Depending on the tax laws of the country you move to and the country you are leaving, you may or may not have to pay taxes in both countries. Some countries have tax agreements with each other to avoid double taxation, while others tax residents on their worldwide income. For example, if the country you are moving to has a tax agreement with the U.S., you may be exempt from paying taxes on your worldwide income. However, if you are moving to a country that does not have such an agreement with your home country, you may be required to pay taxes in both places. In some cases, this can lead to double taxation and result in higher taxes than what would have been due if you were only taxed once.

When in doubt about whether or not you have to file, consult an accountant or tax professional who is familiar with international taxes.