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C- Corporation Tax Organizer

Filing Deadline

The filing deadline for Form 1120 is 3.5 months after the corporation's year-end.  For calendar-year corporations, the filing deadline is April 15.  
If you cannot file by the deadline, you can request a 6-month extension of time to file by filing IRS Form 7004.  To be accepted, Form 7004 must be filed on or before the original due date of the return.

Record-Keeping Requirements

All businesses are required by law to maintain income and expense records.  Record-keeping requirements are described in IRS Pub 583 Starting a Business and Keeping Records.  Generally IRS requires you keep two kinds of records for all business expenses you incur or pay:

  1. Proof of the expense - such as a receipt or log, and
  2. Proof you paid the expense - such as a cancelled check, bank statement, or credit card statement.

If you have questions about recordkeeping requirements for your business, please ask our staff.

C Corporation Tax Organizer

C-Corporations file Form 1120, which is a detailed tax return used to report income and expenses of the Corporation's business activities. We have designed our C-Corporation Organizer to assist you with organizing your information and preparing for your tax interview.

Your C-Corporation might be eligible for various deductions and tax credits. Be sure to notify your tax preparer if any of the following applied to your business during the year:

  • You started or purchased a business
  • You purchased real estate for use in your business or made improvements to buildings or other property used in your business
  • You purchased a hybrid vehicle or other energy-efficient device
  • You made disabled access improvements to your property
  • Your purchased or sold assets such as computers, photocopiers, production equipment or automobiles


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