Blackjack Insurance — Why You Should Never Take It

When the dealer shows an Ace, you're offered insurance — a side bet that the dealer has blackjack. Basic strategy has a one-word answer: don't.

How insurance works

Insurance costs up to half your original bet and pays 2:1 if the dealer's hole card is a ten. So it is really a standalone bet on "is the next card a ten-value card?" — independent of the hand you're holding.

The math: why it loses

A ten-value card pays 2:1, so the bet only breaks even when more than one in three remaining cards is a ten. In a fresh shoe there are 16 ten-value cards out of 52 — about 30.8%, below the 33.3% you need. The bet carries a house edge of roughly 7%, far worse than the ~0.5% edge of the main game.

"Even money" is the same trap

If you have a blackjack and the dealer shows an Ace, taking "even money" is mathematically identical to insuring. Declining and playing it out wins more on average, because the dealer usually does not have blackjack.

The one exception (and why it isn't basic strategy)

Insurance only becomes +EV when the remaining shoe is rich in tens — which a card counter can detect. For everyone playing basic strategy without tracking the count, the answer is always no. Fullcount tracks every card, so it computes the live ten-density and the exact insurance EV for the current shoe:

More fundamentals in the basic strategy overview.