Accavallo & Company, LLC

Search

Upcoming Q1 2026 Tax Deadlines: What to Know and How to Prepare

As we close out the year and head into tax season, staying ahead of important deadlines is key to avoiding penalties, last-minute stress, and missed opportunities. Each quarter, we share essential tax filing and payment due dates, business compliance reminders, and planning tips to help our clients stay organized and confident.

Below is an overview of key Q1 2026 tax deadlines, along with reminders to help you prepare for the upcoming filing season.

Watch for Your 2025 Tax Organizer

As tax season approaches, please be on the lookout for your 2025 Tax Organizer, which will be delivered either by mail or digitally through the Onvio Client Portal.

These organizers are designed to:

  • Help you gather necessary tax information efficiently

  • Reduce back-and-forth during preparation

  • Make your tax filing process smoother and faster

Completing your organizer early allows us to begin planning and identify potential issues well before deadlines arrive.

Important Q1 2026 Tax Deadlines

January 15, 2026

  • 4th quarter estimated tax payment for 2025 due

  • Applies to individuals and businesses making quarterly estimated payments

January 31, 2026

  • Issue 1099 forms to vendors and independent contractors

  • Finalize 2025 rental income and expense reports

Ensuring accurate records at this stage helps prevent filing corrections later.

February 2, 2026

  • Deadline to file W-2s and 1099s with the Social Security Administration

  • Certain Affordable Care Act (ACA) reporting forms due

Timely filing is essential to avoid penalties and processing delays.

March 16, 2026

  • Partnership and S-Corporation tax returns due

  • Schedule K-1s must be issued to owners/shareholders

If you anticipate needing an extension, it’s best to plan ahead rather than wait until the deadline.

March 31, 2026

  • E-filing deadline for select informational forms, such as Form 3921

Tax Filing Season Begins Early

The IRS typically begins accepting 2025 individual income tax returns in late January 2026. Filing early can:

  • Reduce identity theft risk

  • Speed up refunds

  • Allow time to address any issues without pressure

Estimated Tax Payments: Plan Ahead

While outside of Q1, it’s important to note that the first quarter 2026 estimated tax payment is due April 15, 2026. Planning now helps ensure cash flow is available when the payment is due.

Don’t Forget State & Local Deadlines

State and local filing requirements vary and may include:

  • Income tax filings

  • Sales and use tax returns

  • Payroll and withholding reports

Be sure to review state-specific deadlines, as they may differ from federal due dates.

We’re Here to Help

Our goal is to help you stay informed, prepared, and confident throughout tax season. Please take time to review these upcoming deadlines and reach out if you need assistance preparing forms, organizing documentation, or planning ahead.

Thank you for your continued trust in our firm. We look forward to working with you in the new year and helping you meet every deadline with confidence.

Client Center Sign In

CHRISTINA IMPERIOLI

Supervisor, CPA

Christina Imperioli is a Supervisor at Accavallo & Company, LLC, where she specializes in the preparation and review of individual and business tax returns across a variety of industries. With a focus on accuracy, client service, and technical expertise, she plays a key role in helping clients navigate complex tax matters.

She began her career as a Staff Accountant at The Innovative CPA Group, quickly rising through the ranks to Senior Accountant and ultimately Supervisor, demonstrating a strong commitment to professional growth and leadership.

Christina is a Certified Public Accountant and an active member of both the Connecticut Society of CPAs (CTCPA) and the American Institute of Certified Public Accountants (AICPA). She holds a Bachelor of Business Administration in Financial Accounting from Western Connecticut State University.

Throughout her career, she has worked with clients in the real estate, construction, and retail sectors, bringing valuable insight and industry-specific knowledge to every engagement.

Outside of work, she enjoys traveling with her husband and son, spending time with her three dogs—two rescues named Cole and Indigo, and a Brussels Griffon named Louie—and exploring local bookstores. Christina is a passionate reader and podcast enthusiast, she often listens to new episodes during her daily commute.

Dual Heading Example

Insert a meaningful line to evaluate the headline.

Sherri Fisher is a Tax Manager at Accavallo & Company, LLC.  Sherri has longstanding expertise in Trust and Estate Taxation, Eldercare, and Estate planning. Sherri appreciates the relationships she has built with estate planning attorneys and advisors, to provide a team approach to assisting her clients. Sherri also has seasoned experience in business and individual taxation and is partial to assisting start-ups in developing overall accounting and operating plans.

Prior to joining Accavallo & Company, LLC, Sherri was a manager in a large firm, servicing high net worth trust clients, business, and personal clients. She was also a Partner in a large bookkeeping firm, which specialized in cloud accounting systems for regional and national companies. Sherri led a team in assisting clients to organize their accounting systems.  She is a graduate of Florida Atlantic University with a B.S. degree in Accounting.    

Sherri’s experience includes working with companies and organizations in a variety of industries including:

  • Investment Trusts

  • DAPT and Family Investment Partnerships

  • Estate and Probate Administration

  • E-Commerce

  • Manufacturing

  • Construction

  • Real Estate Investment

  • Marketing and Service-based industries

In addition to her professional accomplishments, Sherri is an Intuit Advanced Pro Advisor, Intuit Future Firm Advisory Board member, member of the Valley WIN Network, and proudly served as past Connecticut Public School liaison for the Yale Tommy Fund for Childhood Cancer. Sherri enjoys time with her family, Cleveland sports, thrifting and gardening.