Missed your GST/HST deadline? A small delay can become an extra bill.
A busy quarter ends. The return stays on your to-do list. By the time you notice, the deadline has passed.
Read the guide →The small-business deadline library
Know what is due.
Know what to do next.
Plain-language guides for Canadian owners: which deadline applies, what to prepare, and what a missed filing could cost. Start with the question on your mind.
New here? See what the calendar does.
How the calendar helps →A business profile, your deadlines, a preparation checklist, and separate filing and payment records.
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Deadline guides
GST/HST
GST/HST filing and payment deadlines: which date applies to you?
Understand monthly, quarterly and annual GST/HST deadlines, the sole-proprietor exception, and the records to prepare before filing.
Read the guide →No sales this quarter: do I still need to file a GST/HST nil return?
A quiet reporting period does not automatically remove a GST/HST filing obligation. Check whether a nil return is appropriate and keep the receipt.
Read the guide →GST/HST instalments for annual filers: one return, several payment dates
Annual GST/HST filing can still involve quarterly instalments. Check the CRA threshold, fiscal-quarter dates and payment records to keep.
Read the guide →Deadline guides
Corporate tax
Missed the T2 filing deadline? The penalty can dwarf a year of reminders.
Finishing the books is only part of the job. The corporate return also needs to reach the CRA on time.
Read the guide →T2 filing deadline vs corporate tax payment deadline: two dates to track
A six-month T2 filing deadline does not give every corporation six months to pay. Learn the distinction and plan your year-end handoff.
Read the guide →Corporation annual return vs T2 tax return: what Canadian owners miss
A corporate registry annual return and a CRA T2 return are different filings. Learn what federal corporation owners should track separately.
Read the guide →Corporate tax instalment due dates: monthly or quarterly in Canada?
Separate corporate tax instalments from the year-end balance and T2 return. Check the quarterly eligibility conditions before choosing a schedule.
Read the guide →Inactive corporation with no income: do you still need a T2 return?
No revenue does not automatically remove a corporation’s T2 filing obligation. Check the tax year, outstanding accounts and separate annual-return task.
Read the guide →Deadline guides
Payroll & slips
Paid your employees. Forgot the CRA remittance. What happens next?
Running payroll and sending source deductions to the CRA are separate tasks. Completing one does not complete the other.
Read the guide →CRA payroll remittance due dates: regular, quarterly and accelerated
Find the payroll remitter type that controls your CRA due dates, and build a routine that separates employee payday from remittance.
Read the guide →T4 filing deadline and year-end checklist for Canadian employers
Prepare employee information, reconcile payroll and retain submission evidence before the T4 deadline. See the ordinary deadline for 2026 slips.
Read the guide →Deadline guides
Self-employed
Self-employed tax deadlines in Canada: April payment, June filing
Understand why self-employed Canadians generally have a June filing date but an April payment date, with a separate check for GST/HST.
Read the guide →Deadline guides
Quebec
Quebec GST/HST and QST filing deadlines: a small-business checklist
Check Revenu Québec’s monthly, quarterly and annual reporting rules, including the annual individual-filer exception and separate payment tracking.
Read the guide →Deadline guides
Getting started
What is a Canadian small-business compliance calendar?
See how a personalized calendar connects tax deadlines, preparation checklists and completion records—and what Compliance Calendar does for a business owner.
Read the guide →Missed a CRA deadline and cannot pay in full: what to check next
Separate the outstanding return from the unpaid balance, find the correct CRA account, and prepare for a payment-arrangement conversation.
Read the guide →How long should a Canadian small business keep tax records?
Understand the general CRA six-year record rule, important exceptions and why a filing confirmation is not a complete bookkeeping archive.
Read the guide →Year-end checklist: what to send your accountant before a tax deadline
Create a clear handoff with your accountant: records, missing questions, payment review dates and filing confirmations, all tied to the correct business and period.
Read the guide →Add your tax deadlines to Google Calendar or Outlook: import vs subscription
Use an .ics download for a snapshot or a calendar URL for a subscription. Understand updates, duplicate imports and the privacy of a subscription link.
Read the guide →How we write these guides
We explain practical questions using CRA, Revenu Québec and corporate-registry guidance. Every article links to its official sources and shows when they were reviewed. Worked penalty examples are hypothetical. Account-specific notices and special situations still need checking with the relevant authority or your adviser.
Found a different date? Compare the reporting period, business structure and account notice before relying on an example. These articles provide general information rather than individual tax advice.
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