A business owner can easily declare Php minimal salary since they earn anyway from dividends/honorariums/ professional fees, etc. Too many loopholes in the system that taxing the 'wealthy' becomes irrelevant. The tax bureau should be smarter.
There's an economic incentive for the people to fix the problem not fix it because they have an economic gain being the counter party. Politicians run the office to protect their businesses is a norm and whenever talks about improving tax situations fall into silence. The news would contain things like borrowing more money to finance the deficit instead of putting more burden on those that have deeper pockets.