Alex, a U.S. citizen, became a resident of Belgium in 2016. Alex will no longer be subject to U.S. taxation on income he earns in Belgium if such income is exempted from tax under the U.S. - Belgium treaty.
The United States taxes its citizens on a worldwide basis. Alex will continue to be subject to U.S. tax on income he earns in Belgium.

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The Answer of Alex, a U.S. citizen, became a resident of Belgium in 2016. Alex will no longer be subject to U.S. taxation on income he earns in Belgium if such income is exempted from tax under the U.S. - Belgium treaty.
The United States taxes its citizens on a worldwide basis. Alex will continue to be subject to U.S. tax on income he earns in Belgium.

Alex, a US