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Iowa · Income Tax

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Iowa Individual Income Tax Return (Form IA 1040) for sole proprietors and single-member LLCs. Covers the flat 3.8% rate (tax year 2025/2026), Iowa net income computation from federal AGI, Iowa standard deduction, and estimated tax. Iowa completed its historic flat-tax reform in 2025. Trigger: taxpayer is an Iowa resident or has Iowa-source income.
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