3 Years of Catch-Up Bookkeeping in 11 Days: What We Found Inside a Contractor's Neglected QuickBooks

The QuickBooks invite came through on a Tuesday afternoon in August. The owner runs a residential remodeling and additions business, eleven people on a good week, and he had been meaning to send it for about a year.

Here is what the file showed before we touched anything. Last reconciliation on the operating account: August 2023. Bank feed backlog: 2,184 transactions sitting in For Review. Three tax years, 2023 through 2025, filed off numbers nobody had checked. A business credit card nobody had ever reconciled, and a personal card that did most of the buying.

None of that is a character flaw. By year three, most contractor files look like this, because the one person who could fix it is on a job site. It is a time problem, and it is fixable.

A cleanup starts with an inventory, not a fix. Before anyone categorizes a transaction, we run the balance sheet, the profit and loss, the reconciliation history, and the audit log, and we write down what is actually in the file. This one took most of day one.

The file in this post is a composite. It is one storyline assembled from contractor cleanups we have completed, with figures rounded and details changed so no client is identifiable. The five findings are the ones we see most often in contractor files, and the order we found them in is the order you would too.

Catch-up bookkeeping brings a file from its last clean month to today, and cleanup fixes what was recorded wrong along the way. A three-year-old contractor file always needs both, because nobody falls three years behind while recording everything correctly. The steps do not change: reconcile every account back to the last clean month, fix what the reconciliations expose, rebuild the balance sheet, and hand back a file with a change report the CPA can use.

We will not walk the process step by step here. Our bookkeeping cleanup and catch-up page has the timeline estimator by months behind, and the first-30-days section of our outsourced bookkeeping guide covers the handoff into a monthly close. This post is about what the process turned up.

What we saw. Revenue on the 2025 profit and loss read $1,742,000. Customer deposits into the bank that year came to $1,598,000. The $144,000 difference was invoices that had been paid and never closed.

Why it happens to contractors. Progress billing. The owner invoiced each draw on a job from QuickBooks. When the check cleared and the deposit arrived through the bank feed, he added it as new income, because that is the obvious thing to do when the feed asks what a deposit is. The invoice stayed open, so the file held the same dollars twice.

What it did to the numbers. The file overstated revenue across the 36 months by $328,000: $318,300 through open invoices and $9,700 through deposits entered twice. Accounts receivable read $367,600 when the real figure was under $50,000, and the owner priced his 2026 bids off a 24 percent gross margin that was really 17. The returns caught less of this than you would expect, because the CPA filed on a cash basis, where an unpaid invoice does not exist. The accrual reports the owner read every month carried all of it.

What we did. Matched every deposit to its invoice, month by month, and reversed the duplicate income. One rule going forward: deposits get matched, never added.

What we saw. The operating account was last reconciled in August 2023 by an office manager who left that October. Nobody reconciled 31 of the 36 months since. The other five had been forced to agree in a single weekend in early 2025, with $4,180 of reconciliation discrepancy entries. Nobody had reconciled the credit card once in three years.

Why it happens to contractors. The person who reconciled leaves, the owner inherits a screen he has never used, and the bank balance looks fine. QuickBooks runs a profit and loss on unreconciled months without a word of warning. Busy season arrives, and August 2023 quietly becomes the last clean month.

What it did to the numbers. Cash on the books sat $9,700 above the bank, sixty-one old checks had never cleared, and the double counting in Finding 1 stayed invisible for three years, because reconciling is exactly where a deposit matched to nothing gets noticed.

What we did. Thirty-six checking statements and thirty-six card statements, reconciled in order from September 2023 forward, with the five forced months undone and redone. The mechanics are in our walkthrough of reconciling in QuickBooks Online, including the Four-Cause Difference Test, so we will not repeat them here.

What we saw. The owner's personal Visa did the buying at the big-box store, the lumber yard, and the pump on job sites, and it also paid for groceries, a family trip, and the note on a personal truck. The business checking paid the card in full every month, and he coded every payment to Materials because that is what most of the card was. Over 36 months, $261,000 went to that card: $199,600 of it job costs, $61,400 personal.

Why it happens to contractors. The personal card is in the wallet at 7 a.m. and the business card is in the office. Nobody decides to mix them. It happens on the first job site of the week and never gets undone.

What it did to the numbers. Profit and owner distributions were each understated by $61,400 across three years, which matters on an S corporation because distributions affect basis. The 2024 and 2025 returns also claimed $48,500 of personal spending as business expense, which is not something the CPA can leave alone once he knows.

