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2026
February 2
- Important Note: Since January 31 falls on a Saturday, any return, taxpayment, or other required action is not due until February 2.
- Quarterly Form 306 - Income Tax Withholding Return and income tax withheld are due for 4th quarter of 2025.
- Annual Form 306 - Income Tax Withholding Return and income tax withheld are due for 2025 calendar year.
- Annual Form 307 - Transmittal of Wage and Tax return and copies of Federal Form W-2 (and 1099 if applicable) for 2025 calendar year are due.
March 31
- Form NDW-R - Reciprocity Exemption from Withholding form for qualifying Minnesota and Montana residents working in North Dakota is due for the 2026 calendar year.
April 30
- Quarterly Form 306 - Income Tax Withholding Return and income tax withheld are due for 1st quarter of 2026.
July 31
- Quarterly Form 306 - Income Tax Withholding Return and income tax withheld are due for 2nd quarter of 2026.
November 2
- Important Note: Since October 31 falls on a Saturday, any return, tax payment, or other required action is not due until November 2.
- Quarterly Form 306 - Income Tax Withholding Return and income tax withheld are due for 3rd quarter of 2026.