How much can a person living alone earn per year before having to pay income tax?

Generally, if your GROSS income is under $8,950 you wont' have to file. But, of course there are many "ifs" and you should read Publication 501 to see if any apply. http://www.irs.gov/pub/irs-pdf/p501.pdf However, even if you don't have to, the list of reasons why you should is very extensive...and includes that many in that situation actually get benefits or money under many of the government programs. (Rememer this years "stimulus payment", which was only for people who filed, even if they didn't have to pay). Also, just common sense: If the Gov't says you don't have to file, why do you think they do this? Becuase it's good for you....or for them?