I sometimes use the term guaranteed living allowance instead of the more commonly used "guaranteed basic income" (sometimes known as the more widely applicable "universal basic income" or "UBI").

There are a variety of ways to implement a basic income.  The essential idea is that citizens have the opportunity to receive a fixed sum of money from the government on a regular basis, guaranteed, no questions asked.  It might be based on their current income, or it could 'universally' apply to all.  For those who don't need it, it might be clawed back at tax time, or it might be exempt.  When it was proposed (and very nearly implemented) in the United States in the late 60s, Milton Friedman promoted it as a "negative income tax".

To me, "basic income" suggests that people are freely receiving money that they would otherwise have to work for - a salary for nothing, if you will.  "Guaranteed living allowance" is a better term for a human right to an automatic benefit from society that says regardless of your circumstances at any given time, you have the right to receive the most basic means of survival.

source: Andrew Welch