What Is Insurance in Blackjack?
Insurance is a controversial side bet offered in blackjack when the dealer's up card is an Ace. It is essentially a wager on whether the dealer has a natural blackjack. You can bet up to half of your original stake, and if the dealer does have blackjack, the insurance bet pays 2 to 1, which offsets the loss of your main bet.
While it may seem like a way to protect your hand, insurance is statistically a poor bet for the player in the long run. This article explains how the insurance bet works, why it carries a high house edge, and the rare situations where it might be considered by advantage players. Understanding this side bet is key to avoiding a common casino trap.
How the Insurance Bet Works
When the dealer shows an Ace, they will pause before checking their hole card and ask players if they want 'insurance.' Players can place a side bet, up to half of their original wager, by placing chips in the designated insurance area on the table. This bet is entirely separate from the outcome of the player's hand.
The dealer then checks their hole card. If they have a 10-value card, they have a blackjack. The insurance bet wins, paying 2:1, while the player's original main bet is lost (unless the player also has blackjack, resulting in a push). If the dealer does not have blackjack, the insurance bet loses, and play continues normally with the player's original hand.
The Mathematics and House Edge
Insurance is a simple bet on whether the dealer's hole card is a 10, Jack, Queen, or King. In a single deck, 16 of the remaining 51 cards are 10-value cards. This means the true odds of the dealer having blackjack are 16 to 35, or roughly 4.3 to 1 against. The casino, however, only pays 2 to 1 on the insurance bet.
This discrepancy creates a significant house edge. For a full deck, the house advantage on the insurance bet alone is approximately 5.9%. This makes it one of the worst bets on the casino floor. For players using basic strategy, taking insurance is never the correct mathematical play unless you are counting cards.
When Might Insurance Be Considered?
For the vast majority of players, the answer is never. The only exception is for skilled card counters. When the count is very high, indicating a disproportionate number of 10-value cards remaining in the shoe, the true odds of the dealer having blackjack can improve to the point where the insurance bet becomes positive expectation.
In this specific scenario, an advantage player might take insurance, or even 'take insurance for less' by betting a smaller amount than half their main bet if allowed. For recreational players without perfect card-counting skills, insurance is a sucker bet that should always be declined. Protecting a strong hand like 20 with insurance is a particularly costly mistake.
- Always decline insurance if you are not counting cards.
- Even with a blackjack yourself, taking insurance is -EV.
- Card counters only take insurance at a high true count (+3 or higher).
- The 'even money' offer on a player blackjack is just insurance in disguise.
Frequently Asked Questions
What is 'even money' on a blackjack?
If you have a natural blackjack and the dealer shows an Ace, you may be offered 'even money.' This is simply insurance. You are accepting a 1:1 payout on your blackjack immediately instead of risking a push if the dealer also has blackjack. Mathematically, it's the same bad bet as regular insurance.
Does insurance ever make sense with a strong hand?
No. The strength of your hand is irrelevant to the insurance bet, which is solely a wager on the dealer's hole card. The odds are the same whether you have 20 or 16. Using insurance to 'protect' a good hand is a common emotional mistake that increases the house edge.
Can you take insurance if you didn't get blackjack?
Yes, any player at the table can take the insurance side bet when the dealer's up card is an Ace, regardless of their own hand. You can be holding a 5 and a 6 and still make the insurance wager. It is a completely independent bet.
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