Connecticut Payroll Taxes and Withholding Guide (2026)

What Makes Connecticut Payroll Different

Federal payroll tax is the same in every state. What changes from one state to the next is the second layer: state income tax withholding, employer unemployment taxes, any local wage taxes, and any state social-insurance premiums. Connecticut's second layer has two moving parts: a graduated income tax with an unusual code-driven withholding method, and a 0.5 percent CT Paid Leave contribution. There is no local wage tax and no reciprocity.

The income tax is not withheld with a familiar allowance count. Instead, Form CT-W4 assigns a single letter code, and the Department of Revenue Services TPG-211 tables turn that code plus the annualized salary into an exemption, an initial tax, a 3 percent phase-out add-back, a tax recapture, and a personal tax credit. The federal baseline behind all of this is explained in the how payroll taxes work guide.

Employee Withholding Overview in Connecticut

A Connecticut employee sees federal taxes, a graduated state income tax, and a CT Paid Leave line. There is no employee unemployment line and no local wage line.

The federal lines work identically to any other state. For Social Security, the 2026 wage base is $184,500, after which Social Security stops for the year; the CT Paid Leave contribution shares that same cap. Medicare has no cap. What is unique to Connecticut is a graduated income tax withheld by CT-W4 code and the CT Paid Leave line. There is no local wage tax and no employee unemployment contribution.

How Is Connecticut State Income Tax Withheld?

Connecticut uses the Department of Revenue Services TPG-211 withholding calculation rules. There is no percentage method an employer can shortcut; the tables do the work, keyed to the Form CT-W4 withholding code. The employer annualizes wages, then applies five tables: Table A (personal exemption), Table B (initial tax), Table C (3 percent phase-out add-back), Table D (tax recapture), and Table E (personal tax credit), before dividing across pay periods. The Table B schedule for codes A, D, and F is below.

Codes B (head of household) and C (married, one earner) use wider brackets built around larger exemptions, but the top rate is 6.99 percent for every code. These are the 2025 rules, and the DRS confirms the 2026 rules and tables are unchanged, so the same schedule applies in both years. The Connecticut paycheck calculator runs the full five-table method for your code. Your final Connecticut income tax is settled on Form CT-1040. The federal Form W-4 sets federal withholding, covered in the W-4 withholding explained guide, while Form CT-W4 sets the Connecticut code.

The Form CT-W4 Withholding Codes

Connecticut does not use allowances the way most states do. Form CT-W4, Line 1, assigns a single letter code, and that one letter drives the entire calculation. Choosing the wrong code is the most common Connecticut withholding error, because it changes the exemption, the tax schedule, the phase-out, the recapture, and the credit all at once.

Two-earner married couples are the group most at risk of under-withholding. If both spouses use code A or code C, each employer withholds as if that salary were the household's only income. The fix is to move the higher earner to code D, which withholds the most. To see how each code changes take-home pay, use the Connecticut paycheck calculator.

The 3 Percent Phase-Out and Tax Recapture

Connecticut deliberately gives lower and middle incomes the benefit of its lowest bracket, then takes it back as income climbs. Two TPG-211 tables do this, and both are added to the initial tax before the personal tax credit is applied.

The practical effect is that a Connecticut paycheck withholds more as income rises than the bracket schedule alone would suggest. A worker who moves from $110,000 to $150,000, for example, sees withholding rise partly because the recapture is also stepping up, not only because of the 6 percent bracket. It is working exactly as the statute intends, but it surprises people who expect a flat marginal rate. The Connecticut paycheck calculator applies the phase-out and recapture automatically.

CT Paid Leave (CT PFML)

Connecticut Paid Leave is a state program that provides wage-replacement benefits when a worker needs time off for their own serious health condition, to bond with a new child, or to care for a family member. It is funded entirely by a 0.5 percent employee payroll contribution; employers do not contribute.

Because it follows the Social Security wage base, the contribution stops once year-to-date wages pass $184,500. The CT Paid Leave Board held the rate at 0.5 percent for 2026. It is easy to overlook when comparing a Connecticut offer against one in a no-income-tax state: on a $100,000 salary it adds $500 a year on top of the income tax. The Connecticut paycheck calculator shows the CT Paid Leave line on every result.

Connecticut Has No Income Tax Reciprocity

Some states sign reciprocal agreements so that a commuter who lives in one state and works in another pays income tax only to the home state. Connecticut has no such agreements with any state, and neither do its neighbors New York and Massachusetts.

