Otherwise you very much risk wandering in to social services, and managing this can be unfair too.
If you really want to hold me to a number, then each country has a “poverty index” of some form, if you are able to assist with a roof over someones head and provide them with as much as needed to be over the poverty line, then you’re well on your way to dragging someone out of being poor. The important caveat is one time investments (like buying a cheap car, fixing a car or getting rid of a fine) are sometimes needed and this is what separates poor from everything else: being able to invest in common sense things that are simply impossible because the money simply does not exist to do it.
Being a lifeline to those in need is the best possible thing you can be in this case, as you’re taking the “it’s not cheap being poor” mantra away.