TY25 Deadlines for Business Tax Preparation Services

It’s almost time to start preparing for tax season! Please take note of the important dates coming up:

For All Businesses:

• November 7-10 – 2025 Tax Proposals will be posted in your TaxDome portal. You’ll receive an email notification when yours is ready (check junk/spam folders), but you can log in anytime to view it.

• December 20 – Proposal Signature Deadline. To reserve your spot, your proposal must be signed by this date — no exceptions. Unsigned proposals will forfeit your spot. If signed after this date, preparation will not begin until May 2026.*

• January 17 – Our official tax season communication begins. You’ll receive detailed instructions and your annual Tax Questionnaire in your TaxDome portal.

For S-Corps (1120-S) and Partnerships (1065):

• February 15 – Questionnaire Submission Deadline. To ensure your return is completed by March 16, your Tax Questionnaire, tax-ready books, and all required documents must be submitted by this date. Items received after February 15 will be extended.*

• March 16 – Filing Deadline. All e-file signatures and payments to tax agencies are due by this date.

For C-Corps (1120-C):

• March 22 – Questionnaire Submission Deadline. To ensure your return is completed by March 16, your Tax Questionnaire, tax-ready books, and all required documents must be submitted by this date. Items received after February 15 will be extended.*

• April 15 – Filing Deadline. All e-file signatures and payments to tax agencies are due by this date.

*= Blank extensions will be filed for these. If you believe you will owe, you are responsible for estimating a payment to make to the IRS and any applicable state(s). We are not responsible for penalties and interest if you do not make a payment by the appropriate filing deadline.

Please feel free to contact us with any questions you may have. Our office hours are 9am-5pm, Monday through Friday.

If you have questions, please reach out through the TaxDome portal.