Overlay: who pays the gap when a guarantee isn't met

The definition, and the arithmetic behind it

An overlay exists when a tournament’s guaranteed prize pool exceeds what the entry fees actually raise, and the room covers the difference. The standard worked example in poker glossaries: a guarantee of $10,000 against $8,000 collected from buy-ins leaves a $2,000 overlay funded by the operator. A compliance glossary describes the mechanism in its own language — a supplemental injection by the house to meet its contractual payout obligation.

The arithmetic from the player’s seat uses the lobby, not the marketing:

1. Find the prize-pool contribution per entry. The buy-in is split into the prize pool and the room’s fee. A $100 + $10 structure contributes $100; a flat "$109" entry has the split written in the tournament information tab.
2. Multiply by entries. Count re-entries as entries; they contribute again.
3. Subtract from the guarantee. A positive remainder is the overlay, and it is live until registration closes.

Where overlays come from

Three conditions produce them, and all three are structural rather than accidental.

A ring-fenced player pool. A guarantee sized for a busy market can misfire in a small one. This is why overlays appeared more often in single-state markets than they do where pools are merged — the subject of what shared liquidity merges.

A schedule that competes with itself. A room running a large guarantee at the same hour as a bigger event elsewhere, or alongside its own flagship, splits its own field.

A new series. Guarantees for an unproven schedule are estimates. Rooms take the risk deliberately, because a series that looks thin in its first year is hard to sell in its second.

What the operator’s side looks like

Overlay is a marketing cost with a known maximum: the guarantee minus the minimum plausible field. Rooms accept it because the alternative — advertising no guarantee — reduces registrations further, and because the players who chase overlays are the ones who register early, which is what the guarantee was designed to buy.

That also explains the pattern of guarantees quietly disappearing from a schedule rather than being cut: a reduced guarantee is a published admission, and an absent one is not.

Is chasing overlay actually worth it?

Yes, with two qualifications.

The value is real and it is additive: every dollar of overlay is a dollar in the prize pool that no player paid. Unlike an edge derived from opponents’ mistakes, it does not depend on how the field plays.

The qualifications: an overlay-heavy tournament is small, which flattens the payout structure and increases the share of the prize pool concentrated in the top places, so a player whose edge comes from deep runs gets more of the benefit than one who min-cashes. And an overlay of $25 per seat is immaterial if the game itself is one you are a losing player in — overlay reduces the rake burden, it does not create an edge where none exists. On how to measure that burden in the first place, see rake caps at micro stakes.

A practical routine for a series

• Open the lobby an hour before late registration closes rather than at the start. The field is nearly set, and the subtraction is accurate.
• Check the fee split once per series; it rarely changes between events in the same schedule.
• Look at the satellites. A satellite that awards more seats than its own entries justify is an overlay in a different currency, and it is the most commonly missed one.
• Note which events ran short this year. Guarantees are usually re-sized for the next edition, and this year’s overlay event is next year’s realistic target.

For who gets the paperwork when a final table makes a deal, see one prize, several winners; for the reporting line itself, the $2,000 W-2G threshold.

Which rooms run series in which state is on the room list and the multi-state poker page.