Oklahoma Quarterly Estimated Tax Calculator
Oklahoma has a graduated state income tax with a top rate of 4.50%, which factors into your quarterly IRS estimated payments alongside federal self-employment and income tax. Federal due dates apply the same way in every state.
Estimated quarterly payments
Based on the IRS safe-harbor rule of paying 90% of this year's estimated tax in four equal installments.
| Period | Due date | Amount |
|---|---|---|
| Q1 (Jan 1 – Mar 31) | April 15 | $3,981 |
| Q2 (Apr 1 – May 31) | June 15 | $3,981 |
| Q3 (Jun 1 – Aug 31) | September 15 | $3,981 |
| Q4 (Sep 1 – Dec 31) | January 15 (next year) | $3,981 |
Total estimated payments $15,923
Full estimated annual tax (SE tax + federal + state income tax): $17,692