Best March Madness Betting Promos: $12K+ in Bonuses

I’ve compared the top offers from the best March Madness betting sites and apps so you can quickly find and claim one of the best March Madness sportsbook promos.

BetMGM stands out with the best overall March Madness betting promo for this year's tournament.  

I found the value of getting back up to $1,500 in bonus bets on a second-chance bet appealing, but the best part about the offer is that it's flexible. You can chase that homerun payout on your first March Madness bet or play it safe. The BetMGM welcome bonus gives you all sorts of great risk/reward scenarios to consider thanks to the backing of the second-chance offer.

Use our SI-verified BetMGM bonus code SI1500 to access to this leading March Madness promo today.

I've used my experience utilizing the best sportsbook promos to compile my list of the top March Madness welcome offers. Use my reviews to decide which of these bonuses to claim for the Sweet 16, Elite Eight, and Final Four.

1. BetMGM - Best total value for tournament
2. Caesars Sportsbook - Best March Madness bet match
3. FanDuel - Easiest March Madness bonus to claim
4. DraftKings - Biggest bet and get offer for March Matchups
5. Fanatics Sportsbook - Best guaranteed bonus for March Madness
6. bet365 - Best March Madness dual promo

🚨Note: Until the end of April, you can also claim an additional $50 in BetMGM Rewards Points when claiming the BetMGM bonus code.

Right now, bettors with BetMGM who use bonus code SIBONUS50 can claim a second-chance bet worth up to $1,500 as their welcome offer, to use on any college basketball game or player prop they choose.

💡SI Expert analysis: I love the $1,500 second-chance bet as it presents a great risk/reward opportunity for all bettors. A winning $1,500 wager at odds of +300 would yield a $4,500 profit, so risk-takers can make off with some big profits. You can also choose smaller bet sizes, such as $100, on your first wager, and still come out well ahead. 

For a deeper dive into this sportsbook, check out our BetMGM promo code and BetMGM review pages.  

The latest Caesars Sportsbook promo code is a unique bonus offer that awards new users numerous profit-boosting opportunities to build their bankroll. Specifically, when you claim the Caesars welcome offer for March Madness, you'll receive 10 100% profit boost tokens.

New users to Caesars Sportsbook can claim this offer now by inputting promo code SICZRDYW and registering via the links on this site.      

💡SI Expert analysis: The Caesars welcome offer is easy to qualify for and requires a simple wager of just $1 to unlock. Once you receive those Profit Boost Tokens, my view would be to build a few SGP wagers with payouts of up to +1000 or more, to see if you can't land a big winner right off the bat. 

We go into more detail in our Caesars Sportsbook promo code and Caesars Sportsbook review pages. You'll also learn why Caesars ranks as one of the top NFL betting sites.

New users who sign up with FanDuel during March Madness will receive up to $3,000 in bonus bets via No Sweat Tokens, which get distributed over your first 10 days on site. Each Token will provide a refund of up to $300 in bonus bets (per token) when you apply it to any bet. 

To register, new users on FanDuel simply need to tap a link on this site and complete their registration. There is no specific FanDuel promo code or complicated terms attached. 

💡SI Expert analysis: While betting for 10 days straight may feel daunting for beginners, the flexibility of the No Sweat Tokens means you can bet small on some days and still get great value from this offer. It's also perfect for the round-by-round nature of March Madness. This is an offer I would not wait on, as the bonus may not be available after March Madness.

You can get the full scoop in our FanDuel review and claim the FanDuel sign-up bonus today.

DraftKings has a solid welcome promo for new users: a "Bet $5, Get $200 in Bonus Bets" offer. I rate the DraftKings promo code as another strong option for March Matchup bettors, specifically anyone seeking a straightforward bet-and-get bonus with little investment required to unlock it.

Once the bonus bets are credited, they can be used across a wide range of NCAA betting markets, including popular props like rebounds and 3-pointers. 

💡SI Expert analysis: Getting your $200 in bonus bets in the Round of 32 will let you wager across multiple college basketball slates as you try to turn those bonus bets into profit. The initial wager requires only a $5 bet and includes a 100% Profit Boost on a March Matchup futures bet, giving you an added value proposition.

Be sure to claim the DraftKings promo code offer and see our DraftKings review for more details.

Important terms and conditions:

GAMBLING PROBLEM? CALL 1-800-GAMBLER or 1-800-MY-RESET, (800) 327-5050 or visit MA Gambling Helpline (MA). Call 877-8-HOPENY/text HOPENY (467369) (NY).

Please Gamble Responsibly. 888-789-7777/visit CONNECTICUT COUNCIL – ON PROBLEM GAMBLING (CT), or visit Home (MD), 1-800-981-0023 (PR).

