March 15, 2026:

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• Federal Form 1065 (Partnership Income Tax Returns) **

• Federal Form 1120-S (S Corporation Income Tax Returns) **

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April 15, 2026:

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• Federal Form 1040 & Idaho form 40 (Individual Income Tax Returns)

• Idaho Form 65 (Partnership Income Tax Returns) **

• Idaho Form 41S (S Corporation Income Tax Returns) **

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April 30, 2026:

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• 1st Quarter 2026 Payroll Reports *

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* Some state due dates may vary; list is not all inclusive of reports that may be due                              

** Calendar Year Taxpayers

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