Oman has operated a 15% flat corporate income tax rate since the landmark Income Tax Law reform under Royal Decree No. 28/2009 (PwC, "Oman – Corporate – Taxes on corporate income," Worldwide Tax Summaries, December 2025). That longevity puts Oman considerably further along the corporate tax maturity curve than newer GCC regimes.
Today, Oman's tax framework is moving faster than it has in years. Since VAT launched in April 2021, the Oman Tax Authority has been expanding its compliance infrastructure, tightening transfer pricing oversight, and building toward mandatory e-invoicing under the Fawtara programme starting August 2026. Corporate tax sits at the centre of all of it.
Whether you're setting up a new business, restructuring an existing one, or managing cross-border payments to non-resident service providers, this guide covers what you need to know: CIT rates and thresholds, the withholding tax regime, deductible expenses, filing deadlines, and how Oman's rates compare across the GCC. If you also need the VAT picture, see our Oman VAT complete compliance guide.
Key Takeaways- Oman's standard corporate income tax rate is 15%; a preferential 3% rate applies to qualifying proprietorships and LLCs with gross income of OMR 150,000 or less (PwC, December 2025)- A January 2023 Royal Directive suspended WHT on dividends and interest paid to non-resident investors; 10% WHT still applies to royalties, management fees, and service fees- The annual corporate tax return is due by 30 April of the following year; late filing attracts a penalty of OMR 100–2,000 plus 1% monthly interest on unpaid tax (PwC, December 2025)- Tax losses can be carried forward for up to five years; there is no loss carry-back provision
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What Is Oman's Corporate Income Tax?
Since 2009, Oman's corporate income tax has been governed by the Income Tax Law under Royal Decree No. 28/2009, as amended by subsequent Royal Decrees including RD No. 9/2017 (PwC, "Oman – Corporate – Taxes on corporate income," Worldwide Tax Summaries, December 2025). The law applies to both resident companies and non-resident companies earning Oman-source income, making it a broader instrument than the VAT regime.
Oman's corporate tax is an income tax, not a transaction tax. It's levied on net taxable income — revenue minus allowable deductions — at a flat 15% rate. There's no tiered rate structure above the threshold, no participation exemption for dividends received from Omani subsidiaries (they're exempt by statute), and no general capital gains tax. The result is a relatively clean framework compared to the multi-rate structures common in Europe or Asia.
What makes Oman distinctive in the GCC is the combination of CIT *and* withholding tax. Most GCC countries have moved toward one or the other, or neither. Oman retains WHT on royalties and service fees to non-residents — which creates compliance obligations not just for the resident business paying tax on its profits, but also for any Omani business making cross-border payments to non-resident service providers and licensors.
Oman's corporate tax predates the GCC's post-2015 fiscal reform wave by decades. That longevity means Oman's OTA is far more experienced in corporate audit and transfer pricing scrutiny than newer regimes like the UAE's FTA, which has only been operating corporate tax since June 2023. Businesses that have dealt with the UAE's FTA should expect more established audit procedures in Oman.
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Who Must Register for Corporate Tax in Oman?
In 2025, all juridical persons carrying on a business or professional activity in Oman are required to register with the OTA and file a corporate tax return, regardless of profitability (PwC, "Oman – Corporate – Taxes on corporate income," Worldwide Tax Summaries, December 2025). The obligation to file exists even if the company makes a loss.
Resident companies: An Omani company — meaning one incorporated under Oman's Commercial Companies Law — is tax-resident in Oman and subject to CIT on its worldwide income. However, income arising outside Oman is generally exempt if it's already been subject to foreign tax, depending on applicable double taxation treaty provisions.
Non-resident companies: A foreign company without a permanent establishment (PE) in Oman isn't subject to CIT directly. But Omani-source royalties, management fees, and service fees are subject to the 10% withholding tax, which the Omani payer must deduct and remit to the OTA. Note that WHT on dividends and interest has been suspended since January 2023.
Permanent establishment: A foreign company that has a PE in Oman — a fixed place of business, a construction project lasting more than a specified period, or a dependent agent — is taxable in Oman on the income attributable to that PE. The definition of PE follows OECD guidance broadly, though Oman's specific treaty network can modify this for residents of treaty countries.
Individual professionals and sole traders: The Income Tax Law also applies to individuals carrying on a commercial, industrial, or professional business in Oman — not just companies. Sole traders and partnerships are taxed on the income from that business at the same 15% rate.
For a step-by-step walkthrough of the registration process, see our Oman corporate tax registration guide.
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What Are Oman's Corporate Tax Rates?
Oman's headline corporate income tax rate is 15%, applying to all taxable persons except those qualifying for the small-business regime (PwC, "Oman – Corporate – Taxes on corporate income," Worldwide Tax Summaries, December 2025). There's no tiered progressive structure — it's a flat 15% on net taxable income.
