1099 Quarterly Taxes in Iowa (2026)
If you're self-employed in Iowa — freelancer, contractor, gig worker, or single-member LLC — you owe quarterly estimated taxes to two agencies: the IRS (federal) and Iowa Department of Revenue (state). Iowa uses a flat 3.80% income tax, which makes estimating your state burden simpler than progressive states. But you still need to send the money on time to avoid underpayment penalties.
Iowa state income tax (2026)
Iowa uses a flat income tax rate of 3.80% on all taxable income above the standard deduction. There are no brackets — every dollar of taxable income is taxed at the same rate.
How to pay Iowa estimated taxes
Iowa estimated tax due dates do not piggyback federal: Apr 30 / Jun 30 / Sep 30 / Jan 31 (vs federal Apr 15 / Jun 15 / Sep 15 / Jan 15). Confirm via IA 1040ES instructions before paying. Pay Iowa taxes through the Iowa Department of Revenue's online portal: tax.iowa.gov. You can also mail Form IA 1040ES with a check.
Iowa-specific quirk freelancers miss
Iowa transitioned to a flat 3.8% tax in 2026 (the 2025 schedule still had progressive brackets topping at 5.7%; down from 6.0% in 2022). The state also eliminated the alternative minimum tax. This makes Iowa one of the cleanest filing experiences.
Common deductions for Iowa freelancers
- Iowa allows the same business expenses (home office, mileage, software, etc.) as federal.
- Half of SE tax is deductible federally; check Iowa's rules for state conformity.
- IA conforms to federal QBI deduction.
- SEP-IRA / Solo 401(k) contributions reduce both federal and Iowa taxable income.
- Self-employed health insurance premiums are deductible federally.