Common bookkeeping mistakes Canadian small businesses make

Short answer: Most bookkeeping problems aren’t dramatic — they’re small, ordinary habits that compound quietly until year-end or a GST/HST filing forces the issue. Here are the ones we see most often, and the fix for each.

1. Mixing personal and business expenses

Running personal purchases through the business account (or vice versa) is the single most common mistake. It muddies your reports, complicates tax, and makes GST/HST harder to get right.

The fix: Keep separate business bank and credit-card accounts, and run only business activity through them. If something slips through, record it correctly as an owner draw or contribution.

2. Skipping reconciliation

Assuming the bank feed is “good enough” and never reconciling. The feed can miss transactions and import duplicates — reconciliation is what proves the records match reality.

The fix: Reconcile every account, every month, against the statement. See bank reconciliation explained.

3. Letting the books fall behind

Bookkeeping has no hard deadline day-to-day, so it loses to work that does — until there’s a backlog.

The fix: A fixed monthly rhythm, or hand it off. If you’re already behind, catch-up and cleanup is straightforward once someone sizes it.

4. Miscategorising transactions

Putting transactions in the wrong accounts — or inventing new accounts on the fly — makes reports meaningless and can affect what’s deductible.

The fix: Use a clean, consistent chart of accounts and categorise the same kind of transaction the same way every time.

5. Losing receipts and source documents

No receipt means no support for an expense or an input tax credit — and the CRA can ask for it.

The fix: Capture receipts digitally as you go (tools like Dext attach them to the transaction). Keep records generally for six years — see how long to keep business records.

6. Getting GST/HST wrong

Registering late, charging the wrong provincial rate, or missing input tax credits because receipts weren’t kept.

The fix: Track collected and paid tax through the period and reconcile it. See GST/HST bookkeeping.

7. Ignoring accounts receivable

Not tracking who owes you means slow (or missed) payments and a distorted view of your cash.

The fix: Review outstanding invoices monthly and follow up promptly.

8. Treating the bank balance as profit

Your bank balance isn’t your profit — it doesn’t account for taxes owing, upcoming bills, or money set aside.

The fix: Rely on a reconciled profit-and-loss statement, not the bank balance, to understand how the business is doing.

9. DIY beyond your comfort zone

Doing your own books well past the point where the complexity (payroll, GST/HST, growth) has outgrown your time or confidence.

The fix: Be honest about when it’s time to get help. See do I need a bookkeeper?

The pattern behind all of these

Almost every mistake here traces back to the same thing: bookkeeping that isn’t done consistently and checked. A steady monthly routine — recorded, categorised, reconciled, reviewed — prevents nearly all of them.

If any of these sound familiar, the free Bookkeeping Health Check will show you which areas need attention, or talk to Avora and we’ll help you fix them.

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Last reviewed: August 2026.