
Froggybet review
  • Supports 9 languages
  • Many responsible gambling tools
  • Extensive game collection
  • 24/7 live support
50 FS No Deposit + 50 FS on Gonzo’s Quest with 1st Deposit
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NationalBet

4.5/5
Aggregated Rating: 58.8
Trustpilot rating: 2.1
CasinoGuru rating: 5.3
Established date: 2020
Payout rate: 96.5%
Withdrawal time: 1-4 Days
  • No wagering: 50 free spins without wagering for Gates of Olympus when you make a deposit.
  • Deposit bonus: 250 free spins for 3 first deposits
250 free spins for 3 first deposits + 50 free spins after a deposit
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Spinz

4.6/5
Aggregated Rating: 73.8
Trustpilot rating: 2.7
CasinoGuru rating: 9.7
AskGamblers rating: 7.4
Established date: 2018
Payout rate: 96.5%
Withdrawal time: 0-4 Days
  • FREE 100 freespins (deposit needed)
  • Deposit Bonus 100% 300€
100% Bonus to 300€ + 100 Freespins
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BassWin

4.0/5
Aggregated Rating: 57.0
Trustpilot rating: 3.1
CasinoGuru rating: 5.1
AskGamblers rating: 4.5
Established date: 2024
Payout rate: 92-98%
Withdrawal time: 0-7 Days
  • Extensive game selection from over 150 software providers
  • Mobile-optimised website
  • Offers both traditional sports betting and eSports
No Deposit Bonus: 50 FS in Lucky Dama Muerta
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Bonus code: W20TOF

Wolfy

4.6/5
Aggregated Rating: 55.3
Trustpilot rating: 2.2
CasinoGuru rating: 3
AskGamblers rating: 7.7
Established date: 2020
Payout rate: 95.3%
Withdrawal time: 0-2 Days
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  • Multiple payment options
  • Home to leading software providers
  • Live chat is available
20 FREE SPINS no deposit for Tower of Fortuna
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Cipher Wins

4.0/5
Aggregated Rating: 66.5
Trustpilot rating: 2.9
AskGamblers rating: 6.8
Established date: 2025
Payout rate: 96%
Withdrawal time: 0-3 Days
  • Home to more than 5,000 games
  • 24/7 live chat
  • Multi-lingual support available
50 FS no deposit on Wilds of Fortune
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FatPirate

4.5/5
Aggregated Rating: 61.0
Trustpilot rating: 2.4
CasinoGuru rating: 7.1
AskGamblers rating: 5.5
Established date: 2024
Payout rate: 97%
Withdrawal time: 0-3 Days
  • Welcome bonus 100% up to €500 + 200 FS
Welcome bonus 100% up to €500 + 200 FS
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Casinolab

4.5/5
Aggregated Rating: 42.8
Trustpilot rating: 1.7
CasinoGuru rating: 2.5
AskGamblers rating: 4.2
Established date: 2021
Payout rate: 96%
Withdrawal time: 0-3 Days
  • Welcome bonus 100% up to €500 + 200 FS + 1 Bonus Crab
  • Weekly Reload 50 Free Spins
  • Weekend Reload Bonus €700 + 50 Free Spins
Welcome bonus 100% up to €500 + 200 FS + 1 Bonus Crab
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BetFury

4.9/5
Aggregated Rating: 80.0
Trustpilot rating: 3.8
CasinoGuru rating: 9.8
AskGamblers rating: 7.6
Established date: 2019
Payout rate: 97%
Withdrawal time: 0-3 Days
  • FREE 100 freespins no deposit needed (Betfury Bonanza, Joker Stoker, Bastet, Cats)
  • Deposit Bonus 200% to 500$ USE CODE: KASINOBONUS
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Slotland

4.8/5
Aggregated Rating: 77.5
Trustpilot rating: 4.3
CasinoGuru rating: 8.8
AskGamblers rating: 6.4
CasinoOrg rating: 3.6
Established date: 1998
Payout rate: 95%
Withdrawal time: 0-3 Days
  • FREE 32$, no deposit bonus, use code FREE32KASI
  • Deposit Bonus 250% match bonus
32$ NO DEPOSIT BONUS - Use Code FREE32KASI
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BC Game

