300% Deposit Bonus Casinos

Compare online casino sites that offer 300% deposit bonuses

Looking for online casinos that match your first deposit up to 300%? You’re in the right place.


Comparasino lists all 300% deposit bonus casinos available to UK players and gives you the tools to discover the brands that meet your specific preferences.


This means you can play at the best 300% bonus casinos for you.

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Online casinos welcome new players with a wide range of bonuses – including the 300% deposit match. This means the casino will match the deposit you make by 300%, giving you even more cash to play with.


Most 300% first deposit bonuses are matched up to a specific amount, ranging from £50 up to £1,000. Regardless of the limit, a 300% bonus essentially allows you to quadruple your bankroll.


Once the bonus cash is in your account, you can play any of the games on offer from your casino of choice, be it slots, table games, live casino titles, scratch cards, crash games, bingo and more.


The extra bankroll – allowing you to play more games and for longer – is what makes 300% first deposit bonuses so popular with players in the UK.

300% matched deposit bonuses explained

The 300% deposit match is a common bonus offered by UK online casinos to encourage players to sign up and wager at their sites for the first time.

How it works is quite simple: the online casino will match the amount you deposit by 300% up to a set value. This can range from £50 all the way up to £1,000 or more.

No matter how much you deposit, with a 300% match bonus, the casino will give you the same value back in bonus cash up to the limit set – in short, 300% first deposit bonuses quadruple your bankroll.

The math behind a 300% first deposit bonus

To better understand how a 300% first deposit bonus actually works, take a quick look at the example below:

Casino A offers new players a first deposit match bonus of 300% up to £300.

This means that if you deposit £100 of your own money you can claim £300 in bonus cash from the casino. In total, this would give you £400 to play with, broken down as follows:

  • Your deposit: £100
    Matched deposit bonus: £300
    Total bankroll: £400

Make smaller deposits and still unlock the bonus

It’s important to note that you don’t have to deposit the full £100 (in the example above) to receive the 300% deposit match – your bonus will scale according to the amount you deposit.

Depending on the minimum deposit limit set by the casino and the terms and conditions (T&Cs) of the bonus offer, you could deposit as little as £10 and still receive the 300% deposit bonus match. In this case, you’d get £30 in bonus cash, giving you £40 to play with.

One common condition for deposit bonuses that you should be aware of is a cap on how much will be given to you in the bonus. If a casino has a cap on the amount given to you as a bonus, you’re free to deposit more but won’t receive more than the bonus cap.

So if Casino A has a cap of £300 in bonus cash and you deposit £150, you won’t receive a 300% on all of the money deposited. You’ll receive a maximum of £300 in bonus cash, broken down below as:

Your deposit: £150
Matched deposit bonus: £300
Total bankroll: £450

In a nutshell, you’ll receive a bonus on the first £100 of your deposit, with the remaining £50 moving straight through to your bankroll without being multiplied by the bonus.

Why claim a 300% matched deposit bonus

Quadrupling your bankroll before you start playing seems like a pretty good shout. But if you’re still not sure what value they can add to your play, here are some of the other benefits of a 300% first deposit bonus.

Use bonus cash to boost your bankroll and play for longer without having to deposit more of your own money.

Some casinos will offer a higher cap on the bonus amount, allowing you to claim a big bonus when you sign up and play for the first time.

Use the bonus cash to test out a casino. If you’re having fun on the site, you can then use your own funds to keep playing by making additional deposits.

There are plenty of UK online casinos offering 300% matched deposit bonuses. So no matter what your preference is, you’ll find a wide selection of brands and bonus combinations to choose from.

The bonus cash you receive can be used on all games in the casino lobby, unlike other bonuses like free spins where you have to play a specific slot game.

Find the best online casinos for you

Comparasino is here to match you up with UK online casinos that offer the bonuses and experiences you’re looking for.

When you sign up at Comparasino, we’ll ask you to tell us what you want from an online casino. Don’t worry, you can answer just three questions before firing up our powerful search engine or answer a few more questions to really narrow down the best online casinos for you.

Once you’ve told us what you like, our smart recommendation engine generates a list of online casino sites that match your preferences. We then drop these brands into your own individual portal.

Each time we onboard a new online casino that meets your preferences, it’s automatically added to your list for you to play when you’re ready. This means less time searching and more time playing. What’s not to like about that?

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How to claim a 300% deposit match bonus

Claiming a 300% deposit bonus is easy – just follow these steps.

