Annual filing deadlines

Tax position	General deadline	Main filing point
Company subject to 15%	Within four months after year or accounting-period end	Annual return with accounts; audited accounts are required under the normal company filing rule
Qualifying establishment subject to 3%	Within three months after tax-year end	Gross income, expenses and required small-enterprise information
Inactive or non-trading CR	The applicable annual deadline still applies	Zero revenue and expense fields plus evidence of non-activity as required

For a normal company with a 31 December year end, the usual four-month deadline is 30 April of the following year. The correct date depends on the company’s registered accounting period. Information on this page was reviewed on 16 September 2026.

Who must file an income-tax return?

Income-tax filing follows the taxpayer and its registered tax period. The Oman Tax Authority states that all holders of a Commercial Registration must register for income tax. The annual return reports the company’s income, expenses, taxable result and tax due. Filing can still be required when the business made a loss, had no employees, did not trade, or claims an exemption.

An inactive CR is not the same as a formally closed company. The Tax Authority FAQ says a taxpayer that did not practise the activity and had no workers during the year should enter zero revenue and expenses and attach a signed and stamped non-activity letter. Formal closure requires the relevant liquidation and tax-file procedures.

What the filing process includes

1. Confirm the filing period and current status

Start with the CR, Tax Identification Number, Tax Card, registered accounting period, previous return and portal record. This identifies the year to be filed, the applicable deadline, earlier gaps and any Tax Authority notices.

2. Close the accounting records

The accounts should reconcile revenue, expenses, bank movements, owner or shareholder transactions, payroll, assets, liabilities and year-end balances. Missing invoices, unexplained transfers and incomplete ledgers should be addressed before the return is treated as ready.

3. Prepare the tax computation

Accounting profit is not automatically the final taxable income. The filing work may require adjustments for non-deductible expenses, exempt income, depreciation or capital allowances, losses, related-party items and other tax treatments supported by the company’s records.

4. Complete accounts and professional review

The Tax Authority states that taxpayers subject to the standard 15% rate submit the return with audited accounts. Where licensed audit, accounting or tax-specialist work is required, it should be completed by the appropriate Oman professional. Oman Verified can coordinate that work within an agreed engagement.

5. Submit, pay and retain evidence

The return is submitted electronically through the Tax Authority portal. Tax shown as due is normally payable by the return deadline. Save the submitted return, payment evidence, accounts, computation, supporting schedules and any Authority correspondence with the company’s permanent tax records.

Documents usually needed

Late, incomplete and inactive-company returns

A missed return should be treated as a file problem, not only a form-filling task. First identify every missing period, the available accounts, unpaid tax, assessments, penalties, Tax Card status and whether VAT or withholding-tax issues also exist. The Tax Authority FAQ states that late payment can attract additional tax at 1% per month on unpaid tax, and failure to file an income-tax return can lead to a penalty from OMR 100 to OMR 2,000.

Submitting one current return does not necessarily resolve earlier years. A cleanup plan should put the periods in order, rebuild the evidence available for each year and distinguish company income tax from VAT, withholding tax and company-liquidation requirements.

How Oman Verified can help

We begin by checking the actual tax file and the accounting records available. Depending on the case, the agreed work can include a filing-status review, missing-document list, coordination of bookkeeping or audited accounts, return-preparation support, portal submission follow-up, payment confirmation and a compliance calendar for the next period. The engagement identifies which work Oman Verified coordinates and which work must be completed by a licensed auditor or specialist.

Corporate tax return questions

Does a company with no profit still file?

Yes. A loss or zero profit does not by itself remove the annual filing obligation.

Does an inactive company file a zero return?

The Tax Authority says a non-trading taxpayer should complete revenue and expense fields with zero and attach a signed and stamped non-activity letter. The facts and portal record should still be reviewed.

Are audited accounts required?

The Tax Authority FAQ states that taxpayers subject to 15% submit the return with audited accounts. The required scope depends on the entity and filing position.

Is the deadline six months after year end?

The general current rule for a taxpayer subject to 15% is four months after the end of the tax year or accounting period. The 3% regime generally has a three-month deadline.

Can Oman Verified quote the work before seeing the records?

An initial range may be possible, but a reliable scope depends on the number of years, record quality, audit needs, portal status and unresolved assessments or balances.

Related guidance and official sources

• Oman tax rates, deadlines and company obligations
• Oman tax services for companies
• Oman Tax Card renewal support
• Company liquidation and tax-file closure
• Oman Tax Authority Income Tax FAQs
• Oman Tax Authority return overview

Oman Verified coordinates client-side tax preparation and follow-up in Oman; official tax services and decisions are completed through the Oman Tax Authority. Filing advice and scope depend on the company’s records, accounts, tax period and current portal status.