Iowa vs South Carolina Taxes
Compare the total tax burden between Iowa (3.8% flat) and South Carolina (1.99% – 5.21%). Enter your income to see which state saves you more.
| Tax Component | Iowa | South Carolina |
|---|---|---|
| Federal Tax | $13,170 | $13,170 |
| State Tax | $3,148 | $3,405 |
| FICA | $7,650 | $7,650 |
| Total Tax | $23,968 | $24,225 |
| Take-Home | $76,032 | $75,775 |
| Effective Rate | 23.97% | 24.23% |
| Annual Difference | $257 less | $257 more |
The $257 difference is primarily because South Carolina has a progressive income tax with rates up to 6.0%, while Iowa has a flat 3.8% income tax. At your income level, South Carolina's marginal rate is 5.2% vs Iowa's 3.8%.
Why the difference
You'd pay $257/year ($21/month) more in South Carolina vs Iowa.
Tax structure
Iowa has a flat 3.8% state income tax, while South Carolina uses progressive brackets up to 6.0%.
Effective rate at your income
At $100,000, Iowa's effective state rate is 3.1% vs 3.4% in South Carolina — a 0.3 percentage point gap.
Tip: With a flat tax rate, your effective state rate is predictable and consistent. Focus tax reduction on pre-tax contributions (401k, HSA) and any state-specific deductions or credits available.
Tip: In a progressive-bracket state, pre-tax 401(k) and HSA contributions reduce your state tax bill along with federal tax. If you are near a bracket boundary, an additional contribution can drop you into a lower state bracket.
Iowa Total Tax
$23,96823.97% effective rate
South Carolina Total Tax
$24,22524.23% effective rate
Annual Savings
$257by living in Iowa
Tax at Different Income Levels
| Income | Iowa Total Tax | South Carolina Total Tax | Annual Savings |
|---|---|---|---|
| $75,000 | $15,606 | $15,510 | Save $96 |
| $100,000 | $23,968 | $24,225 | +$257 |
| $150,000 | $41,257 | $42,219 | +$962 |
| $200,000 | $58,021 | $59,688 | +$1,667 |
Based on single filer, standard deduction, 2026 tax year. Includes federal income tax, state income tax, and FICA.
Why the difference
You'd pay $257/year ($21/month) more in South Carolina vs Iowa.
Tax structure
Iowa has a flat 3.8% state income tax, while South Carolina uses progressive brackets up to 6.0%.
Effective rate at your income
At $100,000, Iowa's effective state rate is 3.1% vs 3.4% in South Carolina — a 0.3 percentage point gap.
Tip: With a flat tax rate, your effective state rate is predictable and consistent. Focus tax reduction on pre-tax contributions (401k, HSA) and any state-specific deductions or credits available.
Tip: In a progressive-bracket state, pre-tax 401(k) and HSA contributions reduce your state tax bill along with federal tax. If you are near a bracket boundary, an additional contribution can drop you into a lower state bracket.
Understanding Each State
Iowa
This state uses a flat income tax rate, meaning the same percentage applies to all taxable income regardless of how much you earn. This simplifies tax planning but means there is no bracket benefit for lower earners. The effective rate is very close to the headline rate after deductions.
Tip: With a flat tax rate, your effective state rate is predictable and consistent. Focus tax reduction on pre-tax contributions (401k, HSA) and any state-specific deductions or credits available.
South Carolina
This state uses a progressive income tax system with multiple brackets, similar to the federal system. Only the income within each bracket is taxed at that rate, so your effective state rate is lower than the top bracket. Tax planning strategies include maximizing pre-tax retirement contributions to reduce state-taxable income.
Tip: In a progressive-bracket state, pre-tax 401(k) and HSA contributions reduce your state tax bill along with federal tax. If you are near a bracket boundary, an additional contribution can drop you into a lower state bracket.
Key Comparison Points
Income tax structure: Iowa has a flat income tax (3.8% flat), while South Carolina has a progressive income tax (1.99% – 5.21%).
Beyond income tax: State tax comparisons should also consider property tax rates, sales tax, and cost of living. A state with no income tax may have higher property or sales taxes that offset the savings.
SALT deduction cap: Under OBBBA, the 2026 federal SALT cap is $40,400, phasing out above $505,000 MAGI toward a $10,000 floor. This limits the federal tax benefit of living in a high-tax state, so the gross state tax difference remains close to the net difference for most earners — especially high earners inside the phaseout.
Frequently asked questions
Is it cheaper to live in Iowa or South Carolina?
Based on income tax alone, Iowa has a lower tax burden. At $100K income, you'd save $257 annually in Iowa compared to South Carolina. However, total cost of living also depends on property taxes, sales taxes, and housing costs.
How much would I save moving from South Carolina to Iowa?
A single filer earning $100,000 would save approximately $257 per year in total taxes by living in Iowa instead of South Carolina. At $150,000 income, the savings change to $962 per year.
What is the income tax rate in Iowa?
Iowa has a flat income tax with rates of 3.8% flat.
What is the income tax rate in South Carolina?
South Carolina has a progressive income tax with rates of 1.99% – 5.21%.