Earning a Tax- free income

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Would you ever consider working in a foreign country like Egpyt, Kuwait, Yemen to earn a tax-free income? I have heard of many Americans getting their Tefl certificate to work in foreign lands like China, India to get a tax free income, and use it maybe towards getting out of debt or paying for school or supporting a family. They teach mostly English in schools and universities to foreigners. Would working in foreign lands to make tax-free money be a good alternative to getting out of debt faster and having money for college?