New Mexico Marginal vs Effective Tax Rate

Your marginal tax rate is the rate on your last dollar earned. Your effective rate is total tax ÷ total income — always lower than marginal. State tax is computed using New Mexico's actual tax brackets, both for the dollar amount owed and for the rate on the next dollar (the rate of the bracket that holds New Mexico taxable income, plus any credit that phases out as income rises). New Mexico has progressive brackets up to 5.9%, so your effective state rate will be lower than your marginal bracket unless your entire income falls in the top bracket. For a single filer, New Mexico's rates apply to gross income less New Mexico's own allowance: New Mexico subtracts the $15,750 federal standard deduction and, up to $36,667 of income, its low- and middle-income exemption ($2,500 less 15% of income above $20,000) (tax year 2025). For a married couple the calculator subtracts only the New Mexico deduction you enter.