Should you incorporate? What a corporation saves, defers and costs at your profit

What incorporating actually moves

A sole proprietor and their business are the same taxpayer, so every dollar of profit lands on a personal return whether it reaches the owner’s chequing account or not. A corporation is a separate taxpayer that owns the business, files its own return and pays the owner. Profit left inside the corporation bears the corporate rate and nothing else until the day it comes out.

That gap between the corporate rate and your own personal rate is the whole mechanism. It isn’t a discount, because the second layer of tax arrives whenever you take the money out, and the two layers together come to roughly what a proprietor pays on the same profit. What incorporating buys is time: the second layer waits, and the money that would have gone to the CRA this year keeps working.

So the number that decides this is the profit you can leave behind, i.e. what the business makes less what your household spends. The calculator asks for both, works backwards from your living costs to the dividend that funds them, and shows what is left inside the corporation once corporate tax and your own tax have been paid.

Why the yearly saving is smaller than it looks

The headline figure is tax you don’t send the CRA this year, and it is a delay rather than a discount. The integration rows under it take the same profit all the way out in the same year and total the tax both ways, with CPP left out of the proprietor’s side. The two totals land close together, and which one is larger depends on the province and the profit.

Integration is the name for the design that puts the two totals so close together. A dividend bears less personal tax than the same cash paid as salary or earned as a proprietor, because the corporation has already paid corporate tax on it once, and the dividend tax credit on your return hands back an approximation of that corporate tax. The approximation isn’t exact, and where it misses, the miss goes in either direction depending on the province.

The cash comparison flatters incorporating for a reason that is worth naming out loud. A proprietor pays both halves of the Canada Pension Plan contribution on business profit and a dividend carries none, so most of the cash gap, and sometimes more than all of it, is a pension you stop buying rather than tax you stop paying. As such the calculator compares tax with CPP left out, states what the CPP costs once its own tax relief is counted, and says how much of the break-even running cost is CPP rather than tax. At a low profit the comparison also runs the other way, because a proprietor earns the Canada workers benefit and a dividend never does, so the cash rows count it and the tax rows leave it out.

What the corporation costs, and what it deducts

A corporation files its own T2 return every year, even in a year it earned nothing, and behind that return sits a second set of books and a short annual filing with the registry it was incorporated in (e.g. Corporations Canada, or your province’s own). Somebody has to be paid to do all three, and that bill doesn’t pause in a bad year. The calculator asks you for the figure rather than assuming one, because a fee is an answer to your own file rather than a rate.

The corporation deducts what it pays for that work, so a dollar of running cost costs less than a dollar once the corporate tax it saves is counted. The calculator keeps that saving with the bill rather than calling it a tax saving from incorporating. Every tax comparison is made on the same profit before the running cost, and the bill, after the tax it saves, comes out of what stays inside, or out of your dividend when nothing does. The calculator also charges the whole bill to the incorporated route, which is slightly harsh on it: a proprietor who already pays somebody to prepare a business schedule is paying part of that money either way.

The second figure worth reading twice is the profit the corporation needs before anything stays inside it. Below that figure the dividend that funds your living costs takes everything the corporation has after tax, the deferral is zero, and the running cost buys you nothing but limited liability and a filing obligation.

Three reasons to incorporate that have nothing to do with the rate

A realistic sale inside the next few years is the strongest of them. The lifetime capital gains exemption shelters a large slice of the gain on a sale of shares in a qualifying corporation, and a sole proprietorship has no shares to sell. The qualifying tests run on a twenty-four month clock, so an owner who might sell is buying the clock rather than the rate.

Real liability is the second of them, and it arrives sooner than most owners expect. Once there are employees, a lease, inventory or work that could injure somebody, limited liability means creditors normally reach the corporation’s assets rather than your house. The protection has holes worth knowing: it doesn’t cover debts you personally guaranteed, your own negligence, or payroll deductions and GST/HST the corporation collected and never sent on.

