Contracting moves fast—bids, change orders, draws, and vendor payments all hitting the account at once. If your bank reconciliation lags (or worse, never gets done), you’ll chase phantom cash, overpay taxes, and make decisions on unreliable numbers. Here are the 11 most common reconciliation mistakes contractors make—and how to fix each one, step by step.
- Treating the bank balance as “cash on hand”
Mistake: Assuming the online bank balance equals available cash. It rarely does. Outstanding checks, undeposited funds, and pending card batches distort reality.
Fix: Reconcile monthly (weekly during busy season). Build a cash summary that starts with the reconciled balance, then subtract outstanding checks and add deposits in transit to see true spendable cash. - Skipping undeposited funds tracking
Mistake: Recording client payments directly to income and depositing them later, creating timing mismatches and duplicate revenue.
Fix: Use an “Undeposited Funds” clearing account. Post each customer receipt there, then create a single bank deposit that mirrors your actual bank batch. This keeps books in lockstep with the bank statement. - Mixing business and personal transactions
Mistake: Paying for fuel, meals, or subscriptions on the personal card “just this once.” These strays complicate reconciliations and corrupt job costs.
Fix: Keep a dedicated business card and checking account. If a personal card is used accidentally, book it as an owner contribution/reimbursement immediately and attach the receipt. - Ignoring merchant processor timing
Mistake: Recording gross receipts on the invoice date while the processor hits the bank net of fees days later. Recons become a puzzle of missing dollars.
Fix: Record sales gross to Accounts Receivable and use a “Processor Clearing” account. Post fees to merchant fees and transfers from clearing to bank when deposits arrive. Fees become visible and match statements. - Not matching deposits to specific invoices
Mistake: Lumping multiple client payments into one big deposit without tying them to invoices, which leaves open receivables and inflates AR aging.
Fix: Always “apply payment” to the exact invoices before creating the bank deposit. Your AR report will become trustworthy (and collections easier). - Overlooking stale checks and duplicates
Mistake: Old checks sit unreconciled for months, or the same bill gets paid twice because the first check never cleared.
Fix: Investigate any item older than 60 days on the reconciliation report. Void and reissue if necessary, and contact vendors about lost checks. Enable positive pay with your bank to prevent duplicate fraud. - Posting transfers as income or expense
Mistake: Owner draws, credit card payments, or savings transfers land in income/expense categories, skewing profitability and taxes.
Fix: Set up equity and transfer accounts. Book credit card payments as transfers to the card liability; book owner draws/distributions to equity. Profit & Loss stays clean. - Forgetting job-cost allocations during reconciliation
Mistake: Reconciling the bank without allocating costs to jobs, leading to underbilled change orders and inaccurate WIP.
Fix: Build a month-end close checklist: reconcile bank and credit cards, then allocate costs to jobs (labor, materials, subs, equipment). Tie to budgets, update WIP, and lock the period. - Using the wrong posting date
Mistake: Backdating or future-dating entries to “force” a reconciliation. This creates period leakage and makes financials unreliable.
Fix: Record transactions on the actual bank-cleared date when reconciling. If you need accruals for financial accuracy, use adjusting journal entries—not date manipulation. - Failing to capture bank/processor fees and interest
Mistake: Small monthly fees, wire charges, and interest income/expense get ignored, throwing off the reconciliation by a few dollars that compound over time.
Fix: During each reconciliation, comb the statement for fees and interest. Set recurring rules in your accounting system to auto-categorize common charges (e.g., “Bank service charge,” “Wire fee,” “Interest income”). - Reconciling sporadically—or not at all
Mistake: Waiting until tax time to “true up.” By then, you can’t remember what happened on that July deposit or November refund.
Fix: Reconcile on a cadence: weekly during peak season, monthly at minimum. Assign ownership, set a calendar reminder, and maintain a living reconciliation checklist with: - Download statements
- Match deposits (with invoice links)
- Clear checks and ACH payments
- Record fees/interest
- Review outstanding items >60 days
- Save reconciliation reports and bank statements to a secure folder
Quality Controls That Make Reconciliations Stick
- Bank feeds with human review: Bank feeds speed things up, but rules can miscategorize spending (e.g., fuel vs. equipment rental). Always review suggested matches before accepting.
- Dual control: One person prepares the reconciliation; another reviews and signs off. This reduces errors and deters fraud.
- Document retention: Attach PDFs of statements and key receipts to each month’s close. If you’re audited, you won’t scramble.
- Job-cost hygiene: Tag every material, rental, and subcontractor bill to a job or overhead bucket. Your margin reports will finally match what your gut tells you on-site.
When to Get Help
If reconciliations take more than a few hours per account, if your AR/AP aging looks wrong, or if your cash position keeps surprising you, it’s time to bring in bookkeepers for small businesseswho understand construction nuances like progress billing, retainage, and WIP. Clean, timely reconciliations are the foundation for accurate bids, confident payroll runs, and fewer tax-time headaches.
Dial in your reconciliation process now and your numbers will start working for you—clarifying cash, sharpening job profitability, and freeing you to focus on building, not bookkeeping.
