Ontario taxes and COVID-19. Learn more.

ONT-TAXS online is Ontario's secure, convenient and free online tax service for your business and representatives. Access all of your accounts, stay up-to-date, go paperless, and pay and file your taxes at your convenience.

Login to ONe-key and access ONT-TAXS online

Not an ONT-TAXS online user?
What you need to activate ONT-TAXS online

Prefer to talk to us?

Call the Ministry of Finance at 1-866-668-8297.

First-time user

  • Signing-up is easy

Manage accounts

  • All account summaries in one view
  • Give access to employees or representatives


  • File and amend business tax returns


  • Complete tax payments easily
  • Add and edit bank accounts

Refund requests

  • Ask for or cancel a refund
  • Easy to view refund status

Security and support

  • Communicate securely
  • Highest internet security standards for encryption