Online Services

ONT‑TAXS online: First-time User

To use ONT‑TAXS online, your business or the business you represent, needs to:

  • be registered with the Ministry of Finance
  • have a ONe‑key account (i.e. ID and password)
  • be enrolled to use ONT‑TAXS online.

Your business can also give your employees or representatives (external accountants or bookkeepers) access to ONT‑TAXS online on behalf of your business.

To Sign Up for ONT‑TAXS Online:

  1. Submit the ONT‑TAXS online Contact of Information form

Identify who in your business will be your ONT‑TAXS online Administrator and then complete and submit the Contact of Information form to receive the information your business needs to start using ONT‑TAXS online.

The Administrator can be a signing officer, director, partner or sole proprietor of your organization or you can appoint an individual to be your Administrator and be responsible for ONT‑TAXS online on behalf of your business.

  1. Receive your Web Access Code and PIN in the mail

You will need this information to access ONT‑TAXS online through ONe‑key.

  1. Register for ONe‑key

ONe‑key verifies your identity and allows you to securely do business with the Government of Ontario online. Register for a ONe‑key account by creating an ID and password.

  1. Complete ONT‑TAXS online enrolment

After creating your ONe‑key account, you will complete the ONT‑TAXS online enrolment through ONe-key.

Here's how to do it:

  1. Login to ONe‑key
  2. Select ONT‑TAXS online from the listing of All Available Services
  3. Enter the Web Access Code you received in the mail
  4. Continue with the enrollment process by entering:
    1. the PIN you received in the mail
    2. your Account Number
    3. your last tax payment/refund amount. If you have never made a payment or received a refund, use the activation code provided on the letter with your web access code.
  5. Read and agree to the Terms and Conditions of Use for ONT‑TAXS online
  6. Create your ONT‑TAXS online profile


Once enrolled for ONT‑TAXS online, the Administrator can provide access to their representatives. As a representative, you can manage your clients' accounts with the Ministry of Finance using ONT‑TAXS online.

Register as a representative

If the business you represent uses ONT‑TAXS online and you would like to sign up as an ONT‑TAXS online representative:

  1. Call the ministry at 1‑866‑ONT‑TAXS (1‑866‑668‑8297) to be registered as a representative
  2. You will be issued a Web Access Code and PIN
  3. Set up your ONe‑key account and access ONT‑TAXS online as outlined above
  4. Provide your clients with your Web Access Code to allow them to add you as their ONT‑TAXS online representative

If you need assistance or are having problems enrolling, please call 1‑866‑ONT‑TAXS (1‑866‑668‑8297).

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