Contact us On this page Skip this page navigation Contact us: Harmonized Sales Tax There are many ways to contact us. Social mediaTwitterFacebookLinkedInInstagramPhone numbersToll-free: 1-866-668-8297For people with hearing disabilities:Toll-free TTY: 1-800-263-7776Fax: 1-866-888-3850 AddressMinister of Finance Tax Office33 King Street West, PO Box 627Oshawa, OntarioL1H 8H5Visit a ServiceOntario locationServiceOntario offers walk-in services to Ministry of Finance clients at certain ServiceOntario locations. These services include issuing receipts and accepting the following:completed paper registration applicationsapplications for refundspayments and other documents in sealed and unsealed envelopescash payments (12 locations only)Visit a Ministry of Finance tax officeMinistry of Finance Tax Office representatives are available by appointment only. If you need to meet with a ministry representative to discuss your tax issue(s), please call 1-866-ONT-TAXS (668-8297).Find a Ministry of Finance Tax Office near you. Accessibility If you need information or communication supports in a different format, please let us know by using the phone numbers or contact form on this page. Learn more about our policy on providing accessible customer service to persons with disabilities. Send us an email Message Please do not include any personal or financial information. Would you like a reply? Read the service standards for how long it will take to get a reply. Would you like a reply? Yes No Email You will receive a confirmation email. Optional information Name Phone number Address We will contact you by letter if we need personal or financial information. Your privacy mattersYour personal information is being collected in order to respond to your inquiry. Your inquiry/personal information will be forwarded to the appropriate ministry(s) for response and will be used to respond to your inquiry. Some of the non-identifying information shared will be used by Cabinet Office and/or ServiceOntario to measure performance and improve our services. Your information will not be placed on mailing lists or released to any third party, except as may be authorized by law.For questions on how personal information collected on this page will be used, please read our privacy statement. Leave this field blank Updated: November 20, 2024 Published: November 25, 2021