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:
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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:
- Game Selection
- Cashout Speeds
- Payment Method Variety
- Customer Support Facilities
- Bonuses and Promotions
- Licensing and Security
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:
- 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.
- 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.
- 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:
- Wagering Requirements: Expect very high playthrough requirements – often 50x or more the total bonus amount. Some casinos even apply wagering to the deposit + bonus, although this is no longer allowed in the UK for welcome bonuses.
- Game Contribution Limits: Most 400% bonuses are restricted to slots only. Table games, live dealer games, and even some high-RTP slots may be excluded – or, if they do contribute, offer a significantly reduced percentage towards the wagering.
- Maximum Win & Withdrawal Caps: These bonuses often come with a maximum cashout limit – sometimes 3x or 5x your deposit – and if so, anything you win over this amount will be forfeited.
- Maximum Bet Limit: Casinos typically restrict how much you can wager per spin or round while the bonus is active – and while this varies by casino, it’s usually £5.
How to Claim a 400% Deposit Bonus
- Sign up at a casino offering a 400% bonus, or log in to your existing account if the offer is available to current players.
- Go to the promotions page to find the bonus details and ensure it’s still active.
- Check for a promo code as some 400% bonuses require one. Enter it when making your deposit if it’s required.
- Make a qualifying deposit – usually £10-£20 unless otherwise specified.
- Confirm the bonus is credited. (If it’s not, reach out to customer support before you begin playing.)
- Enjoy your bonus – and cross your fingers hoping for a win!
Pros & Cons
✅ 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 / Terms | Play |
|---|---|---|---|---|---|
 BC Game | Multiple Games | Up to 470% + 400 FS | – | Deposit required Crypto-friendly | Play Now |
 Jackpot Raider | Multiple Games | 225% up to £450 + 250 FS | BEST ENGAGEMENT | 3 deposit bonuses + spins included | Play Now |
 NationalBet | Gates of Olympus | 250 FS + 50 FS | Exclusive | No wagering free spins + 3 deposit bonus | Play Now |
Alternatives to 400% Deposit Bonuses
| Bonus | Bonus Calculation for £10 Deposit | Total 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 licensed, safe, and responsible online casinos.
Responsible Gambling Resources
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