What Is Vig and How It Affects Your Long-Term Returns

Vig is juice. It's the take. The sports book doesn't make money on who wins or loses. It makes money on the vig. In 1985, a Nevada sports book manager told me vig is "the only certainty on a betting board." He was right then. He's right now.

Understand the mechanism. A bettor wants to wager on the Raiders at minus-5 points. The sports book quotes the line. The bettor says, "I'll take it." The book doesn't care if the Raiders win by 4 (bettor wins) or 6 (book wins). Either way, the book collects vig. Standard vig in Las Vegas is 10%. That means you have to risk $110 to win $100. Or $1,100 to win $1,000. The $10 spread per $100 wagered is vig.

Vig mathematically requires you to win more than half your bets to break even. Not 50%. More than 50%. If you win 50% of your bets and lose 50%, you're down vig. The math: Win $100 on half your bets. Lose $110 on the other half. Net result: minus $10. You need to win 52.38% of your wagers just to break even against 10% vig.

The history matters because it explains why vig persists. In the 1970s, Nevada sports books ran thin margins. 3-4% vig. Competition forced it down. Then offshore books opened in Panama. Then the internet. Suddenly, a Vegas book competing against a Caribbean operation couldn't force 10% vig anymore. But they could force 5-6%. Some markets dropped to 4.5%. The principle stayed constant: the book needs spread to survive. The spread is vig.

Historical Vig Movement

December 1980. Vig was 10-12% in Vegas. A professional bettor could make -110 bets because the spread was so wide that occasionally you'd see plus-money on bad teams. The Raiders were -5 at minus-110. The Patriots were +5 at plus-100. You could arbitrage. Buy Raiders at -110. Sell Patriots at +100. Wait for injury news. If it moved, profit. The vig width created opportunity. By 1995, vig tightened. The average spread narrowed to 8-9%. The books got smarter.

Now it's 2026. Standard vig is -110 (10% juice on sides). Totals run the same. Teasers, pleasers, and props fluctuate. A Super Bowl prop might be -120 vig (12% juice) because the book knows everyone's betting it. A niche NFL playoff prop might be -105 vig (5%) because the book's uncertain about the true line.

How vig compounds over time: You're a casual bettor. You place 10 bets a season. You win 55%. Better than the 52.38% breakeven threshold. You're profitable! Your total wagered is $11,000. You won 5.5 bets. At -110 vig, you profited $500 before vig. After vig, you profited maybe $300. The 10% spread silently ate $200 of your earnings. You never notice because you won. But vig took your money anyway.

For professional bettors, vig is an operational cost. A professional hitting 54% against -110 vig makes about 1.4% return on total wagered annually. That sounds small. It's not. On $100,000 wagered, that's $1,400 profit. On $1 million wagered, $14,000. Professionals track vig obsessively because they know: cutting vig from -110 to -105 adds 0.5 percentage points to their expected return. That's meaningful.

Where vig kills casual players: proposition betting. A prop bet might be -130 on one side, +110 on the other. The spread is 240 basis points. A casual player sees a bet they think is favorable and takes it at -130. They need to win 56.5% just to break even against that juice. Most casual players win 47-48%. Against 30% vig, they're down 10% annually.

Internet betting changed vig geography. A bettor in Nevada faces -110 vig. A bettor on DraftKings faces -110 on sides. A bettor on a Canadian site might see -108. Vig is the primary competition vector now. Books used to compete on access. Now they compete on juice. A -108 book steals bettors from -110 because the math is better. Margins compress. Vig becomes the entire differentiator.

The long-term effect: Vig is why most bettors lose. Not because they're unskilled. Because the math is uphill. You need to hit 52.38% just to break even. That's a high bar. Casuals hit 45%. Vig eats them. Semi-pros hit 53%. Vig takes most of their edge. Only the top percentile (54%+ hit rate) extract real profit after accounting for vig. Everyone else feeds the spread. The books know this. That's why vig is the only certainty.