10 Common Bookkeeping Mistakes Small Businesses Make (and How to Fix Them)
Most bookkeeping problems don’t start with a big error. They start with a small habit — a skipped reconciliation, a personal purchase on the business card, a bank-feed transaction accepted without a second look — that compounds month after month until the profit and loss statement stops making sense. Below are the ten mistakes we see most often when US and Canadian small businesses come to us for a bookkeeping cleanup, plus how to prevent each one.
1. Not reconciling bank and credit card accounts every month
Reconciliation is the only step that proves your books match reality. Without it, duplicates, missing transactions and incorrect opening balances can sit unnoticed for months. If your accounting software shows a bank balance that doesn’t match your statement, every report built on it is unreliable.
Fix: reconcile every bank, credit card, loan and payment-processor account to the month-end statement within the first two weeks of the next month. Our step-by-step guide shows how to reconcile a bank account in QuickBooks Online.
2. Mixing personal and business transactions
Paying for groceries with the business card, or a supplier invoice from a personal account, makes it hard to see true business profit and creates extra work at year-end. It can also weaken the separation between you and your business entity.
Fix: use dedicated business bank and card accounts. When a personal transaction slips through, record it as an owner draw or owner contribution — not as an expense.
3. Accepting bank-feed transactions without reviewing them
Bank rules and auto-categorization save time, but they also repeat mistakes at scale. A rule that codes every Amazon purchase to “Office supplies” will misclassify inventory, equipment and personal purchases alike.
Fix: review rules quarterly, and look at the “For review” queue before accepting. Large or unusual amounts deserve a receipt and a second look.
4. Creating duplicate transactions
Duplicates usually happen when a transaction is entered manually (an expense, bill payment or invoice payment) and then the same transaction is added from the bank feed instead of matched. Integrations from payment apps can create a second copy too. The result is overstated expenses or income and a reconciliation that never balances. See our guide to finding duplicate transactions in QuickBooks Online.
5. Recording net payouts instead of gross sales
Stripe, PayPal, Shopify Payments and marketplaces deposit sales after deducting fees, refunds and reserves. Recording only the deposit as revenue understates sales, hides fees and makes margin analysis impossible.
Fix: record gross sales, fees and refunds separately and run payouts through a clearing account that returns to zero. Our e-commerce bookkeeping service is built around this workflow.
6. Letting “Uncategorized” and suspense accounts grow
Accounts such as Uncategorized Expense, Uncategorized Income, Ask My Accountant or Suspense are meant to be temporary. When they carry large balances, your P&L is incomplete and nobody knows what those amounts are.
Fix: clear these accounts to zero as part of every monthly close, and keep a running list of questions for the business owner.
7. Ignoring the balance sheet
Many owners only look at the profit and loss statement. But the balance sheet is where problems hide: negative bank balances, old undeposited funds, loans that never decrease, accounts receivable from customers who paid long ago. If the balance sheet is wrong, the P&L is wrong too.
Fix: review every balance sheet account each month and tie it to a statement, schedule or report.
8. Leaving receivables and payables out of date
When customer payments are deposited without being applied to the invoice, the invoice stays open and your accounts receivable report overstates what you’re owed. The same happens with bills paid outside the accounting system. Learn how to read and clean your accounts receivable aging report.
9. Not keeping supporting documents
A transaction without a receipt, invoice or statement is hard to defend and hard to correct. Record-keeping requirements vary — the IRS generally asks businesses to keep records that support income and deductions for at least three years (longer in some cases), and the Canada Revenue Agency generally requires records to be kept for six years from the end of the tax year they relate to.
Fix: capture receipts digitally with an app such as Dext or Hubdoc, or attach them directly in QuickBooks Online or Xero. Confirm retention requirements with your CPA or accountant.
10. Waiting until year-end to catch up
Doing twelve months of bookkeeping in March is slower, more expensive and less accurate than doing one month at a time — and you spend the whole year making decisions without current numbers.
Fix: follow a consistent close. Our monthly bookkeeping checklist covers every step.
A quick self-check
| Question | Healthy answer |
|---|---|
| When was each bank account last reconciled? | Within the last 45 days |
| Does the software bank balance match the statement? | Yes, to the cent |
| What is in Uncategorized / Suspense? | Zero, or only this month’s open questions |
| Do clearing accounts (Stripe, PayPal, Shopify) return to zero? | Yes, after each payout |
| Does the A/R aging match what customers actually owe? | Yes |
If you answered “no” or “not sure” to two or more, your books likely need a cleanup before they can support decisions.
Get your books back on track
AccoTiva provides fixed-fee monthly bookkeeping and catch-up and cleanup bookkeeping for small businesses in the United States and Canada. Book a free bookkeeping consultation and we’ll tell you what needs fixing.