Connecticut Gambling Tax: Rates, Withholding, and Losses

The Connecticut gambling tax applies to every dollar you win from wagering, taxed as ordinary income at the state’s progressive rates of 2% to 6.99%. The sting for Connecticut gamblers is what the state does not allow: unlike the federal government, Connecticut does not let you deduct gambling losses, so you can owe real state tax even in a year you broke even or came out behind.¹

What Winnings Connecticut Taxes

If you risked something of value to get it, Connecticut treats it as taxable income. That covers casino table games and slot machines, retail and online sports betting, lottery prizes, horse racing payouts, poker tournament winnings, fantasy sports, bingo, and raffles. Online winnings from Connecticut’s licensed platforms are taxed the same as cash paid out at Mohegan Sun or Foxwoods.¹

Connecticut’s income tax starts with your federal adjusted gross income. Federal rules already require you to include all gambling winnings in AGI, so those amounts flow automatically onto your Connecticut return. You do not list winnings separately on the state form. You also cannot subtract them.²

One point that trips people up: you owe tax on winnings whether or not a payer sends you a W-2G. The W-2G is a reporting document that kicks in at specific thresholds, but a $1,500 slot hit with no form attached is still taxable income on both your federal and Connecticut returns.³

Connecticut Tax Rates on Winnings

There is no separate flat rate for gambling income in Connecticut. Winnings are added to your other income and taxed through the state’s seven-bracket system, where only the portion of income within each bracket is taxed at that bracket’s rate. The rates for 2026:⁴

2% on the first $10,000 (single) or $20,000 (married filing jointly)
4.5% on $10,001–$50,000 (single) or $20,001–$100,000 (joint)
5.5% on $50,001–$100,000 (single) or $100,001–$200,000 (joint)
6% on $100,001–$200,000 (single) or $200,001–$400,000 (joint)
6.5% on $200,001–$250,000 (single) or $400,001–$500,000 (joint)
6.9% on $250,001–$500,000 (single) or $500,001–$1,000,000 (joint)
6.99% over $500,000 (single) or over $1,000,000 (joint)

Here is how that plays out. A single filer with $60,000 in wages who wins $15,000 at a casino is taxed on $75,000 of total income. The first $10,000 is taxed at 2%, the next $40,000 at 4.5%, and the remaining $25,000 at 5.5%. The $15,000 in winnings does not get its own rate. It simply lands in whichever bracket your total reaches.

Withholding on Your Payout

The Connecticut Lottery Corporation withholds state income tax at 6.99% on all reportable lottery prizes paid to residents and nonresidents, regardless of whether federal tax is also withheld.⁵

For non-lottery gambling, Connecticut requires 6.99% withholding when three conditions are met: the payer has an office or does business in Connecticut, the payment would be subject to federal income tax withholding, and the winner is a Connecticut resident. In practice, that means Mohegan Sun and Foxwoods withhold 6.99% for Connecticut on large payouts to residents.²

On the federal side, a flat 24% is withheld on winnings of $5,000 or more from sweepstakes, wagering pools, lotteries, and sports wagering. If you fail to give the payer a taxpayer identification number, 24% backup withholding can apply to smaller reportable amounts as well.⁶

Stack those together and a large lottery check can see nearly 31% withheld before it reaches you: 24% federal plus 6.99% Connecticut. Both amounts are credits against your actual tax liability when you file. If too much came out, you get the excess back as a refund.

Why Losses Don’t Help You in Connecticut

Federal law lets you deduct gambling losses up to the amount of your winnings if you itemize on Schedule A. That deduction reduces your federal taxable income.⁷

Connecticut does not follow that rule. The Department of Revenue Services states plainly that gambling losses are not deductible for Connecticut income tax purposes, even when they are deductible on your federal return.¹

The practical effect is severe. Say you won $30,000 at various casinos over the year and lost $25,000 along the way. On your federal return, your losses offset most of your winnings, leaving $5,000 of net gambling income subject to federal tax. On your Connecticut return, you owe state tax on the full $30,000. There is no mechanism to reduce it. For a filer in the 6% bracket or higher, the state bill on gambling income alone could top $2,000 in a year you barely came out ahead.

The Professional Gambler Exception

One narrow carve-out exists. If the IRS treats your gambling as a trade or business, your wins and losses are reported on Schedule C instead of being split between gross income and Schedule A. Net gambling income after losses and business expenses flows into your federal AGI, and because Connecticut starts from AGI, professional gamblers effectively get their losses recognized at the state level too. Qualifying is difficult. The IRS weighs whether gambling is your primary income source, whether you keep business-like records, and whether you pursue it with the regularity and profit motive of a trade.

Filing Your Connecticut Return

Connecticut residents report gambling winnings on Form CT-1040. Because the return begins with federal AGI, and winnings are already inside that number, there is no separate line for them.

