The five QuickBooks errors we see on nearly every small-business cleanup: owner draws booked as expenses, missing 1099 vendors, uncleared Ask-My-Accountant transactions, auto-categorized bank feeds, and a negative A/P balance that nobody notices.
We take on cleanup projects every January — businesses whose books looked fine all year, until the CPA actually opens the file. Here are the most common landmines.
1. Owner draws booked as business expenses
This is the #1 mistake we find. The owner writes themself a $5,000 check. QuickBooks Auto-categorize guesses "Contract Labor" or "Office Supplies." Result: the business overstates expenses by $60K a year, the P&L looks artificially low, and the books disagree with what's actually flowing through to the owner's personal return.
Fix: Owner draws should be posted to Owner's Draw (an equity account). For S-Corp owners, owner compensation is either Officer Compensation (for payroll) or Shareholder Distributions (for non-payroll withdrawals). Never an expense.
2. Vendors paid $600+ with no W-9 on file
Every January, the IRS wants a 1099-NEC for any non-corporate vendor you paid $600+ for services. If you didn't collect a W-9 when you onboarded them, you're scrambling in mid-January to chase them down — or paying the IRS $310 per missed 1099 (up to $3.9M/year).
Fix: Mark 1099-eligible vendors in QuickBooks (Expenses → Vendors → Prepare 1099s → Track payments for 1099s). Collect a W-9 before cutting the first check. We re-send W-9 links to client vendors every November.
3. "Ask My Accountant" transactions that nobody asks about
QuickBooks has a default Ask My Accountant account for transactions you're not sure how to categorize. That's fine — until six months of rent, a $12K wire, and a personal Amazon charge are all sitting there on December 30.
Fix: Make a rule — Ask My Accountant gets cleared every month, not every year. If a transaction is legitimately unknown, attach a note describing what you remember. We can figure out "wire to Ningbo, $12,400, July" far more easily than a blank line item.
4. Blindly trusting bank-feed auto-categorization
Bank feeds save enormous time — but QuickBooks' machine-learned rules are wrong often enough that you need to actually look. Common disasters:
- A single Costco run gets split across "Office Supplies," "Meals," and "Repairs" — when it was actually all inventory
- Venmo transfers categorized as income (when they were reimbursements)
- Credit-card payments booked as expenses (double-counts every charge already on the card)
Fix: Don't click Add on feed transactions without reading the auto-category. Run a Transaction List by Account once a month and scan for anything that doesn't belong.
5. Negative A/P, negative A/R, or a mystery balance
Red flags on every balance sheet review:
- Negative Accounts Payable — usually means a bill was recorded twice, or a payment was posted without a bill
- Negative Accounts Receivable — often a customer payment applied to a zero or already-paid invoice
- "Uncategorized Income" / "Uncategorized Expense" — QuickBooks' catch-all for transactions it truly can't place
- An Opening Balance Equity line that never went away — a setup artifact that should be cleared to Retained Earnings
Most tax-time scrambles are bookkeeping-time problems that nobody noticed in July.
A 15-minute monthly hygiene check
If you do just these each month, you'll avoid 90% of what we clean up in January:
- Reconcile every bank and credit card account
- Review the P&L — does every line item look reasonable relative to last month?
- Clear out Ask My Accountant
- Review the A/R aging and A/P aging reports for negatives
- Scan Uncategorized Income / Expense and re-categorize
Not confident your books are clean? We offer a flat-fee diagnostic — we review six months of transactions and send you a written list of what's right and what needs fixing. Get a diagnostic.