Oklahoma Quarterly Tax Calculator
Calculate your estimated quarterly tax payments for federal and Oklahoma state taxes. Designed for self-employed individuals, freelancers, and independent contractors.
OK State Tax: Progressive 0.3% - 4.8%
Quarterly Payment Amount
$6,429
Per quarter (4 remaining)
Annual Tax Breakdown
2026 Payment Schedule
Jan 1 - Mar 31
Due: April 15, 2026
$6,429
Apr 1 - May 31
Due: June 15, 2026
$6,429
Jun 1 - Aug 31
Due: September 15, 2026
$6,429
Sep 1 - Dec 31
Due: January 15, 2027
$6,429
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.
Oklahoma Quarterly Tax Highlights
Oklahoma has 6 tax brackets with rates from 0.25% to 4.75%
Top rate applies at relatively low income level
Oklahoma Quarterly Tax FAQ
What is Oklahoma's income tax rate?
Oklahoma has a progressive income tax with 6 brackets from 0.25% to 4.75%. The top rate of 4.75% applies to income over $7,200 (single).
Oklahoma Estimated Quarterly Tax Payments for Self-Employed Workers in 2026
Self-employed workers in Oklahoma must pay both federal estimated taxes to the IRS and state estimated taxes to the Oklahoma Tax Commission. Oklahoma has a progressive income tax with 6 brackets and rates ranging from 0.25% to 4.75%. If you expect to owe $1,000 or more in Oklahoma state income tax after withholding and credits, you must make quarterly estimated payments using Form OW-8-ES.
Oklahoma's top rate of 4.75% kicks in at just $7,200 of taxable income (single), meaning most self-employed individuals with meaningful income will pay the top rate. The state offers a standard deduction of $6,350 for single filers.
| Tax Layer | Rate / Range | Filed With | Form |
|---|---|---|---|
| Federal income tax | 10% – 37% | IRS | 1040-ES |
| Self-employment tax | 15.3% | IRS | 1040-ES / SE |
| Oklahoma state income tax | 0.25% to 4.75% | Oklahoma Tax Commission | Form OW-8-ES |
How Oklahoma Income Tax Affects Your Quarterly Payments
Oklahoma taxes personal income — including self-employment income — across 6 progressive brackets. The brackets below apply to single filers for tax year 2026. Married filing jointly thresholds are typically higher.
| Bracket | Taxable Income (Single) | Marginal Rate |
|---|---|---|
| 1 | $0 – $1,000 | 0.25% |
| 2 | $1,000 – $2,500 | 0.75% |
| 3 | $2,500 – $3,750 | 1.75% |
| 4 | $3,750 – $4,900 | 2.75% |
| 5 | $4,900 – $7,200 | 3.75% |
| 6 | $7,200+ | 4.75% |
To estimate your Oklahoma quarterly payment, calculate your projected state tax liability using the brackets above, then divide by four. Oklahoma payments are made to the Oklahoma Tax Commission through their online portal at oklahoma.gov/tax or by mail using Form OW-8-ES.
Federal Self-Employment Tax and Quarterly Due Dates
All self-employed workers must pay federal self-employment (SE) tax of 15.3% on 92.35% of net earnings. This consists of 12.4% for Social Security (on earnings up to $184,500 in 2026) and 2.9% for Medicare (no cap). An additional 0.9% Medicare surtax applies to earnings above $200,000 (single filers).
Both Oklahoma and federal estimated tax payments follow the same quarterly schedule:
| Quarter | Income Period | Due Date |
|---|---|---|
| Q1 | January 1 – March 31 | April 15, 2026 |
| Q2 | April 1 – May 31 | June 15, 2026 |
| Q3 | June 1 – August 31 | September 15, 2026 |
| Q4 | September 1 – December 31 | January 15, 2027 |
To avoid underpayment penalties, pay at least 100% of your prior-year tax liability (or 110% if your AGI exceeds $150,000) spread across four equal payments, or at least 90% of your current-year tax. You can deduct 50% of your self-employment tax from your adjusted gross income, reducing both your federal and Oklahoma taxable income.
Related Calculators
Official References
This calculator uses current federal and Oklahoma tax rates and schedules:
- IRS Estimated Tax Guidelines
Federal quarterly tax requirements and Form 1040-ES
- Oklahoma Tax Commission
Official Oklahoma 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.