State Tax Comparison: What to Consider Beyond the Top Rate
Top-line state tax rates don't tell the whole story. Here's what to compare when evaluating state income taxes: brackets, deductions, capital gains treatment, and more.
When people compare state income taxes, they often focus on the top marginal rate. But the top rate alone can be misleading. A state with a high top rate might have generous deductions or exemptions that reduce effective taxes for many filers.
Several key factors differentiate state tax burdens beyond the headline rate. First, bracket structure matters: a state with a high top rate that kicks in only above $1 million affects very few earners, while a state with a moderate flat rate applies equally to all income levels.
Second, standard deductions vary dramatically. California offers a roughly $5,700 standard deduction for single filers, while the federal deduction for 2025 is $15,750. Some states have no standard deduction at all and instead start taxing from the first dollar.
Third, capital gains treatment differs by state. Nine states have no personal income tax at all (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming). Among states that do tax income, some exempt long-term capital gains partially or fully, while others tax them at the same rates as ordinary income.
Washington presents an interesting case: it has no general income tax but imposes a 7% tax on long-term capital gains above $270,000 (as of 2025). This makes Washington very tax-friendly for wage earners but less so for investors with large realized gains.
Corporate taxes add another dimension. States like North Carolina have been cutting corporate rates aggressively (down to 2.5% for 2025), while states like New Jersey maintain rates above 11%. If you're evaluating business formation, the combined federal-plus-state corporate rate can vary by 10+ percentage points depending on the state.
The TaxMath calculator lets you compare all of these factors at once. Enter your income breakdown, select the states you're considering, and see the complete picture — federal, state, capital gains, and corporate — in one table.