SSS will improve your future, and it's important to pay the proper taxes. And a birth certificate is usually required to get either one.
For most, if not all, employees that is not a problem. Employers often help them acquire these, or at least give them time to do so. The self-employed, freelancers, enterprising students, and the less affluent residing in provinces (or even in the metro) aren't as lucky though.
However, just because you don't have the right documentation right now doesn't mean there's not much else you can do in the meantime.
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