Understanding Canadian corporate tax rates in 2025 is essential for business owners who want to minimize their tax burden and plan strategically. Whether you operate a small incorporated business or a larger corporation, the rate your company pays depends on a combination of federal rules, provincial rates, and eligibility for key deductions like the Small Business Deduction. This guide breaks down everything you need to know — from the federal base rates to a province-by-province comparison — so you can make informed decisions about your corporate structure.
Canada's federal corporate income tax system uses a two-tier structure. The general federal corporate tax rate is 15% and applies to most active business income earned by Canadian corporations. However, Canadian-Controlled Private Corporations (CCPCs) that qualify for the Small Business Deduction (SBD) benefit from a significantly reduced federal rate of 9% on the first $500,000 of active business income each year.
That difference — 9% versus 15% — represents a substantial tax saving for small business owners. On the full $500,000 small business limit, the federal saving alone is $30,000 per year. This is one of the most powerful tax advantages available to incorporated Canadian small businesses, and maintaining eligibility for it should be a priority in any corporate tax planning strategy.
The Small Business Deduction reduces the federal corporate tax rate from 15% to 9% on qualifying active business income. To be eligible, a corporation must meet several criteria:
The SBD also phases out for larger CCPCs based on taxable capital employed in Canada. When a CCPC's (combined with associated corporations) taxable capital reaches $10 million, the small business limit begins to reduce. It phases out completely once taxable capital reaches $50 million. This means mid-sized businesses with significant capital bases may lose access to the reduced small business rate even if they are otherwise structured as CCPCs.
Since 2019, there is an additional rule that can erode your Small Business Deduction based on how much passive investment income your corporation earns. If a CCPC (including associated corporations) earns more than $50,000 in passive investment income in the prior taxation year, the small business limit begins to phase out. For every $5 of passive income above the $50,000 threshold, the small business limit is reduced by $1. When passive income reaches $150,000, the small business limit is reduced to zero and the full 9% federal SBD is lost.
This rule has significant implications for incorporated business owners who have accumulated investment assets inside their corporation. A holding company with a large investment portfolio can inadvertently cause the operating company to lose its SBD eligibility, resulting in a tax rate increase on business income from 9% to 15% federally. Proactive planning — including reviewing inter-corporate structures and timing of passive income — is essential to protect SBD eligibility.
When a CCPC earns investment income — such as interest, foreign dividends, or taxable capital gains — it is subject to an elevated tax rate. However, Canada's tax system includes a refund mechanism to prevent double taxation through the Refundable Dividend Tax on Hand (RDTOH) account.
In essence, the corporation pays a higher upfront tax on passive investment income, but a portion of that tax is refundable to the corporation when it pays taxable dividends to its shareholders. The refund rate is $38.33 per $100 of eligible dividends paid (eligible RDTOH) or $38.33 per $100 of non-eligible dividends paid (non-eligible RDTOH), depending on the source of income.
This mechanism is closely tied to the tax integration principle: the Canadian tax system is designed so that earning income through a corporation and then distributing it as dividends to a shareholder results in approximately the same total tax burden as if the individual had earned the income directly. Integration is never perfect, but it ensures the corporate structure does not create a permanent tax disadvantage for investment income — just a deferral difference for active business income.
Corporate tax in Canada is levied at both the federal and provincial levels. The combined rate a corporation actually pays is the sum of both. Each province sets its own general and small business rates, creating meaningful differences across the country. Here is a province-by-province comparison of combined 2025 rates:
| Province | Combined General Rate | Combined Small Business Rate |
|---|---|---|
| Alberta | 23% | 11% |
| British Columbia | 27% | 11% |
| Ontario | 26.5% | 12.2% |
| Saskatchewan | 27% | 9% |
| Manitoba | 27% | 9% |
| Quebec | 26.5% | 12.2% |
| Nova Scotia | 31% | 14% |
Alberta levies a provincial general corporate tax rate of 8% and a provincial small business rate of 2%. When combined with the federal rates, Alberta corporations pay a combined rate of 23% on general income and just 11% on small business income — the lowest combined small business rate of any province in Canada.
For a Calgary-based CCPC earning $500,000 of active business income and qualifying for the full SBD, the combined federal-provincial tax bill is approximately $55,000 at the 11% rate. The same corporation in Nova Scotia would owe approximately $70,000 at 14% — a $15,000 annual difference simply due to province of incorporation and operation. Alberta's competitive corporate tax environment is a genuine advantage for business owners, and it is one of the reasons many entrepreneurs choose to incorporate provincially here rather than relocating operations.
The team at Swift Accounting Calgary works with incorporated businesses across Alberta to ensure they are taking full advantage of the province's favourable corporate tax rates and structuring their affairs to maintain SBD eligibility year after year.
A common question from business owners is whether incorporating is worth it from a pure tax perspective. The answer lies in the integration principle. For active business income taxed at the small business rate, incorporating in Alberta creates a meaningful tax deferral advantage: the corporation pays 11% now, and the remaining income can be retained inside the corporation for reinvestment. Personal tax is only triggered when the owner draws salary or dividends.
For investment income, integration ensures that the overall tax paid through a corporate structure is roughly equivalent to earning it personally — the RDTOH mechanism and dividend tax credits are designed to equalize the burden. This means incorporation is most advantageous when you do not need to extract all corporate profits personally each year and can benefit from deferring personal tax while retaining funds inside the corporation.
Salary versus dividend mix, holding company structures, and inter-corporate dividends are all strategies that interact with these rates. Getting the balance right requires ongoing planning, not just annual compliance — and that is where working with a knowledgeable accounting firm makes a material difference.
Swift Accounting helps Calgary business owners navigate these decisions with clarity, from initial incorporation through to exit or succession planning.
Alberta corporations pay a provincial general corporate tax rate of 8% and a small business rate of 2%. Combined with the federal rates, this results in a 23% combined rate on general income and 11% on the first $500,000 of active business income for eligible CCPCs — the lowest combined small business rate in the country.
There are two phase-out mechanisms. First, if a CCPC and its associated corporations have taxable capital between $10 million and $50 million, the $500,000 small business limit is proportionally reduced. Second, if passive investment income earned in the prior year exceeds $50,000, the small business limit phases out at $1 for every $5 of passive income above that threshold, disappearing entirely at $150,000 of passive income.
Yes, particularly at the small business level. Alberta's combined small business corporate tax rate of 11% is lower than every other major province. For a business earning $500,000 of active income and fully eligible for the SBD, incorporating in Alberta rather than Nova Scotia (14%) saves approximately $15,000 per year in corporate tax. At the general rate, Alberta's 23% compares favourably to rates of 26.5%–31% in other provinces.
Refundable Dividend Tax on Hand (RDTOH) is a CRA mechanism that tracks tax paid by a corporation on passive investment income. Because investment income inside a corporation is taxed at a high rate (over 50% in Alberta), RDTOH ensures the corporation receives a partial tax refund — $38.33 per $100 of dividends paid — when it distributes those earnings to shareholders. This supports the tax integration principle and prevents permanent double taxation of investment income flowing through a corporate structure.
Corporate tax planning is not a once-a-year exercise — it requires monitoring passive income thresholds, reviewing associated corporation structures, and timing distributions to optimise both corporate and personal tax outcomes. If you are unsure whether your corporation is structured to take full advantage of Canada's 2025 corporate tax rates, we can help.
Contact Swift Accounting today to schedule a corporate tax planning consultation and ensure your business is making the most of Alberta's favourable tax environment.
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