You are required to file a Connecticut return if your gross income exceeds the state’s threshold for your filing status. For the 2025 tax year (filed in 2026), those thresholds are approximately $15,000 for single filers, $24,000 for joint filers, $19,000 for head of household, and $12,000 for married filing separately. A modest win can push someone over the line who otherwise would not have had to file.¹

If your income falls below the threshold but Connecticut tax was withheld from a win, the state will not send that money back automatically. You have to file to claim it.

Credit for Lottery Taxes Paid to Another State

A Connecticut resident who wins a lottery prize in another state and pays that state’s income tax on it can claim a credit on the Connecticut return for the tax paid elsewhere.⁸ The credit covers lottery winnings only. For casino games, sports bets, horse racing, and other non-lottery gambling won in another state, Connecticut does not allow a credit for the income tax you paid there.¹

Nonresidents and Part-Year Residents

Connecticut treats nonresidents unusually well. If you live in another state and win at a Connecticut casino, on a Connecticut sports betting platform, or through any other non-lottery wager, Connecticut taxes none of it. Non-lottery gambling income is not treated as Connecticut-source income for nonresidents.²

Lottery is the exception. A nonresident who wins a reportable Connecticut Lottery prize has Connecticut-source income, 6.99% is withheld, and the nonresident must file Form CT-1040NR/PY to reconcile.⁸

Part-year residents owe Connecticut tax on winnings received during the months they were residents. Wins before you moved in, or after you moved out, are not Connecticut’s to tax. Part-year filers also use Form CT-1040NR/PY.²

Estimated Tax Payments After a Big Win

A substantial mid-year win can create a quarterly payment obligation. Connecticut requires estimated payments if you expect to owe more than $200 in state income tax after withholding. This commonly happens when you win somewhere no Connecticut tax was withheld, such as an out-of-state casino or an online platform that withholds only federal tax.

Federal estimated tax deadlines for 2026 are April 15, June 15, September 15, and January 15, 2027.⁹ Connecticut uses a similar quarterly schedule. If you hit a jackpot and nothing was withheld for the state, making a payment soon after is the simplest way to avoid interest charges.

Side Effects on Medicare and Social Security

Winnings raise your AGI, and a higher AGI can push you into higher Medicare premiums two years later. Medicare Part B premiums are based on modified adjusted gross income from two years prior. The 2026 standard monthly premium is $202.90, but higher earners pay a surcharge known as IRMAA. For single filers, the first IRMAA tier starts at income above $109,000 and raises the premium to $284.10 a month. For joint filers, that tier begins at $218,000. At the top tier, the monthly premium reaches $689.90. A single large payout can push you into a higher tier for one year and cost you hundreds of dollars a month in premiums down the road.¹⁰

Social Security benefits are also affected. The taxable portion depends on “combined income,” which is half your Social Security benefit plus other taxable income, gambling included. Single filers with combined income above $34,000 and joint filers above $44,000 can see up to 85% of their Social Security benefits taxed. Those thresholds are not inflation-adjusted, so even a moderate win can tip retirees into the higher taxable percentage.

Records You Need to Keep

The IRS and the Connecticut DRS can disallow claimed losses and question reported winnings if you cannot back them up. The IRS expects a contemporaneous gambling diary, kept as you go rather than reconstructed at tax time.

Your diary should include:

The date and type of each gambling session
The name and location of the casino, track, or platform
The amounts won and lost per session
The names of anyone with you

Supporting documents give the diary credibility. Keep W-2G forms, casino win/loss statements, betting platform transaction histories, losing tickets, and bank or card records tied to gambling activity.⁷

Even though Connecticut does not permit a loss deduction, these records still matter at the state level. Your federal loss deduction depends on them, and the winnings number that flows onto your Connecticut return is only as accurate as the records behind it. Underreporting on the federal side creates problems on the state side as well.

1
Connecticut Department of Revenue Services. Connecticut Income Tax Treatment of Gambling Winnings Other Than State Lottery Winnings
2
Connecticut General Assembly. Income Tax Treatment of Gambling Winnings and Losses in Connecticut
3
Internal Revenue Service. Instructions for Forms W-2G and 5754 (Rev. January 2026)
4
Connecticut General Assembly. Connecticut Income Tax Rates and Brackets Since 1991
5
Connecticut Department of Revenue Services. Connecticut Tax Guide For Payers of Nonpayroll Amounts
6
Internal Revenue Service. Instructions for Forms W-2G and 5754
7
Internal Revenue Service. Topic No. 419, Gambling Income and Losses
8
Connecticut State Department of Revenue Services. Connecticut Income Tax Treatment of State Lottery Winnings Received by Residents and Nonresidents of Connecticut
9
Taxpayer Advocate Service. Making Estimated Payments
10
CMS. 2026 Medicare Parts A and B Premiums and Deductibles