# Montana HB 539: Revise laws related to veto override polls

Montana HB 539, Revise laws related to veto override polls, is a 69th Legislature, Regular Session (2025) House bill sponsored by Bill Mercer (Republican); status became law, last action 2025-05-08 (Chapter Number Assigned) (as of 2026-10-11).

- Canonical: https://policyrisk.com/state-bill/MT-HB539-2025
- As of: 2026-10-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: Montana HB 539
- State: Montana
- Session: 69th Legislature, Regular Session (2025)
- Title: Revise laws related to veto override polls
- Status: became law
- Chamber: House
- Introduced: 2025-02-18
- Last action: 2025-05-08, Chapter Number Assigned
- Sponsor: Bill Mercer (Republican)
- Cosponsors: 1
- Subjects: Legislature, State Government
- Touches household money: no
- Roll calls: 4 (277 yes, 18 no in all)
- Economic provisions PRIA read: 3

## Summary

No summary available.

## Bill overview: provisions PRIA read

- Governor must file vetoes out-of-session: benefit, low. When the Legislature is not in session and the Governor vetoes a bill, the Governor sends the bill and reasons to the Secretary of State. The law takes effect on passage and approval, so these rules apply immediately.
- Legislature can reconvene on vetoes: benefit, low. The Legislature may use the state’s special-session rules to reconvene and reconsider a vetoed bill when it is not in session.
- Mail-in veto override with daily tallies: benefit, low. If the final vote was under two-thirds, within 5 working days the Secretary of State mails each legislator the bill title and veto message. If the final vote was at least two-thirds, within 5 working days the Secretary of State sends each legislator, by certified mail, the bill and veto message, a…

## Sponsors and cosponsors

- Sponsor: Bill Mercer (Republican), House
- Cosponsor: Denise Hayman (Democrat), Senate

## Roll call votes

| Date | Chamber | Motion | Result | Yes | No | Other |
| --- | --- | --- | --- | --- | --- | --- |
| 2025-04-15 | Senate | Do Concur | pass | 50 | 0 |   |
| 2025-04-14 | Senate | Do Concur | pass | 49 | 0 |   |
| 2025-03-07 | House | Do Pass | pass | 93 | 6 |   |
| 2025-03-05 | House | Do Pass | pass | 85 | 12 |   |

## Actions (23)

- 2025-05-08: Chapter Number Assigned (House)
- 2025-04-25: Transmitted to Governor (House)
- 2025-04-25: Signed by President (Senate)
- 2025-04-24: Signed by Speaker (House)
- 2025-04-17: Returned from Enrolling (House)
- 2025-04-15: Sent to Enrolling (House)
- 2025-04-15: 3rd Reading (Senate)
- 2025-04-14: 2nd Reading (Senate)
- 2025-04-09: Committee Report (Senate)
- 2025-04-09: Committee Executive Action (Senate)
- 2025-03-17: Hearing (Senate)
- 2025-03-14: Referred to Committee (Senate)
- 2025-03-14: 1st Reading (Senate)
- 2025-03-07: Transmitted to Senate (House)
- 2025-03-07: 3rd Reading (House)
- 2025-03-05: 2nd Reading (House)
- 2025-02-26: Committee Report (House)
- 2025-02-26: Committee Executive Action (House)
- 2025-02-24: Hearing (House)
- 2025-02-24: Hearing (House)
- 2025-02-19: 1st Reading (House)
- 2025-02-19: Referred to Committee (House)
- 2025-02-18: Introduced (House)

## Bill text

- Enrolled, 2025-04-16: [PDF](https://docs.legmt.gov/download-ticket?ticketId=b9b204c8-0954-40b9-ab8f-dcf3f9252da2)
- As Amended (Version 2), 2025-02-26: [PDF](https://docs.legmt.gov/download-ticket?ticketId=15739b14-17fd-4293-9cd3-310708f688fd)
- Introduced, 2025-02-18: [PDF](https://docs.legmt.gov/download-ticket?ticketId=19cd284b-768d-4312-8ff0-8850ce9ff0b0)

## Related bills

- SB 437: Revise definition of sex in Montana law (signed)
- HB 831: Increase elderly homeowner and renter income tax credit (vetoed)
- HB 628: Revise early literacy targeted intervention laws (vetoed)
- SB 410: Provide for Montana genomic security act (vetoed)
- SB 424: Revising the disabled veteran property tax assistance program (vetoed)
- SB 422: Generally revise laws relating to insurance coverage relating to cancer (vetoed)

## Sources
- [Enrolled (PDF)](https://docs.legmt.gov/download-ticket?ticketId=b9b204c8-0954-40b9-ab8f-dcf3f9252da2)
- [As Amended (Version 2) (PDF)](https://docs.legmt.gov/download-ticket?ticketId=15739b14-17fd-4293-9cd3-310708f688fd)
- [Introduced (PDF)](https://docs.legmt.gov/download-ticket?ticketId=19cd284b-768d-4312-8ff0-8850ce9ff0b0)

## Related
- [SB 437: Revise definition of sex in Montana law](https://policyrisk.com/state-bill/MT-SB437-2025)
- [HB 831: Increase elderly homeowner and renter income tax credit](https://policyrisk.com/state-bill/MT-HB831-2025)
- [HB 628: Revise early literacy targeted intervention laws](https://policyrisk.com/state-bill/MT-HB628-2025)
- [SB 410: Provide for Montana genomic security act](https://policyrisk.com/state-bill/MT-SB410-2025)
- [SB 424: Revising the disabled veteran property tax assistance program](https://policyrisk.com/state-bill/MT-SB424-2025)
- [SB 422: Generally revise laws relating to insurance coverage relating to cancer](https://policyrisk.com/state-bill/MT-SB422-2025)
- [Montana bills](https://policyrisk.com/states/montana/bills)
- [Montana state hub](https://policyrisk.com/states/montana)
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Source: PRIA, https://policyrisk.com/state-bill/MT-HB539-2025 (as of 2026-10-11).