6. Ignoring A/R and A/P backlogs in catch-up bookkeeping
Catch-up bookkeeping often focuses on the cash that has already moved through the bank. However, if you have outstanding invoices (Accounts Receivable) or unpaid bills (Accounts Payable), your books aren't truly caught up. If you are researching catch-up bookkeeping mistakes, this is one of the most common gaps because earned revenue and unpaid obligations can sit outside the bank feed.
The Fix: Review your "Open Invoices" report. If an invoice from last year is still sitting there, ask yourself: Was it paid? Was it a duplicate? Or do I need to send a reminder to the client? Cleaning up your A/R ensures your "Total Income" figure is accurate, not just your "Cash on Hand."
7. Miscalculating payroll and sales tax liabilities in catch-up bookkeeping
This is one of the most serious catch-up bookkeeping mistakes. If you simply record "Payroll Expense" as the amount that leaves your bank account, you are missing the employer-side taxes and the withholdings that you owe to the government.
The Fix: Pull your payroll reports from Gusto, ADP, or your preferred provider. You need to record the gross wages and the specific tax liabilities separately. For sales tax, ensure you aren't counting the tax collected as your own revenue. It is a liability you hold for the state until you pay it.
Practical Example: A catch-up bookkeeping mistakes fix
Imagine you are cleaning up June 2025. Your bank statement shows a $500 payment to a vendor. Your bookkeeping software shows two $500 payments to the same vendor.
- The Error: You manually entered the bill, and then the bank feed pulled in the payment as a separate transaction.
- The Impact: Your expenses are overstated by $500, making your profit look lower than it actually is.
- The Fix: Match the bank feed transaction to the existing bill rather than creating a new expense. This "matching" process is the core of accurate catch-up work.
Want help fixing catch-up bookkeeping mistakes?
If looking at your bank statements makes you feel overwhelmed, we can help. We specialize in taking messy, backlogged books and turning them into clean, tax-ready financials. If you want to understand the basic workflow first, review the IRS recordkeeping guidance for businesses and the QuickBooks guide to account reconciliation.
You can also request a bookkeeping review or learn more about our bookkeeping cleanup service.
Next action: Today, pull your open invoices report, unpaid bills report, bank reconciliations, and payroll liability reports so you can spot catch-up bookkeeping mistakes before month-end.
About the Author
Books LA is a specialized bookkeeping firm based in Los Angeles, California. We are certified QuickBooks Online and Xero ProAdvisors who help growth-stage startups and small businesses maintain clean, paperless financial systems. Tools we work in every day include QuickBooks Online and Xero, with practical workflows for A/P, A/R, payroll support, reconciliations, and document management. Our goal is to provide entrepreneurs with the clarity they need to scale without the stress of "messy books."
IRS/Tax Disclaimer
Books LA does not provide income tax advice. We work closely with CPAs and Tax Strategists to ensure your books are ready for filing. We recommend you confirm all income tax matters with your CPA.
FAQ: Catch-Up Bookkeeping Mistakes
How long does a bookkeeping cleanup usually take?
It depends on the volume of transactions and how many accounts need reconciling. A typical full-year cleanup for a small business usually takes 2 to 4 weeks. If the file has major catch-up bookkeeping mistakes, duplicate entries, or unresolved reconciliations, it can take longer.
What documents do you need from me to start?
We generally need view-only access to your bank and credit card portals, or PDF copies of your statements, along with access to your accounting software (QBO/Xero), open invoices, unpaid bills, and payroll reports. Those records help us identify catch-up bookkeeping mistakes quickly.
Can I just wait until tax season to catch up?
You can, but it is risky. Last-minute cleanups are more prone to catch-up bookkeeping mistakes, and many bookkeepers are fully booked during the first quarter. We do not provide income tax advice, so confirm tax filing decisions with your CPA.
What if I lost some of my receipts?
We can often reconstruct your records using bank statements and vendor history. However, for future compliance, we recommend starting a digital receipt capture system immediately and following the IRS supporting documents guidance.
Do I need to buy new software for a cleanup?
Most cleanups are done within your existing QuickBooks Online or Xero file. If you are not using cloud software yet, we can help you migrate from spreadsheets to a professional system, but new software is not always required to fix catch-up bookkeeping mistakes.
How much does catch-up bookkeeping cost?
Cleanup is typically billed as a one-time project fee based on the number of months behind and the complexity of the accounts. We provide a custom quote after a brief review of your current books, especially if the file has layered catch-up bookkeeping mistakes across payroll, A/R, A/P, and reconciliations.
Will you talk to my CPA?
Yes. We often coordinate directly with our clients' CPAs to ensure the cleanup meets their specific requirements for tax filing. We do not provide income tax advice, and we recommend confirming final income tax treatment with your CPA.
Can I do this myself using AI?
AI can help categorize simple transactions, but it cannot perform a full bank reconciliation or catch complex errors like duplicate entries or misclassified equity. A human professional review is still necessary to find catch-up bookkeeping mistakes accurately.
Are payroll tax and sales tax part of catch-up bookkeeping?
Yes, often. We focus on bookkeeping-adjacent compliance items like payroll tax liabilities, sales tax tracking, and related balance sheet cleanup. For income tax matters, we work with CPAs and recommend you confirm details with your CPA.
