What are the rules if the player and the dealer both bust? The dealer then pays out all winning hands accordingly. If the dealer busts by exceeding 21 after taking a hit, all remaining hands that are at 21 or lower win their bet. What Happens if the Dealer Busts in Blackjack? If the upcard is an Ace – 11.65% chance of busting.If the upcard is a 10, Jack, Queen, or King – 21.43% chance of busting.If the upcard is a 9 – 23.34% chance of busting.If the upcard is an 8 – 23.86% chance of busting.If the upcard is a 7 – 25.99% chance of busting.If the upcard is a 6 – 42.08% chance of busting.If the upcard is a 5 – 42.89% chance of busting.If the upcard is a 4 – 40.28% chance of busting.If the upcard is a 3 – 37.56% chance of busting.If the upcard is a 2 – 35.30% chance of busting.Here are the odds of the dealer busting based on the dealer’s upcard: If the total of the cards in your hand or the dealer’s hand add up to more than 21, that is referred to as a bust. In the case of a dealer busting, everyone at the table that has not busted automatically wins their hand and their bet. The dealer also cannot go over 21 or they lose as well. What are the rules if the player and the dealer both bust?.What Happens if the Dealer Busts in Blackjack?.