400% deposit bonuses are among the most generous promotions you’ll find at online casinos in Ireland. In this guide, we’ll explain how these bonuses work, where to find them, and how to pick the best ones. We’ve also put together a list of top-rated 400% welcome bonuses for you.
400% Casino Bonus in Ireland 2025
18+ | T&Cs apply.
- + Take Olympus (Betsoft)
- + 100% up to €700
- + 50 Spins on Fruit Zen
18+ | T&Cs apply.
- + Take Olympus (Betsoft)
- + 100% up to €500
- + 50 Bonus Spins
18+ | T&Cs apply.
- + Take Olympus (Betsoft)
- + 100% up to $500
- + 50 Spins on Fruit Zen
18+ | T&Cs apply.
- + 100 Bonus Spins
- + The Wish Master (NetEnt)
- + Bonus Code: GENIE1
18+ | T&Cs apply.
- + Lucky Dwarfs (Ela Games)
- + 100% up to €1,000
- + 100 Bonus Spins
18+ | T&Cs apply.
- + Take Olympus (Betsoft)
- + 200% up to €1000
- + 100 Bonus Spins on Sugar Pop
18+ | T&Cs apply.
- + Sweet Bonanza (Pragmatic Play)
- + Bonus code: SWEETRED100
- + €150 & 150 Bonus Spins
18+ | T&Cs apply.
- + Total Overdrive (Betsoft)
- + Bonus code: ZAM20
- + Wager-free
18+ | T&Cs apply.
- + Primal Hunt (Betsoft)
- + Bonus Code: MDN20
- + 150% up to €300
18+ | T&Cs apply.
- + Deep Sea (BGaming)
- + Bonus Code: DEEPBIT
- + 100% up to €400
18+ | T&Cs apply.
- + Tower of Fortuna (Betsoft)
- + Bonus code: ZAM20
- + Wager-free
18+ | T&Cs apply.
- + Primal Hunt (Betsoft)
- + Bonus Code: MDN20
- + 150% up to €300
18+ | T&Cs apply.
- + Wager Free!
- + Bonus Code: DML150
- + Automatic accrediting
18+ | T&Cs apply.
- + Izzi Art (BGaming)
- + Code: EXCLUSIVE
- + 50% up to €300
18+ | T&Cs apply.
- + Big Bass Splash
- + 100% up to €500
- + 150 Bonus Spins
18+ | T&Cs apply.
- + Wild Chicago
- + 100% up to €1000
- + 100 Spins on Elvis Frog in Vegas
18+ | T&Cs apply.
- + Book of Sirens
- + Wagering x3
- + 120% up to €300
18+ | T&Cs apply.
- + Book of Cats (Bgaming)
- + 100% up to €500
- + 200 Bonus Spins
18+ | T&Cs apply.
- + Book of Fallen
- + 120% up to €300
- + 120 Extra Spins
18+ | T&Cs apply.
- + €5 No Deposit Bonus
- + Exclusive Casino Bonuses
- + Brand-New Online Casinos
18+ | T&Cs apply.
- + Book of Dead
- + 120% up to €300
- + 70 Bonus Spins
18+ | T&Cs apply.
- + Book of Dead
- + 100% up to €200
- + On first deposit
18+ | T&Cs apply.
- + Code: BLITZ3
- + 100% up to €150
- + 150 Bonus Spins
18+ | T&Cs apply.
- + Book of Fallen
- + Code: tbx0
- + 100% up to €500
18+ | T&Cs apply.
- + Aviator (Spribe)
- + 100% up to €100
- + 100 Bonus Spins
18+ | T&Cs apply.
- + Bonus Code: Top15FS
- + 100% up to €1000
- + 100 Bonus Spins
18+ | T&Cs apply.
- + Book of Dead
- + 100% up to €100
- + 100 Bonus Spins
18+ | T&Cs apply.
