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---
type: "Bill"
title: "Revenue and taxation; certain income tax deduction; taxable years for which deductible allowable; effective date."
description: "Revenue and taxation; certain income tax deduction; taxable years for which deductible allowable; effective date."
jurisdiction: "us/states/ok"
legislature: "Oklahoma Legislature"
session: "2026"
identifier: "HB 4028"
citation: "Oklahoma HB 4028 (2026)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Caldwell (Trey)", "Hall"]
version_count: 6
action_count: 22
vote_count: 5
first_action: "2026-02-02"
last_action: "2026-05-04"
source: "openstates"
source_identifier: "ocd-bill/b6a9234c-ff7c-43b3-925a-a0fde445adbf"
source_url: "http://www.oklegislature.gov/BillInfo.aspx?Bill=HB4028&session=2600"
source_hash: "1b85ad97a70cf5f99255c61d8abe5d108ef8ddfab9063f40cad3b46806acdd99"
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-ok"]
---
# Oklahoma HB 4028 (2026) — Revenue and taxation; certain income tax deduction; taxable years for which deductible allowable; effective date.
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **Introduced** (filed) — [source](https://www.oklegislature.gov/cf_pdf/2025-26 INT/hB/HB4028 INT.PDF)
2. **Engrossed** (committee substitute) — [source](https://www.oklegislature.gov/cf_pdf/2025-26 ENGR/hB/HB4028 ENGR.PDF)
3. **Enrolled (final version)** (committee substitute) — [source](https://www.oklegislature.gov/cf_pdf/2025-26 ENR/hB/HB4028 ENR.PDF)
4. **Floor (House)** (committee substitute) — [source](https://www.oklegislature.gov/cf_pdf/2025-26 FLR/HFLR/HB4028 HFLR.PDF)
5. **House Committee Substitute** (committee substitute) — [source](https://www.oklegislature.gov/cf_pdf/2025-26 COMMITTEE SUBS/HCS/HB4028 CS.PDF)
6. **Proposed Committee Substitute (full committee) 1** (committee substitute) — [source](https://www.oklegislature.gov/cf_pdf/2025-26 COMMITTEE AMENDMENTS/House/HB4028 FULLPCS1 TREY CALDWELL-MKS.PDF)
## Votes
- Third Reading — **2620** (pass) · upper
- Joint Committee On Appropriations And Budget — **165** (pass) · upper
- Third Reading — **5427** (pass) · lower
- Jcr — **2720** (pass) · upper
- Joint Committee On Appropriations And Budget Committee: Do Pass As Amended By Cs — **236** (pass) · lower
## Sponsors
- Caldwell (Trey) — primary (person)
- Hall — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2026-02-02** First Reading `introduction, reading-1`
- **2026-02-02** Authored by Representative Caldwell (Trey), Kane
- **2026-02-02** Authored by Senator Hall (principal Senate author)
- **2026-02-02** Coauthored by Senator(s) Haste
- **2026-02-03** Second Reading referred to Joint Committee on Appropriations and Budget `reading-2, referral-committee`
- **2026-04-20** JCR; Do pass, amended by committee substitute Joint Committee on Appropriations and Budget `committee-passage`
- **2026-04-21** General Order
- **2026-04-21** JCR adopted
- **2026-04-21** Third Reading, Measure passed: Ayes: 54 Nays: 27 `passage, reading-3`
- **2026-04-21** Referred for engrossment
- **2026-04-21** Engrossed, signed, to Senate `passage`
- **2026-04-21** First Reading `introduction, reading-1`
- **2026-04-22** Direct to Calendar
- **2026-04-27** JCR adopted
- **2026-04-27** Ayes: 27 Nays: 20
- **2026-04-27** Measure passed: Ayes: 26 Nays: 20 `passage`
- **2026-04-27** Engrossed measure signed, returned to House `passage`
- **2026-04-27** Referred for enrollment
- **2026-04-27** Enrolled, signed, to Senate
- **2026-04-27** Enrolled measure signed, returned to House
- **2026-04-27** Sent to Governor `executive-receipt`
- **2026-05-04** Becomes law without Governor's signature 05/03/2026 `became-law`
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/b6a9234c-ff7c-43b3-925a-a0fde445adbf`. Confidence: reported (aggregated from official Oklahoma legislature records).