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Federal tax rules and regs are always subject to change, so tax lawyer and CPA David De Jong keeps a comprehensive, running list of the top developments over the previous 12 months, including legislative developments, court cases, and IRS pronouncements.

De Jong, a partner in the Rockville, Md., firm Stein Sperling Bennett De Jong Driscoll PC, regularly updates the list, which often includes scores of new developments; here are 15 from his current list, which covers July 1, 2016 to June 30, 2017.