State Individual Income Tax Rates and Brackets for 2018

by Morgan Scarboro, Tax Foundation, March 5, 2018

Key Findings

• Individual income taxes are a major source of state government revenue, accounting for 37 percent of state tax collections.
• Forty-three states levy individual income taxes. Forty-one tax wage and salary income, while two states—New Hampshire and Tennessee—exclusively tax dividend and interest income. Seven states levy no income tax at all.
• Of those states taxing wages, eight have single-rate tax structures, with one rate applying to all taxable income. Conversely, 33 states levy graduated-rate income taxes, with the number of brackets varying widely by state. Hawaii now has 12 brackets, the most in the country.
• States’ approaches to income taxes vary in other details as well. Some states double their single-bracket widths for married filers to avoid the “marriage penalty.” Some states index tax brackets, exemptions, and deductions for inflation; many others do not. Some states tie their standard deductions and personal exemptions to the federal tax code, while others set their own or offer none at all.

Individual income taxes are a major source of state government revenue, accounting for 37 percent of state tax collections.[1] Their prominence in public policy considerations is further enhanced by the fact that individuals are actively responsible for filing their income taxes, in contrast to the indirect payment of sales and excise taxes.

Forty-three states levy individual income taxes. Forty-one tax wage and salary income, while two states—New Hampshire and Tennessee—exclusively tax dividend and interest. Seven states levy no income tax at all. Tennessee is currently phasing out its Hall Tax (income tax applied only to dividends and interest income) and is scheduled to repeal its income tax entirely by 2022.[2]

Of those states taxing wages, eight have single-rate tax structures, with one rate applying to all taxable income. Conversely, 33 states levy graduated-rate income taxes, with the number of brackets varying widely by state. Kansas, for example, imposes a two-bracket income tax system. At the other end of the spectrum, two states—California and Missouri—each have 10 tax brackets. Hawaii has 12 brackets. Top marginal rates range from North Dakota’s 2.9 percent to California’s 13.3 percent.

In some states, a large number of brackets are clustered within a narrow income band; Georgia’s taxpayers reach the state’s sixth and highest bracket at $7,000 in annual income. In other states, the top marginal rate kicks in at $500,000 (New Jersey) or even $1 million (California, when the state’s “millionaire’s tax” surcharge is included).

States’ approaches to income taxes vary in other details as well. Some states double their single-bracket widths for married filers to avoid the “marriage penalty.” Some states index tax brackets, exemptions, and deductions for inflation; many others do not. Some states tie their standard deductions and personal exemptions to the federal tax code, while others set their own or offer none at all. In the following table, we provide the most up-to-date data available on state individual income tax rates, brackets, standard deductions, and personal exemptions for both single and joint filers.

Following the 2017 federal tax reform, it remains to be seen if states that are coupled to the federal standard deduction and personal exemption will maintain that conformity or rather retain their previous deductions and exemptions amounts. The federal bill increased the standard deduction to $12,000 for single filers, but eliminated the personal exemption.[3]

Notable Individual Income Tax Changes in 2018

Several states changed key features of their individual income tax codes between 2017 and 2018, such as:

• Hawaii has reinstated its formerly temporary individual income tax brackets, ranging from 8.25 to 11 percent. [4]
• Mississippi began phasing out its 3 percent individual income tax bracket by exempting the first $1,000 in income. The bracket will be fully phased out by 2022.[5]
• Maine repealed the 3 percent income tax surcharge on earnings over $200,000 approved by voters in November 2016.[6]

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