Oklahoma estimated tax (quarterly) calculator

Plan quarterly payments based on Oklahoma tax rules.

How this calculator works

Step 1 estimates your Oklahoma tax based on the taxable income you provide and the bracket schedule (0.25% up to 4.75%). The tool adjusts for Oklahoma-only income using your allocation %.

Step 2 uses your withholding and prior-year tax (if provided) to estimate a quarterly plan that aligns with Oklahoma's 90% current-year or 100% prior-year safe-harbor rules.

Step 3 divides the remaining tax into four equal payments and lists the standard due dates used by Oklahoma.

Frequently asked questions

When are Oklahoma estimated payments due?

Oklahoma uses the standard quarterly dates: April 15, June 15, September 15, and January 15 of the following year.

What if withholding changes later?

Recalculate with updated withholding to keep your quarterly plan accurate.

Is the safe harbor the same as federal?

Oklahoma generally follows a 90% current-year or 100% prior-year safe harbor. Special rules apply if at least two-thirds of your income is from farming or ranching.

Estimates use Oklahoma's published brackets and are not a substitute for official payment calculations.