- + 10% Daily Cashback
- + Live Casino
- + €20 Minimum Deposit
18+ | T&Cs apply.
- + Dragon’s Lucky 25
- + 100% up to €200
- + 70 Extra Spins
18+ | T&Cs apply.
- + Dragon’s nest (Mascot)
- + 100% up to €300
- + 100 Bonus Spins
18+ | T&Cs apply.
- + Fire In The Hole xBomb
- + Code: EXCL15
- + Choose your Welcome Bonus
18+ | T&Cs apply.
- + On 3 BGaming Slots
- + 100% up to €100
- + 180 Bonus Spins
18+ | T&Cs apply.
- + Odin's Tree (Gamebeat)
- + 100% up to €500
- + 100 Bonus Spins
18+ | T&Cs apply.
- + Pandastic Adventure
- + Code: PANDA30
- + 100% up to €400
18+ | T&Cs apply.
- + Book of Dead
- + 100% up to €200
- + €12 Minimum Deposit
18+ | T&Cs apply.
- + 3X3: Hold The Spin (Gamzix)
- + Code: DREAMBONUSMAX
- + €1000 Bonus + 100 Spins
18+ | T&Cs apply.
- + Wilds of Fortune
- + Code: FORTUNE50
- + Up to 100% bonus & 300 Spins
18+ | T&Cs apply.
- + 100% up to €1000
- + 1st deposit Code: GRATO100
- + Min. Deposit €10
18+ | T&Cs apply.
- + 100% up to €200
- + 10 extra raffle tickets
- + Code: GOLDNUGGET
18+ | T&Cs apply.
- + Aloha King Elvis
- + 100% up to €500
- + 100 Bonus Spins
18+ | T&Cs apply.
- + Sugar Rush
- + Code: ZAMSINO
- + 125% up to €300
18+ | T&Cs apply.
- + Piggy Bank Bills (Pragmatic)
- + 100% up to €300
- + 100 Spins on Bonanza Billion
18+ | T&Cs apply.
- + Skulls UP (Quickspin)
- + 150% up to €150
- + 50 Spins on Sakura Fortune
18+ | T&Cs apply.
- + Royal Joker Hold and Win
- + Code: 50BLITZ1
- + 100% up to €2.500
18+ | T&Cs apply.
- + Sweet Bonanza
- + 100% up to €750
- + 100 Bonus Spins
18+ | T&Cs apply.
- + €500 Non-Sticky Bonus
- + 100 Bonus Spins
- + Vegas Star / Blazing Cash 2
18+ | T&Cs apply.
- + 3X3: 27 Ways(Gamzix)
- + Code: EASYWINDREAM
- + 100% Bonus + 100 Spins
18+ | T&Cs apply.
- + Zeus The Thunderer
- + Code: SLOTS20
- + €500 Bonus & 100 Spins
18+ | T&Cs apply.
- + Northern Sky (Quickspin)
- + 100% up to €200
- + 50 Spins on Book of Dead
18+ | T&Cs apply.
- + Luck & Magic (Bgaming)
- + Code: LUCK10
- + €500 Bonus & 100 Spins
18+ | T&Cs apply.
- + Starburst
- + Code: FREESPINS50
- + 100% up to €150
18+ | T&Cs apply.
- + Bastet and Cats
- + Code: ZAMSINO
- + 125% up to €300
18+ | T&Cs apply.
- + Big Bass Keeping it Reel
- + 100% up to €111
- + 33 Extra Spins
18+ | T&Cs apply.
- + Big Bass Bonanza
- + Code: BONANZA
- + 200% Casino Bonus
18+ | T&Cs apply.
- + Play'n Go games
- + 100% up to €300
- + 50 Bonus Spins
Choosing the Best 400% Casino Bonuses at Online Casinos
A 400% deposit bonus can significantly boost your bankroll, but selecting the right offer requires reviewing key factors such as wagering requirements, eligible games, and withdrawal limits. Not all high-percentage bonuses provide the same value, so it’s essential to analyze the terms before committing.
