Alberta Corporate Tax Payment: Where It Goes, When It’s Due and How to Pay

Most Canadian corporations deal with one tax authority. An Alberta corporation deals with two. The federal portion goes to the Canada Revenue Agency, but Alberta collects its own provincial corporate income tax through Tax and Revenue Administration (TRA), a branch of the Alberta government. That split is the source of most problems with an Alberta corporate tax payment, and it is worth getting right before your next balance or instalment falls due.

In most provinces, the CRA collects provincial corporate tax along with the federal tax on a single T2 return. Alberta is different. A corporation with a permanent establishment in Alberta at any time during the year files a separate Alberta return, the AT1, with TRA, and pays the Alberta portion of its tax directly to TRA.

The federal T2 still goes to the CRA, and federal tax is still paid to the CRA. So an Alberta corporation has:

• Two returns: the T2 (federal) and the AT1 (Alberta)
• Two payment streams: federal tax to the CRA, Alberta tax to TRA
• Two account numbers: the CRA business number, and the Alberta Corporate Account Number (CAN) or Business Identification Number (BIN)

Alberta taxable income is calculated in a way that parallels the federal calculation, but the two are not identical. Discretionary deductions such as capital cost allowance can be claimed differently for Alberta and federal purposes.

This is the mistake that costs Alberta business owners the most. If the Alberta portion of your tax is paid to the CRA by error, Alberta’s own guidance says there is no process for transferring it to TRA.

From Alberta’s point of view, the tax is still unpaid. Interest keeps running on the Alberta balance while you sort out a refund or credit from the CRA side. The fix is simple: treat the Alberta payment as a separate bill, to a separate payee, every time.

The AT1 return is due within six months of the end of the corporation’s tax year. The payment is due earlier.

A Canadian-controlled private corporation (CCPC) gets the extra month if it meets any one of these:

• It claims the Alberta small business deduction and has taxable income of $500,000 or less in the current year
• It claimed the deduction with taxable income of $500,000 or less in the prior year
• Its tax payable for the year, or its first instalment base, is $2,000 or less

So a CCPC with a December 31 year-end that qualifies has until March 31 to pay its Alberta balance, but until June 30 to file the AT1. Filing late is a separate problem from paying late, and owners who wait for the filing deadline to pay often end up with an interest charge they did not expect.

Alberta tax is paid in equal monthly instalments through the year.

Many small corporations do not have to pay instalments at all. A CCPC is exempt if it meets the same three conditions that earn the extra month above. A corporation that is not a CCPC is exempt if its tax for the year, or its first instalment base, is $2,000 or less. A new corporation does not pay instalments in its first year, unless it was formed by an amalgamation.

Missed or short instalments are not ignored. Daily compound interest applies to any late or deficient payment of Alberta tax. TRA can waive or cancel penalties and interest when circumstances outside your control prevented you from paying, and that request goes through TRA’s online system, TRACS.

There are several ways to pay Alberta corporate tax, and they do not all credit your account at the same speed.

Whichever method you use, put your Corporate Account Number (CAN) or BIN on the payment. Alberta’s own example for a cheque memo is “CAN 212345678 Corporate Tax Period 2026/12/31”. A payment without one gets held up in processing.

Two practical points. If you pay by credit card or at Canada Post, pay at least three business days before the due date. And if you mail a cheque, TRA uses the date it receives the payment for interest, not the date you posted it.

If your corporation pays at the bank counter with a paper TRA remittance advice, that option is closing. Alberta says requests for remittance advices end on October 31, 2026, and from December 1, 2026, banks will no longer accept paper-based remittances.

That makes the next few weeks a good time to set up online payment, especially for any corporation with a balance or instalment falling due in December or January.

For tax years that began after December 31, 2024, most corporations must file the AT1 electronically, through certified tax software. No access code or registration is needed to net file. A corporation that is required to file electronically and files on paper instead faces a $1,000 penalty.

A few types of corporation are excluded from mandatory electronic filing, including insurance corporations and non-resident corporations.

What you pay depends on Alberta’s two corporate rates: a 2% small business rate on qualifying active business income and an 8% general rate on everything else. Our guide to the Alberta corporate tax rate explains how those rates apply, and the BC corporate tax rate post shows how the same income would be taxed next door, where the general rate is higher and the CRA collects the provincial tax.

An Alberta corporation is really running two tax calendars at once, with different payees, different account numbers and, for many owners, different due dates for filing and payment. Most problems come from treating them as one, and a missed Alberta corporate tax payment usually starts there.

Your Modern Accountant prepares the T2 and AT1 together for corporations across Alberta and the rest of Canada, and keeps the payment dates for both in view. If you are in Calgary, Edmonton or elsewhere in the province, our Alberta tax services page covers how we work with Alberta businesses, and our corporate tax filing services handle both returns from one set of books.