Quarterly Estimated Tax Calculator — Iowa (2026)
If you earn income in Iowa without withholding — freelancing, contracting, rentals, dividends — the IRS expects payment four times a year, not once. This calculator turns your expected 2026 net profit into a per-quarter number covering self-employment tax, federal income tax and Iowa state tax. Iowa uses a flat personal income tax of 3.80% applied to taxable income after a state standard deduction of $2,210.
Iowa Quarterly Tax Calculator
Gross 1099 income minus business expenses.
2026 due dates and safe harbor
Federal estimated payments are due April 15, June 15, September 15 of 2026 and January 15 of 2027. You avoid penalties by paying either 90% of the current year's liability or 100% of last year's (110% if prior-year AGI exceeded $150,000) — the safe-harbor rule.
Iowa runs its own estimated-payment schedule that usually mirrors the federal dates. On $90,000 of net profit the Iowa portion alone is about $774 per quarter.
Underpayment penalties
The IRS charges interest-style penalties per quarter you fall short, currently around 7–8% annualized. Paying late in the year does not fix an early-quarter shortfall unless you use the annualized income method on Form 2210.
Irregular income is common in insurance work around Des Moines: if Q1 is slow and Q4 is huge, the annualized method usually beats four equal payments.
Paying as a Iowa taxpayer
Pay federally through IRS Direct Pay or EFTPS, and Iowa through the state revenue department's online portal — keep confirmation numbers for both.
Iowa has no separate city or county income tax, so the state figure above is the full sub-federal income tax you pay.
Local and payroll taxes Iowa adds on top
Iowa adds no state-mandated employee payroll deduction beyond FICA, so nothing extra is taken from your gross pay at the state level.
Iowa has no separate city or county income tax, so the state figure above is the full sub-federal income tax you pay.
Nobody withholds these for you when you are self-employed in Iowa. Local wage taxes, city business licences and gross-receipts style levies are yours to register for and remit alongside your quarterly federal and state estimates.
Working across a state line from Iowa
Iowa holds income-tax reciprocity agreements with Illinois. If you commute between them, your wages are taxed only by your state of residence — file the exemption certificate with your employer so the wrong state is not withheld from every paycheck.
Remote and hybrid work complicates this further: most states tax income where the work is physically performed, so a Des Moines resident spending part of the year at a client site in Illinois may owe a nonresident return there. Keep a day-count log if you split time between states.
The rest of your Iowa tax bill
Iowa charges a 6% state sales tax, homeowners pay an average effective property tax of 1.5% of market value, and the minimum wage in force during 2026 is $7.25 an hour.
Local option sales tax of 1% applies in most jurisdictions.
Income tax is only one part of a state's take. Iowa recovers revenue through sales and property tax as well, which is why headline income tax rates alone are a poor guide to how far a salary really goes. Iowa fully exempts retirement income for filers 55 and older, including pensions and IRA distributions.
Iowa vs Illinois on the same salary
On a $90,000 salary, a single filer keeps about $68,809 a year in Iowa against roughly $67,690 in Illinois — a difference of $1,119, or $93 a month.
Effective combined rates are 23.5% in Iowa and 24.8% in Illinois. Set that gap against living costs: index 90 here versus 93 there, with property tax at 1.5% and 2.07% respectively.
Iowa income tax brackets 2026 (single filer)
| Taxable income | Rate |
|---|---|
| $0 and up | 3.80% |