How is gross income different from net income?

if by annual income you mean sum of all type of incomes during the year then yup its the net income.

Gross Income- The Internal Revenue Code defines gross income as "except as otherwise provided..., all income from whatever source derived." The "except as otherwise provided" refers to...

The (PPP) per capita GDP of United States is $46,381.

Gross income is the total amount of money you earned, before taxes and any benefits are paid for. Net income is the amount of money you actually received on your paycheck after taxes and any benefits...

That would do it for me, but unfortunately for me my net income is equal to my gross income minus taxes.