- Due date for third-quarter 2017 form 941, Employer's Quarterly Federal Tax Return.
- Due date for third-quarter 2017 state and local employer withholding returns and unemployment compensation returns.
- Due date for third-quarter 2017 individual local estimated tax payments in many Pennsylvania municipalities.
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Earlier Event: October 16
Monday, October 16, 2017
Later Event: November 15
Wednesday, November 15, 2017