What vig actually is
Vig is the commission a sportsbook charges on every bet, baked silently into the odds rather than collected as a separate fee. The word descends from vigorish, which itself came from the Yiddish vyigrysh — a loan from Russian meaning "winnings." It entered American English through early-20th-century New York gambling halls and has stayed in the language because no better word exists for the specific concept: a margin invisible at the moment of bet, visible only when you compare prices across books or strip the implied probability out of the line.
The sportsbook does not charge a ticket fee. It does not take a percentage from your winnings. It simply offers you a price slightly worse than fair — and that small price degradation, multiplied across millions of bets, is the entire business model. Vig is not a tip, a service charge, or a bonus mechanic; it is the only way sportsbooks make money, and understanding exactly how much vig you are paying on each bet is the single largest piece of edge available to the retail bettor.
The math of -110/-110
The most-quoted vig figure in sports betting is 4.55%, and it comes from the standard -110/-110 line. Convert each side to implied probability: -110 American is 110/210 = 52.38% implied. Two -110 sides together imply 104.76% — they sum to more than 100% because the book has charged a margin. The overround (the excess over 100%) is 4.76%. The bettor's per-bet hold — the share of every wagered dollar the book expects to keep on balanced action — is 4.76 / 104.76 = 4.55%.
That 4.55% is the floor of US sportsbook vig. Markets priced tighter than -110/-110 are rare and live at sharp-only books like Pinnacle. The number sounds small, but compound it across a season of 200 bets at flat stakes and the recreational bettor with no edge loses roughly nine units to vig alone — before any model error, bad beat, or bankroll mismanagement. For a $100/bet player that is $900 of pure friction in a single NFL season.
Vig by market — the real range
The headline 4.55% figure is misleading because it only applies to standard two-way markets at recreational vig levels. The actual range across products at major US books is dramatic — running from 2% on Pinnacle NFL spreads to 30% on a six-leg same-game parlay at a recreational sportsbook. The bettor's awareness of which products carry which vig levels is the difference between paying retail and paying wholesale across a betting career.
| Market | Book | Typical overround | Effective vig |
|---|---|---|---|
| NFL spread (-110/-110) | Pinnacle | 2.4-3.0% | ~2.5% |
| NFL spread (-110/-110) | DraftKings / FanDuel | 4.3-4.8% | ~4.4% |
| NFL moneyline | Pinnacle | 2.8-3.5% | ~3.0% |
| NFL moneyline | BetMGM / Caesars | 4.5-6.0% | ~5.0% |
| NBA total | Recreational books | 4.5-5.5% | ~4.8% |
| Player prop (binary) | Recreational books | 7-12% | ~9% |
| 3-leg SGP | Recreational books | 15-22% | ~18% |
| 6-leg SGP | Recreational books | 22-30% | ~26% |
| NFL futures (Super Bowl winner) | Recreational books | 130-145% (32 teams) | ~25-30% |
The progression is intentional. Sportsbooks profit most from the products that look most fun — props, parlays, futures — and they price them accordingly. The two-way spread is a loss-leader the book runs tight because sharps will arbitrage any wider price. The same-game parlay is the recreational casino, where casual money pays a third of every dollar wagered to the house.
How parlay vig compounds
The parlay is the bookmaker's most profitable product because vig compounds multiplicatively across legs. A single -110 leg carries 4.55% vig. Two legs do not carry 9.1% — they carry (1 - 0.9545²) = 8.9% on the parlay combination. Three legs carry 13.0%. Four legs carry 17.0%. Six legs cross 24%. The math is mechanical: the book takes its margin on every leg, and every leg compounds against the bettor.
The reason recreational marketing pushes parlays is not because they are higher-EV for the bettor — they are dramatically lower. It is because the bettor cannot see the vig compounding. The parlay screen shows one price, +650 or +1200, and the cognitive comparison is to a single big number ("could win $1,200 on $100"), not to the no-vig fair payout. The bettor who manually multiplies the decimal odds of each leg and compares to the offered price almost always finds a 5-15% gap. That gap is the parlay's vig. It is not hidden; it is just not labeled.
State tax pass-through — why New York lines are wider
States that legalized sports betting in the post-PASPA era set their own tax rates on gross gaming revenue, and the rates vary by an order of magnitude. Nevada sits at 6.75%. New Jersey charges 13% retail and 15% online. Pennsylvania imposes 36% on online wagering. New York set a 51% online rate when it legalized in 2022 — the highest in the country and far above any sustainable margin for a low-vig book.
The result is visible in the lines. A New York DraftKings NFL spread will sometimes price 4-7 cents wider than the same DraftKings spread offered in Nevada or Indiana. Same-game parlay margins in New York are visibly chunkier than in low-tax states. The bettor never sees a tax line item — they see slightly worse odds — but the math is unavoidable: a book paying 51% of its gross to the state cannot operate at the same margin as a book paying 6.75%. State tax structure is one of the under-discussed inputs to actual vig at major US books.
