Iowa has a single flat individual income tax rate of 3.8% on all taxable income, for residents and nonresidents alike (Iowa Code §422.5(1)(a), "a rate of three and eight-tenths percent"). The old graduated rate table in §422.5A was repealed for tax years beginning on or after January 1, 2025. A nonresident pays the 3.8% tax computed on total income, reduced by nonrefundable credits and then multiplied by the share of net income allocated to Iowa (§422.5(1)(b)).
“levied, collected, and paid annually upon and with respect to the entire taxable income as defined in this subchapter at a rate of three and eight-tenths percent”
Read on Nov 13, 2026 from legis.iowa.gov.
Checked once · Nov 13, 2026