Important Dates | Ryan Merkley, Chartered Professional Accountant

Jan

31

2026

Corporate Income Tax Return Due! (Year-end: July)

For companies with a July year-end.

Feb

28

2026

T4/T5 Filing Deadline

Make sure you file your T4's and T5's on or before the last day of February to avoid penalties.

Feb

28

2026

Corporate Income Tax Return Due! (Year-end: August)

For companies with an August year-end.

Mar

01

2026

RRSP Contributions Deadline

March 1 is the deadline for contributing to an RRSP for the prior tax year.

Mar

15

2026

EHT Returns Due

If your payroll exceeded $1 million (2020) you need to file your EHT Return to the Ontario Ministry of Finance

Mar

31

2026

Corporate Income Tax Return Due! (Year-end: September)

For companies with a September year-end.

Apr

30

2026

Corporate Income Tax Return Due! (Year-end: October)

For companies with an October year-end.

Apr

30

2026

T1 Personal Tax Returns Due!

Sole proprietors excluded

May

31

2026

Corporate Income Tax Return Due! (Year-end: November)

For companies with a November year-end.

Jun

15

2026

T1 Personal Tax Returns Due!

Sole proprietors

Jun

30

2026

Corporate Income Tax Return Due! (Year-end: December)

For companies with a December year-end.

Jul

31

2026

Corporate Income Tax Return Due! (Year-end: January)

For companies with a January year-end.

Aug

31

2026

Corporate Income Tax Return Due! (Year-end: February)

For companies with a February year-end.

Sep

30

2026

Corporate Income Tax Return Due! (Year-end: March)

For companies with a March year-end.

Oct

31

2026

Corporate Income Tax Return Due! (Year-end: April)

For companies with an April year-end.

Nov

30

2026

Corporate Income Tax Return Due! (Year-end: May)

For companies with a May year-end.

Dec

31

2026

Corporate Income Tax Return Due! (Year-end: June)

For companies with a June year-end.