The personal tax milestone has been set: once you become a US tax resident, your family reports worldwide income to the US — while income streams in your home country remain subject to home-country tax law. Two systems overlap, and one critical detail must be understood correctly: your home country and the US currently have no active tax treaty to prevent double taxation — meaning there is no automatic treaty shield. All double-taxation avoidance flows through each country's domestic law, with the US foreign tax credit as the primary tool.
Good news: for the common income streams of business-owning families, domestic law mechanisms handle most of the overlap — if your structure is correct and documentation is complete. This article maps each stream: salary, dividends, business profit, intercompany transactions, real estate — which income is taxed where, how to avoid overlap, and which structures to avoid from the start. As always: this is a conceptual map; your specific path belongs to your Vietnam and US accounting team.
Legal Status: No Active Treaty, and What That Means
Your home country and the US have signed a tax treaty, but the instrument has not completed ratification to become effective — so unlike business owners from countries with active treaties (where the treaty defines taxing rights and provides relief mechanisms), the home-country / US pair operates purely under domestic law. Practical consequence: you cannot rely on familiar treaty concepts (preferential dividend rates across borders, residency tie-breakers) — the primary US tool is the foreign tax credit, which deducts taxes already paid in your home country against US obligations on the same income stream, within its technical limits.
This status may change in the future — one more reason why your dual-tax picture should be reviewed annually with a specialist rather than set once and forgotten: an active treaty will redraw several income streams on the map below.
Stream 1 — Salary: One Person, Two Sources, Two Withholding Systems
Common setup: you receive salary from your US branch (clean withholding through US payroll), and the question arises about salary retained at your parent company in your home country: in principle, that income remains subject to home-country personal income tax under rules for non-residents or residents (depending on status), and also appears on your US worldwide income return — the home-country tax paid goes into the foreign tax credit pool.
A structural point worth discussing with your specialist: after moving to the US, how should your role at the parent company be compensated to align across all three lenses — dual taxation, documentation (maintaining the paper trail of a multinational manager role), and actual cash flow. Many families shift their parent-company income structure from salary toward dividends after relocating to the US — each approach has different tax consequences, with no default answer.
Stream 2 — Dividends from Your Parent Company: The Main Value Flow to Your Family
When your home-country company distributes profit to you as a US tax resident: your home country withholds personal income tax on the dividend under current rules; the US includes this amount in worldwide income — and the home-country tax already paid is claimed as a deduction through the foreign tax credit. The net result is typically: total burden approaches the level of whichever system taxes higher on that stream, rather than adding both together — that is the value of the credit mechanism when documentation is complete.
Documentation is the keyword: proof of dividend withholding from your home country (correct name, correct period, correct amount) is mandatory material for the credit — without it, dividends face real double taxation not because of law but because of paperwork. The timing of dividend distributions during the year also matters to your CPA: concentrated or spread, before or after tax milestones, each choice has real consequences.
Stream 3 — Business Profit and Intercompany Transactions: The Corporate Layer
At the entity level: your US branch pays US corporate income tax on its profit; your parent company pays tax in your home country — two separate legal entities, two independent obligations, and the bridge between them is intercompany transactions discussed throughout this section: the price at which goods and services move between the two (transfer pricing) must be at arm's length with documentation, because both tax authorities have the right to challenge a price that shifts profit to the other side — and your foreign-parent structure carries the obligation to report related-party transaction information at both ends (Form 5472 on the US side is familiar from compliance; your home country has its own related-party transaction rules).
One notably favorable point in the structure where your home-country parent owns a US subsidiary: profit retained and reinvested by the US branch does not automatically create an immediate tax obligation for your home country — the obligation arises only when profit is distributed. A retention-versus-distribution plan is therefore a real strategic variable in your dual-tax equation, worth modeling with your specialist before major decisions.
Stream 4 and Structures to Avoid: Real Estate, Savings, and Three Costly Shortcuts
Personal assets remaining in your home country: rental real estate (rental income is taxed in your home country, appears on your US return with corresponding credit; asset sales follow each jurisdiction's capital gains rules — large sales always warrant a CPA conversation beforehand), interest on deposits and financial investments (modest amounts but reportable, and this entire category falls within the FBAR/FATCA scope from earlier sections).
Three shortcuts to avoid from the start because they become expensive later: hiding home-country income streams from your US return (international underreporting penalties are severe and financial information exchange systems are expanding), inflating intercompany transaction prices to shift profit to the lower-tax side (transfer pricing risk at both ends), and running business cash flows into personal accounts for convenience (simultaneously breaking your books, tax reporting, and the source-of-funds narrative in your file). The dual-tax picture is complex but manageable — with one condition repeated throughout this section: your Vietnam accounting lead and your US CPA know each other, reconcile quarterly, and every major financial decision passes through both before you sign.
Disclaimer: this article is informational reference material, not legal, tax, or immigration advice. Visa-L1.com is a business consulting and operations firm, not a law firm; all L-1A and EB-1C legal documents are prepared and filed directly by licensed US immigration attorneys. Government fees, tax rules, and currency regulations change and must be verified with a specialist at the time of execution.
Frequently Asked Questions
Do your home country and the US have a tax treaty to prevent double taxation?
The two countries have signed a treaty, but the instrument has not completed ratification to become effective — it is not currently in force. Double-taxation avoidance therefore flows through each country's domestic law, primarily the US foreign tax credit: deducting taxes already paid in your home country against US obligations on the same income stream, provided your home-country tax payment documentation is complete and meets standards.
Do dividends from your home-country company face double taxation?
Standard mechanism: your home country withholds dividend tax under its rules, the US includes the amount in worldwide income and allows a deduction for taxes already paid through the foreign tax credit — the net result typically approaches the level of whichever system taxes higher, rather than adding both. The survival condition is documentation: withholding proof with correct name, period, and amount; without it you face real double taxation because of paperwork, not law.
Does profit retained by your US branch face tax in your home country?
Your US branch pays US corporate income tax on its profit; in your home country, your parent company's obligation on this amount typically arises when profit is distributed (under the framework governing foreign investment and current tax rules) — profit retained and reinvested is a strategic variable in your dual-tax equation. A retention-versus-distribution plan should be modeled with your specialist before major decisions.
When two companies buy and sell to each other, how should pricing be set for tax safety?
Follow arm's-length pricing principles (comparable to transactions between unrelated parties), with the obligation to report related-party transactions at both ends — Form 5472 on the US side and your home country's related-party transaction rules. Inflating prices to shift profit to the lower-tax side is a shortcut both tax authorities have tools to catch; solid transfer pricing documentation prepared by your US and home-country CPAs working together is the right insurance layer.
