400% Casino Bonus UK
Most casinos grant bonuses. Generous gambling sites multiply a player’s deposit by up to 100%, effectively doubling it. However, a few top-rated casinos in the UK grant a whopping 400% casino bonus. That’s right, the operator multiplies a player’s deposit by four.
Better yet, we know exactly where to find them. Our experts have researched a list of legit casinos that grant these attractive offers. Discover the top 400% deposit bonus promotions and how to claim them today!
Top 400% Deposit Bonus Promotions
| 1 | 
100% up to £150 + 50 FS Min Dep:
£10
Wager:
x50
*Terms & Conditions | 18+. New UK customers only. Opt in required. Bonus can be claimed only once. Minimum required deposit = £10. Maximum bonus = £150. Bonus money wager = 40x before bonus funds or associated winnings can be withdrawn. Bonus spins wager = 50x before bonus funds or associated winnings can be withdrawn. 50 bonus spins will be credited automatically, if bonus was activated and first deposit was made within 48 hours of registration. Welcome Spins must be used within 24 hours of crediting. Maximum bet = £5 per bet/spin when wagering with bonus money. General T&C and General Promotion Terms apply. Play responsibly. Customers who are displaying indicators of harm (at our sole discretion) are not eligible for any bonuses or promotions. |
23 Extra Spins on Book of Dead on registration + up to £111 bonus + 77 Free spins Min Dep:
£10
Wager:
x60
*Terms & Conditions | #AD 18+, New customers only, min deposit £10, wagering 60x for refund bonus, max bet £5 with bonus funds. Free Spins bonus has x40 wagering. 23 free spins on registration (max withdrawal is £100). 100% refund bonus up to £111 + 77 spins on 1st deposit. No max cash out on deposit offers. Eligibility is restricted for suspected abuse. Welcome bonus excluded for players depositing with Ecopayz, Skrill or Neteller. Full T&Cs apply. Begambleaware.org, Gamble Responsibly. | |
100% Deposit Bonus up to £100 on your first deposit + 50 Bonus Spins on Big Bass Bonanza Min Dep:
£20
Wager:
x30
*Terms & Conditions | SigTerms: 18+. New customers only. 100% Deposit Bonus up to £100 on the first deposit. 30x wagering on Deposit and Bonus (game weighting applies) + 50 Bonus Spins (Big Bass Bonanza) of £0.10. Min. deposit £20. Play responsibly • BeGambleAware.orgT&Cs apply | |
 500 Free spins Bonus code : NBWELCOME500 Code copied Min Dep:
£10
Wager:
x40
*Terms & Conditions | 18+. begambleaware.org New UK certified players | £10+ deposit | no e-wallets/prepaid cards | up to 500 free spins 40 times wagering on free spins winnings | T&Cs apply | |
| 5 Mega Casino | 
100% Bonus up to £50
Min Dep:
£10
Wager:
x30
*Terms & Conditions | Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Min. deposit: £10, max. Bonus £50. WR of 30x Deposit Plus Bonus amount (Slots count 100% and any other game 10%) within 30 days. Max bet is 10% (min £0.10) of the Bonus amount or £5 (lowest amount applies).Bonus must be claimed before using deposited funds. Bonuses do not prevent withdrawing deposit balance. First Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonus Policy applies. |
| 6 Rollbit Casino | 
10 Free Spins No Deposit & 100 Cash Spins Min Dep:
£20
Wager:
x60
*Terms & Conditions | Available for new registrations only. Max 10 bonus spins credited upon SMS validation. Finn and the Swirly Spin only. 60x Wagering, 4x Conversion up to £200. 18+. Full T&Cs apply. |
10 Free Spins Upon Registration + 100 Spins After First Deposit & 100% up to £100 + 10% Cashback Min Dep:
£10
Wager:
x35
*Terms & Conditions | #AD Welcome bonus for new players only. 10 free spins on registration (max withdraw is £100). 100 free spins after first deposit. Maximum bonus is 100% up to £100. Wagering is 35x bonus. No max cash out. Cashback is cash with no restrictions. Bonus excluded for players that deposit with Skrill or Neteller. Gambling can be addictive. Play responsibly. 18+. BeGambleAware.org | |
| 8 Prime Casino | 
100% up to £50 + 23 Casino Free Bets Min Dep:
£10
Wager:
x30
