Avira,
I am with you on not paying extra to IRS, and so does American law, you are allowed to take allowable …
But I disagree in business. People see what you are doing and opportunities for both kiddush and hillul Hashem are everywhere.
I was once in an expensive course in job search after a layoff.. the trainer was guiding me how to highlight my strengths via light gnevat daas in a mock interview. I was a bad student. After several attempts, she stopped and said that she actually believes me more the way I talk… In an earlier case, a non Jewish employer told me later that he hired me over another candidate because I was asking about what I don’t know, and the other guy claimed knowing everything