The help centre page titled "Signing Up as an Individual" states the rule in two lines: you must "be 18 years or older" and "pass a document verification if requested." That is the shortest answer the platform gives.
There is also a longer answer, and it does not quite say the same thing. Kalshi's Member Agreement, in the version filed with the CFTC in July 2024 (v1.5), requires that an individual member "is of the age of majority in Your state of residence." So the help centre pins the floor at 18, and the Member Agreement pins it to whatever counts as adulthood where you live. Both documents are Kalshi's own. They put the rule differently, and anyone opening an account should know that going in. Kalshi may have updated the Member Agreement since July 2024; the version quoted here is the one filed with the CFTC on that date.
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Why two Kalshi documents give the age rule two different ways
The help centre is written to be read quickly. "Be 18 years or older" is the kind of sentence a new user needs to see in the sign-up flow, and that is exactly where Kalshi puts it, on the page titled "Signing Up as an Individual." It is the operational answer: this is what the account form checks against your date of birth.
The Member Agreement is doing something different. Section VI, "Representations and Warranties," sets out what you promise Kalshi every time you place an order or use the service. One of those warranties, for an individual, is that "You are of the age of majority in Your state of residence." That phrasing hands the specific age back to state law. It does not name a figure. It does not list states.
The two documents are not in conflict in any practical sense. A user who is 18 or older AND of the age of majority where they live clears both. But they are differently drafted, and the Member Agreement is the binding contract between a member and the exchange. The agreement itself calls Kalshi a "U.S. Commodity Futures Trading Commission (CFTC) designated contract market," in Section I. Worth knowing which document governs what.
What Kalshi actually verifies when you sign up
The sign-up help page is blunt about this: pass a document verification "if requested." Not every application is kicked to full ID review, and the help centre does not promise it will be. What the verification page does make clear is what the check involves when it runs.
The name and date of birth you enter must match a government-issued photo ID exactly. Driver's licence or passport are the accepted documents. Middle names on the ID go in the first-name field to avoid a mismatch. If your legal name has changed, through marriage or a court order, you have to upload the documentation of the change before Kalshi will update the account name and run ID verification. Addresses that are commercial in nature, or that are PO boxes, are not accepted.
The photo step is specific. When prompted, you take a live photo of the physical ID through the Kalshi app. You cannot upload one from your camera roll, and you cannot photograph a screen. On top of that, Kalshi says the CFTC may require additional documents such as proof of address, employment information, or source of funds to complete verification. The exchange is required to collect this information under US law and CFTC rules; the help centre says that explicitly. Our walkthrough of how to open a Kalshi account covers the same flow in more detail for new US users.
What age to use Kalshi, read against both documents
Take the two Kalshi documents together and the practical floor is straightforward. You need to be at least 18, and you need to be the age of majority in your state. Kalshi does not name any state or any figure. If you are not sure where your state sits on majority, the state statute is the authority, not the exchange.
The help centre does not describe an upper bound. Nothing in the pages read for this piece names a maximum age, and nothing suggests one.
Does Kalshi verify age, and how does Kalshi verify age
Yes. Kalshi verifies age through a document check, run "if requested" per the sign-up page, against a government-issued photo ID. The mechanism is the one described above: match the name and date of birth on the account to the ID, take a live photo of that ID through the app, and submit any further documents the CFTC requires. The verification page frames this as a regulatory requirement, not an optional step. US-based oversight obliges Kalshi to be able to verify the identity, and therefore the date of birth, of any person opening an account.
What the help centre does NOT say is that every account goes through full document review automatically. It says "if requested." So the honest version of the answer is: Kalshi has an age-verification mechanism, it is tied to a government-issued photo ID, and it runs when Kalshi asks for it.
What age can you use Kalshi, and does Kalshi have an age limit
The minimum under Kalshi's own documents is 18, from the help centre, combined with the Member Agreement's requirement that an individual be of the age of majority in their state of residence. Both have to be true at once for the warranties in Section VI to hold. There is no maximum age named in either source. If an upper bound exists elsewhere in Kalshi's rules, it is not in the pages read for this piece.
Where state court orders affect what Kalshi offers, not who can sign up
Age eligibility is a federal-regulatory and account-opening question. The state fights Kalshi is in are a different question: which contracts it can offer in which places. iPredicta's record of state court orders shows court orders against Kalshi's sports contracts in Nevada (a preliminary injunction of 18 May 2026), Michigan (an Ingham County Circuit Court order of 1 September 2026) and Washington (a King County Superior Court order of August 2026); in Massachusetts a Suffolk Superior Court preliminary injunction of 20 January 2026 was stayed by the Appeals Court on 18 February 2026 and the case awaits the Supreme Judicial Court.
None of those orders change the age rule. They change what Kalshi can list where. For the detail, see our write-ups on Kalshi in Nevada, Kalshi in Washington state, and the broader 50-state view on CFTC regulation and state access.
