December is when tax planning collapses from a year-long discipline into a deadline. The decisions you can still make before December 31 are consequential; the ones you wish you had made in January are not. For Alberta owner-managers and finance leaders, 2025 introduced two structural changes that make this year's year-end review more complex than usual — and more rewarding if you work through it deliberately.
The first is Alberta's new 8% personal income tax bracket, effective January 1, 2025, which reshapes the salary-versus-dividend calculus for owner-managed corporations. The second is the e-filing mandate on Alberta's own corporate return — the AT1 — which applies to the first taxation years beginning after December 31, 2024. For a December 31, 2025 fiscal year, this is the year your company is filing its first mandatory e-file AT1.
What changed on January 1, 2025: the new 8% personal bracket
Prior to 2025, the lowest Alberta personal income tax rate was 10%, applied on the first bracket of provincial income. As part of Budget 2025, Alberta introduced a new 8% rate on approximately the first $60,000 of Alberta personal taxable income, effective January 1, 2025. The bracket threshold is indexed after 2025, subject to a maximum 2% annual indexation rate.
The saving for an individual earning at least $60,000 in Alberta personal income is up to approximately $750 in reduced provincial tax for 2025 relative to what the prior 10% rate would have produced on that first bracket.
That might sound modest in isolation. But for an owner-manager who draws a salary from their corporation, this bracket directly affects the optimal salary-versus-dividend decision. The 8% rate on the first ~$60,000 of personal income means the effective combined federal-provincial marginal rate at lower salary levels is now slightly more favourable in Alberta than it was the prior year. The exact breakeven between salary and dividends depends on the corporation's income level, whether the small business deduction (SBD) applies, and the individual's total income — but the general direction is that modest salaries up to the $60,000 range have become marginally more tax-efficient for Alberta owner-managers in 2025.
The bracket also changes bonus-timing decisions. If an owner-manager's personal income for 2025 is likely to come in below $60,000 in taxable income, paying a December bonus that brings income up toward but not past that threshold takes advantage of the 8% rate. Letting income sit above the 8% band and land in the 10% bracket above it means forgoing the benefit unnecessarily.
The AT1 and the T2: two separate returns, two separate systems
This point deserves explicit treatment because it is one of the most consistently misunderstood aspects of operating a corporation in Alberta.
Alberta corporations file two separate corporate income tax returns:
- The federal T2, filed with the Canada Revenue Agency (CRA), reporting federal corporate income tax.
- The AT1, filed with Alberta Tax and Revenue Administration (TRA), reporting Alberta corporate income tax.
These are distinct documents administered by distinct government bodies. The T2 is the federal return; the AT1 is Alberta's own return under the Alberta Corporate Tax Act (ACTA). Provincial credits specific to Alberta — including the Innovation Employment Grant (IEG) and the Agri-Processing Investment Tax Credit (APITC) — are claimed on the AT1, not on the T2. Alberta's small business deduction, Alberta's corporate rate structure (8% general / 2% SBD on the first $500,000 of active business income), and Alberta's own loss carryforward rules are all administered through the AT1 system.
For taxation years beginning after December 31, 2024, the AT1 must be filed electronically using Alberta TRA's net file service. There is no paper option for those years. Corporations that fail to file electronically as required are liable to a $1,000 penalty. The mandate applies regardless of gross revenue size — the prior exception for corporations below a revenue threshold has been removed.
For a corporation with a December 31, 2025 year-end, the first AT1 that must be e-filed is the one for the 2025 taxation year. If your tax preparer has been filing the AT1 on paper, confirm now that the workflow has been updated to use net file. This is an administrative detail that can generate a penalty without any tax owing if it is overlooked.
A December 31 checklist for Alberta owner-managers
What follows is a dual-lens checklist — one eye on the federal T2 filing, the other on the Alberta AT1. Not every item applies to every corporation; the point is to force the review before the year closes.
Salary and remuneration decisions
The salary-versus-dividend decision must be made before December 31. Bonuses accrued by December 31 are deductible in the current corporate year if paid within 179 days of year-end. If the goal is to bring personal income to the top of the 8% bracket (~$60,000), the December salary or bonus adjustment is the lever. Dividends paid in January belong to the 2026 personal tax year and cannot substitute.
Capital dividend account
If your corporation realized capital gains in 2025, the non-taxable half accumulates in the capital dividend account (CDA). A capital dividend can be paid to shareholders tax-free. Review the CDA balance before year-end — a positive balance is free money to the shareholder if deployed before December 31.
SR&ED and IEG expenditures
The federal SR&ED enhanced credit limit is now $6 million for tax years beginning on or after December 16, 2024, and Alberta's IEG is claimed on AT1 Schedule 29. Eligible R&D expenditures incurred before December 31 count toward the current year. If 2025 qualifying spend exceeds the prior two-year average, you capture the 20% IEG rate on the incremental portion — timing expenditures before year-end can shift the recovery profile materially.
Capital cost allowance and SBD
CCA is discretionary; maximize it in a profitable year to defer tax, preserve it in a loss year for future use. If your group has multiple associated corporations, the Alberta SBD limit ($500,000 across the entire associated group) must be allocated on the AT1 before filing — the default equal-split may not be optimal for your structure.
AT1 e-file workflow
Confirm with your tax preparer that the 2025 AT1 will be submitted via Alberta TRA's net file service. There is no paper option for taxation years beginning after December 31, 2024. A $1,000 penalty applies regardless of whether any tax is owing.
The interplay between the two returns
For an Alberta corporation, T2 and AT1 filing deadlines are the same: six months after year-end (June 30, 2026 for a December 31 year-end). Installments, however, flow through two separate channels — federal to CRA, Alberta to TRA — and interest accrues independently on each. An amended or reassessed T2 also requires a corresponding AT1 amendment; income adjustments and loss carrybacks do not automatically flow through to the provincial return.
Key takeaways
- Alberta's new 8% personal income tax bracket on approximately the first $60,000 of provincial taxable income, effective January 1, 2025, creates up to ~$750 in annual provincial tax savings and modestly shifts the salary-versus-dividend calculus for owner-managers.
- The AT1 is a separate return from the federal T2, administered by Alberta TRA — provincial credits (IEG, APITC) are claimed only on the AT1.
- Mandatory e-filing of the AT1 applies to taxation years beginning after December 31, 2024; a $1,000 penalty applies to non-compliant corporations.
- December 31 decisions with live tax impact include: salary/bonus timing to capture the 8% bracket, capital dividend elections, SR&ED and IEG expenditure acceleration, CCA maximization, and RRSP room management.
- A T2 amendment or reassessment should always be checked for its AT1 impact — the two systems do not automatically synchronize.
Year-end tax planning in Alberta has always involved two filings. The new 8% bracket and the e-file mandate mean both deserve more deliberate attention than in prior years.
RN Canada Accounting & Advisory works with Alberta owner-managed corporations on year-end remuneration planning, AT1 coordination, and the dual federal-provincial filing workflow. If you want a structured review before December 31, our team is available to work through the numbers with you.