How sportsbooks make money
The juice, the hold, the margin a sportsbook collects on a balanced book. Why books move lines, how they manage risk, and what that means for the bettor.
Sportsbooks are not in the prediction business. They are in the market-making business. The simplest model of a book is: quote a price on each side of a market that, in aggregate, attracts proportional money on each side, and collect a margin on every dollar handled. The more accurate your mental model of how the book operates, the easier the rest of betting becomes.
The juice (vig, hold)
On a two-sided market priced at -110 / -110, the implied probabilities sum to 110 / (110+100) + 110 / (110+100) = 52.4% + 52.4% = 104.8%. The 4.8 percentage points above 100 are the book's hold. That is what the book extracts on a perfectly balanced market regardless of who wins.
TWO-SIDED MARKET AT -110 / -110
$1.10 risked to win $1.00 on each side
$2,200 of total handle, balanced 50/50
1,100 on side A, 1,100 on side B
side A wins:
book pays 1,100 + 1,000 = 2,100
book keeps 1,100
book net 1,100 - 1,000 = +100
side B wins:
same math, book net +100
hold rate ≈ 100 / 2,200 = 4.5%On a perfectly balanced book, the sportsbook keeps roughly 4.5% of every dollar wagered through that line. In practice, books rarely run balanced (sharp money distorts the distribution) but the long-run average across all customers and all markets approaches the theoretical hold.
Why books move lines
When money lands lopsided, the book has two options: move the line, or accept the imbalance. Which option it chooses depends on whose money is creating the imbalance.
- Public money on a popular side. Books typically move the line less aggressively. The bettors are not believed to have an information edge, and the book is willing to take the risk in exchange for the margin.
- Sharp money on a side. Books move the line aggressively, sometimes before the action even hits the screen. The bettors are believed to have an information edge, and the book is repricing to avoid taking the wrong side of an informed trade.
- Both. The line moves a lot. This is the most common scenario in NFL primetime games.
The same market on different books can show different lines for the same game at the same moment. That dispersion is the source of edge from line shopping.
Hold percentages by market
| Market | Typical hold | Notes |
|---|---|---|
| NFL/NBA spread (sides) | 4 to 5% | Most efficient market on the board. |
| MLB moneyline | 3 to 5% | Cleanest pricing in major sports. |
| NFL/NBA total | 4 to 5% | Slightly higher hold on extreme totals. |
| NHL puck line | 5 to 7% | Lower liquidity, more dispersion across books. |
| Player props | 5 to 8% | High variance in hold across props. |
| Live in-game | 6 to 10% | Higher hold compensates for in-game risk. |
| Multi-leg parlay | 10 to 25% | Compounds with each added leg. |
| Season-long futures | 20 to 40% | Highest hold on the board. |
| Same-game parlay | 15 to 35% | Correlation adjustments add hidden hold. |
The pattern is consistent: the more correlated, exotic, or marketing-driven the bet, the higher the book's hold. Sharps live in the low-hold markets and tolerate the high-hold ones only when they have a quantitative edge that exceeds the hold.
Risk management at the book level
Books model their own risk position. A book that has taken heavy action on the home favorite in a primetime game is sitting on a position equivalent to being short the favorite. If the favorite wins, the book pays out heavily. If the favorite loses, the book wins big.
Books do not love that volatility. They prefer balanced action. But when they cannot get balance, they price into the imbalance, sometimes posting a line that is genuinely a 'we want the public to take the other side' price. Sharp bettors who notice the book's posture can find edge in fading the public flow that the book is trying to attract.
Limits and customer profiling
Most US books actively profile customers. A bettor who consistently beats the closing line will see lower limits, slower bet acceptance, and eventually a restricted account. This is not a secret. It is built into the operating model of most retail-facing books in the United States.
Books that want sharp action (Pinnacle, Circa, BetCRIS) operate on a different model. They take action from professional bettors at higher limits and use that action as price-discovery for their own line. Their hold is lower (around 2% on majors). They exist outside or alongside the consumer-facing books most US bettors interact with. See market makers and sharp books.
What this means for you
Three practical takeaways follow from how books actually work.
- Line shop. Books quote different prices on the same market. The difference is yours to capture if you maintain accounts at multiple books.
- Avoid the high-hold products. Parlays, teasers, futures, and exotics are designed to be margin-positive for the book on average. They compound juice.
- Track your CLV (closing line value). The closing line is the market's best estimate of probability. Beating the close is the only repeatable evidence that you are betting with positive expected value. See closing line value.