To simplify the process, we have compiled a list of the best 400% deposit bonuses available at licensed Irish casinos. Platforms like PrimeBetz Casino and Windetta Casino feature generous deposit matches with competitive terms, making them strong choices for players looking to maximize their funds.
While these casinos are reputable and secure, always check the terms of any promotion to ensure it aligns with your playing preferences. A well-chosen 400% bonus can provide extended gameplay and greater winning potential.
💡 Tip: 400% bonuses often come with tiered wagering structures, where bonus funds and winnings have separate wagering tracks. Advanced players use this by targeting fast-clearing slots with high hit frequency early on to clear the bonus portion, then switching to high-volatility games for the winnings. This phased strategy maximises both survival and upside within the same bonus window.
Types of 400% bonuses
A 400% bonus is a promotional offer for players who make a deposit, typically aimed at first-time users.
Because it’s such a generous offer, a 400% bonus is usually part of a welcome package and applies to one or more deposits after signing up.
For example, for an initial deposit of 100 euros, the casino may give you an extra 400 euros to play with (400% of the amount deposited). This gives you a total of 500 euros in your account, with which you can bet on the games that are allowed by the promotion.
It’s important to note that this bonus is typically for playing only, not for direct withdrawal. If withdrawal of the bonus is allowed, the wagering requirements are likely to be significantly stricter.
Bonuses of this type may also be offered on reload, but the percentages are generally not as generous. A deposit bonus can also include free spins on slots, cashback, loyalty points, and tickets to big prize tournaments. Casinos also have certain protections and limitations to manage these bonuses, and they are always tied to a specific minimum and maximum amount.
Understanding Bonus Terms and Conditions Before You Claim
Before claiming a casino bonus, carefully reviewing the terms and conditions is essential. Every bonus comes with rules that determine how you can use the funds and withdraw any winnings.
Key factors to consider include wagering requirements, eligible games, bet limits, and withdrawal restrictions. For example, at NovaJackpot Casino, some bonuses may only apply to specific slots, while Casinoin Casino might limit maximum bet sizes when playing with bonus money.
Learning to evaluate these conditions helps you make informed decisions and avoid surprises later. Only claim a bonus if you fully understand its requirements and how they affect your gameplay.
Betting requirements
For starters, it should be noted that any casino promotional offer, whether we’re talking about no deposit bonuses or those that require an initial investment (even a minimum deposit), will come with certain wagering requirements.
The wagering requirements are generally expressed as a multiple of the amount received as a bonus (it can also be a combination of the amount deposited and the bonus or the amount won).
For example, on a bonus of 200 Euro, you may be asked to roll that amount 40 times. This means that you will have to place bets of 8000 Euro at certain rather low values (requiring many rounds of play) before you can withdraw whatever winnings that remain.
💡 Tip: For high wagering like 40x on €200 bonuses, pros avoid volatile swings by using step wagering, starting with high-frequency slots like Reactoonz or Twin Spin to build a buffer, then switching to medium-volatility slots with free spin features that can spike your balance without breaching max bet rules. It’s a grind, but it’s how grinders survive deep rollovers without busting early.
Gambling restrictions
Casinos also place restrictions on where you can use the bonus and which games count toward meeting wagering requirements. Slots are almost always allowed (but some may be prohibited by the terms of the offer), and some casinos may also allow the use of table games, live casino tables, etc.
In general, the use of games outside the Slots category will contribute a much smaller percentage to the wagering requirements (a percentage of 10 or 20% of the amount used is considered, so it takes several rounds to cover the requirements).
Time limits
Remember to use the bonus within the time available for this purpose. If you only have a week to meet the 40x wagering requirement, be sure to do so. Otherwise, you risk losing both the bonus and the amount earned with it.
