A real-world example
Bea, an operations lead at a shared-services centre in Alabang on ₱90,000, gets her ₱90,000 13th month plus a ₱10,000 Christmas bonus and a ₱5,000 rice-and-grocery gift card.
Her 13th month uses up the whole ₱90,000 ceiling. The ₱10,000 bonus is fully taxable: at her 25% bracket, about ₱2,500. The gift card is a de minimis benefit if it stays within its own limit (the Christmas-gift item is ₱5,000 a year); anything beyond that limit would also join the taxable pile.
Right at the ceiling: what to watch
When your 13th month equals or exceeds ₱90,000, other bonuses lose their tax-free status entirely. A ₱20,000 performance bonus is worth about ₱15,000 in your pocket instead of ₱20,000.
If you started mid-year, though, your pro-rated 13th month is lower and there's room again: hired on 1 April, your 13th month is ₱67,500, leaving ₱22,500 of tax-free room for bonuses.