Closing Q3 Books: The Reconciliation Checklist Before You Start Q4
September 30 may close the quarter on the calendar, but it doesn't close the books by itself. Before Q4 gets busy, the third quarter should be reconciled, categorized, and clean enough that you can trust the numbers for a tax projection, lender request, or operating decision.
Reconcile Every Account, Not Just the Checking Account
A full reconciliation means matching the ending balance on every bank statement, credit card statement, and loan statement against what the books show — not just glancing at the primary operating account. Savings accounts, secondary cards, and any merchant processor holding balance (PayPal, Stripe, Square) should all tie out to a statement, with any unexplained difference investigated rather than plugged.
Clear Out the Undeposited Funds and Uncategorized Transactions
Two accounts tend to accumulate clutter throughout a busy quarter: an "Undeposited Funds" holding account that should sit at zero once deposits are matched to the bank, and an "Uncategorized Expense" or "Ask My Accountant" bucket where transactions get parked when nobody was sure where they belonged in the moment. Clearing both before Q4 starts means the P&L for Q3 actually reflects what happened, rather than being a placeholder waiting for cleanup.
Confirm Payroll and Contractor Payments Tie to the Books
If payroll runs through a separate processor, confirm the quarterly totals in the accounting system match what the processor actually reported and remitted — wages, employer payroll taxes, and any benefits. For 1099 contractors, this is also a good checkpoint to confirm payments recorded in the books match what's been tracked for year-end 1099 reporting, since a mismatch discovered in January is much harder to trace back to its source.
Review Accounts Receivable and Accounts Payable Aging
An aging report that hasn't been reviewed since summer can hide problems: invoices that were actually paid but never marked as such, invoices that are genuinely overdue and need follow-up, or vendor bills that were paid outside the normal process and never recorded. A quarterly aging review catches these before they compound into a bigger reconciliation problem at year-end.
Reconcile Sales Tax Collected Against What Was Remitted
For businesses that collect sales tax, Q3 is a good checkpoint to confirm the sales tax liability account matches what's actually been remitted to the state, rather than assuming the two have stayed in sync automatically. A liability account that's grown unexpectedly usually means a filing was missed or a payment wasn't recorded correctly.
Why This Matters Going Into Q4
Q4 tends to be the busiest stretch of the year for many small businesses — holiday sales, year-end planning conversations, 1099 and payroll prep all converging at once. Starting that stretch with three clean, reconciled quarters behind you means the numbers you're working from for year-end tax planning are actually reliable, rather than needing to be untangled at the same time decisions are being made.
This information is educational and describes general bookkeeping practices rather than a substitute for a review of your specific books. If your reconciliations have fallen behind, our bookkeeping team can help you get caught up before Q4 planning conversations start.
Related service: Bookkeeping & Cleanup Services
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