An obscure new government-accounting rule covering budgets from calendar 2016 and beyond will require states and most cities, counties and school districts to report how much revenue they lose to economic development tax breaks. Governmental Accounting Standards Board (GASB) Statement No. 77 will enable big-picture and comparative analyses never before possible. From an activist who helped win the rule, a state official overseeing the rule's implementation, and veteran GASB reporter, learn how the Statement works, where the data will reside, who else is watching, and what the data could reveal. For reporters covering public budget issues, Statement No. 77 is likely to prove an investigative gold mine.