The small-business preferential rate of 3% applies to Omani proprietorships and limited liability companies (LLCs) that meet all three of the following conditions (PwC, Worldwide Tax Summaries, December 2025):
- Gross income does not exceed OMR 150,000 in the tax year
- Registered capital does not exceed OMR 60,000
- Average employee count during the tax year does not exceed 25
Other entity types — joint-stock companies (SAOG/SAOC), branch offices, and partnerships — are taxed at the standard 15% regardless of size. The 3% regime doesn't apply automatically: the entity must meet all three criteria in the relevant tax year.
One important note on the UAE comparison: UAE's 9% rate only applies to taxable income above AED 375,000 per year. Below that threshold the rate is 0%. Oman's 15% rate is a flat charge with no equivalent zero-rate band — making the UAE's CIT structure more favourable for smaller profit levels, while both converge at their respective headline rates above each threshold.
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How Is Taxable Income Calculated in Oman?
Taxable income is accounting profit adjusted for the specific additions and deductions permitted under the Income Tax Law (PwC, Worldwide Tax Summaries, December 2025). The core principle is that ordinary business expenses incurred wholly and exclusively for the purposes of the business are deductible; expenses of a capital, personal, or non-business nature are not.
Key allowable deductions:
- Salaries and wages (including employer social insurance contributions)
- Rent of business premises
- Finance costs (interest on loans used for business — subject to limits)
- Bad debts (written off in accordance with the OTA's provisions)
- Research and development expenditure
- Depreciation of fixed assets at OTA-prescribed rates
Non-deductible items:
- Penalties and fines imposed by the OTA or any government authority
- Personal expenses
- Dividends paid to shareholders
- Expenses incurred for the benefit of related parties at above-market rates (transfer pricing adjustment)
Depreciation is calculated using the OTA's prescribed rates, which vary by asset class (PwC, "Oman – Corporate – Deductions," Worldwide Tax Summaries, December 2025). Permanent buildings depreciate at 4% per year; standard machinery and equipment at 10–15%; heavy machinery (tractors, cranes) and computer software at 33%. The OTA may reject a depreciation claim if the asset isn't used in the business.
Tax losses can be carried forward to offset future taxable income for a period of up to five years. There's no provision to carry losses back against prior years' income. This means a company that incurs a loss can only benefit from it going forward — making the timing of investment and expenditure decisions commercially important.
Transfer pricing: Since the 2017 amendment to the Income Tax Law, Oman requires related-party transactions to be conducted on an arm's-length basis. The OTA has authority to adjust taxable income where it determines that related-party pricing has been used to shift profit out of Oman. Businesses with related-party transactions should maintain contemporaneous documentation. For more detail, see our Oman transfer pricing guide.
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Oman Withholding Tax: What Businesses Must Know
In 2025, Oman maintained a 10% withholding tax on certain cross-border payments made by Omani resident entities to non-resident companies (PwC, "Oman – Corporate – Withholding taxes," Worldwide Tax Summaries, December 2025). This is the most operationally significant difference between Oman's corporate tax system and the UAE's — the UAE has no withholding tax at all.
Payments subject to WHT at 10%:
- Royalties paid to non-resident licensors
- Research and development payments to non-residents
- Computer software usage rights
- Management fees paid to non-resident group companies
- Technical service fees paid to non-resident service providers
Dividends and interest: suspended since January 2023. A Royal Directive issued by His Majesty Sultan Haitham bin Tarik on Accession Day (11 January 2023) suspended WHT on the distribution of dividends and on interest payments to non-resident investors (PwC, Worldwide Tax Summaries, December 2025). This suspension removed the two most common WHT exposures for foreign investors, making Oman significantly more competitive as an investment destination. The suspension currently has no expiry date, but businesses should monitor for any future reinstatement.
Who's responsible: The Omani payer is legally obligated to deduct WHT at source before remitting the payment. The net amount goes to the non-resident recipient; the 10% must be paid to the OTA. If the payer fails to withhold, the OTA holds the payer liable for the full tax, plus penalties.
Double taxation treaties: Oman has an extensive DTT network covering major trade and investment partners including India, the UK, France, Germany, and the Netherlands (PwC, "Oman – Corporate – Withholding taxes," Worldwide Tax Summaries, December 2025). Treaty provisions can reduce the 10% WHT rate on royalties and service fees — often to 5–10%, and sometimes to 0% for specific payment categories. Always verify the current treaty text and obtain a valid tax residency certificate from the non-resident recipient before applying a reduced rate.
The most common withholding tax mistake we see in Oman is failing to apply the correct treaty rate at the point of payment, then claiming a refund later. The OTA does not refund WHT easily — it's far more efficient to apply the correct rate upfront, which requires having the non-resident recipient provide a valid tax residency certificate before the payment is made.
For a complete list of current treaty rates, see our Oman withholding tax guide.
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How Do You File and Pay Corporate Tax in Oman?
