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Portrait of Zach DiekenPhoto: legis.iowa.gov

IA · Officeholder

Zach Dieken

RState Representative · District 5

Votes by issue

Their recorded votes on bills that divided the chamber (unanimous votes left out), grouped by topic. A bill can sit under more than one topic. "With" and "against" compare each vote with how most Republicans voted. How topics are assigned

Where they stood out

Voted against most of their party on 7 of 194 party-divided votes on file.

Most often on: Education & families (4), Rights & public safety (2), Climate & energy (1)

  • Relating to the district-to-community college sharing or concurrent enrollment program

    What it does: On the version voted Feb 24, 2026: Requires a student or their parent or guardian, if the school asks, to repay the school the amount it paid a community college for a concurrent enrollment course the student fails.

    Voted no · most Republicans voted yes · Democrats 2–26, Republicans 60–5

    Apr 14, 2026Official record ↗

  • Relating to agriculture, including by providing for the powers and duties of the department of agriculture and land stewardship, including the promotion and regulation of commodities and products; the regulation of the transportation of agricultural commodities; the use of agricultural land; and taxation, including property taxes, excise and sales taxes, and income taxes; making penalties applicable; and including effective date and applicability provisions

    Amends the bill to add rules for proprietary onsite wastewater treatment systems: maintenance contracts with certified technicians renewed annually or biannually, annual or twice-yearly inspections, reports to the DNR with a public database, and a DNR study with a report due January 10, 2028. (AI-written)

    What it does: Makes broad changes to agriculture law: creates dollar-for-dollar matching funds for schools buying Iowa farm products and grants for small meat processors, allows permitted milk trucks up to 136,000 pounds, repeals t…

    Voted no · most Republicans voted yes · Democrats 5–19, Republicans 36–29

    Apr 8, 2026Official record ↗

  • Relating to interest rates and charges on regulated loans, and consumer credit transaction service charges

    What it does: On the version voted Apr 7, 2026: Replaces tiered interest caps on regulated consumer loans with a single maximum of 3% per month, and changes the cap on consumer credit service charges from the lesser of 10% or $30 t…

    Voted no · most Republicans voted yes · Democrats 3–25, Republicans 59–4

    Mar 12, 2026Official record ↗

  • Relating to criminal investigation, including the extension of DNA submission requirements to persons arrested for a felony or aggravated misdemeanor

    What it does: Requires people arrested for a felony or violent aggravated misdemeanor to give a DNA sample, and has DNA records deleted automatically within 30 days after dismissal, acquittal, no charge within a year of arrest, or…

    Voted no · most Republicans voted yes · Democrats 9–21, Republicans 55–9

    Mar 10, 2026Official record ↗

  • Relating to school funding by establishing the state percent of growth and the categorical state percent of growth for the budget year beginning July 1, 2025, modifying provisions relating to the property tax replacement payments, modifying provisions relating to the regular program state cost per pupil and funding for shared operational functions, and including effective date provisions

    What it does: Sets 2% growth in state per-pupil school aid and categorical funding for the 2025-26 school year, adds $5 to per-pupil cost that year, changes property tax replacement payments to districts, and raises the cap on shar…

    Voted no · most Republicans voted yes · Democrats 0–30, Republicans 60–6

    Apr 8, 2025Official record ↗

How this is counted

Their votes on the most contested roll calls

The votes in their chamber that came out closest and most divided by party, among those they voted on. How we rank

See all their split votes

Substantive votes concern legislation or nominations; procedural votes concern how the chamber considers them. A Yes vote applies to the motion shown, which may not be final passage.

HF 2801 · IA HOUSE

Modifying the major economic growth attraction program, and including effective date provisions

Not votingNO VOTE

Motion: Shall the bill pass?

Lets the state award one business a tax credit of up to 10% of its investment, paid over ten years, for a major project in a county of 50,000 people or fewer, instead of up to 5% credits for two businesses; credits are refundable and transferable.

AI summary — read the bill text ↗
Passed 75–17·Substantive·Oct 2, 2026Roll call ↗
SF 2472 · IA HOUSE

Relating to state and local government taxes, fees, financial authority, and budgets, by modifying property assessment provisions, divisions of revenue, and funding from the secure an advanced vision for education fund, establishing a program for first-time homebuyers, modifying and making appropriations, and including effective date, applicability, and retroactive applicability provisions

Not votingNO VOTE

Motion: Shall the bill pass?

On the version voted May 3, 2026: Replaces most homeowners' homestead property tax credit with an exemption of 10% of taxable value, from $5,500 to $20,000, starting in 2026, limits county and city general levies and other rate-limited levies to 2% yearly growth, and creates FirstHome Iowa savings accounts.

