2026 tax year · Connecticut
Marketplace seller taxes in Connecticut
Etsy, eBay, Shopify and the rest report your gross and withhold nothing. The gap between that and what you are taxed on is your costs, in Connecticut that gap is worth $7,057 in tax.
Take a driver who grossed $45,000 over 18,000 business miles. After mileage at 74.3 cents and the rest of the stack, worked through on the marketplace seller page $26,775 comes off and $18,225 is left as taxable profit. That profit is what Connecticut and the IRS charge against.
What that leaves you owing in Connecticut
Connecticut uses graduated 2026 income tax brackets topping out at 6.9%, across 7 brackets, on top of federal income tax and self-employment tax.
| Self-employment tax | $2,575 |
| Federal income tax | $67 |
| Connecticut income tax | $512 |
| Total tax | $3,154 |
| Effective rate on gross | 7.0% |
Earning more in Connecticut
A single filer taking the standard deduction, this work as the only income, the calculator above handles the other filing statuses. Miles rise with earnings, so the deduction rises too, and the effective rate on gross climbs more slowly than it would for someone whose income grew without expenses attached:
| Volume | Gross | Mileage off | Taxable profit | Connecticut tax | Total tax | Rate on gross |
|---|---|---|---|---|---|---|
| Part-time | $15,000 | $0 | $15,000 | $377 | $2,497 | 16.6% |
| Steady side income | $45,000 | $0 | $45,000 | $1,632 | $10,211 | 22.7% |
| Full-time | $72,000 | $0 | $72,000 | $2,930 | $17,734 | 24.6% |
Connecticut specifics that change the number
Connecticut is one of the twelve states that still taxes Social Security benefits, which matters if you are drawing benefits alongside self-employment income.
Selling into and out of Connecticut
Income tax follows you: Connecticut taxes your profit wherever the buyer was. Sales tax does not. Marketplace facilitator laws make the platform collect and remit sales tax on your behalf in most states, which is why a seller can have customers in all fifty and still file only one income tax return. Selling off-platform is where that stops being true.
On $18,225 of profit, what the states around Connecticut would charge:
| State | Its tax | vs Connecticut |
|---|---|---|
| Rhode Island | $683 | +$113 |
| New York | $734 | +$164 |
| Massachusetts | $911 | +$341 |
- Rhode Island would take $113 more, $683 against Connecticut's $570.
- New York would take $164 more, $734 against Connecticut's $570.
- Massachusetts would take $341 more, $911 against Connecticut's $570.
Marketplace seller tax questions in Connecticut
How much should a Connecticut seller set aside?
About 7.0% of gross on the $45,000 example, $3,154 across self-employment tax, federal income tax and $512 to Connecticut. In practice that means moving about $70 of every $1,000 payout into a separate account the day it lands, and sending roughly $789 to the IRS each quarter, no platform withholds any of this for you. Set aside from each payout rather than finding it in April.
Does the $45,000 on my 1099-NEC match what Connecticut taxes?
No. Connecticut taxes profit, not gross. After $26,775 of deductions the taxable figure is $18,225, so the Connecticut bill is $512 rather than what gross alone would suggest. The form reports what the platform paid out, it knows nothing about your costs, and no one subtracts them for you. On this example 60% of the gross never becomes taxable income, but only for the seller who kept the records to prove it.