State income tax is levied by 41 US states on top of federal income tax. Rates vary widely — California's top rate is 13.3%, while Texas, Florida, Nevada, Washington, Wyoming, South Dakota, Tennessee, and Alaska have no state income tax. New Hampshire taxes only investment income. Most state taxes follow federal taxable income with state-specific adjustments. State and local tax (SALT) deduction is capped at $10,000 federally — a significant burden for high earners in high-tax states. State residency matters: spending 183+ days makes you a tax resident. Moving from California to Florida can save 10%+ on income, but state-specific rules govern when residency actually shifts.
Article
Alternative Minimum Tax
Alternative Minimum Tax (AMT) is a parallel tax system designed to ensure high-income taxpayers pay a minimum. Calculate…
American Opportunity Credit
The American Opportunity Credit provides up to $2,500 per student per year for the first four years of…
Bunching Deductions
Bunching deductions is the strategy of concentrating itemizable expenses into alternating years to exceed the standard deduction in…
Charitable Contribution Deduction
Charitable contribution deductions allow taxpayers who itemize to deduct cash donations to qualified 501(c)(3) charities up to 60%…
Child Tax Credit
The Child Tax Credit (CTC) provides $2,000 per qualifying child under 17, with $1,600 refundable as the Additional…
Deductible Business Expense
A deductible business expense must be both 'ordinary' (common in your industry) and 'necessary' (helpful to the business).…
State Income Tax
August 22, 2026 · Aditya Gupta
Tax
Related terms
Alternative Minimum Tax
Alternative Minimum Tax (AMT) is a parallel tax system designed to ensure high-income taxpayers pay a minimum. Calculate…
American Opportunity Credit
The American Opportunity Credit provides up to $2,500 per student per year for the first four years of…
Bunching Deductions
Bunching deductions is the strategy of concentrating itemizable expenses into alternating years to exceed the standard deduction in…
Charitable Contribution Deduction
Charitable contribution deductions allow taxpayers who itemize to deduct cash donations to qualified 501(c)(3) charities up to 60%…
Child Tax Credit
The Child Tax Credit (CTC) provides $2,000 per qualifying child under 17, with $1,600 refundable as the Additional…
Deductible Business Expense
A deductible business expense must be both 'ordinary' (common in your industry) and 'necessary' (helpful to the business).…
