Ministry of Finance

Inquiries + Change of Address

1 866 668 8297

1 866 888 3850

WSIB - employeraccounts@wsib.on.ca

Employer Accounts

416 344 4684

E-File Desk - T1 Corporation - CRA

Help Desk

1 800 959 2803

E-File Desk - T1 Individuals - CRA

Help Desk

1 800 361 6283

1 833 494 0790

HST/GST Business

Business Inquires

1 800 959 5525 & 1 800 959 82287

1 519 645 5026

Canada Pension Plan CPP / Old Age Security OAS

General information and benefits

1 800 277 9914

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Canada Revenue Agency

Income tax payment arrangement

1 800 863 8657

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Canada Revenue Agency

Tax information phone service

1 800 267 6999

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Canada Revenue Agency

Individual income tax inquiry

1 800 959 9281

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Canada Revenue Agency

Income tax refund inquiry

1 800 959 1956

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