In Illinois, a bill becomes law by being filed in the House or Senate, read on three separate days and passed by a majority in each chamber, then sent to the Governor, who has 60 calendar days to sign it, veto it, or let it become law without a signature. That is the shape of how an Illinois bill becomes law, and the deadlines inside each step decide whether the change takes effect this year, next June, or not at all.
Filing and the Three-Reading Rule
A bill starts when a House or Senate member files it with the chamber clerk. House bills carry the prefix “HB” and Senate bills “SB,” followed by a number that identifies the bill for the rest of the two-year session.
The Illinois Constitution requires every bill to be read by title on three separate days in the chamber where it was filed before a final vote can happen. After the first reading, the presiding officer assigns the bill to a standing committee based on its subject: Judiciary, Appropriations, Revenue, or one of dozens of others. Each bill has to stick to a single subject, so a criminal sentencing change cannot be buried inside a highway funding measure.1Illinois General Assembly. Constitution of the State of Illinois – Article IV
If the committee advances the bill, it returns to the full chamber for a second reading, where any member can offer amendments. After the third reading comes debate and the roll call. Passage takes a majority of the members elected to the chamber: 60 votes in the 118-member House or 30 votes in the 59-member Senate.1Illinois General Assembly. Constitution of the State of Illinois – Article IV
Committees, Fiscal Notes, and Public Input
Committee hearings are where most bills die. Members question the sponsor, take testimony, and vote on whether to send the bill to the full chamber. Bills that never clear committee never get a floor vote.
Under the Illinois Fiscal Note Act, most bills that would spend state funds, change state revenue, or impose costs on local governments and school districts have to include a fiscal note estimating the impact before they can move forward. The sponsor requests the analysis from the relevant agency. The Department of Commerce and Economic Opportunity handles bills affecting local government finances, and the State Superintendent of Education handles bills affecting school districts.2Illinois General Assembly. Illinois Compiled Statutes 25 ILCS 50 – Fiscal Note Act Direct appropriations bills are exempt.
If you want a committee to hear your position, the most accessible option is filing a witness slip through the General Assembly’s website. It’s a short electronic form where you register support, opposition, or a neutral stance before a committee hearing, and you can submit one with or without creating an ILGA account.3Illinois General Assembly. Create Witness Slip Some committees also allow remote video testimony from witnesses approved in advance. Committee chairs do notice when slips pile up heavily on one side.
The Second Chamber and Reconciling Differences
Once a bill passes its first chamber, the other chamber runs it through the same three-reading process, with its own committee assignment, amendments, and floor vote. If the second chamber changes any of the text, the bill goes back to the original chamber for a concurrence vote, because the constitution requires both chambers to approve identical language before the bill can go any further.4Illinois Attorney General. Constitution – Effective Date of Laws Veto Override When the two chambers cannot agree, they can form a conference committee drawn from both houses to negotiate a compromise, which each chamber then votes on.
Filing Deadlines and Shell Bills
Each session sets a deadline for introducing new bills, typically in early February. For the 2026 Senate session, the deadline is February 6.5Illinois General Assembly. 104th General Assembly Senate Session Schedule After that date, new standalone bills generally cannot be filed.
The workaround is the shell bill. Leaders file placeholder measures before the deadline that make only a trivial change to existing law, like adding or deleting a single word, and the real substance gets amended in later. A bill that appears to do nothing meaningful may be a shell waiting for content. Transparency advocates have criticized the practice for letting major policy changes bypass early public review, but it is deeply embedded in how the General Assembly operates.
The Governor’s 60 Days
Once both chambers pass identical text, the bill goes to the Governor, who has 60 calendar days to act.1Illinois General Assembly. Constitution of the State of Illinois – Article IV Signing the bill gives it a Public Act number and adds it to the Illinois Compiled Statutes. If the Governor does nothing within those 60 days, the bill becomes law without a signature. Illinois has no pocket veto during session.
The Governor has four veto options:
- Total veto, which rejects the entire bill.
- Item veto, which strikes a specific line item from an appropriations bill.
- Reduction veto, which lowers the dollar amount of an appropriations item without eliminating it.
- Amendatory veto, which returns the bill to the legislature with recommended text changes rather than rejecting it.
Overriding a total or item veto takes a three-fifths vote in both chambers, meaning 71 in the House and 36 in the Senate, within 15 calendar days of the Governor returning the bill. A reduction veto is easier to reverse: restoring the original funding amount takes only a simple majority in each chamber. If the legislature does not restore the amount, the reduced figure becomes law.1Illinois General Assembly. Constitution of the State of Illinois – Article IV
The amendatory veto has two possible paths. The legislature can accept the Governor’s recommended changes by a simple majority in both chambers and send the bill back for the Governor to certify that the changes match. Or it can reject the recommendations and override the amendatory veto with the same three-fifths supermajority required for a total veto.1Illinois General Assembly. Constitution of the State of Illinois – Article IV
When a Signed Bill Actually Takes Effect
A signature is not the same as an effective date. Under Illinois law, any bill passed after May 31 of a calendar year defaults to a June 1 effective date the following year, unless the General Assembly passes it with a three-fifths supermajority in both chambers and specifies an earlier date in the bill’s text.6FindLaw. Illinois Effective Dates of Acts Bills passed before June 1 can carry any effective date the legislature chooses, without needing that supermajority.
The waiting period catches people off guard. A bill that passes in October 2026 with a simple majority is not enforceable until June 1, 2027, no matter how fast the Governor signs it. The effective date language usually sits in the final section of the bill, and that date is what decides when your obligations or rights actually change.
Looking Up and Tracking a Bill
Every Illinois bill has a prefix and number: HB or SB followed by digits, such as HB 1234. That identifier lets you search the General Assembly’s website at ilga.gov.7Illinois General Assembly. Illinois General Assembly Bill numbers reset each biennium, so you also need the right session. The current 104th General Assembly covers 2025 and 2026; a bill from 2024 belongs to the 103rd and lives in that older session.
The Bills and Resolutions search lets you pull up a bill by number, keyword, or sponsor. The results page shows committee assignments, amendment text, floor vote tallies, co-sponsors, and the date of each reading. For ongoing monitoring, the free My Legislation tool lets you register a username, build topic lists, and add bills by number or range. The system flags every status change: moving out of committee, receiving a floor vote, or heading to the Governor’s desk. Setting it up early in the session is worth the few minutes it takes.