Ontario's online tax service, ONT-TAXS online
Secure, convenient and free online access to your business tax account(s) 24 hours a day, seven days a week.
Ontario has other online business services to help you:
Register your business
You can register or renew your business name, get a Master Business License and, if eligible, apply for additional accounts with different government bodies.
To register for federal programs (e.g. HST, payroll deductions, corporate income tax and import-export program), please visit Canada Revenue Agency's Business Registration Online.
File your tax returns
File tax returns using ONT-TAXS online and get immediate confirmation that your return was received by the ministry.
Change your business address
Update your business address, mailing address or phone number attached to your Corporations Tax, Employer Health Tax, or Retail Sales Tax accounts through ServiceOntario. If you are a registered ONT-TAXS online user, update information on your returns.
Important: To change business ownership information, please call the ministry at 1 866 ONT-TAXS (1 866 668-8297).
Close your account
Use the Change of Business Information service to close your Retail Sales Tax, Employer Health Tax, Harmonized Sales Tax and Corporate Income Tax accounts.