One way to make life easier for underpaid people doing work that helps individuals but doesn't 'make' more money would be to let nonprofits issue a complementary currency and do the legwork to get it accepted for lifestyle-enhancing services that might not otherwise be available to those volunteers/employees. Wouldn't pay rent, but would let them save money on yoga classes or house cleaning or the like. Barter networks exist, as do non-profit service-based time-denominated currencies. Nobody's doing it in a clean, unified way, but that might be more likely to happen than a tax credit, given the current political environment. :-/