C corporation return (Form 1120)

Annual income tax return for a C corporation.

Key dates

April 15, 2027: Form 1120 due for calendar-year corporations (the 15th day of the fourth month after year-end)
October 15, 2027: deadline with a six-month extension (Form 7004)
Quarterly estimated tax payments are due during the year

C corporations pay a flat 21% federal rate; good records make sure every deduction is claimed.
Late filing costs 5% of the unpaid tax per month, up to 25%.
Owners' salaries and dividends are planned so the total tax on the business and on you stays reasonable.

Annual return for an S corporation, with a Schedule K-1 for each shareholder.

Annual return for partnerships and multi-member LLCs, with a Schedule K-1 for each partner.

Monthly or quarterly books in cloud software: bank reconciliations, sales tax tracking and reports you can read.

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