4.7/5
Aggregated Rating: 51.3
Trustpilot rating: 1.3
CasinoGuru rating: 7.2
AskGamblers rating: 1.9
CasinoOrg rating: 4.4
Established date: 2019
Payout rate: 97%
Withdrawal time: 0-3 Days
  • Crypro payments
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Up to 470% deposit bonus + 400 free spins
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Caxino

4.7/5
Aggregated Rating: 70.0
Trustpilot rating: 1.8
CasinoGuru rating: 9.7
AskGamblers rating: 7.7
Established date: 2018
Payout rate: 96.5%
Withdrawal time: 0-3 Days
  • FREE 100 free spins (deposit needed)
  • Deposit Bonus 100% 200€
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Chipz

4.7/5
Aggregated Rating: 81.3
Trustpilot rating: 4.3
CasinoGuru rating: 9.7
AskGamblers rating: 7.2
Established date: 2021
Payout rate: 96%
Withdrawal time: 0-3 Days
  • FREE Deposit 10€ -> Get 100 Freespins - NO WAGER!
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Jackbit

5.0/5
Aggregated Rating: 82.0
Trustpilot rating: 4.4
CasinoGuru rating: 8
AskGamblers rating: 9
Established date: 2022
Payout rate: 97%
Withdrawal time: 0-3 Days
  • Deposit Bonus 100 wager free spins (50$ deposit needed)
  • 10% Cashback Sportsbetting
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Win A Day Casino

4.6/5
Aggregated Rating: 75.5
Trustpilot rating: 4
CasinoGuru rating: 9
AskGamblers rating: 6.2
Established date: 2015
Payout rate: 95.5%
Withdrawal time: 0-3 Days
  • FREE 30$ (25$ deposit needed)
  • Deposit Bonus 250% match bonus
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BetMaximus

4.6/5
Aggregated Rating: 50.0
Trustpilot rating: 2.1
CasinoGuru rating: 7.8
AskGamblers rating: 1
Established date: 2023
Payout rate: 96.5%
Withdrawal time: 0-3 Days
  • FREE 25 Freespins to Book of Dead - NO DEPOSIT. IMPORTANT - USE Promo Code: BOOK25 after registration to get the spins!
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Once you’ve found your ideal casino, simply sign-up and make a qualifying deposit, and you’ll unlock your 400% bonus right away!

How We Review Casinos

Here at KasinoBonus, we know how important it is that you can find—and play at—safe online casinos. That’s why we have a dedicated team working around the clock, testing, reviewing, and evaluating casinos!

Our team personally joins and plays at each casino we review, allowing us to give you our honest, first-hand experiences. We look for a number of different metrics, including:

Types of 400% Deposit Bonuses

While 400% deposit bonuses aren’t the most common in the world, they can be found – if you know where to look. Here’s an overview of some of the main types of these bonuses you’ll find while playing at the top NZ online casinos:

  1. Welcome Bonuses: Welcome bonuses are the most common type of 400% deposit bonus – and these promotions are offered to new players, as a way of incentivising them to join. Welcome bonuses can include just the deposit bonus – or, they can also be bundled with other promos like free spins and cashback.
  2. Reload Bonuses: Sometimes, online casinos offer one-off promotions – called reloads – to players. These are generally reserved for regular players and VIPs, and while most reload bonuses tend to be worth less than 100%, some casinos may offer 400% reloads.
  3. High Roller Bonuses: In an attempt to attract new high roller players, some online casinos offer very generous high-roller-only promotions – often in the form of a 400% match. These are available to players making larger-than-normal deposits, with the minimum deposit requirement often as high as £500!

BC.Game: A Top KasinoBonus Casino

One of our favourite brands we’ve reviewed recently is BC.Game – one of the world’s leading crypto-focused online casinos. The site offers a huge range of innovative features, a user-friendly design, and pretty much every cryptocurrency you could ever want!

They offer a huge selection of games, spanning video slots, crash games, table games, live dealer studio, and even provably fair games – and this means you can personally verify the results of game rounds for yourself!

What I really like about BC.Game is the bonus structure, too. All new players can claim a whopping 470% matched deposit bonus and 400 free spins – and that’s not all: their loyalty program is one of the best out there, rewarding you whether you win or lose!

