Best Sportsbook Promos for the 2026 NCAA Sweet 16 — Grab These Bonuses Now

The NCAA Tournament’s Sweet 16 tips off Thursday, March 27, and if you haven’t signed up at a sportsbook yet, there’s genuinely no better time to do it. Every major platform is running aggressive welcome offers right now, and as a new user you can claim thousands of dollars in bonus bets just by signing up and making your first wager.

But not all promos work the same way. Understanding the differences — guaranteed vs. win-conditional, bonus bets vs. cash, expiration windows — is what separates a savvy new bettor from someone who leaves money on the table. Let’s break down what’s available right now.

The Top Sportsbook Welcome Offers for March 2026

FanDuel Sportsbook: Up to $300 back in bonus bets, 10 days in a row

This is one of the most generous welcome structures in the industry right now. If your first bet loses, FanDuel gives you a Bet Reset token worth up to $300 — and it does this every day for 10 consecutive days. That’s up to $3,000 in total protection, covering the entire Sweet 16 and Elite Eight weekend. No promo code needed. Minimum deposit: $5. No minimum odds requirement.

BetMGM Sportsbook: First bet protection up to $1,500 (Bonus Code: TOPACTION)

If you want to make a bigger opening wager, BetMGM’s first-bet protection is the best offer for higher-stakes bettors. Bet up to $1,500, and if you lose, the entire amount comes back as bonus bets. For bets under $50, you get one bonus bet. For bets $50 or more, BetMGM issues five equal bonus bets totaling the amount you lost. Minimum deposit: $10.

bet365: Bet $10, get $365 in bonus bets — win or lose

Bet365’s offer is the rare “guaranteed” welcome bonus — you get $365 in bonus bets just for making a $10 qualifying wager, regardless of the outcome. That’s the gold standard for guaranteed value. bet365 is also known for strong odds and an “early payout” feature that settles your moneyline bet early if your team builds a big lead. Available in select states.

Caesars Sportsbook: Bet $1, double your winnings on your next 10 wagers

Caesars takes a different approach. Instead of bonus bets, they give you 10 Profit Boost Tokens after placing a first bet of just $1. Each token doubles your winnings on a wager up to $25. Spread across 10 bets during the Sweet 16 and Elite Eight, that’s significant extra value if you’re making smaller, frequent bets.

Fanatics Sportsbook: Bet $5, get $200 in FanCash instantly

Fanatics’ offer works similarly to DraftKings — bet $5, get $200 in FanCash whether your bet wins or loses. FanCash functions as bonus bets within the Fanatics ecosystem and is part of the brand’s broader rewards program. Note: FanCash isn’t the same as cash — it must be wagered before it’s withdrawable.

How to Choose the Right Promo for You

Here’s a simple framework based on your situation:

• If you want guaranteed value regardless of outcome: Go with bet365 ($365 win or lose) or DraftKings ($200 win or lose). These are the two truly guaranteed bet-and-get offers.
• If you want maximum protection on a bigger bet: BetMGM’s $1,500 first bet protection is the right call. Bet on a spread game you feel confident about and know you’re covered.
• If you want 10+ days of coverage through the entire tournament: FanDuel’s 10-day Bet Reset is built for March Madness. You can spread your bonus across all four remaining rounds.
• If you’re going to bet small amounts frequently: Caesars’ 10 Profit Boost Tokens add the most incremental value for smaller, regular bettors making $10-25 wagers.

Key Rules You Need to Understand

Bonus bets ≠ cash. When you win using bonus bets, you collect your winnings in real cash — but the bonus bet stake itself is not returned. So a $25 bonus bet on a +100 wager that wins gets you $25 in cash winnings, not $50.

Use them before they expire. Most bonus bets expire in 7 days. The Sweet 16 runs Thursday-Friday (March 27-28) and Saturday (Elite Eight begins March 29). Plan your usage accordingly.

Read the terms for your state. Some promos vary by state. New York, for example, often has different offer structures. Always confirm the offer is valid in your location before depositing.

Enjoy the games. Sweet 16 is what March Madness is all about — and with a bonus in your pocket, it’s even more fun.