Oman’s 5% Income Tax Starts January 2028: The OMR 42,000 Threshold, Deductions, and the 183-Day Exit
The Gulf Cooperation Council has maintained zero personal income tax for decades — that fact made it the primary financial argument for relocating to the region. Oman has ended that argument for anyone earning above OMR 42,000 per year.
Royal Decree No. 56/2025, published in the Oman Official Gazette in Q3 2025, introduced a flat 5% personal income tax on net income exceeding OMR 42,000 annually. The law takes effect January 1, 2028, giving residents approximately two years to prepare. High earners in oil and gas, engineering, finance, and banking — sectors where OMR 42,000 is a routine salary — are facing the first mandatory GCC income tax in history.
This post gives you the exact numbers: your tax liability at five income levels, the deductions that legally reduce your taxable base, and what the 183-day residency test means if you are considering moving to the UAE.
1. The Law: What Royal Decree No. 56/2025 Actually Says
Source: Royal Decree No. 56/2025 (Sultanate of Oman Official Gazette). The decree introduces Part IV-A into Oman’s existing income tax framework (Income Tax Law, Royal Decree No. 28/2009), adding personal income taxation for the first time. Advisory summaries: KPMG Oman, EY MENA, PwC Gulf, DLA Piper (Q3–Q4 2025).
Key provisions:
- Rate: 5% flat on net taxable income exceeding OMR 42,000 per calendar year
- Effective date: January 1, 2028 (first filing year: 2028 returns, due 2029)
- Residents: Taxed on worldwide income if physically present in Oman for 183 or more days in a calendar year
- Non-residents: Taxed on Oman-source income only (salary paid by Oman employer, rental income from Oman property, Oman-based business profits)
- Deductions: Specific categories of expenses reduce gross income to arrive at net taxable income before the OMR 42,000 threshold is applied
2. Your Tax Liability at Five Income Levels
The calculation is straightforward: subtract allowable deductions from gross income to arrive at net income, then apply 5% to the portion above OMR 42,000.
The table below shows gross-income liability before any deductions — the number you owe if you claim nothing.
| Annual Gross Income (OMR) | Income Above Threshold (OMR) | Tax Owed — No Deductions (OMR) | Effective Rate on Total Income |
|---|---|---|---|
| 42,000 | 0 | 0 | 0% |
| 48,000 | 6,000 | 300 | 0.6% |
| 60,000 | 18,000 | 900 | 1.5% |
| 80,000 | 38,000 | 1,900 | 2.4% |
| 120,000 | 78,000 | 3,900 | 3.25% |
The effective rate on total income stays well below 5% at all salary levels because the first OMR 42,000 is fully exempt. At OMR 120,000, your effective rate is 3.25% — comparable to many “low-tax” European jurisdictions. The real bite is on individuals in the OMR 60,000–80,000 band who cannot justify a move purely on tax grounds.
3. Deductions: What Legally Reduces Your Taxable Base
Royal Decree No. 56/2025 specifies categories of allowable deductions. These reduce your gross income to net income before the OMR 42,000 threshold is applied — meaning every OMR 1 of deduction saves you OMR 0.05 in tax.
| Deduction Category | Notes |
|---|---|
| Housing | Actual rent paid or imputed value of employer-provided accommodation |
| Medical expenses | Qualifying treatment for self and dependents; receipts required |
| Education expenses | School and university fees for dependent children |
| Zakat | Calculated under Islamic jurisprudence rules; documented payments |
| Charitable donations | To registered Omani charities; receipts required |
Worked Example: OMR 60,000 Gross, With Deductions
| Item | Amount (OMR) |
|---|---|
| Gross annual income | 60,000 |
| Rent paid (employer does not provide housing) | −7,200 |
| Medical insurance gap and out-of-pocket treatment | −1,500 |
| School fees for two dependent children | −4,800 |
| Zakat | −600 |
| Net taxable income | 45,900 |
| Amount above threshold (45,900 − 42,000) | 3,900 |
| Tax owed | OMR 195 |
Without deductions, the same OMR 60,000 earner owed OMR 900. Deductions cut the bill by 78% in this scenario. The deduction strategy is not avoidance — it is the mechanism the law specifically provides.