How to find 400% bonuses at online casinos in Ireland
A 400% deposit bonus is a rare and generous offer, so it’s not easy to find at online casinos. It’s a good idea to check new casinos first, which tend to have bigger budgets to attract players quickly.
To find online casinos in Ireland, you can check the GRAI’s list of newly licensed sites or subscribe to news sites about the gambling industry. But there’s an easier way.
We especially recommend using our recommended 400% bonuses list. The casinos on our list are reliable, offer generous bonuses, and have reasonable standard terms and conditions.
How to optimize the benefits of a bonus
Since you invest time and money, it’s wise to maximize the benefits. To achieve this, I recommend a few things in particular:
- Read the offer’s terms and conditions carefully and comply with them. This will help you understand the limits and what you can gain from a bonus.
- Test the free slot variants before putting money into them. Covering your wagering requirements is easier if you use slots you are more comfortable with.
- Choose good bonuses that are not too restrictive.
💡 Tip: To fully optimise a bonus, experienced players track wagering-to-balance ratio in real time, a simple calculation of remaining wagering divided by current balance. If the ratio exceeds 10:1, they adjust strategy mid-play by shifting to high-RTP, low-variance slots to preserve funds. If it drops below 4:1, they ramp up volatility to chase a cashout. This dynamic shift is key to beating tough bonus structures efficiently.
Licenses and regulations
It is important to always choose bonuses from online casinos that are licensed in Ireland. This gives you a certain degree of protection, as these casinos are obliged to comply with the regulations. The license is obtained from the GRAI, and you can check the authority’s website to see if a casino holds it.
The regulations may require the casino not to exaggerate wagering requirements, to have enough money to be able to pay withdrawal requests and to find other ways to protect the player from any foul play.
400% bonuses explained for beginners
A 400% deposit bonus can be easily explained by an example like the one below.
Let’s say you are faced with a 400% deposit bonus offer at a new online casino, and you are required to make a minimum deposit of 50 euros in order to access it. In this case, the 400% bonus is related to the amount you want to deposit, so we are talking about 200 Euro (400% of 50 Euro).
The casino will give you an extra 200 Euro to bet with, plus the 50 Euro you deposit. You have a total of 250 euros to bet on the slots allowed by the terms of the offer. Once you meet the wagering requirements, you can withdraw any leftover winnings.
Getting a 400% bonus, step by step
- The first step is to choose a quality casino that offers this type of casino bonus. We recommend our list of the best 400% bonuses in Ireland. They are carefully selected and provide an excellent starting point.
- Then, you will need to register at that casino, provide the required personal data, and verify your identity.
- Make a first deposit at that casino with an amount large enough to activate the bonus. The chosen payment method must also be one of the allowed ones.
- Once the bonus is credited, you can use it to bet on slots or other eligible games.
- After fulfilling the wagering requirements, you will also be able to withdraw your winnings.
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Best 400% Casino Welcome Bonuses in Ireland 2025
| Cashwin Casino | 🎁 400% Welcome Bonus up to €2,000 – Code: CASH400 |
| Wild Fortune Casino | 🔥 400% First Deposit Match up to €1,500 |
| Mr Fortune Casino | 💎 400% Casino Boost up to €3,000 – Code: FORTUNE400 |
| Clubhouse Casino | 💰 400% Matched Bonus up to €2,500 + 100 Free Spins |
| Level Up Casino | 🎟️ 400% High Roller Bonus up to €5,000 |
| Conquestador Casino | 🚀 400% Deposit Offer up to €1,200 – Code: CQ400 |
| Verde Casino | 🎲 400% Crypto Bonus up to 2 BTC or €2,000 |
| Wasino Casino | 💸 400% Casino Welcome Package up to €2,000 + 50 FS |
| Lucky Days Casino | 🏆 400% Exclusive Bonus up to €1,800 – Code: LUCKY400 |
| Arena Casino | 🎮 400% Reload Bonus up to €1,500 every weekend |
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