A month-end close checklist — and why it makes year end cheap

Most owner-managed corporations do not close their months. They record transactions continuously, glance at the bank balance, and treat the year end as the point at which the books become real. That approach works right up until the year end arrives, at which point twelve months of accumulated ambiguity has to be resolved at once by someone who was not there when any of it happened.

What “closing” actually means

A period is closed when three things are true: every account has been reconciled to an external record, every transaction sits in the period it belongs to, and the period has been locked so nothing can be posted into it afterwards. That last step is the one that is almost always skipped, and it is the one that gives the close its value. Without a lock, a transaction dated last March can be added in November, and the March you reviewed is no longer the March in the file — which means your comparatives, your GST/HST returns and your interim numbers all quietly stop agreeing to anything.

The checklist

For a typical owner-managed Canadian corporation, this is a short exercise once it is a habit.

1. Complete the transactions

Import and code everything to the period cut-off, clear the uncategorised account to zero, and enter supplier bills and customer invoices dated in the month even if they were issued later. On the accrual basis the date that matters is when the work happened, not when the paperwork caught up — the distinction is set out in cash versus accrual accounting.

2. Reconcile every account

Each bank account, each credit card, each payment processor, and any loan or lease where a statement exists. The closing balance must agree, and every reconciling item must be explainable. Items outstanding for more than two months are usually errors rather than timing, and this is the step that carries the most weight — see why bank reconciliation matters.

3. Agree the sales tax accounts

The GST/HST collected and input tax credit balances should agree to what your filings say, and the difference between them should be the amount you actually owe or are owed. If the two never agree, one of them is being posted incorrectly, and finding that at month end is far cheaper than finding it during a review of a filed return.

4. Agree payroll

Gross pay, source deductions withheld, and the employer portions should agree to the payroll records, and the remittances made should clear the payable. A balance left sitting in source deductions payable after the remittance date means either the remittance was missed or the entry was wrong, and both are worth knowing about immediately — see payroll remittances and the RP account.

5. Review receivables and payables

Run the aged listings. Chase what is late, investigate credit balances and anything with a negative sign, and note accounts that are drifting toward uncollectible while the evidence is still fresh. This is where receivables management actually happens.

6. Post the recurring adjustments

Amortisation for the month, the current portion of anything prepaid, accrued costs incurred but not yet billed to you, and any inventory movement. These are the entries that separate a book that shows profit from a book that shows cash movement, and doing them monthly means the year-end versions are a check rather than a discovery. Prepaids in particular have a habit of appearing only at year end — see prepaid expenses at year end.

7. Clear the owner accounts

Process the month’s reimbursements against receipts, record any dividends declared, and make sure the shareholder loan balance is a number you recognise. This is the single most effective month-end habit for an incorporated owner, because the shareholder loan is the account that causes the most year-end work when it is left to accumulate.

8. Review, then lock

Read the profit and loss against the prior month and the same month last year, and ask about anything that moved without a reason. Then close the period in the software and set the lock date. Save the reconciliation reports and the aged listings with your records for the period, so the support still exists when someone asks about it later.

Why this makes year end straightforward

The corporate year end is largely an exercise in verification. Where the twelve months are already closed, the year-end work is reviewing balances that have been proven monthly, applying the tax adjustments, and mapping the result to the GIFI codes on Schedules 100 and 125 of the T2 — which is fast when the chart of accounts was built for it. Where they are not, the same work starts with reconstructing what happened, from statements, months after the fact, by someone who has to ask you about every ambiguity.

There is a second payoff that has nothing to do with the CRA. Closed months give you comparatives — this month against last month, this month against the same month last year — and comparatives are the only way monthly figures become useful for decisions. They are also what makes a cash forecast possible, which matters most in a seasonal business.

Making it stick

Put it in the calendar for a fixed working day each month and treat it as a deadline rather than a task. Use the same checklist every time so it becomes mechanical. Keep the annual items on a separate list — the inventory count, the year-end tax review — so the monthly routine stays short enough to actually complete. And if the months have already stacked up, close them in order rather than jumping to the current one, because each closed month is what gives the next one a reliable opening balance. That is precisely how catch-up work is sequenced.

This article is general information for Canadian business owners and is current as of July 2026. It is not tax, legal or accounting advice, and it does not create a client relationship. Tax rules change and your situation is unique — please speak with a CPA before acting on anything here.