Polymarket US, by comparison
Polymarket US sets its minimum age in its Individual Participant and Clearing Member Agreement. The agreement requires that a participant "is a natural person, at least 18 years of age, having attained the age of majority in your state and/or country of residence, with the legal capacity to enter into this Agreement." The structure is close to Kalshi's Member Agreement wording: a hard floor of 18, plus the age of majority in the user's state or country, whichever applies. Both have to be true.
That is the only Polymarket entity this piece covers.
UK exchanges: Matchbook, the Gambling Act 2005, and the Gambling Commission
Same question, different legal plumbing. Matchbook's Terms and Conditions (stored copy of 31 October 2026) set the age rule in clauses 2.3, 2.4 and 3.1. Clause 2.3 says all applicants must be "over 18 years of age and of legal capacity or the age of majority in their jurisdiction (whichever is the highest)." Clause 2.4 says a user will not be able to deposit funds until Matchbook has carried out its age-verification checks. Clause 3.1 restates the age warranty where the user is located while using the site.
UK statute sits behind that. The Gambling Act 2005 defines, in section 45, a "child" as under 16 and a "young person" as 16 or 17. Section 46 makes it an offence for a person to "invite, cause or permit a child or young person to gamble," subject to narrow exceptions listed in the Act. Separately, the Gambling Commission's remote social responsibility code 3.2.11 requires that remote licensees have and implement policies to verify a customer's age before the customer can deposit any funds, access any free-to-play versions of the licensee's gambling games, or gamble using their own money, a free bet, or a bonus. That code applies to the remote licences the Commission issues.
No rule is stated here for Betfair or Smarkets: their terms were not read for this piece. For readers trying to compare the UK model with Kalshi's, our explainer on prediction markets and UK law walks through the regulatory frame in more detail.
The practical takeaway
If you are considering a Kalshi account, read Kalshi's own two documents and treat them as a pair, not as alternatives. The help centre tells you what the sign-up form will check. The Member Agreement tells you what you are warranting every time you trade. The verification page tells you what Kalshi can ask you for and how. Everything else, including state-level litigation over which contracts Kalshi can list, sits on top of that eligibility question rather than inside it.
Facts checked on 31 October 2026.
Frequently asked questions
What age do you have to be for Kalshi?
You have to be at least 18 and the age of majority in your state of residence. The 18 figure comes from Kalshi's help centre page "Signing Up as an Individual," which lists two eligibility criteria: be 18 or older, and pass a document verification if requested. The age-of-majority requirement comes from Kalshi's Member Agreement, Section VI, in the version filed with the CFTC in July 2024, which requires an individual member to warrant that they are of the age of majority in their state of residence. The two documents put the rule differently and both apply at once. Kalshi may have updated the Member Agreement since July 2024; the quoted version is the July 2024 filing.
Does Kalshi verify age?
Yes, Kalshi verifies age through a document check. The help centre says you must pass a document verification "if requested," which is the mechanism that confirms the date of birth you entered against a government-issued photo ID. The sign-up page frames this as a regulatory requirement under US law and CFTC rules, not an optional step. Not every application is sent to full review, going by the "if requested" phrasing. If verification is requested and you cannot pass it, you cannot complete sign-up. The exact documents and process are set out on the verification help page.
How does Kalshi verify age?
Kalshi verifies age by matching the name and date of birth you enter to a government-issued photo ID, specifically a driver's licence or a passport. When prompted, you take a live photo of the physical ID directly through the Kalshi app. You cannot upload one from your camera roll, and you cannot photograph a screen. If your name on the ID differs from your current legal name (for example after marriage or a court order), you have to provide the official documentation of that change before Kalshi will update the account name and run verification. Commercial addresses and PO boxes are not accepted. The CFTC may require additional documents such as proof of address, employment information, or source of funds.
Does Kalshi have an age limit?
There is a minimum but no maximum named in the Kalshi documents read for this piece. The help centre gives the floor as 18 or older, and the Member Agreement, in the version filed with the CFTC in July 2024, requires an individual member to be of the age of majority in their state of residence. Neither page nor the Member Agreement names an upper age bound. If a cap exists elsewhere in Kalshi's rules, it is not in the sources this article is based on.
What age to use Kalshi if the state age of majority is higher than 18?
You would need to meet the higher state figure to satisfy both documents at once. The help centre sets 18 as the floor, and the Member Agreement, Section VI, requires that you are of the age of majority in your state of residence; the warranty has to be true every time you trade. Where state law sets majority above 18, the Member Agreement effectively raises the Kalshi minimum for a user in that state. The exchange does not publish a state-by-state table of ages, and this article does not name one; the state statute is the authority. If in doubt, check your state's age-of-majority rule before opening an account.