Bookkeeping mistakes with potentially costly fixes.
- K. McLaren CPA, CGA

- Sep 28
- 2 min read
Bookkeeping isn’t always the most exciting part of running a business. But here’s the truth: ignoring it, or getting it wrong, can end up costing you a lot more than just time.
We’ve seen small mistakes snowball into expensive clean-up jobs that business owners never planned for. Here are some common bookkeeping mistakes that individuals and small businesses often make:
🔢 1. Mixing Personal and Business Finances
Using the same bank account or credit card for both personal and business expenses.
Makes tracking business finances and tax filing difficult.
📅 2. Not Keeping Books Up-to-Date
Delaying data entry or reconciliation can lead to forgotten transactions and errors.
Leads to inaccurate financial reporting.
🧾 3. Missing Receipts or Documentation
Not saving receipts or backup for expenses.
Makes audits, tax deductions, and verifying transactions harder.
🧮 4. Incorrectly Categorizing Transactions
Misclassifying income or expenses (e.g., treating an asset purchase as an expense).
Affects financial reports and tax liabilities.
💳 5. Failing to Reconcile Bank and Credit Card Statements
Not matching bookkeeping records with actual bank/credit card statements.
Can hide discrepancies, fraud, or missed entries.
🗂️ 6. Not Tracking Accounts Receivable/Payable
Forgetting to track who owes you money (or what you owe).
Can lead to cash flow problems or missed payments.
🧑💻 7. Manual Errors in Data Entry
Typing mistakes, duplications, or omissions.
Can skew reports and lead to poor business decisions.
📊 8. Ignoring Financial Reports
Not reviewing income statements, balance sheets, or cash flow reports.
Misses trends, red flags, or areas for improvement.
📆 9. Not Backing Up Data
If using software without backup, losing data due to technical failures.
Leads to permanent loss of financial records.
🧾 10. DIY Bookkeeping Without Knowledge or Support
Trying to handle everything without understanding accounting basics.
Leads to compounding errors, especially around taxes or compliance.
✅ Tips to Avoid These Mistakes:
Use accounting software (like QuickBooks, Xero, or Wave).
Set a weekly schedule for bookkeeping tasks.
Keep receipts and digitize them.
Separate business and personal finances.
Work with a professional bookkeeper or accountant periodically.

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