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

Most owner-managed corporations do not close their months. They record transactions, check the bank balance, and treat the year end as when the books become real. That works until the year end, when twelve months of ambiguity must be resolved at once by someone who was not there.

What “closing” actually means

A period is closed when every account is reconciled to an external record, every transaction sits in its period, and the period is locked so nothing can be posted into it. The lock is almost always skipped, yet it gives the close its value. Without it, a transaction dated last March can be added in November, and your comparatives, GST/HST returns and interim numbers quietly stop agreeing.

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 cut-off, clear the uncategorized account to zero, and enter bills and invoices dated in the month even if issued later. On the accrual basis, the work date matters, not the paperwork date — see cash versus accrual accounting.

2. Reconcile every account

Each bank account, credit card, payment processor, and any loan or lease with a statement. The closing balance must agree and every reconciling item must be explainable. Items outstanding over two months are usually errors, not timing. 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 and employer portions should agree to payroll records, and remittances should clear the payable. A balance left after the remittance date means a missed remittance or a wrong entry. 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 dividends declared, and make sure the shareholder loan balance is a number you recognize. Left to accumulate, it causes more year-end work than any other account.

8. Review, then lock

Compare profit and loss with last month and the same month last year, and question anything that moved without a reason. Then close the period and set the lock date. File the reconciliation reports and aged listings with the records for the period.

Why this makes year end straightforward

The corporate year end is mostly verification. With twelve closed months, it means reviewing proven balances, applying tax adjustments and mapping to the GIFI codes on Schedules 100 and 125 of the T2, which is fast when the chart of accounts was built for it. Otherwise it starts with rebuilding the year from statements, with a question for you on every ambiguity.

Closed months have a second payoff beyond the CRA: comparatives — this month against last month and against the same month last year. Comparatives make monthly figures useful for decisions, and they make a cash forecast possible, which matters most in a seasonal business.

Making it stick

Book a fixed working day each month and treat it as a deadline. Use the same checklist every time. Keep annual items, such as the inventory count and year-end tax review, on a separate list so the monthly routine stays short. If months have stacked up, close them in order, because each closed month gives the next a reliable opening balance. That is 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, so please speak with a CPA before acting on anything here.