The short answer most BC owners are looking for is this: your T2 corporate income tax return is due six months after your fiscal year-end, but your tax payment is due earlier — two months after year-end for most corporations, or three months if you are a Canadian-controlled private corporation (CCPC) claiming the small business deduction. On top of that, many established companies must remit monthly or quarterly instalments during the year rather than one lump sum. Mixing these dates up is the single most common reason otherwise-healthy BC businesses pay needless arrears interest. This guide shows you how to map your own year-end to every relevant deadline.
Why the filing date and the payment date are not the same
This trips up more owners than any other point in corporate tax, so let me be blunt: filing late and paying late are two separate problems with two separate costs.
- The return (the T2 itself) must be filed within six months of year-end.
- The tax owing must be paid within two or three months of year-end — well before the return is even due.
So a corporation can be perfectly on time with its filing in month six and still owe several months of interest, because the balance was technically due in month two or three. The CRA charges compound daily interest on unpaid balances from the balance-due day, regardless of whether the return has been filed yet.
When is your balance actually due — two months or three?
The three-month balance-due day is the extended deadline, and not every corporation qualifies for it. You get the three-month window only if both of these are true:
- You were a CCPC throughout the tax year, and
- You claimed the small business deduction in the current or the previous tax year (broadly, your business had taxable income within the small-business limit — the first $500,000 of active business income).
If either condition fails — for example, your taxable income exceeded the small-business limit and you did not claim the SBD — your balance reverts to the two-month deadline. For a December 31 year-end CCPC, that is the difference between a balance due 28 February versus 31 March, and getting it wrong costs you a month of interest.
A worked example: mapping one year-end to every date
Take a Kelowna-based manufacturing company, a CCPC with a 30 September fiscal year-end and roughly $420,000 of taxable income (within the small-business limit, claiming the SBD). Here is its full deadline map for the year just ended:
| Obligation | Rule | Date for a Sep 30 year-end |
|---|---|---|
| Tax balance due | 3 months (CCPC + SBD) | 31 December |
| T2 return filing | 6 months after year-end | 31 March (following year) |
| Instalments (if required) | Monthly or quarterly through the year | End of each month / quarter |
Now contrast two cash outcomes.
Scenario A — owner remembers only the filing date. The company finalizes everything for the 31 March filing deadline and pays the $48,000 balance owing at that time. But the balance was due 31 December. That is roughly three months of late payment. At the CRA's prescribed interest rate, compounded daily, the firm pays interest on the full $48,000 for the late quarter — a wholly avoidable expense, plus the interest is not deductible against income.
Scenario B — owner maps both dates. The same company sets aside its estimated tax through the year, pays the $48,000 by 31 December, and files the polished return by 31 March. Interest cost: nil. Same tax, same return, same accountant — the only difference is that the owner treated the payment date and the filing date as two separate obligations on the calendar.
The lesson is not subtle. The cheapest tax planning available to an established BC corporation is simply paying the balance on the balance-due day. You cannot out-earn unnecessary CRA interest.
Do you have to pay instalments during the year?
Possibly. A corporation must generally pay tax in monthly instalments during the year, unless its total taxes payable for either the current or the previous year are $3,000 or less — in which case no instalments are required and the whole amount is simply due on the balance-due day.
Eligible small CCPCs can pay quarterly instead of monthly, which materially eases the administrative and cash-flow burden. To qualify for quarterly instalments you must be a CCPC claiming the small business deduction and meet a clean-compliance test (a perfect filing and remittance record over the prior period, taxable income within the small-business limit). Falling out of good standing pushes you back to monthly instalments — another reason to keep your CRA account spotless.
What does it cost to file late — separate from paying late?
The late-filing penalty for a T2 starts at 5% of the unpaid tax at the filing deadline, plus 1% for each complete month the return is late, up to 12 months. For repeat offenders who were already assessed a late-filing penalty in one of the three prior years and received a formal demand to file, the penalty escalates to 10% plus 2% per month for up to 20 months. These penalties stack on top of the interest you are already paying on the unpaid balance — so a late filer with an unpaid balance is paying two clocks at once.
A simple deadline routine for your business
Build these four checkpoints into your finance calendar the day your year-end closes:
- Estimate the tax early. Within a few weeks of year-end, produce a reasonable estimate of taxes payable so you know the balance-due figure before it is due.
- Pay the balance on the balance-due day — two or three months out, depending on your CCPC/SBD status. Confirm which window applies to you.
- Stay current on instalments. If your prior-year tax exceeded $3,000, set up monthly or (if eligible) quarterly instalments and automate them.
- File the T2 by month six — and keep your filing record clean so you preserve quarterly-instalment eligibility and avoid escalated penalties.
Key takeaways
- T2 filing is due six months after year-end; the tax payment is due earlier — two months, or three for a CCPC claiming the small business deduction.
- The three-month balance-due day requires CCPC status and an SBD claim (current or prior year); otherwise the two-month rule applies.
- Interest runs from the balance-due day, compounds daily, and is not deductible — paying on time is the cheapest planning you can do.
- Instalments are required unless total taxes payable are $3,000 or less; eligible small CCPCs can remit quarterly.
- Late-filing penalties (5% + 1%/month, escalating to 10% + 2%/month) stack on top of interest — filing and paying are two distinct obligations.
In corporate tax, the calendar is not bureaucracy — it is cash flow with a date attached. Know your year-end, mark the two clocks that start from it, and the CRA never gets to charge you for forgetfulness.
If you would like help building a deadline map tailored to your fiscal year-end, or want a fractional CFO to keep your instalments, balances, and filings on a clean and predictable rhythm, RN Canada's advisory team is here to make corporate tax a non-event rather than a fire drill. Get in touch and let us bring order to your calendar.