Iowa Tax Deadline 2025. Since the enactment of iowa senate file 2442 in may, 2024, iowa law provides for a flat tax rate of 3.8 percent for all levels of taxable individual income beginning with tax year 2025. And if you need help.

Every employer who maintains an office or transacts business in iowa and who is required to withhold federal income tax on any compensation paid to employees for services. Filing frequencies and return due dates for iowa sales and use tax and withholding income tax.