Iowa Estimated Tax Payments - Official Portal

Iowa Estimated Quarterly Tax

Iowa requires estimated quarterly tax payments if you expect to owe more than $1,000 in state tax. The safe harbor is paying 90% of your current year tax liability or 100% of your prior year tax. Payments are due on 2026-04-30, 2026-06-30, 2026-09-30, and 2027-01-31.