Iowa: corporate income tax, franchise tax unconfirmed and an annual report required.
Each fact below cites the agency page we read and the day we read it. Where a rule is still being confirmed, the page says so instead of showing a zero.
Verified facts
Corporate income tax
Yes
Corporation income tax, Form IA 1120; for tax years beginning on or after January 1, 2024: 5.5% on the first $100,000 of taxable income and 7.1% above $100,000.
Franchise or privilege
Not verified
Franchise tax applies to financial institutions only (state banks, national banking associations, trust companies, savings and loan associations, production credit associations), reported on Form IA 1120F; general operating corporations file the income tax return.
Not verifiedEntity annual report
Yes
Biennial report for profit corporations: every even-numbered year, filed between January 1 and April 1; $60 fee. LLCs, LLPs and nonprofits file in odd-numbered years.
Return due date
Published rule
Calendar-year filers: no later than April 30 (April 30, 2026 for tax year 2025). Fiscal-year filers: last day of the fourth month after the fiscal year end; short-period returns 45 days after the original federal due date. Payment due the same date; interest accrues after it.
Extension
Not verified
Automatic 6-month extension, available only if 90% or more of the correct tax was paid by the original due date. It does NOT change the payment date: "The automatic extension does not change the due date of the return; it only extends the time to file the…
Not verifiedZero activity / minimum tax
Not verified
Not verified
Long-form guide in professional review
Dates, extensions and payments
Filing and payment dates stay separate wherever the source supports it.
- Filing
Return filing
Calendar-year filers: no later than April 30 (April 30, 2026 for tax year 2025). Fiscal-year filers: last day of the fourth month after the fiscal year end; short-period returns 45 days after the original federal due date. Payment due the same date; interest accrues after it.
- Entity report
Entity report
Biennial report for profit corporations: every even-numbered year, filed between January 1 and April 1; $60 fee. LLCs, LLPs and nonprofits file in odd-numbered years.
Email me the Iowa guide
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Frequently asked questions
Does Iowa impose a corporate income tax?
Yes. The state agency publishes the applicable rate.
When is the Iowa corporate return due?
Calendar-year filers: no later than April 30 (April 30, 2026 for tax year 2025). Fiscal-year filers: last day of the fourth month after the fiscal year end; short-period returns 45 days after the original federal due date. Payment due the same date; interest accrues after it.
Does an extension also postpone the tax payment?
No. The extension moves the filing date, not the payment date; unpaid tax can accrue penalty and interest.
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