Iowa Quarterly Tax Calculator
Calculate your estimated quarterly tax payments for federal and Iowa state taxes. Designed for self-employed individuals, freelancers, and independent contractors.
IA State Tax: Flat 3.8%
Quarterly Payment Amount
$6,299
Per quarter (4 remaining)
Annual Tax Breakdown
2026 Payment Schedule
Jan 1 - Mar 31
Due: April 15, 2026
$6,299
Apr 1 - May 31
Due: June 15, 2026
$6,299
Jun 1 - Aug 31
Due: September 15, 2026
$6,299
Sep 1 - Dec 31
Due: January 15, 2027
$6,299
Don't miss your quarterly payments!
The IRS may charge penalties and interest if you underpay or pay late. Consider setting up automatic payments or calendar reminders.
Iowa Quarterly Tax Highlights
Iowa has a flat 3.8% income tax rate
Recently converted from progressive to flat tax
Use Form IA 1040-ES for quarterly payments
Significant tax reduction from previous rates
Iowa Quarterly Tax FAQ
What is Iowa's income tax rate?
Iowa has a flat 3.8% income tax rate as of 2026. The state recently completed a transition from a progressive system with rates up to 8.53% to this single flat rate.
Official References
This calculator uses current federal and Iowa tax rates and schedules:
- IRS Estimated Tax Guidelines
Federal quarterly tax requirements and Form 1040-ES
- Iowa Department of Revenue
Official Iowa tax authority
- IRS Self-Employment Tax
Social Security and Medicare tax information
This calculator provides estimates based on 2026 tax rates. Your actual tax liability may vary based on deductions, credits, and other factors. Consult a tax professional for personalized advice.