Welcome to the Seyon Tax client login.

Announcements

Welcome! We are delighted to have you as a valued client.

As we navigate through the year together, you can find key dates below. Feel free to explore the portal, and if you have any questions or need assistance, our team is just a message or a call away.

Thank you for choosing Seyon Tax—we look forward to providing you with exceptional service.

Your Secure Portal

We use a secure portal to transfer your sensitive documents back and forth.

You will need login credentials to sign in, which should have been provided to you by your Seyon representative.

If you have any questions about this process, please speak with your Seyon representative or give us a call at (416) 438 – 3350.

Click here to access your secure portal

Key Dates

2 January 2024

First day of tax year

31 January 2024

2023 T2 Corporate Income Tax return filing due date for corporations with July 31 year-end

19 February 2024

First day to file 2023 tax return online

29 February 2024

Last day for employers to issue T4, T4A and T5 slips to employees and CRA
Last day to make RRSP contributions for 2023 tax year
2023 T2 Corporate Income Tax balance payment due date for corporations with December 31 year-end and without small business month extension

15 March 2024

First instalment payment due dates for 2024 if quarterly installments must be paid

1 April 2024

2023 HST return filing and payment due date for non-individual (corporations and partnerships) annual filers with December 31 year-end
2023 T2 Corporate Income Tax balance payment due date for corporations with December 31 year-end and small business month extension

30 April 2024

T1 Personal Income Tax filing due date for individuals without self-employment income and balance payment due date for all individuals
2023 HST payment due date for individual (self-employed) annual filers with December 31 year-end

17 June 2024

2023 T1 Personal Income Tax filing due date for self-employed individuals
2023 HST return filing due date for individual (self-employed) annual filers with December 31 year-end
Second instalment payment due dates for 2024 if quarterly installments must be paid

2 July 2024

2023 T2 Corporate Income Tax return filing due date for corporations with December 31 year-end

16 September 2024

Third instalment payment due dates for 2024 if quarterly installments must be paid

30 September 2024

2024 T2 Corporate Income Tax balance payment due date for corporations with July 31 year-end and without small business month extension

31 October 2024

2024 HST return filing and payment due date for annual filers with July 31 year-end
2024 T2 Corporate Income Tax balance payment due date for corporations with July 31 year-end and small business month extension

16 December 2024

Fourth instalment payment due dates for 2024 if quarterly installments must be paid

31 December 2024

Last day of tax year

Downloads

Income Tax Brackets 2024Latest tax formsPersonal Income Tax GuidelinesCorporate Income Tax GuidelinesFrequently Asked Questions