SE tax funds Social Security (12.4% up to the wage base) and Medicare (2.9%, uncapped) and applies to a US citizen’s self-employment profits worldwide. The FEIE doesn’t reduce it and foreign income tax credits don’t touch it; only a totalization agreement can move you out of the US system — and Türkiye has none with the US. For self-employed Americans, this is often the largest surviving tax under Law 7582.
Self-employment tax
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