AI summary — read the bill text ↗
Passed 62–22·Substantive·May 2, 2026Roll call ↗
HF 2800 · IA HOUSE

Relating to state and local government and finances, including by making, modifying, limiting, or reducing appropriations, distributions, or transfers, authorizing expenditure of unappropriated moneys in special funds, making corrections, and providing for properly related matters including the national electrical code, local civil rights laws, political party state central committees, noxious weeds, nonresident deer hunting licenses, proprietary treatment systems, poultry associations, tax c...

Not votingNO VOTE

Motion: Shall the bill pass?

On the version voted May 3, 2026: Makes wide-ranging changes to state law and budgets, including corrections to 2026 acts, limits on standing appropriations, an insurer tax credit for health care access, a civil litigation abuse lawsuit, required American history and government courses at state universities, and judicial salary changes.

AI summary — read the bill text ↗
Passed 58–26·Substantive·May 2, 2026Roll call ↗
HF 2800 · IA HOUSE

Relating to state government and finances, including by making corrections, and including effective date and retroactive applicability provisions

Not votingNO VOTE

Motion: Shall amendment H–8494, to amendment H–8491, be adopted?

Amends the bill to remove its division that changes the 2023 National Electrical Code for Iowa homes (such as dropping arc-fault interrupter requirements) and bars local electrical codes stricter than the national code. (AI-written)

On the version voted May 3, 2026: Makes wide-ranging changes to state law and budgets, including corrections to 2026 acts, limits on standing appropriations, an insurer tax credit for health care access, a civil litigation abuse lawsuit, required American history and government courses at state universities, and judicial salary changes.

AI summary — read the bill text ↗
Failed 28–56·Substantive·May 2, 2026Roll call ↗
SJR 11 · IA HOUSE

Proposing an amendment to the Constitution of the State of Iowa relating to requirements for certain state tax law changes

Not votingNO VOTE

Motion: Shall amendment H–8490 be adopted?

On the version voted Apr 15, 2025: Proposes a state constitutional amendment requiring a two-thirds vote of each legislative chamber to raise income tax rates or create a new state income-based tax; it goes to voters in November 2026.

AI summary — read the bill text ↗
Failed 21–57·Substantive·May 2, 2026Roll call ↗
SJR 11 · IA HOUSE

Proposing an amendment to the Constitution of the State of Iowa relating to requirements for certain state tax law changes

Not votingNO VOTE

Motion: Shall the rules be suspended to consider amendment H–8488?

On the version voted Apr 15, 2025: Proposes a state constitutional amendment requiring a two-thirds vote of each legislative chamber to raise income tax rates or create a new state income-based tax; it goes to voters in November 2026.

AI summary — read the bill text ↗
Failed 21–57·Procedural·May 2, 2026Roll call ↗
SJR 11 · IA HOUSE

Proposing an amendment to the Constitution of the State of Iowa relating to requirements for certain state tax law changes

Not votingNO VOTE

Motion: Shall amendment H–8487 be adopted?

On the version voted Apr 15, 2025: Proposes a state constitutional amendment requiring a two-thirds vote of each legislative chamber to raise income tax rates or create a new state income-based tax; it goes to voters in November 2026.

AI summary — read the bill text ↗
Failed 21–57·Substantive·May 2, 2026Roll call ↗
SJR 11 · IA HOUSE

Proposing an amendment to the Constitution of the State of Iowa relating to requirements for certain state tax law changes

Not votingNO VOTE

Motion: Shall the rules be suspended to consider amendment H–8486?

On the version voted Apr 15, 2025: Proposes a state constitutional amendment requiring a two-thirds vote of each legislative chamber to raise income tax rates or create a new state income-based tax; it goes to voters in November 2026.

AI summary — read the bill text ↗
Failed 22–56·Procedural·May 2, 2026Roll call ↗
SJR 11 · IA HOUSE

Proposing an amendment to the Constitution of the State of Iowa relating to requirements for certain state tax law changes

Not votingNO VOTE

Motion: Shall the rules be suspended to consider amendment H–8485?

On the version voted Apr 15, 2025: Proposes a state constitutional amendment requiring a two-thirds vote of each legislative chamber to raise income tax rates or create a new state income-based tax; it goes to voters in November 2026.

AI summary — read the bill text ↗
Failed 21–57·Procedural·May 2, 2026Roll call ↗
SJR 11 · IA HOUSE

Proposing an amendment to the Constitution of the State of Iowa relating to requirements for certain state tax law changes

Not votingNO VOTE

Motion: Shall the rules be suspended to consider amendment H–8484?

On the version voted Apr 15, 2025: Proposes a state constitutional amendment requiring a two-thirds vote of each legislative chamber to raise income tax rates or create a new state income-based tax; it goes to voters in November 2026.

AI summary — read the bill text ↗
Failed 21–57·Procedural·May 2, 2026Roll call ↗

Showing 10 of 531 votes in this collection. Coverage may be incomplete; each entry links to the official record.