Free CT & Federal Tax Deadline Reminders
Never miss a quarterly estimate or a Connecticut business deadline. Sign up once and get a short email before each due date.
For general education only. Not tax, legal, insurance, or investment advice, and not a promise of any result. Tax rules and due dates change, so confirm with the IRS (irs.gov), the CT Department of Revenue Services (portal.ct.gov/DRS) or your town before you act, and ask your tax preparer about your own situation.
Upcoming federal and Connecticut dates
For calendar-year filers. When a due date falls on a weekend or legal holiday, it moves to the next business day, and the dates below already reflect that.
| Due date | What's due | Source |
|---|---|---|
| Fri, Jan 15, 2027 | 4th-quarter 2026 estimated tax Federal Form 1040-ES and Connecticut CT-1040ES. | [1] [2] |
| Mon, Feb 1, 2027 | Forms 1099-NEC and W-2 (for 2026) January 31 is a Sunday, so the due date moves to Monday. For 2026 payments, the IRS reporting threshold for 1099-NEC is $2,000. Connecticut also wants copies of 1099s (with Form CT-1096) by the same date. | [1] [2] |
| Mon, Mar 15, 2027 | Partnership and S corporation returns Federal Form 1065 or 1120-S, and Connecticut Form CT-1065/CT-1120SI. If the business elects the CT pass-through entity tax, Form CT-PET is due the same day. | [1] [2] [3] |
| Wed, Mar 31, 2027 | CT annual report window closes LLCs and corporations file the annual report with the Secretary of the State between January 1 and March 31 ($80 for an LLC). | [1] |
| Thu, Apr 15, 2027 | 2026 individual returns + 1st-quarter 2027 estimates Federal Form 1040 and Connecticut CT-1040, plus Q1 2027 estimates. An extension gives more time to file, not more time to pay. | [1] [2] |
| Tue, Jun 15, 2027 | 2nd-quarter 2027 estimated tax Federal and Connecticut. Only two months after April. | [1] |
| Wed, Sep 15, 2027 | 3rd-quarter 2027 estimated tax Federal and Connecticut. Also the extended due date for most partnership and S corporation returns. | [1] [2] |
| Fri, Oct 15, 2027 | Extended 2026 individual returns Last day to file if you got a federal extension on Form 4868. | [1] |
| Mon, Nov 1, 2027 | Business personal property declaration If your business owned furniture, equipment or other business property on October 1, file a declaration with your town assessor by November 1. Late filing can add a 25% penalty. | [1] |
| Tue, Jan 18, 2028 | 4th-quarter 2027 estimated tax January 15, 2028 is a Saturday and Monday the 17th is Martin Luther King Jr. Day, so the due date moves to Tuesday. | [1] [2] |
Who usually needs these reminders
- Self-employed people, freelancers and gig workers with income that has no tax withheld. The IRS generally expects estimated payments if you expect to owe $1,000 or more for the year after withholding and credits (see Form 1040-ES). Connecticut uses a similar $1,000 test on Form CT-1040ES.
- Small-business owners who pay contractors (1099-NEC), run a partnership or S corporation, or have a Connecticut LLC that files an annual report.
- Anyone with business equipment in a Connecticut town, because the personal property declaration goes to your local assessor, not the state.
How to pay estimates
- Federal: IRS Direct Pay, your IRS Online Account or EFTPS, all at irs.gov/payments.
- Connecticut: myconneCT, the DRS online portal.
Want a rough number first? Try the free quarterly tax calculator or the CT estimated payments guide. They give educational estimates, not a tax bill.
Frequently asked questions
Is the reminder service free?
Yes. The email reminders are free. You can unsubscribe from any email with one click.
Do you send text message reminders?
Not right now. Reminders are email only for now. If we add texts later, you would have to opt in to them separately.
When will I get each reminder?
About 5 days before each date on this page, so you have time to pay or file. You'll get a confirmation email first, and nothing is sent until you click the link in it.
When are 2027 quarterly estimated taxes due?
For calendar-year filers, federal and Connecticut estimates for 2027 are due April 15, 2027, June 15, 2027, September 15, 2027 and January 18, 2028 (January 15 is a Saturday and the 17th is Martin Luther King Jr. Day).
Is the Connecticut pass-through entity tax still required?
No. For tax years starting on or after January 1, 2024, the Connecticut pass-through entity tax is elective. A partnership or S corporation that elects it files Form CT-PET by March 15 for calendar-year filers. Ask your tax preparer whether electing makes sense for you.
When is the Connecticut LLC annual report due?
The Secretary of the State takes LLC annual reports between January 1 and March 31 each year. The fee for a Connecticut LLC is $80.
Sources (Checked November 3, 2026)
- IRS: When are quarterly estimated tax payments due? (weekend/holiday rule)
- IRS: About Form 1040-ES, Estimated Tax for Individuals
- CT DRS: 2026 Form CT-1040ES (due dates, $1,000 rule)
- IRS: Instructions for Forms 1099-MISC and 1099-NEC ($2,000 threshold for 2026 payments)
- IRS: Am I required to file a Form 1099?
- CT DRS: Forms 1099 and CT-1096 filing requirements (due January 31)
- IRS: Instructions for Form 1065 (partnership return due date)
- IRS: Instructions for Form 1120-S (S corporation return due date)
- CT DRS: Pass-through entity tax information (elective since 2024; due March 15)
- CT Secretary of the State: LLC forms and fees (annual report filed Jan 1 to Mar 31, $80)
- IRS: About Form 4868 (extension to file, not to pay)
- CT General Statutes ยง 12-41 (personal property declaration due November 1; 25% late penalty)
- U.S. OPM: Federal holidays (Martin Luther King Jr. Day)
For general education only. Not tax, legal, insurance, or investment advice, and not a promise of any result. Tax rules and due dates change, so confirm with the IRS (irs.gov), the CT Department of Revenue Services (portal.ct.gov/DRS) or your town before you act, and ask your tax preparer about your own situation.
Behind on estimates or unsure which dates apply to your business? We can help you get organized.
Or call (475) 242-7941. Services are priced by quote.
Enhance Finance is a small-business finance practice serving Connecticut.