C Corporation Resource Center

Stay current on C corporation taxation with the latest advocacy efforts, guidance and tools available in this reference library.

Featured resources

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2024 C Corporation Income Tax Return Checklist – Form 1120 (Long)
Dec 17, 2024
1.1 MB
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Federal Tax Return Due Dates Chart
Jan 17, 2025
155.6 KB
The United States Capitol building
OECD BEPS 2.0 — Pillar One and Pillar Two
Apr 30, 2025
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Featured resources

View more resources
2024 C Corporation Income Tax Return Checklist – Form 1120 (Long)
Dec 17, 2024
1.1 MB
Abstract dark blue image
Federal Tax Return Due Dates Chart
Jan 17, 2025
155.6 KB
The United States Capitol building
OECD BEPS 2.0 — Pillar One and Pillar Two
Apr 30, 2025
View more resources

    Featured news and articles

    Tax written out with magnifying glass and money
    AICPA Provides Comments on Two Proposed Regulations Aimed at Corporate Reorganizations and Separations
    Jul 28, 2025

    Featured news and articles

    Tax written out with magnifying glass and money
    AICPA Provides Comments on Two Proposed Regulations Aimed at Corporate Reorganizations and Separations
    Jul 28, 2025

      AICPA Tax Policy & Advocacy

      View the Tax Policy & Advocacy Team’s full efforts as they monitor and advocate on behalf of our members and the public on emerging legislative, regulatory and administrative matters in the tax environment.

      AICPA Tax Policy & Advocacy

      View the Tax Policy & Advocacy Team’s full efforts as they monitor and advocate on behalf of our members and the public on emerging legislative, regulatory and administrative matters in the tax environment.

      Guidance and insights

      Browse the topic areas to explore tools and support specifically designed for C corporations.

      Annual Tax Compliance Kit (ATCK) tools

      Reporting Services Engagement Letter

      2024 Amended Return Engagement Letter

      2024 Audit Representation Engagement Letter

      2024 C Corporation Engagement Letter – Form 1120

      2024 Corporation Income Tax Return Organizer – Forms 1120 and 1120-S

      2024 C Corporation Income Tax Return Checklist – Form 1120 (Long)

      2024 C Corporation Income Tax Return Checklist – Form 1120 (Short)

      2024 C Corporation Income Tax Return Checklist – Form 1120 (Mini)

      2024 State Tax Nexus Guide

      2024 State Tax Nexus Checklist

      Guidance and resources

      Beneficial ownership information (BOI) reporting

      Employee Retention Credit Guidance and Resources

      Federal Taxpayer Penalties Guide

      Federal Tax Return Due Dates Chart

      IRS Business Examination Checklist

      Initial Business Return Filing Checklist

      OECD BEPS 2.0 — Pillar One and Pillar Two

      Planning after tax changes

      State and Local Tax Roadmap and Resource Center

      IRS resources

      About Form 1120, U.S. Corporation Income Tax Return

      Large Business and International (LB&I) Division

      Tax information for corporations

      Podcasts

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      Podcasts

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        CPE learning

        CPE Self-study
        Taxation of Corporations - Tax Staff Essentials
        Online
        Level: Intermediate
        $150 - $225

        CPE learning

        CPE Self-study
        Taxation of Corporations - Tax Staff Essentials
        Online
        Level: Intermediate
        $150 - $225
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