How Connecticut state tax withholding works
Connecticut taxes wage income, so your employer withholds Connecticut income tax from each paycheck in addition to federal tax. You tell your employer how much to withhold on Form CT-W4 (Employee's Withholding Certificate), the state’s counterpart to the federal Form W-4.
For 2026, Connecticut uses graduated tax rates. Each rate applies only to the income within its band — the single-filer schedule is:
| Rate | Taxable income over |
|---|---|
| 2% | $0 |
| 4.5% | $10,000 |
| 5.5% | $50,000 |
| 6% | $100,000 |
| 6.5% | $200,000 |
| 6.9% | $250,000 |
| 6.99% | $500,000 |
Enter your pay above to see your estimated Connecticut withholding per paycheck and per year, alongside your federal withholding and the exact W-4 entries.
Connecticut vs. federal withholding
Your Connecticut and federal withholding are figured separately. Federal withholding follows the IRS Publication 15-T tables and your Form W-4; Connecticut withholding follows the state’s own rates and your Form CT-W4. Getting one right doesn’t guarantee the other — this calculator handles both so you don’t owe a surprise bill to either the IRS or Connecticut.
Important Connecticut notes
- Connecticut uses personal-exemption and tax-recapture phase-outs in its withholding tables; this estimate applies the base exemption.
Frequently asked questions
Sources & disclaimer
Federal figures use the 2026 IRS Publication 15-T. Connecticut withholding is based on the 2026 Connecticut income-tax structure; confirm exact figures and complete Form CT-W4 at the portal.ct.gov website.
This tool provides estimates for educational purposes and is not tax advice. State withholding is modeled from the state’s income-tax rules and may differ from the exact wage-bracket tables your employer uses. Verify against your pay stub and consult a qualified tax professional before submitting your W-4 or Form CT-W4.