That means a resident of another state who works in Connecticut has Connecticut income tax withheld from their pay and files a Connecticut nonresident return (Form CT-1040NR/PY), then claims a credit for the tax paid to Connecticut on their home-state return. A Connecticut resident who works in another state is taxed by Connecticut on that income too, and claims a credit for the income tax paid to the other jurisdiction so the same income is not taxed twice. There is no reciprocity certificate that stops Connecticut withholding for a cross-border commuter.

Employer Payroll Obligations in Connecticut

Connecticut employers carry the federal employer taxes plus State Unemployment Insurance through the Connecticut Department of Labor. The federal side, covered in the employer payroll tax obligations guide, includes the matching 6.2% Social Security and 1.45% Medicare plus Federal Unemployment Tax (FUTA).

The Connecticut unemployment taxable wage base rose to $27,000 per employee for 2026 (from $26,100), so the employer unemployment tax stops once an employee's year-to-date wages pass $27,000. New employers pay a 1.9% rate for 2026 before moving to an experience-rated rate; these are employer costs and are never deducted from employee pay. Note that CT Paid Leave, by contrast, is the one Connecticut payroll line that is fully employee-funded. Model the combined cost-to-hire with the employer payroll tax calculator.

Connecticut Has No Local Wage Tax

Unlike neighboring New York, where New York City and Yonkers add a local income tax, Connecticut has no municipal or county wage income tax anywhere in the state. A worker in Hartford, Bridgeport, New Haven, Stamford, or Waterbury sees the same state income tax as a worker anywhere else in Connecticut, with no city line added.

Connecticut also has no separate state disability insurance payroll deduction; the CT Paid Leave contribution is the only state social-insurance line, and there is no employee unemployment tax. So a Connecticut pay stub shows federal taxes, the state income tax, and the CT Paid Leave line, and nothing else on the state side. This matters most for workers moving to Connecticut from a state with a city tax (New York) or a separate SDI line (California, New Jersey); those lines do not exist in Connecticut.

Connecticut Supplemental Wage Withholding

Supplemental wages are payments outside regular salary: bonuses, commissions, overtime, sales awards, and back pay. Connecticut does not publish a separate flat supplemental withholding rate; the TPG-211 rules note supplemental compensation is handled under Circular CT guidance.

• Calculation-rules or wage-bracket method: Connecticut withholds supplemental wages using its regular calculation rules or wage-bracket tables for the employee's CT-W4 code, rather than a distinct flat rate.
• Aggregate method: if the supplemental payment is combined with regular wages and not listed separately, the employer runs the combined amount through the regular tables.
• Local wage tax: none, on supplemental wages or regular wages.
• CT Paid Leave: the 0.5 percent contribution still applies to supplemental wages up to the wage cap.

Federal income tax withholding on supplemental wages is a separate calculation set by the IRS, often the 22% federal flat supplemental rate, and Social Security and Medicare still apply under their own rules. For the federal supplemental math, use the Bonus Tax Calculator.

Connecticut Filing and Payment Frequency

Connecticut employers remit withheld state income tax on a schedule set by the Department of Revenue Services based on prior-year withholding: weekly, monthly, or quarterly. Returns and payments are filed electronically through the myconneCT system, with Form CT-941 for quarterly reconciliation and Form CT-W3 for annual reconciliation. The TPG-211 withholding tables and the deposit schedule come from the DRS; the federal deposit schedule is covered separately in the payroll tax deadlines guide.

Unemployment tax is reported and paid separately from income tax withholding, quarterly through the Connecticut Department of Labor. CT Paid Leave contributions are remitted quarterly to the CT Paid Leave Authority. New employees must be reported to the Connecticut new-hire reporting center within 20 days of the hire date.

How Take-Home Pay Works in Connecticut

The calculation sequence runs from gross pay down to net pay. Because Connecticut income tax begins with federal wages, the same pre-tax deductions that reduce federal wages also reduce the Connecticut state base; CT Paid Leave, however, is figured on gross wages.

1. Start with gross wages for the pay period.
2. Subtract federal pre-tax deductions (401(k), Section 125 health premiums) to find taxable wages for federal and Connecticut state tax.
3. Apply federal income tax withholding using the Form W-4 and IRS Publication 15-T.
4. Annualize wages and run the TPG-211 tables for your CT-W4 code (exemption, initial tax, phase-out add-back, recapture, personal tax credit), then divide across pay periods.
5. Subtract Social Security (6.2%), Medicare (1.45%), and CT Paid Leave (0.5%) on the capped wage. The remainder is net pay; there is no employee unemployment line and no local wage line.

To see exact figures for a specific salary, CT-W4 code, and pay frequency, use the Connecticut paycheck calculator or the general take-home pay calculator for a full pre-tax benefits stack.

Connecticut Payroll Quick Facts (2026)

Frequently Asked Questions