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How Bonuses Are Taxed in Connecticut (2026)
A bonus paid on a separate check in Connecticut has a flat 22% federal tax withheld (37% on cumulative supplemental wages over $1,000,000 in a year), 7.65% FICA, and Connecticut state income tax at your marginal rate. Withholding is not a higher tax rate — it is just how much your employer holds back up front; your actual tax on the bonus is settled when you file, and any over-withholding comes back as refund.
| Component | Rate on the bonus |
|---|---|
| Federal income tax (supplemental, percentage method) | 22% flat · 37% above $1,000,000/yr |
| Social Security | 6.2% (up to $184,500 of total wages) |
| Medicare | 1.45% · +0.9% above $200,000 |
| Connecticut state tax | Your marginal bracket rate |
Some employers instead use the aggregate method — adding the bonus to your regular paycheck and withholding as if that were every check — which can withhold more or less than the flat 22%. The calculator above uses the flat-rate (percentage) method.
Connecticut Bonus Take-Home by Amount (2026)
Flat-rate (percentage) method, single filer, bonus paid separately on top of a $65,000 salary. Enter your own numbers in the calculator above — this table is a starting point.
| Bonus | Federal (22%) | FICA | Connecticut tax | Take-home |
|---|---|---|---|---|
| $1,000 | $220 | $77 | $55 | $649 |
| $2,500 | $550 | $191 | $138 | $1,621 |
| $5,000 | $1,100 | $383 | $275 | $3,243 |
| $10,000 | $2,200 | $765 | $550 | $6,485 |
| $15,000 | $3,300 | $1,148 | $825 | $9,728 |
| $25,000 | $5,500 | $1,913 | $1,375 | $16,213 |
How Connecticut Paycheck Tax Is Calculated (2026)
Source: Connecticut Department of Revenue Services| Taxable income bracket | Rate |
|---|---|
| $0 – $10,000 | 2% |
| $10,000 – $50,000 | 4.50% |
| $50,000 – $100,000 | 5.50% |
| $100,000 – $200,000 | 6% |
| $200,000 – $250,000 | 6.50% |
| $250,000 – $500,000 | 6.90% |
| $500,000 – + | 6.99% |
Federal Tax & FICA (shared across all states)
| Filing status | Standard deduction |
|---|---|
| Single | $16,100 |
| Married Filing Jointly | $32,200 |
| Head of Household | $24,150 |
| Federal brackets (all filing statuses) | 10% / 12% / 22% / 24% / 32% / 35% / 37% |
|---|---|
| Social Security | 6.2% up to $184,500 wage base |
| Medicare | 1.45% on all wages, +0.9% above $200,000 single/HoH, $250,000 MFJ |
⚠️ Connecticut's married-filing-jointly and head-of-household state brackets have not yet been independently verified against the primary source above — this calculator uses Connecticut's single-filer brackets as an estimate when those statuses are selected.
Guideline version 2026-CT-v1 · Last verified 2026-07-26
Connecticut Bonus Tax FAQ
How much are bonuses taxed in CT?
A separate Connecticut bonus has 22% federal supplemental tax withheld (37% above $1,000,000/year), 7.65% FICA, and Connecticut income tax at your marginal bracket (2.00% to 6.99%). Connecticut does not use a flat supplemental rate, so bonus state withholding follows your regular bracket.
What is the Connecticut bonus tax rate?
Federal flat 22% + Connecticut 2.00%-6.99% (marginal) + Social Security 6.2% + Medicare 1.45%. A mid-income earner's $5,000 bonus loses about $1,100 federal, ~$250 Connecticut, and $383 FICA.
Why is Connecticut state tax on my bonus an estimate?
Connecticut has no published supplemental withholding rate, so this calculator estimates the state tax on the bonus as the extra tax your marginal bracket produces on the added income. Your employer's actual method (percentage or aggregate) may differ slightly.
Methodology & Source
Connecticut state tax figures sourced from Connecticut Department of Revenue Services (https://portal.ct.gov/drs), citing Conn. Gen. Stat. § 12-700. Federal brackets, standard deductions (single/MFJ/HoH), and FICA constants sourced from the IRS (Revenue Procedure 2025-32; married-filing-jointly Additional Medicare threshold of $250,000 is a separate, unindexed statutory figure). Connecticut's married-filing-jointly and head-of-household figures are not yet independently verified and currently fall back to single-filer brackets — see the caveat in the formula section above.
Bonus federal withholding uses the flat supplemental-wage rate (22%, 37% above $1,000,000 cumulative supplemental wages/year), per IRS Publication 15 (Circular E), Employer's Tax Guide, 2026 edition — the alternative "aggregate method" is not modeled. Connecticut publishes no separate supplemental withholding rate, so the calculator estimates the state tax on the bonus from your marginal bracket.
This is an estimate based on standard single-filer federal, FICA, and CT state calculations. Actual withholding may differ based on your W-4 elections, pre-tax deductions, and other factors. Connecticut's $15,000 personal exemption phases out between $30,000 and $45,000 of income; this estimate applies it as a flat amount, which understates tax for filers in that phase-out band. Connecticut also has a "tax recapture" provision affecting high earners, not modeled.
Guideline version: 2026-CT-v1 · Effective: 2026-01-01 · Last verified: 2026-07-26