Taxes in Sioux City
Sioux City's tax picture combines Iowa's real, current flat 3.8% (2026) income tax -- cited as the lowest flat rate among Midwest income-tax states -- with a genuinely counterintuitive, comparatively HIGH local effective property tax rate, Iowa's real 2023 retirement-income exemption for residents 55+, and a real, current 7.0% combined sales tax.
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Learn moreIowa's Real, Flat 3.8% Income Tax (2026)
Iowa's 2026 individual income tax runs a flat 3.8% rate, applying uniformly to a Sioux City resident's Iowa-source taxable income regardless of income level. This flat rate is the product of Senate File 2442 (2024), which accelerated an earlier, more gradual multi-year phase-down toward this same flat rate -- one cited source describes it as the lowest flat rate among Midwest states that levy an income tax at all.
Property Tax Runs a Real, Counterintuitively High Rate -- See the Dedicated Property-Taxes Page
As detailed in full on the property-taxes topic page, Sioux City's cited median effective property tax rate runs approximately 1.58% -- genuinely high relative to both the national median and this project's own verified Iowa statewide range -- layered on top of Iowa's real, complex statewide 'rollback' assessment-limitation mechanism.
Iowa's Real 2023 Retirement-Income Exemption and Longstanding Social Security Exemption
As detailed in full on the retiring topic page, Iowa's real House File 2317 (2022), effective for tax years beginning January 1, 2023, excludes retirement income (401(k)/IRA distributions, pensions including IPERS/FERS, many annuity payments, Roth conversions) from Iowa taxable income for residents 55 or older -- on top of Iowa's separate, longstanding full exemption of Social Security benefits for residents of ANY age.
A Real, Current 7.0% Combined Sales Tax
Iowa's flat statewide sales tax runs 6.0%, and Sioux City levies its own additional 1.0% Local Option Sales Tax (LOST), for a real, current combined rate of 7.0% as of an April 2026 update.
Confirm Current, Address-Specific Figures Directly
Given the real, genuine complexity of Iowa's rollback-based property tax system and the real, disclosed cross-source spread on Sioux City's own effective rate, confirm current, address-specific property tax figures directly with the Woodbury County Assessor before finalizing a household budget.
Key takeaways
- Iowa's 2026 flat 3.8% income tax applies uniformly to Sioux City residents' Iowa-source income -- cited as the lowest flat rate among Midwest income-tax states.
- Sioux City's own cited median effective property tax rate (~1.58%) runs genuinely above both the national median and Iowa's own statewide range.
- Iowa's real 2023 law fully excludes retirement income (pensions, 401(k)/IRA) from state tax for residents 55+, on top of a longstanding full Social Security exemption.
- Combined sales tax runs a real, current 7.0% -- Iowa's flat 6.0% state rate plus Sioux City's own 1.0% local-option add-on.
- Confirm current, address-specific property tax figures directly with the Woodbury County Assessor given Iowa's genuinely complex rollback system.
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