Connecticut Payroll Taxes: 2026 Employer Guide
Quick Facts
Key payroll tax details at a glance.
State Income Tax
Progressive (up to 6.99%)
SUI New Employer Rate
1.9%
SUI Wage Base
$27,000 per employee
SUI Rate Range
1.10% to 9.90%
Employee SUI Contribution
No
Local Taxes
No
Overview: Connecticut Payroll Landscape
Connecticut's payroll environment falls in the moderate complexity range. The state has a progressive income tax with seven brackets and a top rate of 6.99%, plus a paid leave program that requires employee withholding.
This guide breaks down each of Connecticut's employer obligations: registration requirements, 2026 tax rates and wage bases, filing deadlines, and the compliance pitfalls that catch expanding startups off guard.
Connecticut State Income Tax
Withholding rates, brackets, and forms.
Tax Type
Progressive
Top Rate
6.99%
Withholding Form
CT-W4
Connecticut Unemployment Insurance (SUI)
Employer rates, wage bases, and contribution details.
New Employer Rate
1.9%
Wage Base
$27,000 per employee
Rate Range
1.10% to 9.90%
Employee Contribution
—
What is Connecticut SUI? Connecticut SUI (State Unemployment Insurance) is an employer-paid tax that funds unemployment benefits for workers who lose their jobs. It is administered by the Connecticut Department of Labor. Registration: Employers must register with the Connecticut Department of Labor as soon as they hire their first Connecticut employee.
Connecticut Additional Employer Taxes
Other state-mandated payroll contributions.
CT Paid Leave
0.5%
CT Paid Leave Employers with one or more employees must participate. The 0.5% is withheld from employee wages unless the employer chooses to pay it.
Connecticut Compliance Checklist
Deadlines, filing requirements, and official resources.
Key Deadlines
Withholding deposits
Due Varies by liability
Quarterly returns (Q1)
Due April 30
Quarterly returns (Q2)
Due July 31
Quarterly returns (Q3)
Due October 31
Quarterly returns (Q4)
Due January 31
Annual reconciliation
Due January 31
W-2 state copies
Due January 31
New hire report
Due Within 20 days of start date
How Warp Handles Connecticut Payroll
Warp is the only AI-native HR & Payroll platform built for ambitious companies. Instead of clicking through clunky dashboards or Connecticut's .gov websites for taxes, Warp's AI agents open your Connecticut tax accounts, file every payroll form, and resolve every tax notice automatically.
What Warp handles for Connecticut employers:
- Connecticut tax account registration and setup
- Automated income tax withholding calculations and deposits
- SUI registration and quarterly filings
- CT Paid Leave setup and remittance
- Annual W-2 and reconciliation filing
- Tax notice resolution directly with Connecticut agencies, so you never spend hours on hold
Every Warp customer gets a dedicated Account Manager and Benefits Advisor included to guide them through payroll setup, multi-state expansion, and benefits selection. You'll never visit a government website, negotiate with tax agencies, or pay an accountant $150 per quarterly filing.
If you don't want to deal with navigating Connecticut .gov portals, check out a demo of Warp to see how we can help you stop worrying about compliance and get back to building.
Tax data last verified: March 12, 2026