Side bets and why they are a tax

Every side bet on a blackjack table is a separate game with its own independent house edge, and that edge is almost never below 3%.

Side bets are the casino's most effective tool for increasing revenue from a blackjack table without touching the main game's structure. A well-run basic strategy player with access to a 3:2 six-deck S17 game costs the casino roughly 0.50% of everything wagered. Adding a Perfect Pairs circle, a 21+3 circle, and a Lucky Ladies circle to the same table doesn't change the main game at all; it creates additional betting positions with house edges in the range of 4-25%. Players who enjoy the variety, who like the larger payouts on the occasional match, and who haven't looked at the numbers, will fill those circles cheerfully.

This is not a moral argument against side bets. They're legal, they're clearly disclosed in the paytable, and the entertainment value of a 26:1 payout on a Lucky Ladies hit is real. It's a numerical argument: the side bets cost significantly more per pound wagered than the main game, and anyone who has gone to the trouble of learning basic strategy has established that they care about edges. Knowing what each side bet actually costs is part of that same discipline.

Perfect Pairs

Perfect Pairs is the most widely deployed blackjack side bet in UK casinos. You find it at the Hippodrome, Aspers Westfield Stratford, and most major London floors. The bet pays based on whether your first two cards form a pair: a mixed pair (same rank, different colour) pays 5:1 or 6:1 depending on the paytable; a coloured pair (same rank, same colour, different suit) pays 12:1; a perfect pair (same rank, same suit) pays 25:1 or 30:1.

The problem is the paytable structure relative to the probability. In a six-deck shoe, the probability of a perfect pair is approximately 0.45%; the probability of any kind of pair is approximately 7.47%. the house edge calculates for a common six-deck configuration at approximately 6.0%. Some tables offer a more favourable paytable (higher payouts on mixed pairs) that brings this down toward 4%; others offer a less favourable version that approaches 8%.

The calculation for a session player making £5 Perfect Pairs bets at £25 minimum per hand: £5 x 50 hands/hour x 6% = £15 per hour in expected Perfect Pairs losses, against an expected main game cost of £25 x 50 x 0.50% = £6.25 per hour. The side bet costs over twice as much as the main game per hour despite being a fifth of the nominal wager size. Annabel's position is that you should know this number and then decide accordingly.

21+3: The Poker Overlay

21+3 creates a three-card poker hand from your first two cards and the dealer's up-card. Flush, straight, three of a kind, straight flush, and suited triple all pay at various multiples. The appeal is the poker narrative: you're looking for a combination you'd recognise from another game, which gives it more narrative interest than a simple pair.

The edges vary more than Perfect Pairs because there are multiple paytable configurations in circulation. Our analysis puts the six-deck edge at approximately 3.2% for a generous paytable and up to 6.5% for a less generous one. A suited triple (all three cards the same rank and suit) typically pays 100:1, which provides the occasional dramatic moment but doesn't materially change the underlying expectation.

21+3 is notable because it's mildly count-susceptible. A high true count modestly increases the probability of ten-heavy combinations in the three-card set. The counting edge on 21+3 is not large enough to make it a primary target for a skilled counter, but it explains why some counters take the 21+3 bet selectively at high counts as a modest edge play. The gain is small and the cover benefit (looking like a ploppy who enjoys side bets) may outweigh the edge consideration in some operational contexts.

Lucky Ladies and Buster Blackjack

Lucky Ladies is a side bet that pays when your first two cards total 20. The basic payout for any 20 is 4:1; the premium payouts are for specific 20s: a matched 20 (same rank and suit) pays 19:1 or 25:1, and a queen-queen matched is the jackpot pay (1,000:1 or 200:1 depending on the paytable). The house edge is severe. Our analysis covers the edge at approximately 17-25% for standard configurations. This is not a misprint. The game is built around a jackpot structure where the bulk of the return is concentrated in extremely rare events, and the ordinary return on non-jackpot hands is correspondingly poor. Lucky Ladies is the least favourable of the common UK blackjack side bets and the one that most clearly belongs in the same category as slot machine play rather than card game play.

Buster Blackjack takes a different angle: you bet that the dealer will bust. The payout scales with the number of cards in the dealer's busting hand (a higher card count in the bust hand pays more, with a 7-card bust typically paying 250:1 or similar). The house edge on standard Buster Blackjack configurations is approximately 6-8%, which puts it in the same range as Perfect Pairs. The bet is count-susceptible in the opposite direction from the main game: a low true count (ten-poor shoe) means the dealer is more likely to bust, which slightly improves the Buster Blackjack expectation. It's a minor effect and not typically worth pursuing as a primary play, but it's worth being aware of.

The logical frame for all of these: the side bets are available, the paytables are posted, and the edges are calculable. The basic strategy lesson established that you can play the main game to a 0.50% edge with correct play. Every pound diverted to a side bet is a pound playing at 4-25% house edge instead. Play the main game well. Take a side bet occasionally if it genuinely interests you. Don't take it because you feel vaguely obligated, and don't take it without knowing what it costs.

Key numbers

Sources: our in-house edge analysis, UKGC game rules requirements.