Why might two people in the same state with the same salary pay different rates of income tax?

Two people in the same state with the same salary may pay different rates of income tax due to various factors, such as their filing status (e.g., single, married, head of household), deductions, and credits claimed on their tax returns. Additionally, differences in sources of income, such as wages versus capital gains, can also affect their effective tax rates. Other considerations include local taxes or specific tax incentives that may apply to one individual and not the other.