Dealer hits or stands on soft 17: what it does to the house edge
A dealer who hits soft 17 draws one more card on a hand such as ace and six, which cannot bust on that draw. It improves to 18 to 21 in 4 cases out of 13. So a hit-soft-17 table (H17) carries a higher house edge than a stand-soft-17 table (S17), other rules equal.
The rule in one sentence
A blackjack dealer has no choices: the drawing rule is printed in the table rules. Almost every table says the dealer draws on 16 or less and stops on a hard 17. The one variable is a "soft" 17, a 17 that contains an ace counted as eleven, such as ace and six.
At an S17 table the dealer stands on soft 17. At an H17 table the dealer takes another card. The wider reasoning for why the dealer's side of the table carries the margin is in the guide to where the blackjack house edge comes from.
Step 1: what a soft hand is
An ace is worth 11 unless that would take the hand over 21, in which case it is worth 1. A hand is soft while an ace is still counted as 11.
- Ace and six: 11 + 6 = 17, soft. Counting the ace as 1 gives 7.
- Ace, two and four: 11 + 2 + 4 = 17, soft.
- Ten and seven: 17, hard, because there is no ace to re-count.
The soft hand cannot bust on the next card. The worst case is a ten-value card, which turns ace and six into a hard 17 (1 + 6 + 10 = 17), not 27.
Step 2: one draw from ace and six
Use the usual simplification that every rank is equally likely on each draw, so there are 13 ranks with ten-value cards (ten, jack, queen, king) making 4 of the 13. Starting from ace and six, the dealer hitting soft 17 reaches these totals on the next card.
| Card drawn | Chance | Dealer total after the draw | What happens |
|---|---|---|---|
| Two | 1/13 | soft 19 | Stands |
| Three | 1/13 | soft 20 | Stands |
| Four | 1/13 | soft 21 | Stands |
| Ace | 1/13 | soft 18 | Stands |
| Ten-value | 4/13 | hard 17 | Stands |
| Five to nine | 5/13 | hard 12 to 16 | Must keep drawing |
Check: 1 + 1 + 1 + 1 + 4 + 5 = 13, so the six rows cover every case. The table follows from adding each card to 17 (ace and six) and re-counting the ace as 1 only when 11 would exceed 21.
Step 3: what the draw does to the dealer's result
Three things follow from the table, and each can be checked by counting.
- Improvement. The hand reaches 18, 19, 20 or 21 in 4 cases out of 13 (about 30.8%). Each of those beats a player holding 17 and ties or beats an 18.
- No change in 17. A ten-value card returns the hand to 17 in 4 cases out of 13. The dealer is exactly where S17 would have left it.
- Worse start, then more draws. In 5 cases out of 13 the dealer falls to a hard 12 to 16 and must draw again, with a real chance of busting. This is the only route by which hitting hurts the dealer.
The comparison is not "hit or stand with the same hand": it is a hand worth 17 now against a hand that either improves, stays at 17, or drops into a drawing hand. Rules that make a dealer total of 17 weaker or stronger decide the player's result on every hand in which the dealer reaches it.
Step 4: how often does it come up
The only soft 17 that can appear as the first two cards is ace and six. In the equal-rank model the chance is 2 × (1/13) × (1/13) = 2/169, about 1.18% of dealer hands. Soft 17 also arises after drawing (for example ace, two and four), so this is a lower bound on how often the rule is used.
Because it applies only to a small share of hands, the effect on the edge is small per hand. Across many hands it still repeats, which is why the rule appears in the standard list of items that move the edge.
How the player's decisions interact
A change in the dealer's drawing rule changes the best decisions too. Doubling and standing totals that were close under S17 shift slightly, because the dealer's weak totals no longer fall at the same places. The "basic strategy" for H17 is therefore a separate table from the one for S17, worked out by calculation for that rule set.
That is why this guide does not quote a single figure for the cost of H17. A number is valid only for a stated combination of decks, natural payout, doubling and splitting rules, and the player's strategy. The deck effect is covered in how the number of decks changes the blackjack house edge.
How to read it from a rules screen
- Find the line for the dealer's play. It reads "dealer stands on all 17s" or "dealer hits soft 17" in the rules.
- Read it with the natural payout. A 6 to 5 payout on naturals normally costs far more than the dealer's soft 17 rule.
- Look at the house edge or return figure the rules show for that table. It already includes the soft 17 rule.
- Treat side bets separately. They are priced on their own, as described in the guide to blackjack side bets.
Suppose, as an assumption only, that a table's other rules were identical and the H17 version carried a house edge 0.2 percentage points higher than the S17 version. On total stakes of KES 50,000 over a session, the expected extra cost would be 0.2% of KES 50,000 = KES 100. That expected figure is an average over many hands, and any single session can end well above or below it.
What the law asks operators to show
Regulation 20(2) of the Gambling Control (Conduct of Gambling Operations) Regulations, 2026 provides that a licensee "shall display clearly rules of games, odds, house edge and average return to the player". Regulation 20(3) applies the regulation to online gambling activities, with the necessary modification where applicable.
So the soft 17 rule belongs among the rules displayed for the game, and the displayed house edge is the number to use. How that average relates to what happens in one session is explained in the guide to expected value.
Where it sits among the rules
Dealer soft 17 is one entry in a list that includes the natural payout, the number of decks and the doubling and splitting limits. Each entry shifts the average result by a fraction of a percentage point or more, and none removes the house edge. The relationship between that edge and return to player is set out in how RTP and house edge work.
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Questions and answers
Is H17 or S17 better for the player?
S17 is better for the player, with every other rule held equal. Under H17 the dealer gets an extra chance to improve a 17 that would otherwise lose to any player total of 18 or more. The size of the change depends on the rest of the rules, so read the figure displayed for the table.
What exactly is a soft 17?
A soft 17 is a dealer total of 17 that includes an ace counted as eleven, for example ace and six, or ace, two and four. Counting that ace as one would give 7, so the hand is flexible: a ten-value card turns it into a hard 17, not a bust.
Can the dealer bust when hitting soft 17?
Not on that first draw. A soft 17 re-counts its ace as 1 whenever a card would take it past 21, so one card gives at worst a hard 17. A bust is possible only on a later draw from a hard total of 12 to 16.
Where is the dealer's soft 17 rule shown?
In the game rules. Regulation 20(2) of the Conduct of Gambling Operations Regulations, 2026 requires a licensee to display clearly the rules of games, odds, house edge and average return to the player, and regulation 20(3) applies this to online gambling with necessary modification.
Does the soft 17 rule matter in online and live-dealer blackjack?
Yes. It is a rule of the game, so it applies whether the cards come from a live shoe or a software shuffle. The same dealer rule is part of the rules listed for the table.