Here are some key tax-related deadlines for businesses and other employers during Quarter 3 of 2019. JULY 31: Report income tax withholding and FICA taxes for Q2 2019 (unless eligible for an Aug. 12 deadline). File a 2018 calendar-year retirement plan report or request an extension. SEPT. 16: If a calendar-year partnership or S corp. that filed an extension, file a 2018 income tax return. If a calendar-year C corp., pay the third installment of 2019 estimated income taxes. Contact us for more about the filing requirements and to ensure you meet all applicable deadlines.

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