All his properties are in corporations or limited liabilities, like almost every other business in the country. Those corporations do pay taxes. His securities,

All his properties are in corporations or limited liabilities, like almost every other business in the country. Those corporations do pay taxes. His securities, investments, etc. are in a trust, required by law, I believe, which would also pay taxes separately. He donates to charity 100% of his US government salary. I'm wondering how he even owed $750 on federal taxes.