Connecticut Bonus Tax Calculator
Data compiled and maintained by Edmond Daher · Updated 2026-06-16
That big bite out of a Connecticut bonus is withholding at work — a prepayment, not a special bonus tax. Connecticut has no separate bonus rate, so it withholds using the aggregate method on top of the 22% federal prepayment and FICA. Drop your figures in to watch the payday deduction sit next to the real filing cost, plus whatever you get back or owe. Everything runs in your browser.
The quick take: a stand-alone Connecticut bonus has a flat 22% federal tax withheld, no separate Connecticut rate — it's withheld as ordinary wages, plus 7.65% FICA. But that's only withholding. Your real bill is your marginal rate at filing; run the calculator to see the refund or shortfall.
Estimate only, not tax advice — terms.
Run the numbers on a $24,000 bonus for a $115,000 earner in Connecticut
Here's how a $24,000 bonus plays out for a single filer making $115,000 in Connecticut:
- On the check: the employer holds back $5,280 for federal, $1,440 Connecticut, and $1,836 for FICA — $8,556 in all (35.6% of the bonus), leaving about $15,444.
- The real bill: at filing the bonus is taxed roughly $7,064 in income tax (federal $5,624 + Connecticut $1,440), with the identical $1,836 FICA on top.
- The gap: you'll owe about $344 more at filing, because your real rate beats the 22% withheld. FICA ($1,836) stays either way — it's a real tax.
Illustrative single-filer figures from this page's engine; your result depends on your total income and filing status.
Connecticut bonus withholding across three bonus sizes
Here's the Connecticut bite on a $5,000, $25,000, and $100,000 bonus (single filer, $70,000 salary):
| Bonus | Federal | Connecticut | FICA | Total | % of bonus |
|---|---|---|---|---|---|
| $5,000 | $1,100 | $275 | $383 | $1,758 | 35.1% |
| $25,000 | $5,500 | $1,375 | $1,913 | $8,788 | 35.1% |
| $100,000 | $22,000 | $5,850 | $7,650 | $35,500 | 35.5% |
The % shifts as Social Security stops at the wage base; the income-tax portion still trues up when you file.
Why your Connecticut bonus looks over-taxed — and mostly isn't
Nothing about a bonus changes the tax rate — it changes the withholding. The bonus is stacked onto your other income and taxed at your marginal rate, not at a bonus-only rate. Most people's real rate is under 22%, so the extra returns; higher earners above 22% owe more. In this page's $24,000 example, withholding falls about $344 short of the real tax, so you'd owe the rest. Set aside the 7.65% FICA — that part is owed for good and never refunds.
Cross-border check: Connecticut vs. New York, Massachusetts and Rhode Island on a bonus
Here's a $10,000 bonus on a $70,000 salary compared across Connecticut and nearby New York, Massachusetts and Rhode Island:
| State | Bonus method | State withheld | Total withheld |
|---|---|---|---|
| Connecticut | aggregate method | $550 | $3,515 |
| New York | flat 11.7% | $1,170 | $4,135 |
| Massachusetts | aggregate method | $500 | $3,465 |
| Rhode Island | flat 5.99% | $599 | $3,564 |
Figures are the 22% federal plus state plus FICA for a single filer; the income tax you owe reconciles on your return.
What comes out of a Connecticut bonus in 2026
Federal withholding on a bonus. The IRS default holds back a flat 22% for federal income tax when the bonus is separate from your regular pay (IRS Pub 15). Bonus dollars over $1,000,000 in the year switch to a mandatory 37%; below that it's a flat 22% prepayment tied to the third bracket.
Connecticut: no separate bonus rate. With no published supplemental rate, Connecticut withholds a bonus using the aggregate method — combined with your regular pay. Connecticut's income tax is graduated across seven Connecticut brackets topping out at 6.99%, so an aggregated bonus is withheld somewhere along that schedule.
FICA is the real tax. Social Security (6.2% to the wage base) and Medicare (1.45%, +0.9% above $200,000) are owed at the same rate they're withheld. The income-tax withholding is the only part that can come back — the FICA share is settled the moment it's taken.
The Connecticut paycheck calculator covers take-home pay on a normal Connecticut paycheck.
Connecticut bonus tax FAQ
Do I get a refund on my Connecticut bonus?
If 22% was more than your real rate, yes — the over-withheld income tax returns at filing. If your marginal rate tops 22%, you owe the shortfall. FICA doesn't come back either way.
Does Connecticut have a separate bonus withholding rate?
No. Connecticut has no separate supplemental rate, so a bonus is withheld with the aggregate method — as if it were part of your regular wages.
What rate does Connecticut withhold on a bonus in 2026?
Connecticut's supplemental withholding is the aggregate method, added to the flat 22% federal prepayment (37% on bonus pay over $1,000,000/yr) and 7.65% FICA. Only the income-tax portion is a prepayment; it trues up at your real rate.
Is there a special bonus tax rate in Connecticut?
No. The 22% federal and the state supplemental rate are withholding defaults, not rates that apply only to bonuses. Your real tax is your ordinary marginal rate.
Bonus tax calculators near Connecticut
Connecticut paycheck calculator · all state bonus tax calculators →
Sources
- IRS Publication 15 (2026) — Supplemental Wages (flat 22% / 37% above $1M)
- Connecticut income-tax status & rate: see the Connecticut paycheck calculator sources (state DOR, verified 2026-06-16).