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How tribal casinos work

Tribes regulate gaming on Indian lands under the Indian Gaming Regulatory Act. Class III needs a Tribal-State compact that is in effect. Not a state commercial licence. Not legal advice.

Answer first

90s

Class	What the statute covers	Who must compact
Class I	Social games of minimal value, or traditional ceremonial gaming	No compact. The tribe regulates.
Class II	Bingo (aids allowed) and non-banked cards. Not slot machines.	No compact. Ordinance approved by NIGC.
Class III	All gaming that is not Class I or Class II	Tribe and state. Compact must be in effect.

Progress

Tribe, NIGC, and the state

1
Tribal nation
Primary regulator for Class I, II, and III
2
NIGC
Approves ordinances; shares Class II and limited Class III
3
State
Class III compact partner — not the Class I or II licensor
4
Interior
Compact takes effect when approval notice is published

NIGC history: before Class III, the tribe and the state must have negotiated a compact approved by the Secretary of the Interior, or the Secretary must have approved regulatory procedures.

Floor rules

Rules that change by class

Know before you sit

Exclusive right, with limits: Congress found that Indian tribes have the exclusive right to regulate gaming activity on Indian lands if federal law does not specifically prohibit it and the state does not, as criminal law and public policy, prohibit that gaming. 25 U.S.C. §2701(5).
Indian lands: All land inside a reservation, plus trust or restricted land where the tribe exercises governmental power. 25 U.S.C. §2703(4). A state commercial casino off those lands is a different licence.
Class II is not slots: Class II does not include electronic or electromechanical facsimiles of any game of chance or slot machines of any kind. Bingo may still use electronic, computer, or other technologic aids. 25 U.S.C. §2703(7).
Class III only if lawful: Class III on Indian lands is lawful only if a tribal ordinance approved by the NIGC Chairman authorizes it, the state permits that gaming, and it is conducted in conformance with a Tribal-State compact that is in effect. 25 U.S.C. §2710(d)(1).
Compact in effect: The compact takes effect only when the Secretary of the Interior publishes notice of approval in the Federal Register. If the Secretary does not act within 45 days, it is considered approved only so far as it matches the Act, and notice is still published. §2710(d)(3)(B), (d)(8).

At the door

Four signals on the statute

Gate pass

21+

Ceremonial or social
Class I is social games solely for prizes of minimal value, or traditional Indian gaming tied to ceremonies. The tribe regulates it.
Bingo lane
Bingo, including technologic aids, plus same-location games similar to bingo, and non-banked card games. Slot machines are outside this class.
House-banked games
NIGC history: slot machines, blackjack, craps, and roulette fall here, with any electronic facsimile of a game of chance.
State must sign
Only Class III needs a Tribal-State compact that is in effect. Class I and Class II do not.

I, II, III, and CMP name classes and the compact. The 21+ chip on this gate pass is shared visit chrome — this page does not state a tribal door age.

Sequence

How Class III becomes lawful

Step 01
The tribe adopts an ordinance
The governing body adopts an ordinance or resolution that meets §2710(b) and submits it to the NIGC Chairman.
Step 02
The Chairman approves it
The Chairman approves unless adoption broke the tribe’s governing documents or undue influence is found, then publishes the approval in the Federal Register.
Step 03
The tribe asks the state
The tribe requests compact negotiations. The statute says the state shall negotiate in good faith. This page does not recite any compact’s terms.
Step 04
Interior publishes notice
The compact is in effect only after the Secretary publishes notice of approval. A 45-day silence counts as approval only to the extent the compact matches IGRA.
Step 05
The tribe stays primary
NIGC’s violation page: tribes are the primary regulators for Class I, II, and III. The state shares Class III matters tied to the compact.

