Oklahoma payroll withholding basics for small employers

If you pay yourself or a few employees in Oklahoma, you have state payroll duties on top of federal ones. You withhold state income tax from wages, send it to the Oklahoma Tax Commission (OTC), and file returns on a set schedule. You also pay state unemployment tax to the Oklahoma Employment Security Commission (OESC). This guide covers the basics so you know what to set up and when things are due.

Register with two state agencies

Before your first Oklahoma payroll, you need two separate accounts.

Oklahoma Tax Commission (withholding). Register for a withholding account through OkTAP at oktap.tax.ok.gov. You will use OkTAP to file withholding returns, make payments and submit year-end forms.

Oklahoma Employment Security Commission (unemployment). Register for state unemployment through the OESC employer portal. This account covers your unemployment contributions and quarterly wage reports.

These are two agencies with two logins and two sets of deadlines. Keep both account numbers somewhere safe. You will need them on returns and payments.

Get Form OK-W-4 from each employee

Each employee should fill out Form OK-W-4, the Oklahoma version of the federal W-4. On it, the employee claims allowances, and those allowances lower the amount you withhold.

Oklahoma uses its own form. A federal W-4 does not replace it. If an employee has not given you an OK-W-4, withhold as if they are single with zero allowances. That is the default, and it usually means more tax is withheld.

Keep each OK-W-4 with your payroll records. When an employee hands you a new one, use it starting with the next payroll.

How Oklahoma withholding is figured

The OTC publishes withholding tables in Packet OW-2. Most small employers use the percentage method from that packet. The basic steps are:

1. Start with the employee's taxable wages for the pay period.
2. Subtract the value of their allowances. Each allowance is worth $1,000 a year, so you divide that by the number of pay periods in a year.
3. Apply the rates in Packet OW-2 for the employee's filing status.
4. Round the result to whole dollars.

Check that you are using the current year's Packet OW-2. Rates and brackets can change, so do not reuse last year's numbers without checking.

How often to send withholding

How often you pay depends on how much you withhold.

• Quarterly. If your withholding is $500 or less per quarter, you may remit quarterly.
• Monthly. If you withhold more than that, remit monthly. Payment is due by the 20th of the following month.
• Semiweekly. If you averaged $10,000 or more a month in the prior fiscal year, you remit on a semiweekly schedule like the federal one.

Most small employers with a few people on payroll will be quarterly or monthly. If your payroll grows, check your status each year.

File the quarterly return: Form WTH-10001

Whatever your payment schedule, you file the quarterly withholding return, Form WTH-10001. It reports the wages you paid and the Oklahoma tax you withheld for the quarter. It is due the 20th of the month after each quarter ends.

Before you file, compare the return with your payroll records and the payments you made. If the numbers do not match, find out why before you submit.

Year-end: W-2s and the annual reconciliation

After the year ends, you file W-2s and the annual reconciliation with the OTC. Both are filed electronically on OkTAP by January 31.

The state totals on your W-2s should match what you reported on your four quarterly returns. Small errors during the year show up here, so it helps to reconcile each quarter as you go.

State unemployment through OESC

State unemployment tax is paid by you, the employer. It is not withheld from employee pay.

• Rate. New employers generally start at a 1.5% contribution rate. OESC will tell you your assigned rate.
• Wage base. For 2026, the taxable wage base is $25,000 per employee. Once an employee's wages for the year pass that amount, you stop paying unemployment tax on their wages for the rest of the year.
• Reporting. File the quarterly contribution report, Form OES-3, and pay what you owe by the last day of the month after each quarter.

The OES-3 asks for wages by employee, so keep good per-person records.

Report new hires

Employers must report new hires to the state. Check Oklahoma's new-hire reporting rules for what to report and how soon. Make it part of your hiring checklist so it does not slip.

Deadline table

If a due date falls on a weekend or holiday, it moves to the next business day.

A simple routine

A short checklist keeps most small employers on track.

• Each payroll. Use current OK-W-4s and the current Packet OW-2. Record withholding per employee.
• Each month or quarter. Pay your withholding on time based on your schedule.
• Each quarter. File Form WTH-10001 and Form OES-3. Watch each employee's year-to-date wages against the $25,000 wage base.
• Each January. File W-2s and the annual reconciliation on OkTAP by January 31.
• Each new hire. Collect an OK-W-4 and report the hire to the state.

Put these dates on a calendar with reminders a few days early. Late payments and late returns can bring penalties and interest.

Where Selfroll fits

Selfroll is a free do-it-yourself calculator that figures Oklahoma withholding and state unemployment along with your federal payroll taxes, keeps a deadline calendar you can export, and fills a draft Form WTH-10001 for you to review. You still make the payments and file the returns yourself in OkTAP and the OESC portal, and your data stays encrypted in your own browser.

This guide is general information, not tax or legal advice. Check current Oklahoma Tax Commission and OESC rules or ask a CPA.