In recent years, more states have adopted a single income tax rate, or “flat tax.” Unlike progressive systems, where tax rates rise as income increases, a flat tax applies the same rate to all taxable income.
Flat taxes could make certain places more appealing for those looking to keep more of their paycheck. That’s likely something people are thinking about as tax season wraps up.
Supporters say flat taxes are easier to understand and plan for and could make some states more competitive. (That could be helpful as people leave high-tax states like California and New York for states with lower tax rates.)
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But critics warn that flat tax rates often benefit higher-income households more than those with middle or lower income.
So the big question is: who really pays more when every dollar is taxed at the same rate? Here’s more of what you need to know.
Which states have flat tax rates in 2026
As of this year, more than a dozen states levy a flat income tax. Ohio is the newest addition at 2.75% as of January 1, 2026. (The flat rate applies to income above ~$26,050; income below that is still untaxed.)
The following table shows states that have made the shift in recent years.
|
State |
2026 Rate |
Prior Top Rate |
|---|---|---|
|
Arizona |
2.5% |
4.5% |
|
Georgia |
4.99%, (just changed part of a phased reduction) |
5.75% |
|
Idaho |
5.3% |
7.4% |
|
Iowa |
3.8% |
8.53% |
|
North Carolina |
3.99% |
5.25% |
|
Ohio |
2.75% |
4.8% |
|
Mississippi |
4.0% |
0–5% bracketed |
Note: Mississippi exempts lower income from taxes, then applies a flat rate to the rest, which is why it’s often grouped with flat-tax states.
Here are the states that have had flat rates for a long time.
|
State |
2026 Rate |
Header Cell – Column 2 |
|---|---|---|
|
Colorado |
4.40% |
Row 0 – Cell 2 |
|
Illinois |
4.95% |
Row 1 – Cell 2 |
|
Indiana |
2.95% |
Row 2 – Cell 2 |
|
Kentucky |
4.00% |
Row 3 – Cell 2 |
|
Michigan |
4.25% |
Row 4 – Cell 2 |
|
Pennsylvania |
3.07% |
Row 5 – Cell 2 |
|
Utah |
4.5% |
Row 6 – Cell 2 |
|
Wyoming |
0% |
Row 7 – Cell 2 |
Note: Massachusetts taxes most income at a flat rate, with a 4% surtax on income over $1 million.
Even at $75,000 in taxable income, the difference between low- and high-rate flat-tax states exceeds $2,000 a year, and it widens at higher incomes.
Flat tax benefits and drawbacks: Who really pays?
Not everyone is a fan of flat taxes.
Critics argue that treating a $50,000 earner the same as someone making $500,000 feels unfair — higher-income households benefit far more, while residents with middle or lower incomes see little relief.
- For example, in a state with a flat tax of 3.99%, someone earning $50,000 would be left with about $48,000 after tax.
- Meanwhile, a $500,000 earner in that same state would keep about $480,000.
- That’s over $430,000 more in take-home pay, largely reflecting the difference in income, even though both pay the same rate
Note: This is a simplified example. It assumes gross income equals taxable income and doesn’t account for tax deductions, exemptions, credits, or federal taxes.
Another argument against flat tax rates is the challenges sometimes created for state budgets. Lower income tax revenue can push lawmakers to adjust or increase other state levies, like sales taxes and property taxes.
- North Carolina‘s flat tax has been in place since 2014, now has a 2026 rate at 3.99%, and has funded priorities amid growth, though ongoing revenue gaps fuel debates over sales and property hikes.
- Iowa’s 2025 flat tax at 3.8% promised simplification and growth for all earners. But some critics projected annual revenue losses of more than $1 billion, raising concerns that lawmakers could turn to higher sales or property taxes to offset the shortfall. Data show those kinds of taxes tend to disproportionately burden middle- and lower-income households.
Similar debates have occurred in other states, with proponents highlighting economic growth and competitiveness, and opponents warning that reduced progressivity can strain funding for essential services.
Understanding these trade-offs is important if you’re considering moving to a different state. A lower income tax may look attractive, but other forms of taxation or reduced services and the overall cost of living can sometimes offset the benefit.
Flat tax examples: What does it mean for your money?
Flat taxes can generally increase take-home pay for some earners, but everyday pressures like rising housing costs, groceries, gas taxes, and energy bills often eat into that extra cash. That can make the net benefit feel smaller than the numbers suggest.
If You’re Middle-Class
The savings could be tangible but modest.
- At $75,000 in taxable income, someone living in Arizona would pay about $1,875 in taxes, compared with roughly $3,975 in Idaho.
- That’s a difference of $2,100 a year.
If You’re a Higher Earner
The picture shifts at higher incomes.
- At $150,000, a taxpayer in Arizona might owe $3,750, while someone in Idaho could pay roughly $7,950.
- That’s over $4,000 in potential savings, enough to cover several months of groceries, a mortgage payment, or climbing energy costs.
*These are simplified examples that don’t account for federal taxes or other credits, deductions and the like.
The income gap is why some argue that flat taxes tend to favor higher earners. While everyone pays the same tax rate, those with larger incomes see the biggest real-dollar savings.
In the end, whether a flat tax actually affects your finances depends heavily on your income and where you live.
Flat tax rates: Bottom line
If you’re considering relocating, taxes are only one piece of the puzzle. A state that looks tax-friendly because of a flat income tax (or even no personal income tax) might not necessarily translate to more money in your pocket.
Understanding the full picture — income tax, other taxes, and cost of living — can help give you a clearer sense of which states truly help you keep more of what you earn.