Oman is the Gulf’s approaching exception. Today it charges 0% personal income tax, and with no US-Oman income tax treaty in force, the only levy a US dividend meets is the full 30% American statutory withholding. That arrangement now has an expiry date printed on it. Under Royal Decree No. 56/2025, issued June 22, 2025, Oman becomes the first GCC country with a personal income tax on January 1, 2028: a flat 5% on tax residents’ worldwide gross income above OMR 42,000/year (roughly USD 109,200) - and the law explicitly names dividends and capital gains from shares within its taxable scope.
This guide covers today’s tax picture and what changes in 2028.
Today, Through 2027: No Treaty, 0% Domestic Tax
With no income tax treaty between the US and Oman, there’s no treaty article to reduce the default US rate. Every US dividend paid to an Oman-resident investor is withheld at the full 30% statutory rate.
Filing Form W-8BEN is still worth doing. No rate relief follows, but the form documents non-US status and averts backup withholding.
Through the end of 2027, Oman charges 0% personal income tax - the entire cost of investing in US stocks from Oman today is the 30% US withholding itself, with no Omani layer to add or credit against.
2028: Oman’s Personal Income Tax, and What It Covers
This is the genuinely new, forward-looking fact for anyone planning to invest from Oman long-term.
The law: Royal Decree No. 56/2025 introduces a flat 5% tax on tax residents’ annual gross worldwide income exceeding OMR 42,000 (approximately USD 109,200), effective January 1, 2028. Tax residency generally means Omani citizens and non-Omanis present in Oman for 183 or more days in a year. Oman’s Tax Authority estimates roughly 99% of the population will remain below the threshold and unaffected.
What counts as taxable income - and it’s broader than salary: the law’s gross income sources explicitly include profits from shares, equity interests, and sukuk, and proceeds from their disposal, alongside salaries, self-employment income, leasing, royalties, interest, real estate disposal proceeds, and several other categories. Dividends and capital gains from a personal US stock portfolio fall within this scope - this isn’t a payroll-only tax.
Notable exclusion: foreign salary income is explicitly excluded from the calculation, along with gains on the sale of a main residence and inheritance - but investment returns like dividends and capital gains don’t get a comparable carve-out based on current published guidance.
What this means for planning: an Oman-resident investor whose worldwide income (salary plus dividends plus capital gains plus everything else in scope) stays under OMR 42,000/year sees no change at all in 2028. An investor with total worldwide income above that threshold will see a portion of their US dividend and capital gains income become subject to Oman’s new 5% tax for the first time - on top of, not instead of, the 30% US withholding that already applies today. Executive Regulations detailing exact procedures and forms are due within a year of the law’s publication (by mid-2026), so more mechanical detail - including how foreign tax paid to the US factors in - is still emerging as of this writing.
Broker Availability in Oman
Interactive Brokers and eToro both take on Omani account holders.
The Operational Side for Omani Investors
Holding US stocks from Oman - cover these:
- File W-8BEN as a status document - the 30% is unaffected, but the form keeps backup withholding off the account
- Through 2027, expect 30% US withholding as your only tax cost - Oman currently charges 0% personal tax
- Starting January 1, 2028, track your total worldwide gross income (salary plus dividends plus capital gains plus other sources) against the OMR 42,000 threshold
- If you expect to be above that threshold from 2028 onward, budget for Oman’s new 5% tax applying to your US dividends and capital gains, on top of the existing 30% US withholding
- Watch for Oman’s Executive Regulations (expected by mid-2026) for the exact mechanics of how the 2028 tax will be calculated and whether foreign tax credit relief will be available
- Check what the broker asks of Omani applicants now - requirements are revised without announcement
Weighing It Up from Oman
There’s no US-Oman tax treaty, so the full 30% US withholding applies with no reduction available today, and Oman currently charges 0% personal tax - through the end of 2027. That changes on January 1, 2028, when Oman becomes the first Gulf country with a personal income tax: a flat 5% on worldwide income above roughly USD 109,200/year, explicitly covering dividends and capital gains from a stock portfolio, not just salary. For most individual investors below that threshold, nothing changes. For higher earners, this is a genuine, dateable shift worth planning around now rather than being caught by it in 2028.
A starting point on investing from Oman rather than professional guidance. There is no US-Oman income tax treaty. Oman’s Personal Income Tax Law (Royal Decree No. 56/2025) takes effect January 1, 2028; Executive Regulations with full implementation detail were still pending as of this writing. Always consult a qualified Omani tax advisor before you act on it as the regulations are finalized.
Sources: KPMG Oman - Oman Announces the Introduction of Personal Income Tax Effective 1 January 2028; KPMG Global Mobility Services - Flash Alert 2025-122; EY - Oman to Introduce Personal Income Tax from January 2028; Vialto Partners - Oman Makes History: Personal Income Tax Law Enacted via Royal Decree; Dhruva Consultants - Oman Breaks Ground with Personal Income Tax Law; Oman Tax Authority Portal (taxoman.gov.om) - Issuance of Personal Income Tax (PIT) Law; IRS Publication 515 (2026).
