Connecting with a tax office representative

If you need to speak with a ministry representative to discuss your tax issue(s), collections questions or any Guaranteed Annual Income System related inquiries, please call 1-866-ONT-TAXS (668-8297).

Contact us by phone

For more information online

Visit the following pages for more information:

Contact us in writing

Ministry of Finance
33 King Street West
PO Box 625  
Oshawa, Ontario L1H 8H9

Visiting a Ministry of Finance office in-person

Tax returns, payments (no cash please) and other documents for the tax and benefit programs are accepted in person during business hours.

LocationAddressHours
(by appointment only)		Parking
OshawaMinistry of Finance
33 King Street West
Oshawa, Ontario L1H 8H5
  • Monday to Friday, 8:30 a.m. to 4:00 p.m.
  • Services are not available on government or statutory holidays
  • Services for tax programs continue to be available online, in writing and by phone.
Meter parking is available.

Ontario Corporations Tax

The Tax Offices will accept Ontario Corporations Tax (CT) payments and returns for tax years ending before January 1, 2009 in the drop boxes provided. The ministry cannot accept any CT payments and returns for tax years ending after December 31, 2008. All payments and returns for harmonized years must be sent to the Canada Revenue Agency (CRA).

Other taxes

Please contact the CRA at 1-800-959-5525 or 1-800-665-0354 for teletypewriter (TTY) to make enquiries relating to Ontario corporate income tax, corporate minimum tax, capital tax, special additional tax on life insurers, personal income tax and Corporations Information Act Annual Return.

Visiting a ServiceOntario centre for tax-related services

Some ServiceOntario locations are not open or are operating at reduced hours. Before you go to a ServiceOntario location, ensure the location is open and offers the service you need.

The Ministry of Finance's in-person services are available at certain ServiceOntario locations. These locations accept returns and non-cash payments for several types of taxes and benefit programs administered by the Ministry of Finance. Please check that your service is available on the location’s service page before visiting.

ServiceOntario locations accepting cash payments

In addition, the 12 ServiceOntario locations listed below accept cash payments.

Hours of Service

Ontario Corporations Tax

ServiceOntario locations will accept Ontario Corporations Tax (CT) payments and returns for tax years ending before January 1, 2009. ServiceOntario cannot accept any CT payments and returns for tax years ending after December 31, 2008. All payments and returns for harmonized years must be sent to the Canada Revenue Agency (CRA). Please contact the CRA at 1-800-959-5525 or 1-800-665-0354 for teletypewriter (TTY).

Privacy

ServiceOntario staff, like Ministry of Finance staff, are prevented by law from disclosing confidential information, except in accordance with provisions of the tax statutes and the Freedom of Information and Protection of Privacy Act.