No Tax Treaty, No Totalization Agreement
Cambodia has neither a bilateral income tax treaty nor a Totalization Agreement with the United States. For most salaried Americans here, this matters less in practice than it might in a higher-tax or higher-earning posting, since the FEIE alone shields most Cambodia salaries entirely. It matters considerably more for the self-employed.
What a Treaty Would Normally Provide
Tax treaties typically reduce withholding on cross-border dividends, interest, and royalties, and provide residency tie-breaker rules for dual-residency situations. Without one, standard Cambodian withholding applies to any relevant cross-border payments, with no treaty-negotiated reduction available, and no formal mechanism to resolve a genuine dual-residency dispute beyond each country's own domestic rules.
No Totalization Agreement: The Self-Employment Tax Trap
Totalization Agreements normally prevent double payment of social security taxes between two countries. None exists here, so self-employed Americans, freelancers, remote contractors invoicing directly, small business owners with a Patent Tax certificate, generally owe the full 15.3% US self-employment tax on net earnings, with no Cambodian social contribution to offset it against.
Employees vs. Self-Employed
A standard payroll employee of an NGO, school, or private company doesn't pay self-employment tax, their employer handles standard structures. The gap specifically hits independent contractors and remote workers structured as self-employed, precisely the population facing the tightened enforcement covered in our Digital Nomad & Remote Worker Status guide.
Worked Example: A Freelance Consultant
An American freelance marketing consultant in Phnom Penh, now properly registered with a work permit given 2026's tighter enforcement, bills $60,000 to international clients. The FEIE shields the income from US income tax, but self-employment tax is calculated separately: he owes roughly $8,500 in SE tax (15.3%), unaffected by the FEIE and with no Cambodian social contribution to credit against it, the same structural gap as in Vietnam, Oman, or any other no-treaty, no-totalization country.