  1. Browse and compare all 300% first deposit bonuses using our tools and filters.
  2. Once you’ve found the brand and bonus for you, check the bonus T&Cs.
  3. If you’re happy with the T&Cs, click “Play”.
  4. Follow the casino sign-up process and make a deposit using your preferred payment method.
  5. Once you’ve made your deposit, you’ll receive your 300% match bonus cash straight away.
  6. Use your bonus cash to play slots, table games, scratch cards, crash games, live dealer, bingo and more.

300% deposit bonuses and a few things to consider

You might be thinking – there must be a catch. And you’re right.

Online casino bonuses often come with a couple of strings attached, and this is the case with 300% deposit match offers. That’s why it’s important to take a look at the T&Cs of any online casino bonus offer you’re checking out.

Each online casino has its own specific terms and conditions for each bonus it offers to players, so you should check them out before claiming the offer.

This is because the T&Cs can change or reduce the value of the bonus when you factor in things like win limits and wagering requirements.

That’s not to say a 300% deposit match bonus doesn’t add value to your play, but being aware of the T&Cs means you know exactly what the bonus ultimately delivers and how you can use it.

300% deposit bonus T&Cs to keep an eye out for

T&Cs can be quite lengthy, so we‘ve broken down the key terms to be aware of, what they actually mean and the impact they can have on the bonus offer.

Time limit to use the bonus - Once you’ve claimed the bonus, you’ll have a set period of time to use it before it expires. This can be as few as seven days, but in most cases, it is 30 days or more.

Win limits - Most casinos impose limits on the amount you can win from a 300% deposit bonus. Even if you win more, you won’t be able to withdraw it as cash.

Wagering contributions - Some games contribute more to the wagering requirement than others. Slots tend to chip away the most so if you want to play games it will take longer to clear

Minimum deposit to trigger the bonus - Most 300% deposit bonuses will have a minimum deposit you need to make to trigger the promotion, usually between £10 and £20.

Payment method restrictions - If you deposit with digital wallets such as Skrill and Neteller, some online casinos will not allow you to claim the 300% first deposit bonus.

Wagering requirements - Expect to have to complete a wagering requirement on the bonus cash you receive, your winnings from the bonus cash, or at some casinos, both.

Wagering requirement time limit - Casinos often set a time limit to complete the wagering requirement before the bonus is forfeited. This can be anything from seven days to a month.

Casino bonus wagering requirements explained

The wagering requirement is the value you have to wager before you can withdraw the bonus amount or your winnings as cash. The wagering requirement can be calculated according to the bonus amount given, how much you’ve won using it, or both.

Wagering requirements differ from casino to casino. Low wagering casinos will impose playthrough requirements of between 10x and 30x, but they can be as high as 65x at some brands.

The good news is there are a growing number of UK online casino sites that impose no wagering requirements whatsoever – although the bonus value offered is usually much less, it is your money to play with and withdraw with no restrictions in place.

Calculating the wagering requirement on a 300% deposit bonus is pretty simple. Take the bonus amount claimed or your winnings from the bonus (check the T&Cs to see which it is) and multiply this by the wagering requirement

This gives you the total amount you have to wager before you can unlock your bonus or winnings as cash.

How to calculate the wagering requirement

If you're still not sure how to work out the wagering requirement, check out the example below.

You’re offered a 300% deposit match bonus up to £300 with a x30 wagering requirement on the bonus amount. You deposit £100 to claim the full £300 bonus match.

  • Bonus: £300
    Wagering requirement: x30
    Amount to be wagered: £300 x30 = £9,000

    This doesn’t mean you have to deposit and lose £9,000, just that you need to cycle through £9,000 worth of wagers at the casino before you can unlock the bonus money as cash. Or if the wagering requirement is applied to your winnings, your winnings as cash.

    Remember – you don’t have to claim a welcome bonus to sign up and play at an online casino. There are plenty of other factors to consider when deciding where to play and that ultimately will have a much bigger impact on the experience you receive.
An important word on responsible gambling

Online casino is fun and enjoyed by millions of people across the UK. But it’s important that it does stay fun and that you remain in control of your play. Because we only partner with UK-licenced online casinos, each of the brands listed on Comparasino offers the tools you need to do this.


But some of these tools might be unfamiliar and it can also be tough to determine if you, or a family member or friend, could potentially have a gambling problem. That’s why we’ve created a Safe Gaming Hub where you can find information about all the responsible gambling tools offered at online casinos, how they work and which ones might be best for you.


It also contains insights into some of the early signs of problem play to be aware of in yourself and others as well as direct access to charities and organisations that support those with problem gambling habits.

Head to the Safe Gaming Hub