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Important Corporate Tax Dates
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Annual corporate tax returns are due six months after the fiscal year end
Taxes payable are due ​two months after the fiscal year end
Taxes payable are due three months after the fiscal year end for Canadian-controlled private corporation​s
Instalment payments are due on the last day of every complete month of your tax year, or of every complete quarter if you are an eligible small Canadian-controlled private corporation​s
February 28 - Annual T4/T5 slips and T4/T5 summary returns due
​​​Annual GST returns and payments due ​​​April 30
Quarterly GST returns and payments due January 31, March 31, July 31, October 31
Monthly GST returns and payments are due on the last day of the following month
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Quarterly WSIB ​​returns and payments due January 31, March 31, July 31, October 31
Monthly WSIB returns and payments are due on the last day of the following month
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April 30 - Annual WSIB reconciliation
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