---
type: "Bill"
title: "Revise laws related to veto override polls"
description: "Revise laws related to veto override polls"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2025"
identifier: "HB 539"
citation: "Montana HB 539 (2025)"
classification: ["bill"]
subjects: ["Legislature", "State Government"]
status: "enacted"
primary_sponsors: ["Bill Mercer"]
version_count: 30
action_count: 35
vote_count: 6
first_action: "2024-12-14T17:26:05+00:00"
last_action: "2025-05-08T19:09:06+00:00"
source: "openstates"
source_identifier: "ocd-bill/fe38cc8b-6c15-474c-8971-2b45dc224e4d"
source_url: "https://bills.legmt.gov/#/laws/bill/2/LC3445?open_tab=sum"
source_hash: "10942f535a5ac97c2bcbec775bcf0f12ada27d119ec91ba326845bb2184350e2"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mt"]
---

# Montana HB 539 (2025) — Revise laws related to veto override polls

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **HB0539.001.001_Amendments-in-Context_final-full.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=286720)
2. **HB0539_1(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=284370)
3. **HB0539_1(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288715)
4. **HB0539_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=283642)
5. **HB0539_2(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288717)
6. **HB0539_2(10).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=311687)
7. **HB0539_2(11).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=311691)
8. **HB0539_2(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288724)
9. **HB0539_2(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288850)
10. **HB0539_2(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288861)
11. **HB0539_2(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288862)
12. **HB0539_2(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288868)
13. **HB0539_2(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=293831)
14. **HB0539_2(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=293976)
15. **HB0539_2(9).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=306899)
16. **HB0539_2.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=288716)
17. **HB0539_X(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=311695)
18. **HB0539_X(10).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=324823)
19. **HB0539_X(11).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=326898)
20. **HB0539_X(12).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=327816)
21. **HB0539_X(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=311696)
22. **HB0539_X(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=312333)
23. **HB0539_X(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=312334)
24. **HB0539_X(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=317079)
25. **HB0539_X(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=320645)
26. **HB0539_X(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=322152)
27. **HB0539_X(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=322153)
28. **HB0539_X(9).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=322154)
29. **HB0539_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=311694)
30. **LC3445.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=281750)

## Votes

- Do Pass — **85–12** (pass) · lower
- Do Pass — **93–6** (pass) · lower
- Do Concur — **50–0** (pass) · upper
- do_pass_as_amended — **11–8** (pass) · lower
- be_concurred_in — **6–0** (pass) · upper
- Do Concur — **49–0** (pass) · upper

## Sponsors

- Bill Mercer — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2024-12-14T17:26:05+00:00** (LC) Drafter Assigned
- **2025-02-10T18:20:44+00:00** (LC) Draft in Legal Review
- **2025-02-10T23:29:18+00:00** (LC) Draft in Edit
- **2025-02-12T19:56:06+00:00** (LC) Draft in Input/Proofing
- **2025-02-13T12:57:51+00:00** (LC) Draft in Final Drafter Review
- **2025-02-13T13:48:06+00:00** (LC) Draft in Assembly
- **2025-02-17T14:43:22+00:00** (LC) Draft Ready for Delivery
- **2025-02-17T19:21:44+00:00** (LC) Draft Delivered to Requester
- **2025-02-18T19:11:40+00:00** (H) Introduced
- **2025-02-19T19:34:03+00:00** (H) Referred to Committee - (H) State Administration `referral-committee`
- **2025-02-19T19:52:09+00:00** (H) First Reading `reading-1`
- **2025-02-24T23:05:19+00:00** (H) Hearing - (H) State Administration
- **2025-02-24T23:13:26+00:00** (H) Hearing - (H) State Administration
- **2025-02-26T18:36:24+00:00** (H) Committee Executive Action--Bill Passed as Amended - (H) State Administration `committee-passage`
- **2025-02-26T22:28:00+00:00** (H) Committee Report--Bill Passed as Amended - (H) State Administration `committee-passage`
- **2025-03-05T20:00:00+00:00** (H) Scheduled for 2nd Reading `reading-2`
- **2025-03-05T22:36:00+00:00** (H) 2nd Reading Passed `reading-2, reading-2`
- **2025-03-07T15:00:00+00:00** (H) Scheduled for 3rd Reading `reading-3`
- **2025-03-07T16:51:00+00:00** (H) 3rd Reading Passed `passage, reading-3`
- **2025-03-07T18:00:00+00:00** (H) Transmitted to Senate
- **2025-03-14T23:06:17+00:00** (S) First Reading `reading-1`
- **2025-03-14T23:24:00+00:00** (S) Referred to Committee - (S) Legislative Administration `referral-committee`
- **2025-03-17T16:31:33+00:00** (S) Hearing - (S) Legislative Administration
- **2025-04-09T13:07:43+00:00** (S) Committee Executive Action--Bill Concurred - (S) Legislative Administration
- **2025-04-09T19:47:00+00:00** (S) Committee Report--Bill Concurred - (S) Legislative Administration
- **2025-04-14T16:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2025-04-14T16:48:00+00:00** (S) 2nd Reading Concurred `reading-2, reading-2`
- **2025-04-15T19:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2025-04-15T21:09:00+00:00** (S) 3rd Reading Concurred `passage, reading-3`
- **2025-04-15T21:10:44+00:00** (H) Sent to Enrolling
- **2025-04-17T13:29:06+00:00** (H) Returned from Enrolling
- **2025-04-24T23:00:29+00:00** (H) Signed by Speaker `passage`
- **2025-04-25T18:15:35+00:00** (S) Signed by President `passage`
- **2025-04-25T21:33:14+00:00** (H) Transmitted to Governor `executive-receipt`
- **2025-05-08T19:09:06+00:00** Chapter Number Assigned `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/fe38cc8b-6c15-474c-8971-2b45dc224e4d`. Confidence: reported (aggregated from official Montana legislature records).