Why You Should Never Take Insurance in Blackjack

The dealer turns up an Ace, sweeps a hand over the table, and asks, "Insurance?" If you are holding a 20, the urge to protect it is strong. It feels safe. It feels smart. Mathematically, it is one of the worst bets on the casino floor.

The Illusion of "Protection"

The casino calls it "Insurance" for a reason - the word is doing psychological work. You are not protecting anything. Your original hand and the Insurance bet are completely independent transactions.

Insurance is a side bet that the dealer's hole card is a 10-value card (10, J, Q, or K). It costs half your original bet and pays 2:1. If you bet $10 on Insurance and the dealer has Blackjack, you win $20 - which offsets your $20 main-hand loss. That sounds appealing. Let's look at whether the payout is fair.

The Math: Why Insurance Is a Sucker Bet

Consider a freshly shuffled single deck with 52 cards. The dealer shows an Ace, so 51 cards remain unseen. Of those, exactly 16 are 10-value cards. The true odds of the hole card being a 10 are:

• Winning cards (10-value): 16
• Losing cards (non-10): 35
• True odds against winning: 35:16, or roughly 2.19 to 1

The casino pays you only 2 to 1. That gap - between the true 2.19:1 odds and the 2:1 payout - is where the house extracts its profit. In a single deck, the resulting house edge on the Insurance bet is approximately 5.9%.

For context: a basic strategy player facing a typical 6-deck shoe faces a house edge of roughly 0.4%–0.6%. Insurance offers the house an edge that is 12–18 times higher than the main game.

In a 6-deck shoe, the math shifts but the conclusion doesn't: there are 96 ten-value cards in 312 total cards. The dealer showing an Ace leaves 311 unseen cards, and all 96 tens are still among them. The true odds are 215:96, or about 2.24:1 - even worse than the single deck. The house edge on Insurance in a 6-deck shoe is about 7.4%, which is the figure that applies at most tables today. Still a losing bet.

The "Even Money" Trap

"Even Money" is Insurance in disguise. When you have a Blackjack and the dealer shows an Ace, the casino offers to pay you 1:1 immediately rather than risk a push. This is mathematically identical to taking Insurance on your existing Blackjack hand. The EV calculation is the same; the 7.4% house edge is the same.

Never take Even Money. If the dealer does have Blackjack, your hand pushes - you lose nothing. If they don't (and they usually won't), you collect the full 3:2 Blackjack payout. Long-term, refusing Even Money earns you significantly more.

The One Exception: Card Counting

There is exactly one scenario where Insurance becomes a profitable bet: when you are counting cards and the True Count is +3 or higher.

A high True Count means the remaining decks are disproportionately rich in 10-value cards. When the proportion of 10s in the remaining shoe exceeds roughly 1-in-3 (33.3%), the true odds of the dealer having a 10 hole card shift to better than 2:1 - and suddenly the 2:1 payout becomes profitable.

This is an index play in the Hi-Lo system - the #1 entry in the Illustrious 18 deviations: take Insurance when the True Count ≥ +3. Do not take it otherwise. The threshold is precise; guessing or "feeling" the deck is rich is not sufficient. If you're unsure how the true count differs from the running count, start with this conversion guide.

The Rule

If you are not actively card counting and tracking the True Count: Never take Insurance. Never take Even Money. Not when you have a great hand. Not when the table is running hot. Not when your gut says the dealer definitely has it. The math does not care about your gut.

Frequently Asked Questions