Every Tax Deadline Self-Employed Canadians Need to Know
Employees get one tax deadline a year and an employer who handles the rest. Self-employed Canadians get eight or more — spread across two tax systems, with the strange twist that your filing deadline and your payment deadline are six weeks apart. Missing one doesn't just mean stress: instalment interest, late-filing penalties, and compound daily interest all run on autopilot once a date slips past. This guide lays out the full calendar as it repeats every year — what's due, who it applies to, and which dates actually carry financial consequences — so you can set eight reminders once and stop thinking about it.
The Calendar at a Glance
| Date (each year) | What's Due | Who It Applies To |
|---|---|---|
| Late February | Information slips (T4A, T5, etc.) issued | Anyone receiving slips |
| ~March 1 (60 days after Dec 31) | RRSP contribution deadline for the prior tax year | Anyone contributing to an RRSP |
| March 15 | Q1 income tax instalment | Instalment payers |
| April 30 | Balance owing for the prior year (+ filing deadline for non-self-employed) | Everyone |
| June 15 | T1 filing deadline (self-employed + spouses); Q2 instalment; annual GST/HST return for calendar-year sole props | Self-employed filers |
| September 15 | Q3 income tax instalment | Instalment payers |
| December 15 | Q4 income tax instalment | Instalment payers |
| December 31 | Odometer reading; last day to pay for current-year deductions | Everyone with a business |
| Varies | GST/HST returns for quarterly and monthly filers | GST/HST registrants |
Late February: Slips Arrive and the RRSP Window Closes
Payers who issue information slips — a client that sends you a T4A, a bank issuing a T5 for interest — generally have until the end of February to do it. If you're expecting slips, there is little point starting your return before March. Your own invoice records remain the primary source for business income either way; slips should reconcile to them, not replace them.
Around the same time, the RRSP contribution window for the prior tax year closes — contributions made in the first 60 days of the year (typically to about March 1) can still be deducted on the return you're about to file. For self-employed Canadians with no employer pension, this is the main lever left to pull on last year's tax bill after December 31 has passed. See our RRSP guide for the self-employed for how the deduction interacts with business income.
March 15: The First Instalment
If your net tax owing exceeded $3,000 in the current year or either of the two prior years, the CRA expects you to prepay income tax in quarterly instalments — and the first one lands on March 15, before you've even filed last year's return. The CRA mails (or posts to My Account) instalment reminders in February with suggested amounts. Paying at least the prior-year amount in four equal payments is the safe harbour that guarantees no instalment interest. The full mechanics — the three calculation methods and what underpaying costs — are in our tax instalments guide.
April 30: The Deadline That Actually Matters
Whatever else you remember from this page, remember this one. Any balance owing for the prior tax year is due April 30 — for everyone, self-employed or not. Interest starts compounding daily on May 1 at the CRA's prescribed rate. April 30 is also the T1 filing deadline for Canadians without self-employment income.
Practically, this means a self-employed freelancer needs a reasonable estimate of last year's tax bill by late April even if the paperwork isn't finished. Most people in this position pay their estimate by April 30, then file the precise return in May or early June. Overpay slightly and you get it back; underpay and interest runs only on the shortfall.
June 15: The Filing Deadline — and the Trap Inside It
Self-employed individuals and their spouses or common-law partners get until June 15 to file the T1 return. June 15 is also the Q2 instalment date, and — for sole proprietors with a December 31 fiscal year who file GST/HST annually — the GST/HST return filing deadline as well (though the GST/HST payment was due April 30, mirroring the income-tax split).
September 15 and December 15: The Forgotten Quarters
The Q3 and Q4 instalments land in the two busiest stretches of the freelance year, which is exactly why they get missed. September 15 arrives after summer slowdowns have dented cash flow; December 15 competes with holiday spending and year-end client crunches. If you run the two-account system — moving 25–30% of every payment into a tax reserve as it arrives — these dates become transfers, not scrambles. Our self-employed taxes overview covers the reserve habit in detail.
December 31: The Quietest Big Deadline
Nothing is due to the CRA on December 31 — and yet it's the last day anything can change on the current year's return. Three things belong on the calendar:
- Record your odometer reading. The year-end odometer figure is half of the total-kilometres calculation behind your vehicle deduction. Thirty seconds on December 31 (and again January 1) saves an estimate the CRA can challenge later.
