The income requirements for filing taxes are quite low. If filing single, you need to file a federal return if you earned more than $10,300 in 2015. The amount doubles for a married couple. If you earned more than $8,000, you need to file a state return. Filing a return is necessary if you expect a refund of taxes withheld by an employer or through the Earned Income Tax Credit.
With this background, an investigation by the Boston Globe indicated that a Massachusetts investor and developer only filed one state return in the last quarter-century. In lawsuits questioning his dealings in real estate transactions, there is evidence that the man earned significant profits.