Tax equalization is a policy under which a mobile expert bears only the hypothetical tax they would have paid at home, while the company absorbs or keeps the difference between the two countries’ actual taxes. Unlike a net salary — where the company bears everything — this model shares the burden and can refund the company when host-country tax is lower. This article sets out the standard four-step calculation template and the data the company must track throughout the assignment, so the policy does not collapse at the first finalisation.
Legal basis and analysis
Core mechanics: withhold hypothetical tax from the expert’s pay using the home-country scale, the company pays the actual Vietnamese tax, and at period-end three figures are reconciled — hypothetical tax retained, actual tax paid, and the difference owed to the company or back to the expert.
A standard template has four data blocks: Vietnam taxable income under Personal Income Tax Law 109/2025/QH15; actual tax withheld and finalised; hypothetical tax computed under the home rules stated in the assignment policy; and the balancing settlement after both sides finalise.
Breakdowns rarely come from the formula; they come from data — parent-paid income never reported into Vietnam, missing withholding certificates, and inconsistent exchange rates between the two calculations; the template must lock data sources and rates from the start of the assignment.
Frequently asked questions
What is tax equalization and how is it calculated?
Tax equalization keeps an assignee ‘tax-neutral’: the expert bears only the hypothetical tax as if still working at home, the company pays the actual Vietnam tax and keeps or absorbs the difference. It is calculated by withholding hypothetical tax each period, finalising actual tax at period-end, then reconciling which side the difference belongs to.
What does the company need to track?
At minimum the company must track: all income paid by both sides that is linked to the assignment, tax withheld and withholding certificates in Vietnam, hypothetical tax retained, the exchange rate used for each conversion and both countries’ finalisation deadlines — miss one data line and the year-end balance cannot be closed.
Is there a standard calculation template?
The four-block template: Vietnam income and actual tax; hypothetical tax under the assignment policy; the difference after both finalisations; and the settlement amount with its payment deadline. The template is only a frame — the company must load its home-country parameters and group rules before applying it to a specific individual.
When should it be applied?
Apply it when assignments have clear terms, headcount is large enough to run periodic reconciliations, and the cross-country tax gap is material. For a few short positions, a simple net salary can cost less than operating equalization; decide by comparing total cost of both models over one sample assignment.
This article has been quality-reviewed by the FLAW AI Legal Council