*Terms & Conditions | Sig.terms: Min £10 first deposit: Max Bonus £50. WR: 30x (Deposit + Bonus) within 30 days (Slots count 100%; other games 10%). Max Bet: £5 or 10% of Bonus (min £0.10), whichever is lower. 23 Casino Free Bets worth £0.25 each, valid on a variety of PlayTech live games. Claim bonus before using deposit. Bonuses don’t prevent withdrawing deposit balance. First Deposit Bonus can be claimed once every 72 hours across all casinos. Bonus Policy applies. |
| 9 Slingo Casino |  Get 133 Free Spins Wager:
x60
*Terms & Conditions | Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Min. deposit: £10. Game: Big Bass Bonanza, Spin Value: £0.1. WR 60x free spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings amount or £5 (lowest amount applies). Spins must be used before using deposited funds. Bonuses do not prevent withdrawing deposit balance. Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonus Policy applies. |
| 10 Royal Valley Casino | 
10 Free Spins No Deposit & 100 Cash Spins (£20 Deposit & Wager) Min Dep:
£20
Wager:
x60
*Terms & Conditions | Available for new registrations only. Max 10 bonus spins credited upon SMS validation. Finn and the Swirly Spin only. 60x Wagering, 4x Conversion up to £200. 18+. Full T&Cs apply. |
How Does a 400% Bonus Work?
A 400% bonus is a casino promotion in which the site matches your deposit by 400%. In other words, the operator takes your deposit and grants you four times that amount as a gift.
For instance, if you deposit £50, the casino applies the bonus multiplier, granting you £200 in bonus funds (£50 × 400%). The total balance becomes £250 (£50 deposit + £200 bonus). Depending on the casino, you may receive bonus cash with free spins, say 400% up to £1,000 + 200 free spins.
Benefits and Drawbacks of the 400% Deposit Bonus
The 400 welcome bonus boosts bankroll by 4x, providing additional gambling funds. At the same time, the lucrative offer may encourage players to take higher risks, potentially leading to losses beyond their original deposit. Discover the pros and cons of 400% casino bonuses below.
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A 400% bonus extends a player’s gaming session
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A great incentive for newbies who want to test games or develop strategies
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It increases the possibility of higher payouts
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Requires a low minimum deposit
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High wagering requirements make it challenging to withdraw winnings
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Some games don’t contribute to the wagering
How Slotozilla Experts Rate Online Casino Bonus Offers
At Slotozilla, we adopt a unique approach to rate online casino bonus offers. We explore factors that affect the gambling experience from the player’s point of view to provide accurate and reliable ratings. In the end, we simplify our research by giving each casino a rating score. Below are some criteria we use to assess a bonus.
- Bonus amount: Casinos with high bonus amounts rank better on our list because players receive sufficient bonus cash or free spins to gamble. Besides extending gameplay, recipients try new games, develop strategies, and possibly win money.
- Fairness of T&Cs: Our experts check the terms to verify their fairness. We assess the wagering requirements, limits, and expiry period. We prefer casinos with terms that are easier to fulfill, as the probability of withdrawing real money is higher.
- Ease of claiming: Bonuses should be easy to claim. As a result, we recommend casinos with clear instructions for activating promos. The offer should involve minimal steps and cater to a wide range of players. Likewise, it should be available via mobile apps, websites, and desktops.
- Casino’s reputation: We only consider casinos with welcome bonus that hold a valid licence from a reputable gambling authority like the UKGC, MGA, or Curaçao eGaming in our rankings. Our reviewers research the website’s payout reliability, customer support, and past player reviews to know if they are trustworthy.
