Mark Anderson, US CPA in Thailand & US Expat Tax Help

Living abroad as an American comes with incredible freedom — but it also comes with a tax obligation that follows you across every border. The United States is one of only two countries in the world that taxes its citizens on worldwide income, regardless of where they live. If you are a US citizen or green card holder residing overseas, understanding how US expat tax services work is not optional. It is essential. This guide breaks down everything you need to know in 2026 — from filing requirements and key deadlines to the exclusions that can legally reduce your tax bill to zero. Why Americans Abroad Still Owe the IRS Many expats are surprised to discover that moving out of the US does not end their IRS obligations. As the IRS confirms, US citizens and resident aliens must report worldwide income from all sources and file returns under the same rules that apply domestically. Living in Thailand, Portugal, or anywhere else does not grant an exemption. This is precisely why working with ...