Connecticut Bonus Pay Tax Calculator

2026 Connecticut bonus withholding

Connecticut Bonus Pay Tax Calculator

Estimate net bonus pay, compare federal flat and aggregate supplemental wage withholding, model Connecticut income tax withholding from CT-W4 inputs, and include CT Paid Leave, FICA, FUTA, and optional employer unemployment cost.

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Bonus inputs

Use gross-to-net for a planned bonus or net-to-gross when a take-home amount was promised.

Gross bonus amount Enter the taxable bonus to be paid.

Supplemental pay type

Withholding method

Payment presentation Federal aggregate logic is required when supplemental wages are not separately stated. Connecticut withholding is estimated from the selected CT-W4 setup.

Regular wages had federal income tax withheld

The optional 22% federal flat method generally depends on regular wages having had income tax withheld in the current or prior year.

Pay frequency

Year-to-date wages before bonus Use wages already paid by this employer for Social Security, Additional Medicare, and FUTA wage-base checks.

YTD supplemental wages before bonus

Regular wages for this pay period Used for aggregate withholding comparisons and same-check Connecticut estimates.

Federal W-4 settings

Federal filing status

Use higher W-4 Step 2 checkbox tables

Annual credits from W-4 Step 3

Annual other income from W-4 Step 4(a)

Annual deductions from W-4 Step 4(b)

Extra federal withholding per regular check

Extra federal withholding on this bonus

Connecticut withholding settings

Connecticut wage allocation Use 100% when the bonus is fully subject to Connecticut withholding. Nonresidents can use the CT-W4NA work-in-Connecticut percentage.

Connecticut filing status

Form CT-W4 withholding code Use the code from the employee's current Form CT-W4. Codes A, B, C, and F use the selected filing status and annual rate schedule; Code D and missing CT-W4 handling use 6.99% as the high-withholding estimate.

YTD Connecticut wages before bonus Used for the annualized Connecticut incremental income tax estimate.

Other annual Connecticut taxable income

Extra Connecticut withholding on bonus

Connecticut withholding reduction on bonus

No valid Form CT-W4 is on file

Connecticut instructions tell employers to withhold at 6.99% when the employee does not complete Form CT-W4.

Employee claims exempt from Connecticut income tax withholding

Connecticut payroll contribution and employer-cost settings

Deduct CT Paid Leave contribution

Default uses the 2026 employee contribution rate of 0.5% up to the Social Security wage base.

YTD CT Paid Leave wages before bonus

CT employer unemployment rate Enter the employer's assigned Connecticut unemployment rate if you want it included. Default is 0 because rates are employer-specific.

CT unemployment taxable wage base Enter the current wage base from the employer's CTDOL setup when known.

YTD Connecticut UI wages before bonus

Net FUTA rate Default assumes the maximum FUTA credit is available.

Estimated net bonus

Flat supplemental method with 2026 Connecticut rules.

Net bonus $0.00 Tax withholding estimate updates as inputs change.

Gross bonus $0.00

Total withheld $0.00

Effective withholding 0.00%

Employer cost estimate $0.00

Withholding line	Amount

Method comparison

Method	Net bonus	Total withheld

What this calculator includes

Federal supplemental methods

Model the optional 22% federal flat supplemental method, the mandatory 37% excess rate above $1 million, and the aggregate method using 2026 Pub. 15-T annual percentage tables.

Connecticut withholding estimate

Estimate Connecticut income tax withholding from Form CT-W4 code, filing status, allocation percentage, missing-form handling, and the Connecticut statutory annual tax schedule.

Employee and employer payroll costs

Separate employee Social Security, Medicare, Additional Medicare, and CT Paid Leave from employer-only FICA, FUTA, and optional Connecticut unemployment cost inputs.

Connecticut bonus tax questions

Does Connecticut tax bonus pay?

Yes. Bonus pay is wages for payroll withholding purposes when it is Connecticut-source compensation or otherwise allocated to Connecticut.

Is there one flat Connecticut bonus tax rate?

No single Connecticut-only flat bonus rate was identified in the official guidance. This calculator estimates Connecticut withholding from Form CT-W4 settings and the annual tax-rate schedule, with 6.99% used for missing CT-W4 or Code D high withholding.

How do nonresident bonuses work?

Use the Connecticut allocation percentage to model wages expected to be sourced to Connecticut. Form CT-W4NA explains that nonresidents working partly inside and outside Connecticut can estimate the percentage of services performed in Connecticut.

Does employer cost reduce the employee's net bonus?

No. Employer Social Security, Medicare, FUTA, and optional Connecticut unemployment costs are shown separately so payroll teams can estimate employer cost without mixing it into employee take-home pay.

Research sources used

IRS Publication 15 for 2026 - federal supplemental wages, FICA, FUTA, and Additional Medicare Tax.
IRS Publication 15-T for 2026 - aggregate-method federal percentage tables.
Social Security Administration contribution and benefit base - 2026 Social Security wage base.
Connecticut General Statutes Chapter 229, Section 12-700 - Connecticut income tax rates and nonresident allocation rule.
Connecticut General Statutes Chapter 229, Section 12-705 - employer withholding obligation.
Connecticut Form CT-W4, Rev. 12/25 - 2026 withholding certificate, withholding codes, missing-form instruction, and bonus-change notice language.
Connecticut Form CT-W4NA, Rev. 12/25 - nonresident wage allocation guidance.
CT Paid Leave contributions - 2026 employee contribution rate and wage-base treatment.

This calculator is a planning estimate. Use official payroll software, current Form CT-W4 data, CT-W4NA allocation, assigned employer contribution rates, and professional advice for final withholding decisions.

Disclaimer: This calculator is intended strictly as a planning tool to provide a directional estimate of your Connecticut gross-to-net or net-to-gross bonus withholding based on 2026 tax schedules, including federal supplemental rates, Form CT-W4 logic, FICA, and CT Paid Leave requirements. Actual tax liabilities and final employer payroll allocations depend heavily on current year-to-date income variables, specific municipal data, and individual IRS guidelines. You should not rely on these results for compliance or binding tax planning; always consult with a certified public accountant (CPA), an outsourced legal expert, or an official company payroll department before submitting finalized financial reporting or withholding modifications.

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Disclaimer: The content provided on this webpage is for informational purposes only and is not intended to be a substitute for professional advice. While we strive to ensure the accuracy and timeliness of the information presented here, the details may change over time or vary in different jurisdictions. Therefore, we do not guarantee the completeness, reliability, or absolute accuracy of this information. The information on this page should not be used as a basis for making legal, financial, or any other key decisions. We strongly advise consulting with a qualified professional or expert in the relevant field for specific advice, guidance, or services. By using this webpage, you acknowledge that the information is offered “as is” and that we are not liable for any errors, omissions, or inaccuracies in the content, nor for any actions taken based on the information provided. We shall not be held liable for any direct, indirect, incidental, consequential, or punitive damages arising out of your access to, use of, or reliance on any content on this page.

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Connecticut Bonus Pay Tax Calculator