Popular 400% Deposit Casino Bonuses
The 400% deposit bonus comes in different forms. Casinos tailor the promotions to cater to different player preferences and their promotional strategies. As a result, the reward is for new and existing players. The most popular types of 400% bonuses are in the table below.
| Types of Bonuses | Description |
|---|---|
| First deposit bonus | This promo is exclusively for new players. Casinos grant the bonus on the gambler’s initial deposit. As a result, it has a reasonable minimum deposit requirement and may include free spins |
| Welcome packages | Some casinos spread the 400% bonus across multiple deposits. Hence, although it is for new players, it does not only apply to the first deposit. For example, 400% up to £300 on the first deposit, 400% up to £200 on the second deposit, and £400% up to £250 on the third payment |
| Free spins | Casinos sometimes bundle a 400% deposit bonus with a certain number of free spins to play slots. This reward is for slot enthusiasts looking for a large bonus. If you deposit £200, the casino may award £8,000 and 200 free spins to play a popular slot game like Gonzo’s Quest |
| Promo codes | Players who enjoy tracking exclusive deals enjoy a unique 400% bonus that requires entering a promo code during the deposit process. Unlike others, you cannot activate the bonus with your deposit alone. For instance, you may need to enter the code “BONUS400” when paying £100 to get a £400 bonus |
| High rollers | The 400% high roller bonus is for players who deposit large sums. The minimum deposit threshold is usually higher for high-stakes players. For instance, a £1,000 deposit may receive a £4,000 bonus, earning a total bankroll of £5,000 |
Step-by-Step Guide for Claiming a 400% First Deposit Bonus
Registration
Browse our casino listing and click the link to visit your preferred online gambling site. Click “Register” and provide personal information, such as name, email, and date of birth. Set up a username and password and agree to the casino’s terms.
Verification
Visit your email or SMS and click on the link from the casino to verify your account.
Deposit money
Log into your account and go to the “Deposit” section. Choose your preferred payment method and enter an amount not lower than the minimum deposit to claim the first deposit offer for new players. If the promotion requires a bonus code, enter the code in the appropriate field.
Start gambling
After a successful deposit, the casino will credit your account with the bonus automatically. Go to the lobby and start playing eligible games.
400% Bonus Terms and Conditions
Casino promotions have terms that guide usage, including the 400% bonus. Follow these rules to avoid losing your bonus + associated winnings.
Eligibility
The 400 welcome bonus is for new players, while existing gamblers benefit from reload bonuses, cashback, and VIP perks. Some online casinos restrict players from certain countries or ages, usually 18 years.
Wagering Requirements
This is the number of times you must wager the bonus or bonus + deposit before you can withdraw winnings. If the wagering requirements are 30x and you receive £10, you must wager £300 (£10×30).
Game Contribution
Games contribute differently towards meeting the wagering requirements. Slots often contribute 100%. In other words, every £1 wagered counts as £1. In contrast, table games may contribute 10% or nothing.
Minimum Deposit, Maximum Bet, and Maximum Win
The minimum deposit is how much you must pay to activate the bonus. Players who bet above the maximum bet will lose their bonus and winnings. The maximum win restricts how much you can win from playing with the bonus. If the max win cap is £200 and you win £400, you cannot withdraw more than £200.
Expiry Period
Bonuses expire after a couple of days. Depending on the casino, the timeframe could be 3, 7, or 30 days. Players who don’t meet the wagering requirements during this period lose their bonus and winnings.
Bonus Abuse
Players who abuse their bonus risk account suspension or termination. Actions that constitute abuse include attempting to claim a 400 deposit bonus more than once by creating multiple accounts, claiming multiple bonuses simultaneously, and collusion with other players to exploit bonuses.
Other Casino Bonuses to Try
Any match deposit bonuses are juicy but rare. Our team has combed the web for alternative bonus offers that promise an equally exciting gambling journey.
400% Casino Bonus – Our Final Thought
The 400% casino bonus increases bankroll by 4x. With this newfound money, you can play games, develop strategies, and possibly win money. As a result, they are a must-have. That said, always read the terms, especially the wagering requirements, before claiming a 400% bonus.
Avoid promotions that seem too good to be true, as they often are. In the end, choose an online casino whose offering suits your gaming preferences. As our research shows, consider the casino’s reputation, ease of claiming, and available offers. Claim your 400% casino bonus today and start playing real money games!