Exchanges and the alternative model
Betting exchanges — Betfair internationally, Prophet and Sporttrade in the regulated US — sidestep the vig problem entirely by changing the business model. Instead of bookmaker vs. bettor, the exchange matches bettor against bettor and charges a commission on net winnings (typically 2-5%). There is no overround on the underlying market because the bettors themselves are setting prices through their orders. The exchange's revenue is the commission, not the margin.
The effective vig on an exchange is dramatically lower than a traditional book — typically 1.5-3% on the matched market, against 4-5% at a recreational sportsbook and 25%+ on a parlay. The trade-off is liquidity (exchanges have fewer matched bets, particularly on US markets) and learning curve (the back/lay interface is unfamiliar to most US bettors). For the disciplined bettor who can find liquidity on the markets they want to bet, an exchange is the cheapest place to take a position. Betfair has been the de-facto sharp benchmark in international markets for two decades for this reason.
Closing the vig gap with line shopping
The single most reliable form of vig reduction available to retail bettors is line shopping. A bettor with five US books open finds different prices on the same market: one book shows +130, another +118, another +125, another +135, another -EV at +115. The bettor who places the bet at +135 is paying meaningfully less effective vig than the bettor who places at +118 — even though both books are technically priced at the same headline -110/-110 vig elsewhere on their menu.
The savings are not theoretical. Industry analyses by Pinnacle, academic surveys of US sportsbook line dispersion, and tracking services like OddsJam have all measured the same thing: across a 200-bet season, the bettor who takes the best of five books versus the bettor who plays one book picks up roughly 1.5-2.5% of total handle in EV. That is larger than the modeling edge most recreational bettors can build. Line shopping is the cheapest, most reliable, and most under-utilized form of vig reduction in retail betting, and the bettors who consistently beat the closing line almost always do it.
Vig in props and futures — the long tail
Player props and futures carry the highest vig in the standard sportsbook menu. A binary player prop (Will Player X score a touchdown? Yes / No) at a recreational US book typically prices with 7-12% overround. The book has more risk on these markets — sharp money can drive prop lines aggressively when they have information the book lacks — so the margin is wider to compensate. Multi-outcome props (anytime scorer, first scorer, exact final score) push margins past 15%.
Futures markets are even more extreme. A Super Bowl winner futures market with 32 teams listed typically sums to 130-145% implied probability — meaning the book has built 30-45% margin into the entire market. The bettor who places a futures bet at +1200 is paying roughly 25-30% effective vig depending on the team's true probability. Sharp bettors generally avoid futures except in specific circumstances (early-season value before the line tightens, or correlated hedges against a position elsewhere) precisely because the embedded vig is structurally punishing.
Vig vs. hold vs. theoretical hold
The bettor's terminology often blurs three closely related concepts that the book's accountants distinguish carefully. Vig is the margin built into a specific line — the 4.55% on -110/-110, the 18% on a 3-leg SGP. Hold is the percentage of total handle the book actually retained over a reporting period. Theoretical hold is the long-run expected hold assuming balanced action across the book's full schedule of markets.
Hold fluctuates wildly. New Jersey DGE monthly reports show sportsbook hold percentages ranging from below 5% in bad months (favorites covered, parlays hit) to above 10% in good months (chalk lost, parlays missed). The 12-month rolling hold across legal US markets typically settles between 7% and 9%, well above the theoretical 4.55% vig because parlays and props dominate handle by revenue. The book's actual margin is higher than the headline two-way vig because the product mix is weighted toward higher-vig markets — and that mix is itself the result of marketing decisions designed to push casual bettors toward the most profitable corners of the menu.
Practical checklist for managing vig
- Calculate the vig on every market before you bet. Sum the implied probabilities. The excess over 100% is your overround.
- Avoid same-game parlays unless you have a clear correlation thesis. Compounded vig at 18-26% is unbeatable across volume.
- Line shop across at least three books. The single largest EV improvement available to retail bettors.
- Treat futures and props as high-vig markets, not as standard wagers. Bet them when you have a specific edge, not as filler.
- Consider exchanges for high-volume play. A 2-3% commission beats 4-5% vig if liquidity is sufficient.
- Track your effective vig, not your bet count. A bettor placing 200 bets at 6% effective vig is paying more than a bettor placing 300 at 3% effective vig.
Sources & further reading
- Levitt, Steven D. "Why are gambling markets organised so differently from financial markets?" Economic Journal, 2004 — foundational analysis of bookmaker margin vs. exchange commission structures.
- Paul, Rodney J. & Weinbach, Andrew P. "Market efficiency and a profitable betting rule: Evidence from totals on professional football." Journal of Sports Economics, 2002 — public bettor behavior and book margin response.
- New Jersey Division of Gaming Enforcement — monthly Sports Wagering Revenue reports, 2018-2025, detailing handle, hold, and revenue by sportsbook operator.
- American Gaming Association — "State of the States 2024" report on US sports wagering tax structure by state.
- Pinnacle Betting Resources — public documentation on margin calculation methodology and the low-vig business model.