An income is the money you earn for providing a service.
Sure you do if you owe any amount after your income tax return is completely correctly.
Rental income may be considered unearned income. It depends on how active you are in managing the investment. Most RE professionals, and others, qualify as active and are not hindered by the inactive...
Income - means wages or salary.
The (PPP) per capita GDP of United States is $46,381.