October Is When Year-End Winners Separate From Year-End Scramblers

The financial decisions that determine whether December 31 feels manageable or overwhelming are all made right now

For Ontario incorporated small business owners, October is the most strategically important month of the year — and the one most consistently wasted. By the time December arrives, many of the decisions that could have reduced a 2026 tax bill are no longer available. This post walks through what smart Ontario business owners do in October: close Q3, review net income projections, make salary and dividend decisions, plan capital purchases, calibrate final instalments, and set up for a clean year-end.

There are two types of Ontario incorporated business owners in October.

1. The first type is sitting down with their bookkeeper right now, looking at nine months of actual results, calculating where their net income will likely land by December 31, and making the adjustments that will determine their tax bill for the year.

2. The second type is telling themselves they will deal with taxes after the holidays.

By April, their outcomes will be completely different — and not because of anything that happens between January and April. Because of what did or didn't happen in October.

This is the post for the first type of business owner. And it is also an invitation for the second type to switch lanes before the window closes.

Why October Is the Real Tax Planning Month

Most Ontario business owners associate tax planning with the period between February and April — the weeks before filing deadlines when they are assembling documents and calling their accountant.

That is not tax planning. That is tax filing. And by then, most of the decisions that could have reduced the bill are already made — or missed.

Real tax planning happens when the year is still open. When a salary payment can still be processed. When a capital purchase can still be made and expensed in the current year. When the salary vs. dividend mix can still be adjusted. When the December 15 instalment can be calculated accurately rather than guessed.

October is the last month when all of those options are still available with enough time to execute them properly. November works too, but with less margin. December is possible, but frantic. January is too late.

Step 1: Close Q3 Before Anything Else

Before any planning conversation is meaningful, Q3 needs to be closed. That means every transaction from July, August, and September has been recorded and reconciled — bank accounts, credit cards, HST accounts, payroll records.

Without closed Q3 books, any projection of where your net income lands by December 31 is guesswork. And decisions made on guesswork — salary adjustments, dividend declarations, capital purchase timing — can produce the wrong outcome even when made with the best intentions.

If your Q3 is not closed, that is the first job. Everything else in this post follows from that foundation.

Step 2: Project Your 2026 Net Income

With Q3 closed, you have nine months of actual results. From there, projecting where the year lands is a combination of what you know about Q4 pipeline and what Q4 typically looks like historically.

The projection does not need to be precise to be useful. An estimate within 10 or 15 percent is sufficient to make the planning decisions below meaningful. What you are trying to answer is a simple question: will this year's net income be significantly higher, lower, or roughly the same as last year?

The answer to that question drives everything that follows.

Step 3: The Salary vs. Dividend Decision

For Ontario CCPC owners, how you pay yourself — through salary, dividends, or a combination — is the most impactful compensation decision you make every year. And it is a decision that requires a meaningful projection of your current net income.

Salary reduces corporate taxable income and creates personal CPP contributions and RRSP room. Dividends are paid from after-tax corporate earnings and are taxed differently in your hands — with no CPP and no RRSP room.

The optimal mix depends on your personal marginal tax rate, your corporation's projected net income, your RRSP room, and your CPP objectives. Your accountant is the right person to model this — but they need your current numbers to do it accurately.

October is the last comfortable moment to make this decision, process a salary adjustment if needed, and have it affect the 2026 tax year. Leave it until December, and the window for implementation narrows significantly.

Step 4: Capital Purchase Timing

If your business has planned any capital purchases — equipment, technology, vehicles, leasehold improvements — October is the time to decide whether they go in before December 31 or wait until 2027.

Under CRA's half-year rule, most depreciable assets acquired in any year are eligible for only half of the normal Capital Cost Allowance rate in the year of acquisition, regardless of when in the year the purchase was made. Buying equipment on October 15 and buying it on December 28 produces the same first-year deduction.

What matters is whether the purchase goes into 2026 or 2027. If your 2026 net income is higher than expected and a capital purchase could have been made anyway, putting it into 2026 may accelerate the deduction by a full year. If your 2026 income is lower than expected, the deduction may be more valuable in 2027.

This decision requires knowing your projected net income, which requires closed Q3 books. October is when this decision is manageable. December is when it becomes frantic.

Step 5: Calibrate Your December 15 Instalment

December 15 is the fourth and final quarterly personal income tax instalment for 2026. For self-employed Ontario business owners and those receiving income outside of payroll, this payment is the last chance to reduce the balance owing on April 30, 2027.

CRA allows three methods for calculating instalment amounts. The most accurate — and the one that produces the lowest April balance — is based on an estimate of your actual current-year tax. With nine months of real income data and a reasonable Q4 projection, this estimate can be calculated with meaningful accuracy in October.

An accurate December 15 instalment means a smaller April surprise. A guessed instalment means either overpaying (money sitting with CRA at zero interest) or underpaying (interest compounding from December 15 onward).

Step 6: Set Your Accountant Up for a Clean Year-End

The condition of your books at December 31 determines how smooth — and how expensive — your year-end accounting engagement will be. Accountants who receive clean, organized, fully reconciled files complete their work faster, charge less, and produce more accurate returns.

October is when you can identify the bookkeeping gaps that will slow your accountant down in the spring. Outstanding reconciliations, uncategorized transactions, missing receipts, unclear shareholder loan balances — all of these are fixable in October and November. They are disruptive and expensive to fix in February when your accountant is waiting for the file.

The October Bookkeeping Checklist

1. Close Q3: all accounts reconciled through September 30.

2. Project 2026 net income with your bookkeeper.

3. Review salary vs. dividend mix with your accountant — book the meeting now.

4. Decide on any capital purchases before December 31.

5. Calculate your December 15 instalment.

6. Identify and fix any bookkeeping gaps before year-end.

7. Confirm your shareholder loan balance and repayment timeline.

8. Review passive income year-to-date if approaching the $50,000 threshold.

Working With Metarithmika

Metarithmika works with Ontario-incorporated businesses to maintain the current, monthly bookkeeping that makes every item on this list possible. October planning conversations are a standard part of what we do for every client — not an exception.

If you are heading into Q4 without current books, the planning described above is not available to you. That is the most direct argument for getting your books current before October is over.

Official CRA sources:

canada.ca — Small business deduction;

canada.ca — Corporation payments and instalments

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