4. The 183-Day Rule: What Happens If You Move to UAE
The residency determination is binary and calendar-year based:
- 183+ days in Oman in a calendar year → Tax resident → Worldwide income is taxable
- Fewer than 183 days in Oman → Non-resident → Oman-source income only is taxable
This creates two distinct situations for expats who leave Oman:
Situation A: Clean Break (Move to UAE, No Oman Income)
You relocate to the UAE before July 3 of any year (ensuring fewer than 183 Oman days), you are paid by a UAE employer, you have no Oman rental property. Result: zero Oman PIT liability. This is the scenario most expats assume applies to them.
Situation B: Partial Exit (Move to UAE, Keep Oman Salary or Property)
You relocate to Dubai in March 2028, but your employer is an Oman-registered company and your salary continues to be paid from Muscat. Or you own a rental apartment in Muscat. Result: that Oman-source income remains taxable in Oman even as a non-resident.
Moving to the UAE does not automatically eliminate your Oman tax obligation. Non-residents still pay 5% on Oman-sourced salary, rental income, and business profits above OMR 42,000. If your total Oman-source income exceeds the threshold, the tax applies — regardless of where you physically live.
The Worldwide Income Trap for Residents
If you remain in Oman (183+ days), the law taxes worldwide income. This includes:
- Salary from an Oman employer ✓
- Rental income from a property in India, UK, or Philippines ✓
- Dividends from foreign investments ✓
- Freelance income billed from Oman to overseas clients ✓
Oman’s existing double taxation treaties (with over 30 countries) will govern whether a foreign tax credit applies to reduce double taxation. Treaty status for your home country should be confirmed before 2028.
5. Stay in Oman vs. Move to UAE: The Financial Decision
The question “should I leave because of the new tax?” requires comparing total cost of living, not just the tax rate.
| Factor | Oman (Resident) | UAE (Dubai) |
|---|---|---|
| Income tax (OMR 80K earner) | ~OMR 1,900/year | Zero |
| Average annual rent (3-bed, expat area) | OMR 6,000–9,600 | OMR 18,000–30,000 (AED 65K–110K) |
| Schooling (1 child, international school) | OMR 3,000–5,000 | OMR 7,000–12,000 |
| Annual salary premium (similar role) | Baseline | Often +15–25% for UAE roles |
At OMR 80,000, your Oman PIT is OMR 1,900/year. The Dubai rent premium alone (vs. Muscat) typically exceeds OMR 6,000/year for a comparable property. The tax saving does not fund the lifestyle cost increase. For earners below OMR 80,000, the numbers rarely favor a UAE move on tax grounds alone.
6. Frequently Asked Questions (FAQ)
Q: The law says “effective January 1, 2028.” Does that mean I file my first tax return in January 2028? A: No. The first taxable period is calendar year 2028. Tax returns for 2028 income will be filed in 2029. Exact filing deadlines and the mechanics of withholding (whether employers will deduct at source) are expected to be clarified via implementing regulations before 2028.
Q: I am a non-Omani expat. Does this law apply to me the same way it applies to Omani nationals? A: Yes. The law applies based on residency (183+ days) and income source, not nationality. Omani nationals and foreign residents earning above OMR 42,000 are subject to the same rate and threshold.
Q: My employer provides housing and a car. Are those counted as income? A: Benefits-in-kind treatment under the implementing regulations has not yet been fully published. EY and KPMG advisories note that employer-provided housing will likely be valued and treated as a deduction offset rather than additional income, but confirm this with a tax advisor once implementing regulations are released.
Q: Does Oman have a double tax treaty with my home country? A: Oman has active double tax treaties with approximately 36 countries, including the UK, India, France, Germany, Singapore, and several Arab states. If your home country is on the list and taxes the same income, a credit mechanism typically applies to prevent full double taxation. The treaty with your specific country determines which state has primary taxing rights. Check the Oman Tax Authority website for the current treaty list.
Q: What if the implementing regulations change the deduction list before 2028? A: The Royal Decree establishes the legal framework; implementing regulations refine it. The deduction categories listed here reflect the decree as published. Monitor official Oman Tax Authority communications through 2026–2027 for any additions or restrictions.
Calculate Your Exact Position Before 2028
The Oman Personal Income Tax Calculator is in development on CalcMENA. It will allow you to enter your gross salary, deduction inputs, and residency days to calculate your precise 2028 liability and compare the stay-vs.-leave financial decision.
In the meantime, the worked examples above give you the framework. Start collecting receipts for housing, medical, education, and Zakat from now — the documentation requirement is real and begins the moment the law takes effect.