- Deductible spending closes. An expense generally belongs to the year it's incurred — the software renewal, insurance premium, or equipment purchase you were planning anyway lands on this year's return only if it happens before midnight.
- Run the year-end sweep. Unverified receipts, unclassified trips, missing invoices — the full pre-January checklist is in our year-end tax checklist for freelancers.
GST/HST Deadlines by Filing Frequency
GST/HST runs on its own schedule, set by your filing frequency:
| Filing Frequency | Return Due | Payment Due |
|---|---|---|
| Annual (sole prop, Dec 31 year end) | June 15 | April 30 |
| Annual (other year ends) | 3 months after fiscal year end | 3 months after fiscal year end |
| Quarterly | 1 month after each quarter end | 1 month after each quarter end |
| Monthly | 1 month after each month end | 1 month after each month end |
Note the annual sole-proprietor split mirrors income tax: file June 15, pay April 30. Registrants whose prior-year net GST/HST exceeded $3,000 also owe quarterly GST/HST instalments. The filing mechanics, the GST34 reconciliation, and how to change frequency are covered in our quarterly GST/HST remittance guide.
The Weekend and Holiday Rule
When any CRA deadline falls on a Saturday, Sunday, or public holiday the CRA recognizes, it rolls forward to the next business day — your return or payment is on time if received (or postmarked) that day. Useful to know; unwise to rely on. Some payment methods take a business day or more to land, and "it was in my bank's queue" is not a defence the CRA accepts.
What Lateness Actually Costs
- Late filing with a balance owing: a penalty of approximately 5% of the balance plus 1% per full month late, to a maximum of 12 months. If you were penalized for late filing in any of the three prior years and the CRA issued a demand to file, the repeated-failure version roughly doubles both figures. Verify the current numbers on canada.ca.
- Late payment: no penalty as such, but compound daily interest at the prescribed rate on the unpaid balance — and on any penalties — from the day after the deadline.
- Underpaid instalments: instalment interest at the same prescribed rate, calculated per underpaid quarter, and it is not waived for honest mistakes.
- Late filing with no balance owing: no late-filing penalty — but benefit and credit payments tied to your return can be interrupted, and an unfiled return keeps every limitation clock from starting. File anyway.
The pattern in all four: filing on time is always worth it, even when you can't pay. The penalty attaches to late filing; the interest attaches to late payment. Never combine them voluntarily.
Set These Reminders Now
Eight recurring calendar entries, set once:
- Late February — "Slips in? RRSP window closing (~March 1)."
- March 15 — Q1 instalment
- April 20 — "Estimate last year's balance — pay by April 30" (early on purpose)
- June 10 — "File T1 by June 15; Q2 instalment; annual GST/HST return"
- September 15 — Q3 instalment
- December 15 — Q4 instalment
- December 31 — Odometer photo; last-call deductible purchases; year-end sweep
- Your GST/HST dates — per your filing frequency, one month after each period end if quarterly
Deadlines are only stressful when they arrive with archaeology attached. If your receipts, trips and invoices are captured as they happen — which is what InvoiceFast's tax tab does all year — each of these dates becomes a transfer and a download, not a weekend of reconstruction.
Frequently Asked Questions
Do self-employed Canadians have to file by April 30?
No — self-employed filers (and their spouses) have until June 15 to file. But any balance owing is still due April 30, with daily interest from May 1. Pay in April, file by June.
What if a deadline falls on a weekend or holiday?
It rolls to the next business day. Your payment or return counts as on time if the CRA receives it (or it's postmarked) that day — but payment processing lag makes cutting it close a bad habit.
Is there a penalty for filing late if I don't owe anything?
No late-filing penalty applies without a balance owing, but benefit payments tied to your return can be interrupted, and instalment or GST/HST obligations may still be running. File on time regardless.
When are my GST/HST returns due?
Annual sole-prop filers with a December 31 year end: file June 15, pay April 30. Quarterly and monthly filers: one month after each period ends. Other annual filers: three months after fiscal year end.
When are quarterly instalments due, and do I have to pay them?
March 15, June 15, September 15, and December 15 — required once your net tax owing exceeds $3,000 in the current year or either of the two prior years. Paying the prior-year amount in four equal payments guarantees no instalment interest.