Watch outs

Mistakes that mix the lanes

01One licence for every US casino
There is no national commercial casino permit. Tribal gaming uses IGRA plus the tribe. State floors use that state’s gaming board. NIGC says only tribal gaming is regulated to this extent.
02Calling Class II machines slots
The statute excludes slot machines and electronic facsimiles from Class II. NIGC’s history page repeats the exclusion. Those games, when offered, are Class III and need a compact.
03Inventing compact terms
What games, fees, or oversight a compact includes is that tribe-and-state document. This page states only the federal on-switch: ordinance, state permission, compact in effect.
04Skipping the tribal commission
For a prize dispute, NIGC says start with casino management, follow the tribe’s procedure, then the tribal gaming commission. NIGC usually refers the report back to that regulator.
05Reading industry revenue as a paycheck
NIGC’s 21 July 2026 release: FY2025 gross gaming revenue was $46.2 billion, from 545 establishments, 246 tribes, 29 states. That is amount wagered minus winnings returned to players — an industry total.

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01How the statute splits the floor

How do tribal casinos work?

A federally recognized tribe regulates gaming on its Indian lands under the Indian Gaming Regulatory Act of 1988 (Public Law 100-497, 25 U.S.C. §2701 and following). The Act sets three classes. The tribe is the primary regulator for each class. Class III also needs a Tribal-State compact that is in effect. This is orientation, not legal advice.

Who has the exclusive right to regulate gaming on Indian lands?

25 U.S.C. §2701(5): Indian tribes have the exclusive right to regulate gaming activity on Indian lands if the gaming is not specifically prohibited by federal law and is conducted in a state which does not, as a matter of criminal law and public policy, prohibit that gaming. Class III still has to meet the compact test in §2710.

What is a Tribal-State compact?

It is the agreement between the tribe and the state that governs Class III gaming on that tribe’s Indian lands. It takes effect only when the Secretary of the Interior publishes notice of approval in the Federal Register. NIGC’s history page also allows regulatory procedures the Secretary approved. This page does not summarize any one compact.

Are Class II machines legally slot machines?

No. 25 U.S.C. §2703(7)(B) says class II does not include electronic or electromechanical facsimiles of any game of chance or slot machines of any kind. NIGC’s history page states the same exclusion. Bingo can use electronic, computer, or other technologic aids and remain Class II. Slot machines are Class III.

Who regulates Indian casinos day to day?

NIGC’s report-a-violation page: tribes are the primary regulators and have jurisdiction over Class I, II, and III. NIGC shares jurisdiction with tribes over Class II and limited Class III matters. The tribe and the state share Class III matters related to internal controls, compacted games, and patron disputes from those games. The United States Attorney has criminal jurisdiction.

What did NIGC report for fiscal year 2025?

On 21 July 2026 the National Indian Gaming Commission announced gross gaming revenues of $46.2 billion for fiscal year 2025, from independently audited statements of 545 gaming establishments operated by 246 tribes across 29 states. NIGC defines gross gaming revenue as the amount wagered minus winnings returned to players. That figure is not a payment to any person.

Sources

25 U.S.C. §2701 — IGRA findings (2023 edition) · accessed Oct 12, 2026Exclusive right to regulate gaming on Indian lands, with the federal-law and state-policy limits in paragraph (5). Short title: Indian Gaming Regulatory Act.
25 U.S.C. §2703 — class definitions · accessed Oct 12, 2026Class I, Class II (including the slot-machine and facsimile exclusion), Class III, and Indian lands.
25 U.S.C. §2710 — Class III and compacts · accessed Oct 12, 2026Class III lawful only in conformance with a Tribal-State compact that is in effect; Secretary approval and Federal Register notice.
NIGC — History · accessed Oct 12, 2026Three classes, Class II exclusion of slot machines and electronic facsimiles, and the three Class III conditions including Interior approval.
NIGC — FY 2025 gross gaming revenue · accessed Oct 12, 202621 July 2026 release: $46.2 billion, 545 establishments, 246 tribes, 29 states.
NIGC — Report a violation · accessed Oct 12, 2026Tribes are the primary regulators for Class I, II, and III; patron disputes start with the casino and the tribal gaming commission.