What happens if I file my HST return late?
A late HST return with a balance owing triggers a penalty of 1% of the balance plus a monthly add-on, and interest at CRA’s prescribed rate until paid.
If you file an HST return late and owe money, CRA charges a penalty built from two pieces: 1% of the balance owing, plus a quarter of that 1% for each full month late, up to twelve months. Interest at CRA’s prescribed rate runs on top, compounding daily, until the balance is cleared.
The exact formula, with an example
The GST/HST late-filing penalty is 1% of the balance owing, plus 0.25% of that balance for each full month the return is late, to a maximum of 12 months — so the penalty itself tops out at 4% of what you owe. On a return with $10,000 owing filed six months late: 1% ($100) + 0.25% × 6 months ($150) = $250, before interest.
Two things people mix up. First, this is not the income-tax formula — a late corporate T2 return is penalized far more steeply (5% plus 1% per month), so “I’ll file everything late together” costs more than it looks. Second, ignoring a CRA demand to file adds its own $250 penalty per return on top.
Interest on top of the penalty
Interest is charged at CRA’s prescribed rate for overdue amounts — 7% for Q3 2026, reset quarterly — compounded daily from the day after the payment was due until the balance hits zero. Unlike the penalty, interest has no cap, which is how a two-year-old HST debt quietly outgrows the original tax.
Annual filer? Instalments are the other trap
If you file annually and your net tax was $3,000 or more, CRA expects quarterly instalments the following year, and charges instalment interest at the same overdue rate on any that are late or short. It is entirely possible to file the annual return on time and still owe interest because the instalments underneath it were missed.
Filing frequencies and due dates
| Filing frequency | Who it applies to | Return due |
|---|---|---|
| Annual | Taxable sales of $1.5M or less (the default) | Three months after the corporation’s fiscal year-end |
| Quarterly | Taxable sales over $1.5M up to $6M | One month after each quarter ends |
| Monthly | Taxable sales over $6M (or by election) | One month after each month ends |
You can always elect to file more often than your threshold requires — growing businesses sometimes choose quarterly filing so the HST set-aside never gets big enough to spend by accident. If you are still deciding whether you need to register at all, start with do I need to charge HST?, and if your costs are low relative to sales, the quick method may simplify the return itself.
Already behind? How to shrink the damage
- File even if you cannot pay. Filing stops the late-filing penalty from growing; CRA sets up payment arrangements for the balance.
- Taxpayer relief. CRA can cancel or waive penalties and interest for circumstances beyond your control (Form RC4288), with a ten-year window to ask.
- Voluntary disclosure. For returns CRA has not chased yet, the Voluntary Disclosures Program can provide penalty relief in exchange for coming forward completely and paying the tax — it must be genuinely voluntary, so it stops being available once CRA reaches out first.
If you are owed a refund, file anyway
No balance owing generally means no late-filing penalty — but an unfiled return blocks your refund, can freeze other CRA accounts’ refunds, and puts your compliance record offside, which matters if you ever need flexibility from CRA later.
The compounding problem
Most late HST returns are late because the bookkeeping behind them is behind. One skipped quarter becomes two, the numbers get harder to reconstruct, and the penalty math grows with the balance. The fix is boring: books that are current, and returns that are prepared from them on schedule.
This is general information, not tax advice for your situation. Get started and a Canadian accountant will give you the answer for your business.
Common questions
I can't pay the HST I owe. Should I still file on time?
Yes. Filing on time avoids the late-filing penalty even if you cannot pay in full, and CRA will set up payment arrangements. Not filing makes everything worse.
How far behind can HST filings get before it's serious?
CRA can demand a return at any time, and persistent non-filing can lead to arbitrary assessments where CRA estimates your sales for you, rarely in your favour. Two missed periods is the point to act.
How much is the HST late-filing penalty?
One percent of the balance owing, plus 0.25% of the balance for each full month late up to twelve months — a maximum of 4% of what you owe. A $10,000 balance filed six months late costs $250 in penalty. Interest at CRA’s prescribed overdue rate (7% for Q3 2026, compounded daily) runs on top and has no cap.
Is the HST penalty the same as the income tax late-filing penalty?
No — the income tax penalty is much harsher. A late T2 with a balance owing starts at 5% plus 1% per month, versus 1% plus 0.25% per month for HST. Businesses that are behind on everything sometimes triage the wrong return first; the order matters.
Do I have to pay HST instalments?
If you file annually and your net tax for the year was $3,000 or more, CRA expects quarterly instalments the following year. Missed or short instalments accrue instalment interest at the prescribed overdue rate even if the annual return itself is filed on time. Quarterly and monthly filers pay with each return instead.
Can CRA cancel HST penalties and interest?
Sometimes. The taxpayer relief provisions let CRA waive penalties and interest where circumstances beyond your control caused the delay — serious illness, disaster, CRA error — requested on Form RC4288 within ten years. The Voluntary Disclosures Program can also provide relief for unfiled returns if you come forward before CRA contacts you. Neither is automatic, and both work better with a complete, accurate filing history attached.