What it means
Every country sets its own tax rules, so a business operating in two or more countries can face claims from both. Two main principles apply.
Residence-based taxation lets a country tax the worldwide income of its residents, while source-based taxation lets a country tax income that arises within its borders, whoever earns it. When both principles apply to the same income, the result is double taxation.
Countries reduce this with double taxation treaties and with domestic reliefs such as foreign tax credits, which allow tax paid abroad to be set against the tax due at home, or exemptions, which exclude certain foreign income. Several issues arise repeatedly for businesses.
A permanent establishment, such as an office or a dependent agent in another country, can create a local tax liability, and withholding taxes may be deducted from dividends, interest and royalties paid abroad at a rate that depends on the treaty. Indirect taxes such as VAT or sales tax also apply to cross-border sales, and the rules on who must account for them differ.
Transfer pricing is a core topic. Prices charged between companies in the same group must be set as if the companies were independent, so that profit is not moved artificially to low-tax countries.
Authorities require documentation and may adjust prices that look unreasonable. Individuals matter too.
Employees working abroad can create tax and social security obligations for both themselves and their employer, and remote working across borders has made this harder to manage. Because the rules are complex and change often, businesses should seek local advice before expanding.
Rates, thresholds and treaty terms are set by each jurisdiction, and a plan that works in one country may fail in another. Building a tax review into any international launch plan is far cheaper than fixing mistakes afterwards.
In practice
Real-world examples
Example 1
An online retailer based in one country sells to customers in ten others. It registers for local sales tax or VAT where required, because selling above certain thresholds creates an obligation to collect and pay tax in the buyer's country.
Example 2
A manufacturing firm pays royalties of $500,000 to a related company abroad for the use of a brand. A withholding tax is deducted at the treaty rate before payment, and the firm records the amount as tax owed to the foreign authority.
Example 3
A consulting firm sends three consultants to work in another country for eight months. The local rules treat the project as a permanent establishment, so the firm must register, file a local return and pay tax on the profit earned there.
Think of it
Imagine playing a board game where you land on properties in different regions. Each region has its own toll booth and collection rules. If you do not plan your route, you might end up paying multiple tolls for the same journey, unless you use special travel passes designed to give you credit for tolls already paid.
Formula
Calculation
Additional home tax = home tax on foreign income - foreign tax credit (credit limited to the lower of foreign tax paid and home tax on that income)
A company earns $200,000 of profit abroad that is taxed there at an illustrative 15%, so foreign tax is $200,000 x 15% = $30,000. At home, the same income would be taxed at an illustrative 25%, which is $200,000 x 25% = $50,000. The credit is the lower of $30,000 and $50,000, so it is $30,000. Additional home tax = $50,000 - $30,000 = $20,000, and total tax is $30,000 + $20,000 = $50,000, which is 25% of the income.Case study
Seen in the real world
Stonebridge Digital is an illustrative, fictional software company based in one country, with a small team selling its product in two others. The founders assumed that because they had no foreign offices, they owed no foreign tax.
An advisory review found that a sales representative working from home in one of the countries had authority to sign contracts, which could create a permanent establishment. The review also found that royalties collected from customers in the second country had been subject to withholding tax that Stonebridge had not claimed as a credit.
The company registered locally, claimed credits of $74,000 and put contract-signing rules in place. In this illustrative case, early advice avoided penalties and recovered tax that would have been lost.
Watch out
Common mistakes
- Assuming that having no office in a country means no tax there, when staff, agents or sales above a threshold can create obligations.
- Ignoring withholding taxes on cross-border payments, which can leave the payer liable for the unpaid amount.
- Setting group prices without documentation, which invites adjustment and penalties from tax authorities.
Questions
People also ask
What is a double taxation treaty?
It is an agreement between two countries that decides who may tax certain income and at what rate, to avoid the same profit being taxed twice.
What is a permanent establishment?
It is a fixed place of business or a dependent agent in a country that gives that country the right to tax the profit earned there.
Do individuals face cross border tax issues?
Yes, people who live in one country and work in another, or move between them, can have tax and social security obligations in both.