Every parlay pays less than its fair price. The gap is the Parlay Tax: the share of a fair payout the book keeps. Put in how you usually bet and see what it adds up to.
Averages, not a forecast. Parlays swing a lot week to week; this is what the price costs you over time.
The payout a slip would have with no margin, from sharp-market odds, with legs that move together priced together.
1 − (book profit ÷ fair profit). A slip paying +600 when fair is +770 has a 22% tax.
Each leg carries the book's margin, and parlay payouts multiply it. Six −110 legs keep about 25% of the fair payout.
Want the exact number on your slip? Send us a screenshot. We'll reply with the fair price, the Parlay Tax and the cheapest book for the same slip.