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State Effective Tax Rate Calculator

Work out the share of taxable income that goes to state income tax, which is lower than the top bracket wherever brackets apply.

About State Effective Tax Rate Calculator

State Effective Tax Rate Calculator — works out the effective state income-tax rate on your taxable income. The effective rate is the share of income that actually goes to state tax, as opposed to the marginal rate on the last dollar. Under a flat tax the two match, which is why the six verified flat-rate states (Illinois, Pennsylvania, Arizona, Michigan, Tennessee, New Hampshire) show an effective rate equal to the statutory rate. Under a graduated schedule the effective rate is always lower than the top bracket, and a single flat rate cannot reproduce it - so graduated states are unverified and you supply the effective rate from your own return, calculated by dividing your state tax by your taxable income.

Formulas

Effective state tax

Effective state tax = taxable income × state rate

Effective rate

Effective rate = effective state tax / taxable income

Worked example

With the default values below, State Effective Tax Rate Calculator returns Effective Rate of 3.07%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Stateone of Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming
Pennsylvania
Your state tax rateaccepts 0–60
Taxable incomeminimum 0
90,000

Results

Effective Rate
3.07%
Estimated State Income Tax
$2,763.00
Rate Used
3.07%
State rate used
3.07% (verified)
Tax year
2026
Source
https://www.pa.gov/agencies/revenue/resources/tax-types-and-information/personal-income-tax

Step by step

  1. 1Values used
  2. 2Effective state tax
  3. 3Effective rate
  4. 4Effective Rate= 3.07
  5. 5Estimated State Income Tax= 2,763.00
  6. 6Rate Used= 3.07
  7. 7State rate used= 3.07% (verified)
  8. 8Tax year= 2026
  9. 9Source= https://www.pa.gov/agencies/revenue/resources/tax-types-and-information/personal-income-tax

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Reference estimate. Ignores deductions, exemptions, credits, local income taxes and any surtax on high incomes.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Reference estimate. Ignores deductions, exemptions, credits, local income taxes and any surtax on high incomes.

Frequently Asked Questions

What is the difference between effective and marginal rate?

The marginal rate is what the next dollar is taxed at; the effective rate is total tax divided by total income. Under a flat state tax they coincide. Under brackets the effective rate sits below the marginal one, which is why quoting a bracket as your tax rate overstates what you pay.

How do I get my own effective rate?

Take the state tax from your last return and divide it by the taxable income on the same return, then enter that percentage. It already reflects your deductions and credits, which makes it a better input here than a published bracket rate.

Why does the effective rate equal the flat rate for some states?

For the six verified flat-rate states (Illinois, Pennsylvania, Arizona, Michigan, Tennessee, New Hampshire), the effective rate equals the statutory rate because every dollar of taxable income is taxed at the same percentage. There are no brackets to create a difference between marginal and effective rates.

Can this calculator model a state with a graduated tax schedule?

Not directly. Graduated states are unverified in this calculator because a single flat rate cannot reproduce the effective rate of a bracket schedule. To model a graduated state, divide your actual state tax by your taxable income from last year's return and enter that effective percentage as an override.

Why does it say the rate is not verified for my state?

Because the figure the old per-state page used could not be matched to a current publication from that state's revenue department, or the state uses a graduated schedule that a single rate cannot represent. Rather than show a number with no provenance, the calculator asks you for the rate from your own notice or return and then uses exactly that.

How do I use my own rate?

Type it into the state rate field. Anything you enter wins over the built-in rate, and the result panel then labels the rate as yours rather than verified. Clearing the field goes back to the verified rate. A rate of 0 counts as blank, so to model a state with no income tax select one that has a verified 0%.

Which tax year does the state rate belong to?

The result panel prints it. Each verified rate is stored with the tax year it was published for and a link to the page it was read from, so you can check it before relying on the figure. Unverified states show neither, because there is nothing to show.

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