Understanding the Vig in Craps: Buying and Laying the Same Number Explained

One of the most misunderstood concepts in craps is the vig, also known as the casino commission. Many players believe the vig is a small, harmless fee for better odds. In reality, the vig is the casino’s entire edge on buy and lay bets—and when you examine it closely, it becomes impossible to ignore.

A perfect way to understand the vig is by analyzing a scenario where the math cancels out, but the loss still exists.

Let’s break it down.

What Is the Vig in Craps?

The vig is a commission the casino charges when you place a bet that pays true odds.

  • Buy bets and lay bets pay at true mathematical odds
  • True odds give the casino no advantage
  • To restore its edge, the casino charges a vig, typically 5%

The key insight is this:

The vig is not based on probability — it is a transaction cost.

The Scenario: Buying and Laying the 10

Consider the following setup:

  • Buy the 10 for $100
  • Lay the 10 for $200

Why these amounts?
Because they perfectly offset each other at true odds.

  • The 10 pays 2:1
  • The lay against the 10 pays 1:2

In theory, this creates a neutral position where the dice outcome shouldn’t matter.

But the vig changes everything.

Buy the 10 for $100 (How the Vig Works)

When you buy the 10:

  • You are betting $100
  • True odds payout: $200
  • Vig: 5% of $100 = $5
  • The vig is usually paid up front

Outcomes:

  • If the 10 hits: you win $200, but you already paid $5
    Net result: +$195
  • If a 7 hits: you lose the $100
    Net result: −$100 (vig already lost)

Lay the 10 for $200 (How the Vig Works)

When you lay the 10:

  • You risk $200 to win $100
  • Vig: 5% of the win
  • 5% of $100 = $5
  • The vig is charged only if the lay wins

Outcomes:

  • If a 7 hits: you win $100 − $5 vig
    Net result: +$95
  • If the 10 hits: you lose $200
    Net result: −$200

What Happens When You Combine Both Bets?

This is where the truth about the vig becomes obvious.

If the 10 Hits

  • Buy bet wins: +$200
  • Lay bet loses: −$200
  • Vig paid: −$5

Final result: −$5

If the 7 Hits

  • Buy bet loses: −$100
  • Lay bet wins: +$100
  • Buy vig: −$5
  • Lay vig: −$5

Final result: −$10

Why This Matters: The Vig Never Cancels

Mathematically:

  • The bets cancel each other
  • The probabilities cancel each other
  • The variance is neutralized

But the vig does not cancel.

This proves an important truth about craps:

The casino doesn’t need the dice to beat you — the vig does it automatically.

The Vig Is a Hidden Tax, Not a Bet

When you hedge, buy, or lay, you are not making a better bet. You are paying a fee to participate.

This example creates:

  • Zero casino risk
  • Zero player edge
  • A guaranteed loss equal to the vig

That’s why casinos allow:

  • Buy and lay bets
  • Hedging
  • Complex betting structures

The house edge is embedded in the commission, not the odds.

Key Takeaways for Smart Craps Players

  • The vig is the casino’s edge, not probability
  • True odds bets are neutral until the vig is added
  • Buying and laying the same number exposes the vig clearly
  • Any strategy that neutralizes risk exposes transaction costs

If you want to understand craps at a professional level, this concept is foundational.

Because once you see the vig clearly, you realize:

You’re not betting against the dice — you’re paying rent to the casino.

Gus Santos

Back to blog

Leave a comment