21+ and present in most states. (18+ DC/KY/NH/PR/WY). Void in NH/OR/ONT/PR. Eligibility restrictions apply. On behalf of Boot Hill Casino (KS). Pass-thru of per-wager tax may apply in IL. 1 per new customer. $5+ first-time bet req. Max. $200 issued as non-withdrawable Bonus Bets that expire in 7 days (168 hours). Stake removed from payout. Terms: Promos | DraftKings Sportsbook. Ends 4/6/26 at 11:59 PM ET.

Bettors who claim the 'Up to $1,000 in FanCash' offer will have the ability to get one $100 bet match from Fanatics every day, for 10 straight days, a perfect bonus to use over the lengthy March Madness tournament in March and April.

Alternatively, new users on Fanatics can claim a bet of $5, get $200 in FanCash immediately, and offer, which requires less overall commitment and provides $200 in FanCash after you complete a wager of $5+ at odds of -500 or bigger. 

💡SI Expert analysis: My opinion is that the Fanatics 'Up to $1,000 in FanCash' welcome offer was made for big events like March Madness. Claiming the $1,000 offer at the start of the Tournament will ensure you don't run out of college basketball games to bet on as you clear the 10 consecutive days of bet matches. 

Our Fanatics Sportsbook review explores everything you need to know about the operator, including information on the Fanatics Sportsbook promo.

bet365 provides one of the best all-around March Madness welcome bonuses for U.S. bettors. As a new user, you can use the bonus code offer to claim one of two great promos.  

1. Bet $10, get $365 in bonus bets, win or lose: Get $365 in bonus bets, win or lose, just for placing a $10+ wager at odds of -500 or greater.
2. $1,000 First Bet Safety Net: Have the first bet you make on the site refunded in bonus bets up to $1,000 if it loses.

March Madness bettors can choose to take the guaranteed $365 in bonus bets, which requires very minimal investment, as it can be unlocked with a bet of $10+. 

Alternatively, when you choose the First Bet Safety Net promo, if your first wager loses, you’ll receive a refund in bonus bets that are equal to your stake, up to $1,000.  

💡SI Expert analysis: Take your time to decide which bet365 March Madness promo is best for you. Remember, you only have seven days to use your bonus bets after you receive them, so if you're a low-volume bettor, the bet $10, get $365 promo will be more suitable. 

You can also view our complete bet365 review for a deeper dive into the sportsbook, and check out our bet365 bonus offer page for all the latest deals.  

With the Tournament now entering the Sweet 16, there are still plenty of great March Madness sports betting promos to claim for current and existing users.  

I'll be updating this section daily with all of the existing user March Madness bonuses as they roll in, so make sure you bookmark this page before leaving. 

Here are our top three March Madness betting promos for existing users, for April 4, 2026.

1. FanDuel College Basketball Bonus Bet Drop: Get Bonus Bets to use on any March Madness College Basketball Games. Claim the bonus bets, and they're yours to use.
2. bet365 March Madness Early Payout: Get an automatic payout if your selected team takes a 15-point lead in-game.
3. DraftKings Mystery Offer: Unwrap your CBB mystery today.

What is the bet365 March Madness Early Payout?

With the bet365 Early Payout promo, you’ll get your Sweet 16 March Madness moneyline paid out early if your team takes a 15+ point lead at any time. This offer makes backing big underdogs an even more appealing proposition, since your team no longer needs to win the game for your bet to pay.

How the bet365 Early Payout for March Madness promo works

If you make a Sweet 16 moneyline bet and your side gets a 15-point or more lead, your bet will be labeled a winner. No waiting for the game to end or sweating over whether your team holds on. bet365 will pay out your bet instantly.

If you want to capitalize on this promo, targeting bigger plus-money bets and underdogs is a great way to do so. If your underdog seizes an early lead, you could end up landing a huge payout before the game even ends.

Getting started with a March Madness promo code is easy, even for first-timers.

Most of the best NCAA betting sites have similar registration processes, and we’ve outlined them to help you start betting before the games begin.

1. Choose a sportsbook

Browse the list of licensed U.S. sportsbooks on this page to find one that suits your needs. Compare aspects such as welcome bonuses, betting markets, ongoing promotions, and user experience. 

2. Download the sportsbook app

Once you've chosen a platform, click on one of our exclusive links to activate your bonus offer and begin the registration process. Afterward, download the sportsbook’s official app from the App Store or Google Play to finish setting up your account.

3. Register your account

Create an account by providing your personal details, including your name, email, phone number, address, date of birth, and the last four digits of your Social Security number. This information helps verify your identity, enhance account security, and ensure legal compliance.

4. Claim your welcome bonus

After setting up your account, you can claim the sportsbook’s welcome offer, which might include bonus bets, deposit matches, or other promotions for new users. Remember to enter our SI-verified promo code, if applicable, and review the terms, including eligibility requirements and expiration dates.

