New Mexico's top marginal state income tax rate is 5.9%. State tax is progressive here, so most filers pay an effective rate well below the top figure — the calculator applies a blended approximation rather than modeling the full bracket schedule.
Below-average property tax and home prices. Statewide median household income is $60,000, which is the default loaded above.
Remember that a state with no income tax is not automatically cheaper overall. New Mexico has an effective property tax rate of 0.67% and average homeowners insurance of $1,900 a year — states without wage income tax typically recover revenue through property or sales taxes.