Contact us: Ontario Quarterly FinancesThere are many ways to contact us. Social media Twitter:@ONfinancePhone numbersToll-free: 1-866-668-8297For people with hearing disabilities:Toll-free TTY: 1-800-263-7776Fax: 1-866-888-3850AddressMinister of Finance Tax Office33 King Street West, PO Box 627Oshawa, OntarioL1H 8H5AccessibilityWe are committed to providing accessible customer service opens link in a new window . On request, we can arrange for accessible formats and communications supports.Send us an email Message(required)please don’t include any personal or financial information Would you like a reply? (required) Would you like a reply? (required) Yes Nosee the service standards opens link in a new window for how long it will take to get a reply Emailyou will receive a confirmation email Optional information Name Phone number Addresswe will contact you by letter if we need personal or financial informationYour 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 see our privacy statement opens link in a new window .