The third is a client or a professional regulator that insists on a corporation. Where the client is the one insisting, that is exactly the pattern CRA reviewers look for, so run the personal services business conditions first (e.g. whether you would be that client’s employee without the corporation in the middle) and price in the higher rate if they apply to you.

What this calculator leaves out

Profit above the small business limit of $500,000 bears the general corporate rate, and the calculator splits profit at the limit and prices both slices. Profit taxed at the general rate feeds a general rate income pool, which grows by 72% of it each year, and a dividend the corporation designates out of that pool is an eligible one with a larger credit and a larger gross-up. The calculator prices eligible dividends up to the pool when you say the corporation designates them, from this year’s addition and any balance you enter; eligible dividends received and investment income, which also move the pool, are left out. Investment income inside the corporation also grinds the limit down from the year after it is earned, and that belongs to the corporate tax calculator.

Four things sit outside the arithmetic on the personal side. Income splitting with a spouse or an adult child is left out, because the tax on split income taxes an unreasonable share at the top rate and the reasonableness test turns on facts a calculator can’t see. The lifetime capital gains exemption, the Canada Child Benefit and alternative minimum tax are left out for the same reason, which is that each of them turns on more than the profit and the province. The Canada workers benefit is in the figures for one person with no spouse or dependant, since a proprietor’s profit earns up to $1,665 of it in 2026 and a dividend earns none.

Two costs of incorporating are named nowhere in the figures. Registering the corporation costs a fee that differs in every province, and your CRA business number closes and reopens, so the GST/HST and payroll registrations a proprietor already had don’t carry over. Neither is large next to the annual running cost, and both land in the first year rather than every year.

The full argument, including what changes the day you incorporate and the three situations that justify incorporating early, sits in the guide this calculator was built from. Should you incorporate covers it, and the owner-operator version runs the same question for a driver a carrier wants incorporated.

Three worked examples

To provide an example, take the owner our incorporating guide works its own arithmetic on: an Ontario business making $140,000 of profit, whose household spends $80,000 a year.

The corporation pays $16,374 of corporate tax at 11.7%, then a dividend of $90,239 to leave $80,000 in the owner's hands, which costs another $10,239 of personal tax. The corporation keeps $33,387 inside, and $7,395 of tax isn't paid for 2026. Staying a proprietor would cost $34,008 of tax plus $9,292.90 of CPP on the same profit, so the guide's rough $60,000 left over is really $33,387 once both layers of tax are counted.

The same guide sets a second owner beside the first, on more profit and a great deal more spending, and the calculator is harsher about that one than the guide is.

At $180,000 of profit against $170,000 of spending, the corporation needs $271,594 of profit before anything stays inside it, so it pays out everything it has after tax and still leaves the owner with $124,497. Nothing is deferred, $0 stays behind, and incorporating costs $3,753 more in tax for 2026 than staying a proprietor.

The third example keeps the spending where it was and raises the profit, which is the only change that makes the corporate rate worth anything.

Raising the profit to $250,000 on the same $80,000 of spending leaves $130,521 inside the corporation and defers $46,347 of tax for 2026. Take the whole of that profit out in the same year instead and, with CPP left out, a proprietor pays $89,472 of tax against the incorporated route's $90,136, which is the difference between a delay and a discount.

At what profit does incorporating start to pay?

Each row takes the same $80,000 of household spending in Ontario, runs both routes at a different profit for 2026, and reports what stays inside the corporation once you have been paid. The running cost is left at nothing. A running cost wouldn’t move the three tax columns, which compare both routes on the same profit. It would come out of the last column after the tax it saves, or out of your dividend where that column is already nothing, and it would raise the profit where anything first stays inside by the whole bill.

The pattern the rows show is the one the guide argues for. Below the point where profit covers the dividend your living costs need, there is nothing to leave inside and incorporating costs more tax this year than it saves. Above it the deferral grows quickly, because every extra dollar of profit is a dollar taxed at the corporate rate and no other.