AfterTaxLabState income tax explained: three ways states tax wages
State income taxes represent a mandatory deduction calculated based on where you earn your living. Unlike federal obligations that apply uniformly across the country, state-level requirements fluctuate significantly depending on local legislation and specific regional residency rules. Every time an employer processes a payroll cycle, these state mandates dictate the exact portion of your gross earnings that must be withheld before the remainder is deposited into your bank account.
The variance between state tax policies explains why two employees earning identical gross salaries often report vastly different net incomes. State governments utilize these revenue streams to fund public infrastructure, education, and social services. When reviewing a payslip, the line item labeled as state tax reflects the specific legislative framework of your primary state of residence, acting as a direct reflection of the local tax regime governing your employment earnings.
The same $100,000 salary across state tax regimes
Single filer, no pre-tax contributions. Only the state line changes — federal tax and FICA are identical.
| State | Wage tax treatment | State income tax | Take-home |
|---|---|---|---|
| Texas | no wage tax | $0 | $79,180 |
| Florida | no wage tax | $0 | $79,180 |
| Washington | no wage tax | $0 | $79,180 |
| Utah | flat 4.55% | $4,550 | $74,630 |
| Illinois | flat 4.95% | $4,950 | $74,230 |
| California | progressive (simplified 2026) | $5,344 | $73,836 |
| New York | progressive (simplified 2026) | $4,952 | $74,228 |
Three shapes of state tax
State tax regimes generally follow one of three models: no tax, flat rates, or progressive brackets. States like Texas, Florida and Washington currently impose no wage tax, allowing workers to retain their full earnings. Conversely, flat-rate systems apply a single percentage to all income levels regardless of total earnings. For example, Utah uses this straightforward approach to collect $4,550 from a $100,000 salary. These distinct models determine how the tax burden is distributed across the workforce, directly shifting the amount of money that remains in your pocket after accounting for state-level financial obligations.
The same salary, different states
The structure of state taxation causes significant net pay fluctuations even when gross salaries remain constant. Under a progressive system, tax rates increase as earnings rise, creating different outcomes compared to flat-rate states. For a $100,000 salary, California takes $5,344 from a worker's check, while New York takes $4,952. These figures demonstrate that residency is a primary factor in calculating total yearly compensation. By comparing these amounts, you can see how specific legislative choices in each state create unique financial profiles for workers who earn the exact same gross annual salary.
What the state line does not include
While state income tax is a primary deduction, the calculations shown here are limited to statewide levies. The engine models city, county and local taxes only where a note says so, and never adds them to the state line. This distinction is vital because local municipalities often impose additional payroll taxes that operate independently of state systems. Consequently, your actual take-home pay might be lower than the amount calculated on a purely statewide basis if your specific jurisdiction mandates supplementary local contributions that are not captured in the general state tax field.
State income tax explained: common questions
Why do some states charge no income tax?
States like Texas, Florida and Washington choose to fund their operations through other revenue sources, such as sales or property taxes, rather than taxing personal wages. In these states, a $100,000 salary keeps $79,180. This policy choice eliminates the need for a state income tax line item on your regular paycheck.
What is the difference between a flat rate and a progressive tax?
A flat rate applies the same percentage to every dollar earned, while a progressive system uses brackets that increase as you earn more. For instance, Utah applies a flat percentage, resulting in $4,550 withheld from a $100,000 salary. Progressive systems, like those used in California, adjust the total tax based on higher income tiers.
Does the calculator include local city taxes?
The engine models city, county and local taxes only where a note says so, and never adds them to the state line. If your specific city charges an extra tax, that amount is excluded from the standard state tax calculations provided in the interface. Always check your local jurisdiction for additional mandatory payroll deductions.
How does my state of residence affect my net pay?
Your state of residence determines which tax regime applies to your wages. Because California takes $5,344 and New York $4,952 of the same pay, your net income changes based on where you work. Different states prioritize various funding models, which directly impacts the final amount of money you take home each cycle.
Figures calculated with the AfterTaxLab 2026 engine: federal brackets and standard deduction ($16,100 single), Social Security wage base $184,500, published 2026 state rates. Estimates for planning only — not tax advice. Last verified 21 Sep 2026 · methodology.