---
type: "Bill"
title: "Property tax: assessments; placement of certain whole-home generators on residential real property for medical purposes; exclude from assessment of true cash value. Amends secs. 14a, 27 & 34d of 1893 PA 206 (MCL 211.14a et seq.)."
description: "Property tax: assessments; placement of certain whole-home generators on residential real property for medical purposes; exclude from assessment of true cash value. Amends secs. 14a, 27 & 34d of 1893 PA 206 (MCL 211.14a et seq.)."
jurisdiction: "us/states/mi"
legislature: "Michigan Legislature"
session: "2021-2022"
identifier: "HB 4378"
citation: "Michigan HB 4378 (2021-2022)"
classification: ["bill"]
subjects: ["Property tax: assessments"]
status: "enacted"
primary_sponsors: ["Alex Garza"]
version_count: 5
action_count: 34
vote_count: 1
first_action: "2021-03-02T05:00:00+00:00"
last_action: "2022-12-08T05:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/dd858e2f-168f-435f-87e5-dcf2138ea0ff"
source_url: "http://legislature.mi.gov/doc.aspx?2021-HB-4378"
source_hash: "c4a41ac160dcf10bab322e5ce939cc2fae4dd215de17f3c9e5ce33f6fd3a3100"
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-mi"]
---

# Michigan HB 4378 (2021-2022) — Property tax: assessments; placement of certain whole-home generators on residential real property for medical purposes; exclude from assessment of true cash value. Amends secs. 14a, 27 & 34d of 1893 PA 206 (MCL 211.14a et seq.).

## Version chain

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

1. **As Passed by the House** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billengrossed/House/htm/2021-HEBH-4378.htm)
2. **As Passed by the Senate** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billengrossed/House/htm/2021-HEBS-4378.htm)
3. **House Concurred Bill** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billconcurred/House/htm/2021-HCB-4378.htm)
4. **House Introduced Bill** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billintroduced/House/htm/2021-HIB-4378.htm)
5. **Public Act** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/publicact/htm/2022-PA-0240.htm)

## Votes

- passed; given immediate effect Roll Call # 403 Yeas 107 Nays 2 Excused 0 Not Voting 1 — **107–2** (pass) · lower

## Sponsors

- Alex Garza — primary (person)
- Abraham Aiyash — cosponsor (person)
- Brenda Carter — cosponsor (person)
- Cynthia Johnson — cosponsor (person)
- David LaGrand — cosponsor (person)
- Felicia Brabec — cosponsor (person)
- Helena Scott — cosponsor (person)
- Karen Whitsett — cosponsor (person)
- Kevin Coleman — cosponsor (person)
- Kyra Harris Bolden — cosponsor (person)
- Mary Cavanagh — cosponsor (person)
- Padma Kuppa — cosponsor (person)
- Rachel Hood — cosponsor (person)
- Ronnie Peterson — cosponsor (person)
- Samantha Steckloff — cosponsor (person)
- Stephanie Young — cosponsor (person)
- Tenisha Yancey — cosponsor (person)
- Tullio Liberati — cosponsor (person)
- Tyrone Carter — cosponsor (person)

## Timeline

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

- **2021-03-02T05:00:00+00:00** introduced by Representative Alex Garza `introduction`
- **2021-03-02T05:00:00+00:00** read a first time `reading-1`
- **2021-03-02T05:00:00+00:00** referred to Committee on Local Government and Municipal Finance `referral-committee`
- **2021-03-03T05:00:00+00:00** bill electronically reproduced 03/02/2021
- **2021-05-26T04:00:00+00:00** reported with recommendation with substitute (H-1) `committee-passage`
- **2021-05-26T04:00:00+00:00** referred to second reading
- **2021-06-30T04:00:00+00:00** read a second time `reading-2`
- **2021-06-30T04:00:00+00:00** substitute (H-1) adopted
- **2021-06-30T04:00:00+00:00** placed on third reading
- **2021-06-30T04:00:00+00:00** placed on immediate passage
- **2021-06-30T04:00:00+00:00** read a third time `reading-3`
- **2021-06-30T04:00:00+00:00** passed; given immediate effect Roll Call # 403 Yeas 107 Nays 2 Excused 0 Not Voting 1 `passage`
- **2021-06-30T04:00:00+00:00** transmitted
- **2021-07-15T04:00:00+00:00** REFERRED TO COMMITTEE ON FINANCE `referral-committee`
- **2022-02-10T05:00:00+00:00** REPORTED FAVORABLY WITHOUT AMENDMENT `committee-passage`
- **2022-02-10T05:00:00+00:00** COMMITTEE RECOMMENDED IMMEDIATE EFFECT
- **2022-02-10T05:00:00+00:00** REFERRED TO COMMITTEE OF THE WHOLE `referral-committee`
- **2022-12-07T05:00:00+00:00** REPORTED BY COMMITTEE OF THE WHOLE FAVORABLY WITH SUBSTITUTE (S-3) `committee-passage`
- **2022-12-07T05:00:00+00:00** SUBSTITUTE (S-3) CONCURRED IN
- **2022-12-07T05:00:00+00:00** PLACED ON ORDER OF THIRD READING WITH SUBSTITUTE (S-3)
- **2022-12-07T05:00:00+00:00** RULES SUSPENDED
- **2022-12-07T05:00:00+00:00** PLACED ON IMMEDIATE PASSAGE
- **2022-12-07T05:00:00+00:00** PASSED; GIVEN IMMEDIATE EFFECT ROLL CALL # 530 YEAS 31 NAYS 0 EXCUSED 7 NOT VOTING 0 `passage`
- **2022-12-07T05:00:00+00:00** TITLE AMENDED
- **2022-12-07T05:00:00+00:00** returned from Senate with substitute (S-3) with immediate effect and title amendment
- **2022-12-07T05:00:00+00:00** laid over one day under the rules
- **2022-12-08T05:00:00+00:00** Senate substitute (S-3) concurred in
- **2022-12-08T05:00:00+00:00** roll call Roll Call # 502 Yeas 95 Nays 2 Excused 0 Not Voting 12
- **2022-12-08T05:00:00+00:00** title amendment agreed to
- **2022-12-08T05:00:00+00:00** bill ordered enrolled
- **2022-12-08T05:00:00+00:00** presented to the Governor 12/13/2022 11:46 AM `executive-receipt`
- **2022-12-08T05:00:00+00:00** approved by the Governor 12/13/2022 02:44 PM `executive-signature`
- **2022-12-08T05:00:00+00:00** filed with Secretary of State 12/14/2022 09:43 AM
- **2022-12-08T05:00:00+00:00** assigned PA 240'22 with immediate effect

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/dd858e2f-168f-435f-87e5-dcf2138ea0ff`. Confidence: reported (aggregated from official Michigan legislature records).