When the dealer shows an ace, they pause the game and offer insurance. You may bet up to half your original wager that the dealer has a blackjack (a ten as the hole card). If they do, the insurance in blackjack pays 2:1. It sounds sensible – but blackjack insurance is almost never worth it. This article explains how the blackjack insurance bet works, why it loses long term, and the one real exception.
How blackjack insurance works
- The dealer deals – you get two cards, the dealer an ace up and a hole card.
- Before players act, the dealer asks "insurance?"
- You may place up to half your base bet on a separate insurance line.
- The dealer checks the hole card. A ten means blackjack – insurance pays 2:1, your base hand loses (or pushes on your own blackjack).
- No ten, and you lose the insurance and play your hand normally.
Crucially, insurance in blackjack has mathematically nothing to do with your own hand. It is a standalone side bet on whether the dealer's hole card is worth ten. The croupier calls it "insurance", but it insures nothing – it is a bet.
The math behind the insurance bet
For a 2:1 bet to be worthwhile, the hole card would need to be a ten more than 1 in 3 times (33.3%). In fact only 16 of 52 cards are tens – about 30.8%. That gap is the house edge on blackjack insurance:
- Break-even needs: 33.3% tens.
- Actual (fresh shoe): ≈ 30.8%.
- Result: house edge on the insurance bet ≈ 7.4% – one of the worst bets on the table.
For comparison, the base blackjack edge with perfect strategy is ~0.5%. Blackjack insurance is fifteen times as expensive. To take insurance in blackjack routinely wipes out the entire benefit of good basic strategy.
"Even money" is the same mistake
If you have a blackjack and the dealer shows an ace, they offer "even money" – an automatic insurance that pays you 1:1 immediately. Do the math: taking it gives a sure 1×. Declining pays 3:2 about 69% of the time and pushes ~31%, for an expected 1.035× – more than the guaranteed 1×. Even money is blackjack insurance in disguise; take the 3:2 and accept the occasional push.
Worked example
You bet $20 and insure for $10. If the dealer has blackjack, your base $20 loses but the $10 insurance pays $20 – net $0. If the dealer does not (about 69% of the time), the $10 insurance is gone before your real hand even plays out. That "break-even" feeling in the first case is exactly what makes the blackjack insurance bet so tempting – and, on balance, so costly.
The one exception: a high true count
Only a card counter who knows the shoe is rich in tens can play insurance profitably. At a true count of +3 or higher (Hi-Lo), the ten density rises enough to make the 2:1 payout positive. Without counting you know nothing about the remaining shoe – so the correct answer is simply: never take insurance. This holds for live and for online blackjack alike.
Why casinos push it so hard
Because it makes them money. With a ~7% edge, blackjack insurance is a reliable revenue stream, and the "what if he has it?" prompt adds psychological pressure. The answer is calm: your base outcome is already priced into basic strategy.
Insurance across blackjack variations
- US blackjack (hole card). Insurance offered on a dealer ace; edge ~7%. Strategy: never.
- European blackjack (ENHC). Often no insurance, since the dealer takes the second card later.
- Single deck. Insurance exists and is equally poor.
- Live-dealer online blackjack. Same offer, same answer: decline.
Insurance in blackjack: a quick recap
To recap the case against insurance in blackjack: the insurance bet is a side wager on the dealer's hole card, priced so the house keeps about 7%. Insurance in blackjack pays 2:1 but needs a one-in-three ten to break even, and the real rate is lower. Insurance in blackjack therefore loses over time for every player who is not counting. To take insurance in blackjack as a habit is to hand the casino a steady margin on top of your main blackjack bet. The only time insurance in blackjack turns positive is a high true count. Otherwise the one blackjack bet you should never make is this one – decline the insurance in blackjack and simply play your hand.
Taking insurance also contradicts basic blackjack strategy: every basic blackjack strategy chart marks the insurance cell as a decline, so a player following basic blackjack strategy never insures.
Blackjack insurance FAQ
Can I insure against a bust? No. Base blackjack only offers insurance against a dealer blackjack.
How much can I insure? Up to half your base bet.
Is it different in European blackjack? Many ENHC games drop insurance entirely.
The simplest blackjack rule
If you remember only one thing from every blackjack strategy article: never take insurance. It costs ~7% long term, feels helpful often, and helps mathematically almost never. The only exception is card counting – and real counters already know.
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