An example from payroll
Mark does IT support for a bank's back office in Ortigas, on ₱40,000 a month. In December he gets his 13th month of ₱40,000, a ₱10,000 Christmas bonus, and in June he received a ₱5,000 anniversary bonus.
All three go into the same ₱90,000 bucket: ₱40,000 + ₱10,000 + ₱5,000 = ₱55,000. That's ₱35,000 below the ceiling, so none of it is taxed and his December payslip shows no extra withholding. He could receive up to ₱35,000 more in bonuses this year before a single peso becomes taxable.
What else shares the ₱90,000 ceiling
The exemption isn't just for the 13th month. Under the tax code it covers the 13th month pay and other benefits — Christmas bonuses, productivity incentives, loyalty or anniversary bonuses, and the part of de minimis benefits above their own limits. Regular allowances that are part of your monthly compensation are not in the bucket; they're taxed with your salary.
At ₱40,000 a month, your taxable pay is roughly ₱444,600 a year after contributions, which puts you in the 20% bracket. So if your bonuses ever went over the ceiling, each extra ₱1,000 would cost you about ₱200 in tax.