5. Deposit funds

Before you make your initial March Madness bet, ensure your account is funded. Most sportsbooks support various payment options, including debit cards, PayPal, Venmo, Apple Pay, and bank transfers.

6. Place your first bet

With your account funded, head to the March Madness betting section and review the odds for the wager you want to make. Enter your stake on the bet slip and confirm your selection; the odds and potential payout will adjust automatically.

7. Withdraw your winnings

Once your bet has settled, you can withdraw any winnings using available options such as debit cards, bank transfers, or PayPal. Withdrawal speeds differ by sportsbook; some can release funds in a few business days.

However, the best sportsbooks for payouts will likely complete your transaction in a few hours, depending on your chosen method.

When you're looking through our list of the top betting sites, you'll come to find that every March Madness sportsbook promo has unique terms and conditions, so it’s smart to review the details before getting involved. Knowing them well will set you apart from bettors who rely solely on promo hype.

We’ve identified the key mistakes to avoid when claiming bonuses on these sports betting sites.

🎲 Minimum odds

Many March Madness promo offers require your qualifying bet to meet a minimum betting odds threshold. This helps the sportsbook limit its exposure, and it is important to check the odds before placing your wager to ensure your bet qualifies.

💵 Wagering requirements

Some bonuses, particularly deposit matches or bonus bets, require a playthrough requirement, which means you'll have to wager the bonus amount a certain number of times before it can be withdrawn. Always review these terms carefully so you know exactly how much betting is needed to turn bonus funds into withdrawable cash.

⚠️ Bet limits

Sportsbooks may set minimum or maximum stakes for qualifying bets. For example, a promo might only apply to bets between $5 and $500, so placing a wager outside this range could disqualify you from the offer.

⏳ Bonus expiration timing

All promotional credits come with expiration dates. Whether they last a week, a month, or longer, it’s essential to use your bonus before it expires so you don’t lose its full value.

🔠 Eligible markets

Certain promos apply only to specific bet types, such as moneylines, spreads, totals, or player props. Double-checking which markets are eligible helps ensure your wager qualifies for the promo.

🇺🇸 State restrictions

Some offers are only valid in certain states due to local gambling laws. Make sure the promo you want to claim is available in your state before registering.

🤝 Trust and transparency

Trustworthy sportsbooks clearly spell out the full terms and conditions for each March Madness promo. Taking a moment to review these details before you bet helps you avoid misleading offers and ensures a safer, more reliable wagering experience.

When exploring March Madness betting promos, it helps to understand the most common types of welcome offers you’ll see. Each has its own rules and ideal use cases, so knowing the differences can make betting simpler and less confusing.

🎁 Bet and get

A “bet and get” offer rewards you with bonus credits after you place a qualifying wager. In most cases, the bonus is issued only after your initial bet settles and often comes with specific usage and rollover requirements, so be sure to review the terms before betting.

💎 Bonus bets

Bonus bets are site-funded credits you can use to place additional wagers. They typically can’t be withdrawn as cash on their own; only the winnings generated from them become withdrawable once they meet the sportsbook’s terms and conditions.

🚀 Odds boosts

Odds boosts increase the potential payout on selected markets without raising your stake. They’re typically applied to specific bets for a limited time, so it’s important to check the terms and any restrictions before opting in.

2️⃣ 👉 Second chance bets

Second-chance bets let you place a wager with reduced risk, as the sportsbook refunds your stake if it loses. These refunds are usually issued as bonus credits rather than cash and often come with expiration dates and usage terms, so be sure to review the details before you bet.

🛡️ Parlay insurance

Parlay insurance protects your multi-leg bet by offering a refund if only one selection loses. The refund is generally issued as bonus credits, helping reduce the impact of a near miss.

March Madness sportsbook promos are legal as long as you use a licensed sportsbook in the United States. For example, North Carolina bettors will be able to access March Madness promos on the best NC betting apps. Availability and the types of promotions offered vary by state because each state has its own regulations governing sports betting.

By sticking to licensed operators, you can safely take advantage of bonuses, odds boosts, and other game-day offers while remaining fully compliant with local laws.

When choosing a March Madness betting promo, selecting the right offer for your preferred bet type can maximize value. Here’s a quick guide to the top promotions for the most popular wagers.

At SI, we independently track the latest March Madness betting promos to ensure our information is accurate and up to date. Our approach focuses on transparency and reliability, so you can make informed decisions quickly. Key reasons to trust us include:

• Independent promo tracking
• Frequent updates
• Transparent terms breakdown
• No paid rankings

By following SI, you can compare March Madness promos with confidence and enjoy the 2026 NCAA Men's basketball tournament responsibly.