Contact us: Ontario Trillium Benefit There are many ways to contact us. Social media Twitter:@ONfinance Phone numbers Toll-free: 1-866-668-8297 For people with hearing disabilities: Toll-free TTY: 1-800-263-7776 Fax: 1-866-888-3850 Address Minister of Finance Tax Office 33 King Street West, PO Box 627 Oshawa, Ontario L1H 8H5 Accessibility We 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 No see the service standards opens link in a new window for how long it will take to get a reply 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 matters Your 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 .