Oman's corporate tax year is the calendar year (1 January to 31 December) for most businesses. Companies incorporated mid-year may have a short first period; companies with a non-calendar financial year can apply to the OTA for approval to use a different tax year (PwC, Worldwide Tax Summaries, December 2025).
Advance payments: Taxpayers have the option to pay tax in instalments during the tax year, subject to fulfilment of certain conditions and prior approval from the OTA (PwC, "Oman – Corporate – Tax administration," Worldwide Tax Summaries, December 2025). This is not a mandatory instalment system but an election — businesses expecting a large year-end liability should apply early in the year to manage cash flow.
Annual tax return: The annual corporate tax return must be filed with the OTA by 30 April of the year following the tax year — so a 2025 return is due 30 April 2026. The return must be accompanied by audited financial statements. An extension may be available on application, but it's not automatic.
Payment of balance: Any balance of tax due (actual liability minus advance payments already made) is due on 30 April along with the return. If advance payments exceed the actual liability, the excess is refunded or credited against future tax.
OTA filing portal: All returns are filed electronically through the OTA's Tax Management System (TMS) portal at tms.taxoman.gov.om. The portal also handles VAT returns, withholding tax remittances, and registration changes.
Penalties for late filing: Late filing attracts a penalty of OMR 100 to OMR 2,000 under the Income Tax Law (PwC, "Oman – Corporate – Tax administration," Worldwide Tax Summaries, December 2025). Late payment of any balance due accrues interest at 1% per month from the due date until settlement. The OTA has the authority to issue an estimated assessment if a return isn't filed — which may become final if not challenged within the statutory appeal period.
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How Does Oman Corporate Tax Compare Across the GCC?
The GCC has undergone significant corporate tax reform since 2017, with both the UAE (June 2023) and Bahrain (January 2025 for MNEs) introducing new CIT regimes (Deloitte, "GCC Tax Developments 2025", October 2025). Oman's existing 15% rate, unchanged since 2009, now sits at the higher end of the GCC range — though the comparison is complicated by each country's definition of taxable income and the existence of preferential regimes.
Key differences to know if your business operates across borders:
UAE vs Oman: UAE CIT (9%) is lower than Oman's (15%), but UAE has no withholding tax. Oman retains 10% WHT on cross-border royalties, management fees, and service fees — a real additional cost for multinationals. However, Oman's January 2023 suspension of WHT on dividends and interest has significantly narrowed the gap. UAE also has the Qualifying Free Zone Person regime (0% on qualifying income) that has no Oman equivalent.
Saudi Arabia vs Oman: Saudi's 20% CIT applies to the foreign-ownership portion of a business; Saudi shareholders pay Zakat instead of CIT. The effective rate for a joint venture with mixed Saudi and foreign ownership is blended. Oman doesn't have a Zakat obligation — all taxable income, regardless of the nationality of shareholders, is subject to CIT.
Free zone differences: Oman's free zones (Sohar, Salalah Free Zone, Duqm Special Economic Zone) offer CIT exemptions typically ranging from 5 to 30 years, with some zones extending exemptions further. These exemptions are contractual — written into the investment agreement — rather than statutory, and renewal is not guaranteed. For full details, see our Oman free zones tax guide.
Despite Oman's higher headline CIT rate, the effective tax burden for a mid-sized manufacturing business in Oman may be lower than it first appears once the suspended WHT on dividends, DTT-reduced rates on royalties, free zone exemptions, and deductible depreciation are factored in. Headline rate comparisons are useful for orientation but unreliable for operational planning. Always model the full structure.
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Frequently Asked Questions
Frequently Asked Questions
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Sources
- PwC, "Oman – Corporate – Taxes on corporate income," Worldwide Tax Summaries, retrieved 2026-06-15, https://taxsummaries.pwc.com/oman/corporate/taxes-on-corporate-income
- PwC, "Oman – Corporate – Withholding taxes," Worldwide Tax Summaries, retrieved 2026-06-15, https://taxsummaries.pwc.com/oman/corporate/withholding-taxes
- PwC, "Oman – Corporate – Deductions," Worldwide Tax Summaries, retrieved 2026-06-15, https://taxsummaries.pwc.com/oman/corporate/deductions
- PwC, "Oman – Corporate – Tax administration," Worldwide Tax Summaries, retrieved 2026-06-15, https://taxsummaries.pwc.com/oman/corporate/tax-administration
- Deloitte Middle East, "Middle East Tax Handbook 2025," retrieved 2026-06-15, https://www.deloitte.com/middle-east/en/services/tax.html
- Oman Tax Authority, "Income Tax Law (Royal Decree No. 28/2009)," retrieved 2026-06-15, https://tms.taxoman.gov.om/portal/it-law-regulations
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*This article is general information, not legal or tax advice. Tax rules are subject to change. Verify current requirements with the Oman Tax Authority at tms.taxoman.gov.om or a qualified tax adviser.*