Blumark Toolbox

Important Dates

01/31/26:
The mailing deadline for all businesses to provide statements for Forms W2, 1098, most 1099s, etc.

02/15/26:
The mailing deadline for all businesses to complete a 1099-B (Brokerage Statement*).

03/16/26:
Partnerships and S Corporation filing deadline and issuance of K-1s.

04/15/26:
Filing or extension deadline for Federal Income Tax Returns for Individuals and Corporations. States vary.

09/15/26:
Partnerships. File a calendar year return (Form 1065). This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see March 16, earlier. Provide each partner with a copy of their final or amended Schedule K-1 (Form 1065) or substitute Schedule K-1 (Form 1065).
S Corporations. File a calendar year income tax return (Form 1120-S) and pay any tax, interest, and penalties due. This due date applies only if you timely requested an automatic 6-month extension of time to file the return. Otherwise, see March 16, earlier. Provide each shareholder with a copy of their final or amended Schedule K-1 (Form 1120-S) or substitute Schedule K-1 (Form 1120-S).
Corporations. Deposit the third installment of the estimated income tax. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.

10/15/26:
Final extended deadline for your individual tax return and C Corporations

If you would like to receive more information about our tax preparation and planning services, please call us at (248) 289-1647 or contact us through our website.

Auburn Hills Location

Office Hours: Monday-Friday 8:30 am - 5:00 pm

Bay City Location

Office hours: Monday-Friday 8:30 am - 5:00 pm