"We want to raise awareness about tax payments and ask the public if the numbers we observe make sense," he said.
The tax bureau last year increased collection by 14.5 percent and filed high-profile complaints, including one against boxing champion Manny Pacquiao and another against former President Gloria Macapagal Arroyo's son. The complaint against Pacquiao was later dropped by the prosecutor.
Paying taxes and accounting for public money has become a major issue for Philippine President Benigno Aquino III, who was elected three years ago on a promise to curb corruption and widespread poverty.
A recent scandal involving the alleged plunder of millions of dollars of development funds intended for anti-poverty projects has led to street demonstrations. Last month, the Justice Department filed corruption complaints against three powerful senators, former lawmakers and a wealthy businesswoman who allegedly conspired to siphon off funds through dummy organizations.