Definition
Insurance is a side bet offered in Blackjack when the dealer’s up-card is an Ace. The bet pays 2 to 1 and is a wager on whether the dealer has a 10-value card in the hole, completing a “natural” Blackjack.
In context
The dealer deals you a King and a Jack (20) and deals themselves an Ace. The dealer then asks, “Insurance?” You place an additional bet equal to half your original wager on the insurance line. If the dealer flips over a Queen, you lose your original bet but win the insurance bet, essentially breaking even on the hand.
Why it matters
For the vast majority of players, insurance is a “sucker bet.” While it is marketed as a way to “protect” your hand, the mathematical odds are heavily in the casino’s favor. Understanding why insurance is a bad bet is one of the quickest ways for a beginner to improve their long-term Blackjack results.
Related terms
In detail
In my years on the casino floor, I’ve seen more money wasted on “Insurance” than almost any other side bet in the building. It is the perfect example of how casinos use emotional language—“protection,” “safety,” “insurance”—to sell a mathematically inferior product.
When the dealer shows an Ace, they will run their hand across the table and ask the players if they want insurance. It feels like a helpful suggestion. It’s not. It’s a bet that the dealer is holding a 10, J, Q, or K.
The Math of the “Sucker Bet”
Let’s break down the numbers to see why the house loves it when you take insurance. A standard deck has 52 cards.
- 16 of those cards are 10-values (10, J, Q, K).
- 36 of those cards are non-10s.
The ratio of non-10s to 10s is 2.25 to 1. However, the insurance bet only pays 2 to 1. In simpler terms: For every $1 you bet on insurance, the “fair” payout should be $2.25 based on the probability. By only paying you $2, the casino has created a massive house edge. In a standard multi-deck game, the house edge on the insurance bet is approximately 7.4%. Compare that to the base Blackjack house edge of ~0.5%, and you can see why the pit bosses smile when you take it.
The “Even Money” Trap
A variation of the insurance bet occurs when you have a Blackjack and the dealer shows an Ace. The dealer will ask, “Even money?” This is technically just an insurance bet in disguise.
- If you say “Yes,” you are paid 1-to-1 on your bet immediately, regardless of what the dealer has.
- If you say “No” and the dealer doesn’t have blackjack, you get paid 3-to-2.
- If you say “No” and the dealer does have blackjack, it’s a push (you win nothing).
Players hate the idea of having a Blackjack and winning nothing, so they take the “Even Money” to “be safe.” But mathematically, you are giving up a massive amount of long-term value. By refusing even money, you will win more money over 1,000 hands than if you took it every time.
When is Insurance Actually Good?
There is only one group of people who should ever take insurance: Card Counters. Card counters track the ratio of high cards to low cards remaining in the deck. If the deck is “rich” in 10-value cards (meaning a disproportionate number of 10s haven’t been dealt yet), the probability of the dealer having a Blackjack increases. When the “True Count” reaches a certain threshold (usually +3 in a standard game), the odds of the dealer having a 10-value card actually become better than 2-to-1. At that specific moment, insurance becomes a profitable bet. This is actually one of the primary “tells” we use in surveillance to identify card counters. If a player never takes insurance, but then suddenly places a large insurance bet when the deck is deep, we know they are likely counting.
The Psychological Aspect
Casinos know that players are “loss averse.” We feel the pain of a loss twice as strongly as the joy of a gain. The insurance bet preys on this. The player thinks, “I have a great hand (like a 20), and I don’t want to lose it to a dealer blackjack.” You have to train yourself to stop thinking about the “hand” and start thinking about the “volume.” You aren’t playing one hand of blackjack; you are playing a lifetime of blackjack. Over that lifetime, the 7.4% edge of the insurance bet will cost you thousands of dollars.
Summary
- Insurance is not a “wash”: It’s a separate bet on the dealer’s hole card.
- The math is bad: The payout (2:1) is lower than the probability (2.25:1).
- Ignore the name: It isn’t “protecting” your hand; it’s just adding a high-house-edge wager to your play.
- The “Pro” Rule: Unless you are counting cards and the deck is heavily weighted toward 10s, the answer to the dealer’s question is always “No.”