Regarding audits and reviews, the accountant I work with explained that the tax processing computers are programmed to look for significant changes in our tax returns from year to year, especially any changes that result in a big reduction in taxes owing. I've always operated with the principle that it's best to always owe a small amount of tax, rather than no tax at all.

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“Never attempt to teach a pig to sing; it wastes your time and annoys the pig.” ― Robert A. Heinlein