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---
type: "Bill"
title: "Generally revise and simplify income taxes"
description: "Generally revise and simplify income taxes"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2021"
identifier: "SB 399"
citation: "Montana SB 399 (2021)"
classification: ["bill"]
subjects: ["Revenue", "State", "Taxation (Generally)", "Taxation--Corporations", "Taxation--Individual Income"]
status: "enacted"
primary_sponsors: ["Greg Hertz"]
version_count: 5
action_count: 75
vote_count: 17
first_action: "2020-11-20"
last_action: "2021-05-12"
source: "openstates"
source_identifier: "ocd-bill/069a6266-4798-4934-9618-d0e37a600b93"
source_url: "http://laws.leg.mt.gov/legprd/LAW0210W$BSIV.ActionQuery?P_BILL_NO1=399&P_BLTP_BILL_TYP_CD=SB&Z_ACTION=Find&P_SESS=20211"
source_hash: "c52881a452d70f1787c33d710509791acbcd798007d2dc41d962d999397554bd"
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 SB 399 (2021) — Generally revise and simplify income taxes
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **SB0399_1.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/SB0399//SB0399_1.pdf)
2. **SB0399_2.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/SB0399//SB0399_2.pdf)
3. **SB0399_3.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/SB0399//SB0399_3.pdf)
4. **SB0399_X.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/SB0399//SB0399_X.pdf)
5. **Enrolled** (enrolled) — [source](https://leg.mt.gov/bills/2021/billpdf/SB0399.pdf)
## Votes
- Do Pass — **3020** (pass) · upper
- AMD-002 Dunwell D/PASS — **3465** (fail) · lower
- BE CONCURRED IN AS AMENDED — **117** (pass) · lower
- BE CONCURRED IN — **177** (pass) · lower
- Do Concur — **3020** (pass) · upper
- Do Concur — **6733** (pass) · lower
- DO PASS AS AMENDED — **65** (pass) · upper
- AMD-003 Cohenour D/PASS — **2327** (fail) · upper
- Do Concur — **3020** (pass) · upper
- Do Concur — **6731** (pass) · lower
- AMD-007 Cohenour D/PASS — **1931** (fail) · upper
- AMD-001 Olsen D/PASS — **3564** (fail) · lower
- Do Pass — **3020** (pass) · upper
- AMD-001 O'Brien D/PASS — **1931** (fail) · upper
- AMD-002 O'Brien D/PASS — **2129** (fail) · upper
- DO PASS — **127** (pass) · upper
- AMD-005 Pomnichowski D/PASS — **2228** (fail) · upper
## Sponsors
- Greg Hertz — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2020-11-20** Draft Request Received
- **2021-03-18** Draft to Requester for Review
- **2021-03-20** Draft Back for Requester Changes
- **2021-03-21** Draft in Legal Review
- **2021-03-22** Draft in Edit
- **2021-03-24** Draft to Drafter - Edit Review
- **2021-03-24** Draft in Input/Proofing
- **2021-03-25** Draft in Final Drafter Review
- **2021-03-25** Bill Draft Text Available Electronically
- **2021-03-25** Executive Director Review
- **2021-03-25** Draft in Assembly
- **2021-03-26** Draft Ready for Delivery
- **2021-03-26** Executive Director Final Review
- **2021-03-26** Draft Ready for Delivery
- **2021-03-26** Draft Delivered to Requester
- **2021-03-26** Introduced `introduction`
- **2021-03-26** Fiscal Note Requested
- **2021-03-26** First Reading `reading-1`
- **2021-03-26** Referred to Committee - (S) Taxation `referral-committee`
- **2021-03-26** Introduced Bill Text Available Electronically
- **2021-03-31** Fiscal Note Received
- **2021-03-31** Fiscal Note Printed
- **2021-03-31** Amendments Available
- **2021-04-01** Hearing - (S) Taxation
- **2021-04-01** Revised Fiscal Note Requested
- **2021-04-01** Committee Executive Action--Bill Passed as Amended - (S) Taxation `committee-passage`
- **2021-04-01** Committee Report--Bill Passed as Amended - (S) Taxation `committee-passage`
- **2021-04-01** Printed - New Version Available
- **2021-04-06** Revised Fiscal Note Received
- **2021-04-06** Revised Fiscal Note Printed
- **2021-04-06** Scheduled for 2nd Reading
- **2021-04-06** 2nd Reading Motion to Amend Failed `amendment-failure`
- **2021-04-06** 2nd Reading Motion to Amend Failed `amendment-failure`
- **2021-04-06** 2nd Reading Motion to Amend Failed `amendment-failure`
- **2021-04-06** 2nd Reading Motion to Amend Failed `amendment-failure`
- **2021-04-06** 2nd Reading Motion to Amend Failed `amendment-failure`
- **2021-04-06** 2nd Reading Passed `reading-2`
- **2021-04-06** Rereferred to Committee - (S) Finance and Claims `referral-committee`
- **2021-04-06** Committee Executive Action--Bill Passed - (S) Finance and Claims `committee-passage`
- **2021-04-06** Committee Report--Bill Passed - (S) Finance and Claims `committee-passage`
- **2021-04-07** Scheduled for 3rd Reading
- **2021-04-07** 3rd Reading Passed `passage, reading-3`
- **2021-04-07** Transmitted to House
- **2021-04-09** Referred to Committee - (H) Taxation `referral-committee`
- **2021-04-09** First Reading `reading-1`
- **2021-04-13** Hearing - (H) Taxation
- **2021-04-20** Committee Executive Action--Bill Concurred as Amended - (H) Taxation
- **2021-04-20** Committee Report--Bill Concurred as Amended - (H) Taxation
- **2021-04-20** Printed - New Version Available
- **2021-04-21** Revised Fiscal Note Requested
- **2021-04-22** Revised Fiscal Note Received
- **2021-04-22** Scheduled for 2nd Reading
- **2021-04-22** 2nd Reading Motion to Amend Failed `amendment-failure`
- **2021-04-22** 2nd Reading Motion to Amend Failed `amendment-failure`
- **2021-04-22** 2nd Reading Concurred `reading-2`
- **2021-04-22** Rereferred to Committee - (H) Appropriations `referral-committee`
- **2021-04-22** Hearing - (H) Appropriations
- **2021-04-22** Committee Executive Action--Bill Concurred - (H) Appropriations
- **2021-04-22** Revised Fiscal Note Printed
- **2021-04-23** Committee Report--Bill Concurred - (H) Appropriations
- **2021-04-26** Scheduled for 3rd Reading
- **2021-04-26** 3rd Reading Concurred `passage, reading-3`
- **2021-04-26** Returned to Senate with Amendments
- **2021-04-27** Scheduled for 2nd Reading
- **2021-04-27** 2nd Reading House Amendments Concurred `amendment-amendment, amendment-passage, reading-2`
- **2021-04-27** Scheduled for 3rd Reading
- **2021-04-27** 3rd Reading Passed as Amended by House `passage, reading-3`
- **2021-04-27** Sent to Enrolling
- **2021-05-02** Returned from Enrolling
- **2021-05-02** Printed - Enrolled Version Available
- **2021-05-04** Signed by President
- **2021-05-04** Signed by Speaker
- **2021-05-04** Transmitted to Governor `executive-receipt`
- **2021-05-06** Signed by Governor `executive-signature`
- **2021-05-12** 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/069a6266-4798-4934-9618-d0e37a600b93`. Confidence: reported (aggregated from official Montana legislature records).