AT1 (Alberta corporate income tax return)

Buyers and sellers of Alberta corporations meet the AT1 as the provincial companion to the federal T2. Alberta Treasury Board and Finance says a corporation with a permanent establishment in Alberta at any time during the taxation year is required to file one, unless it is exempt. This entry covers Alberta only; check the rules where the corporation operates.

Filing and exemptions

Alberta says that for taxation years beginning after December 31, 2024, corporations must file the AT1 and its schedules electronically through Net File, except those listed. Information Circular CT-2 sets criteria for an exemption from filing, all of which must be met, and says a corporation claiming certain tax credits is not exempt. An AT1 is considered filed on the date Alberta receives it.

What to ask

• Whether the corporation had a permanent establishment in Alberta in each year
• Whether an AT1 was filed for every year, or an exemption applied
• Whether the filings were made through Net File

See what tax filings to review before buying and the T2 corporation income tax return.