400% Deposit Bonuses: Terms and Conditions

A 400% deposit bonus offers massive bonus funds relative to your deposit, but due to the high value of the bonus – it does come with some pretty strict terms and conditions. Here’s what to look for before claiming these bonuses for yourself:

How to Claim a 400% Deposit Bonus

  1. Sign up at a casino offering a 400% bonus, or log in to your existing account if the offer is available to current players.
  2. Go to the promotions page to find the bonus details and ensure it’s still active.
  3. Check for a promo code as some 400% bonuses require one. Enter it when making your deposit if it’s required.
  4. Make a qualifying deposit – usually £10-£20 unless otherwise specified.
  5. Confirm the bonus is credited. (If it’s not, reach out to customer support before you begin playing.)
  6. Enjoy your bonus – and cross your fingers hoping for a win!

Pros & Cons

Deposit bonus
Deposit bonus

Pros

  • ✅ Higher bonus amounts compared to no-deposit offers
  • ✅ Unlocks access to welcome packages and VIP perks
  • ✅ Often includes both bonus cash and free spins
  • ✅ Great value for players who already plan to deposit
  • ✅ Widely accepted across most online casinos

Cons

  • ❌ Comes with wagering requirements (sometimes 30x–50x)
  • ❌ Bonus funds may be locked until conditions are met
  • ❌ Some games are excluded from bonus play
  • ❌ Max bet limits may apply while using bonus
  • ❌ Withdrawal is often restricted until bonus is cleared

Top 3 Deposit Bonus Offers

🎰 Casino Brand🕹️ Game🎁 Bonus🏷️ Bonus Code📋 Wagering / TermsPlay
BC GameBC GameMultiple GamesUp to 470% + 400 FSDeposit required
Crypto-friendly
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Jackpot RaiderJackpot RaiderMultiple Games225% up to £450 + 250 FSBEST ENGAGEMENT3 deposit bonuses + spins includedPlay Now
NationalBetNationalBetGates of Olympus250 FS + 50 FSExclusiveNo wagering free spins + 3 deposit bonusPlay Now

Alternatives to 400% Deposit Bonuses

BonusBonus Calculation for £10 DepositTotal Amount to Play With (£)
100% deposit bonus£10 for £10£20
300% deposit bonus£30 for £10£40
500% deposit bonus£50 for £10£60
600% deposit bonus£60 for £10£70
1,000% deposit bonus£100 for £10£110
200% deposit bonus£20 for £10£30
50% deposit bonus£15 for £10£15

Why Trust KasinoBonus?

At KasinoBonus, trust is the foundation of everything we do. Here’s why thousands of readers rely on us:

  • 50,000 readers every month
  • 150 online casinos are tested
  • 400+ hours per month spent on casino research and content creation
  • Every casino we list is personally tested by our team (screenshots of accounts, deposits, and wins).
  • Our reviews are written and reviewed by iGaming professional Matti Slotte with 18 years of experience in poker, casino operations, and European gambling regulation.
  • We talk openly about our affiliate partnerships and never accept payment for positive reviews.
  • We update our rankings and bonus details every month to show the most accurate and up-to-date information available.
  • We recommend only licensedsafe, and responsible online casinos.

Responsible Gambling Resources

Responsible gambling and gambling addiction warning

Online gambling is an entertainment with the purpose of having a good time, but is not intended for financial gain. You should not pursue winning. Gambling addiction is a behaviour that can have very serious consequences for your life. If you feel you can not stop gambling, seek help immediately - all the contacts you need can be found on our Gambling Addiction page.

Gambling Foundation offers free and confidential support to anyone suffering from problem gambling in Finland.

Matti Slotte
Author Matti Slotte

Matti Slotte is a seasoned iGaming professional from Kuopio, Finland, with 17 years of experience in online casino reviews, affiliate marketing, and regulatory trends in the European gambling space. As the founder and Editor-in-Chief of KasinoBonus.io, he combines hands-on experience with deep industry insight to provide players with trustworthy and up-to-date casino bonus information. Matti regularly tests casinos firsthand, evaluates their bonus mechanics, and follows international gambling regulations to ensure transparent and safe recommendations. Matti Slotte is an expert in online gambling, poker, online casinos.

LinkedIn Biography page: Matti Slotte

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