No one likes paying legal fees, but tax deductions can make them a lot less painful. With a 40% tax rate, $10,000 in deductible legal fees costs you only $6,000. But if your legal fees are to get divorced or because a family member sues you for slander, the legal fees are purely personal and non-deductible. See How To Make Divorce Less Taxing. Distinguish purely personal expenses from investment expenses.