Free calculators for incorporated businesses in Canada
Most small-business owners in Canada eventually face the same set of questions: whether to incorporate, how much tax a Canadian-controlled private corporation actually pays, how to take money out of it, and when the Canada Revenue Agency expects to be paid. These Canadian business calculators answer those questions one at a time, with the federal rules applied for you and the reasoning laid out beside every result, so you can see why a number comes out the way it does.
All six calculators are free to use, with no sign-up, and every one runs in your browser. Nothing you enter is sent, stored or shared, which makes it easy to test real figures and compare several scenarios side by side.
Should you incorporate?
The incorporate vs sole proprietor calculator prices one year of net business income twice: once taxed in your own hands with the full self-employed CPP contribution, and once through a corporation that pays tax first and then pays you a dividend sized to the after-tax cash you need to live on. Its headline figure is the tax deferred this year, and it sets that beside the much smaller absolute saving you would see if everything were paid out at once. That gap is the heart of the decision. Canadian tax integration is designed so that income earned through a corporation and paid out attracts roughly the same total tax as income earned personally; the advantage lies in leaving profit inside the company at a low rate until you need it. An advanced field adds the extra annual cost of running a corporation, because leaving it out flatters the comparison.
The corporate tax bill and the small business deduction
Every dollar of active business income in a CCPC is taxed at either the small-business rate or the general rate, and the dividing line is the business limit. Three calculators work on that line from different angles:
- The CCPC corporate tax calculator estimates federal and provincial tax on active income, shows how much falls in each rate band, and puts a dollar value on the small business deduction.
- The small business deduction calculator takes the limit itself apart: the share allocated to this corporation within an associated group, the passive-income grind and the taxable-capital grind computed separately, and the larger of the two applied, since the grinds never stack.
- The passive income grind calculator isolates the cost of investment income held inside the corporation: how much limit it removes, how much active income is repriced to the general rate, and what one more dollar of adjusted aggregate investment income would add.
Two details matter across all three. The grinds look at the associated group’s figures for the prior year, so a large realized gain shows up in the following year’s limit and can be planned for a year ahead. And because provincial corporate rates are set by thirteen governments on their own budget cycles, the calculators that include provincial tax ask you to enter your province’s small-business and general rates rather than relying on a table that could go stale.
Paying yourself: salary, dividends or a mix
The salary vs dividend calculator fixes a slice of pre-tax corporate profit and moves it to the owner twice, so both routes are compared on identical terms. On the salary route the corporation deducts the pay and its share of CPP, and because an owner-manager is both employer and employee, both halves of the contribution come out of the same budget. On the dividend route the corporation pays tax first, and the dividend is grossed up and then relieved by the federal and provincial dividend tax credits, with no CPP payable and no RRSP room created. A mix line stacks salary and dividend on one return, which is where most owners end up, and the calculator reports the RRSP room a salary creates without putting a value on it, since that depends on whether you use it.
Paying the CRA on time
Instalments catch newly profitable corporations more than any other filing obligation. The corporate tax instalment calculator estimates federal tax for the current year, tests whether instalments are required at all and whether the corporation may remit quarterly instead of monthly, and prices the estimate, prior-year and combined bases so you can choose between them. Enter the CRA’s prescribed rate for the quarter and it puts a dollar figure on the interest risk of paying on your own estimate. Provincial corporate tax is not included, so add that layer separately.
Why estimate before you decide
Corporate tax planning rewards looking a year ahead. A realized gain in the corporation this year can shrink next year’s business limit, a year of strong profit can bring instalments the year after, and the choice between salary and dividends affects CPP, RRSP room and even how a mortgage lender reads your income. Seeing the numbers in advance lets you spread realizations, adjust how you pay yourself, or top up instalments before interest builds.
The federal rates, the business limit and the grind thresholds used by these tools are stored as parameters and follow the CRA’s published figures as they change. The calculators give estimates for planning, not tax advice or a filing position: association, specified corporate income, refundable taxes and your full file all affect the real result, so confirm anything material with your accountant or the CRA.
Choosing where to start
- Not yet incorporated: start with the incorporation comparison, then check the corporate tax bill.
- Investments held inside the company: run the small business deduction and passive income grind calculators.
- Planning owner pay for the year: use salary vs dividend.
- Profit rising: check whether instalments apply before the year is out.
Used together, the six calculators follow a dollar of business income from the corporation’s return to your own, which is the clearest way to see where the tax really falls and which decisions are worth revisiting each year.
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