Tax equalization is a policy applied by some international companies under which employees who are hired in one country and later accept a (temporary) assignment in another country do not have their total after-tax ("take-home") compensation changed depending on the tax regimes of the country they move to.
The policy of "tax equalization" aims to ensure that employees' total take-home pay remains consistent when they move from one country to another for a temporary assignment. This policy is used by some international companies to avoid any changes in compensation due to differences in tax laws between countries.