1South Dakota
Lowest17.9%
Overall effective tax rate
- Net
- Federal
- State
- FICA
- Federal income tax
- $7,670
- State income tax
- $0
- Payroll tax (FICA)
- $5,738
- Total tax
- $13,408
- Net income (annual)
- $61,593
Tax year 2026 · state vs state
Connecticut vs South Dakota Income Tax Comparison (2026)
On a $75,000 salary (single filer, 2026), you pay $2,550 less state income tax a year in South Dakota than in Connecticut, which is about $213 a month. At $150,000 the gap is $6,850 in favor of South Dakota.
Connecticut: up to 6.99%South Dakota: no state taxUpdated October 10, 2026
Compare Connecticut and South Dakota for your income
Estimate for education only, not tax advice. 2026 federal and state rules, standard deductions, no local taxes. How we calculate.
State comparison
Comparing 2 states, sorted by lowest overall tax rate.
2Connecticut
21.3%
Overall effective tax rate
- Net
- Federal
- State
- FICA
- Federal income tax
- $7,670
- State income tax
- $2,550
- Payroll tax (FICA)
- $5,738
- Total tax
- $15,958
- Net income (annual)
- $59,043
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💰 Monthly breakdown
Your take-home pay, spread across the year
South Dakota
Monthly gross$6,250
Monthly tax$1,117
Monthly take-home$5,133
Connecticut
Monthly gross$6,250
Monthly tax$1,330
Monthly take-home$4,920
Estimates use 2026 federal and state rates, the standard deduction for your filing status and no local taxes. Rankings use state income tax only.
Connecticut vs South Dakota: how the two systems differ
| Connecticut | South Dakota | |
|---|---|---|
| Wage income tax | Progressive, 7 brackets | No tax on wages |
| Top rate | 6.99% | 0% |
| Lowest rate | 2% | 0% |
| Deductions and credits (single) | $15,000 personal exemption | Not applicable |
State income tax and take-home pay at every salary
The same salary can leave you with different take-home pay depending on the state. This table applies each state’s 2026 rules to a single filer with no pre-tax contributions.
| Income | CT state tax | SD state tax | Difference | CT take-home | SD take-home |
|---|---|---|---|---|---|
| $30,000 | $425 | $0 | $425 less in South Dakota | $25,860 | $26,285 |
| $40,000 | $875 | $0 | $875 less in South Dakota | $33,445 | $34,320 |
| $50,000 | $1,325 | $0 | $1,325 less in South Dakota | $41,030 | $42,355 |
| $60,000 | $1,775 | $0 | $1,775 less in South Dakota | $48,615 | $50,390 |
| $75,000 | $2,550 | $0 | $2,550 less in South Dakota | $59,043 | $61,593 |
| $100,000 | $3,925 | $0 | $3,925 less in South Dakota | $75,255 | $79,180 |
| $150,000 | $6,850 | $0 | $6,850 less in South Dakota | $106,941 | $113,791 |
| $250,000 | $13,025 | $0 | $13,025 less in South Dakota | $170,157 | $183,182 |
Single filer, 2026, federal standard deduction. Take-home is after federal, state and payroll tax. No local taxes.
Married filing jointly
| Income | CT state tax | SD state tax | Difference | CT take-home | SD take-home |
|---|---|---|---|---|---|
| $75,000 | $1,795 | $0 | $1,795 less in South Dakota | $62,828 | $64,623 |
| $100,000 | $2,920 | $0 | $2,920 less in South Dakota | $81,790 | $84,710 |
| $150,000 | $5,430 | $0 | $5,430 less in South Dakota | $117,755 | $123,185 |
| $250,000 | $11,060 | $0 | $11,060 less in South Dakota | $186,408 | $197,468 |
Married filing jointly, 2026, federal standard deduction. Uses each state's joint brackets where they differ.
Does the lower-tax state change as income rises?
For a single filer, Connecticut and South Dakota charge the same state income tax (nothing) up to roughly $17,500 of income. Above that, South Dakota is the lower-tax state.
Rates side by side
Connecticut (single filers)
| 2% | Up to $10,000 |
| 4.5% | $10,001 to $50,000 |
| 5.5% | $50,001 to $100,000 |
| 6% | $100,001 to $200,000 |
| 6.5% | $200,001 to $250,000 |
| 6.9% | $250,001 to $500,000 |
| 6.99% | Over $500,000 |
South Dakota (single filers)
South Dakota has no state personal income tax. State revenue comes mainly from sales tax.
Full details for each state: Connecticut income tax calculator and South Dakota income tax calculator. Federal rates are on the 2026 federal tax brackets page.
Connecticut vs South Dakota FAQ
Which has lower income tax, Connecticut or South Dakota?+
South Dakota is lower at $75,000: $0 of state income tax versus $2,550 in Connecticut. At $150,000 it is $6,850 in Connecticut and $0 in South Dakota. For a single filer, Connecticut and South Dakota charge the same state income tax (nothing) up to roughly $17,500 of income. Above that, South Dakota is the lower-tax state.
How much more do I keep on $100,000 in Connecticut versus South Dakota?+
A single filer keeping $75,255 a year in Connecticut would keep $79,180 in South Dakota after federal, state and payroll tax. The difference is $3,925 a year, or $327 a month.
How do the Connecticut and South Dakota income tax systems differ?+
Connecticut uses progressive rates up to 6.99%; South Dakota has no tax on wages.
Are local taxes included in this Connecticut vs South Dakota comparison?+
No. It covers federal income tax, Social Security, Medicare and state income tax only. City, county, sales and property taxes are not included, and they can change the real cost of living in each state.
Should I move from Connecticut to South Dakota to save on taxes?+
State income tax is one cost among many. Property and sales taxes, housing, insurance and wages also differ, and you may owe tax to both states in the year you move. Use this comparison as one input and confirm details with a tax professional.
Sources
- Tax Foundation: 2026 state individual income tax rates and brackets
- IRS: Tax inflation adjustments for tax year 2026
Last checked October 10, 2026. Confirm with your state tax agency before filing.
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Estimates for education only, not tax, legal or financial advice. Not a substitute for a tax professional or your state revenue department.