The most obvious example of an international treaty is registering a company offshore, where there are no taxes on foreign profits. You can minimise tax burden via numerous double taxation treaties, whereby the same income does not get taxed twice. The main thing is to make sure that a relevant treaty has been signed between your country of residence and the tax haven where your company is registered.
However, a fight against “aggressive tax planning”, anti-offshore laws adopted by countries, and widespread information exchange complicate the use of offshores.
Therefore, instead of offshores, companies are often registered in countries with the following conditions for tax optimisation:
Low corporation tax rates for certain types of companies
Tax benefits for small and medium-sized businesses
Nuances of corporate or tax law allowing a significant reduction of the tax burden.