What we did. Pulled all 36 card statements, split every payment into job costs and a distribution, and closed the personal card out of the business. Going forward, the business pays business cards only, and a personal purchase for a job gets reimbursed against a receipt once a month.

What we saw. $47,900 across 2024 and 2025 sitting in Uncategorized Expense and Ask My Accountant. The CPA's workpapers excluded both accounts from the returns as unsupported, with a note asking for detail. A phone call answered the note, and the return did not change.

Why it happens to contractors. Dump fees, permit fees, tools from odd vendors, and fuel from stations that show up on the feed as a terminal number. Nothing looks like a category, so nothing gets one.

What it did to the numbers. $32,400 of real, deductible business costs never claimed across two years. The rest was $8,100 of personal spending, which joined the Finding 3 total, and $7,400 of duplicates. On the amended returns, Findings 3 and 4 pull in opposite directions: $48,500 of personal spending comes out and $32,400 of real costs goes in. The owner will owe a little on the difference, and he will sign returns that are right, which he could not say before.

What we did. Categorized every line with the owner in two 45-minute calls, attached receipts where they existed, and wrote vendor rules so the feed does it next time.

What we saw. While rebuilding accounts payable from subcontractor invoices, one plumbing sub's account showed a payment that matched no bill. In March 2025 the owner paid the sub's draw by ACH from the emailed invoice. In April, after a software change on the sub's side, their office re-sent the same invoice marked unpaid, and he paid it again by check. $12,650, paid twice and expensed twice.

Why it happens to contractors. Sub draws arrive by email, by text, and on paper, and the one in front of you is the one that gets paid. Without a payables list, a duplicate looks like any other expense.

What it did to the numbers. Subcontractor expense for 2025 overstated by $12,650, and cash that had left the business and never come back.

What we did. Sent the sub both payment records. They confirmed within a day and applied a $12,650 credit against a current job's draw at the end of August. One line, found on day six, and the number the owner quotes when he tells the story.

Six lines from the balance sheet as of July 31, 2026, as the file showed them on day one and as they stood on day eleven. This is the artifact the whole engagement produces.

What the CPA could not have known from the "as found" column is which number was wrong: the $367,600 the customers supposedly owed, or the revenue that figure implied. A CPA works from the file. If the file says customers owe you $367,600, the questions start there, and they take a phone call to answer. Three years of returns rested on that phone call. Nothing in the "as found" column was a lie, and nothing in it was true.

Eleven business days from the invite to the handoff. Here is where they went.

Our working rule is 3 to 15 business days. Three covers a file under six months behind with one bank account and no payroll. Fifteen covers two to three years behind with several accounts and payroll. This file sat at eleven: three years, two active accounts, a payroll app, and no inventory to count. The estimator on our cleanup and catch-up page gives the range by months behind, and the table above is what those days actually contain.

Five yes or no questions. Count the yeses.

1. 1Is the last reconciliation on your main bank account older than three months?
2. 2Has a personal card been used for business purchases in the past year?
3. 3Does the owner get paid through anything coded as an expense, including card statements paid by the business?
4. 4Are there more than 50 transactions sitting in For Review, Uncategorized Expense, or Ask My Accountant?
5. 5Did your CPA ask for adjustments or missing detail on last year's return?

• 0 to 1. Current enough to keep. Reconcile monthly and re-run this list at year end.
• 2 to 3. A cleanup is ahead, and it is a small one if you do it now: days, not weeks, and your next return goes out on checked numbers.
• 4 to 5. This is the file in this post. Stop adding to it, get a diagnostic, and tell your CPA before the next return goes out. Every month you wait adds a month of statements.

Nothing in this file was unusual, and nothing in it was beyond repair. Income counted twice, months never reconciled, a personal card doing business work, a pile of uncategorized costs, and a sub paid twice: any one of them is a Tuesday in cleanup work. Together, they meant the owner ran three years of decisions and three tax returns on numbers nobody had checked.

What he has now: a file his CPA can work from, with a change report by year and notes for two amended returns. A $12,650 credit he did not know he was owed. Bids priced on a 17 percent margin instead of a 24 percent one that never existed. And a monthly close on a fixed date, so August 2026 is the last month anyone has to catch up. If your file looks like the inventory at the top of this post, that is the work we do, inside the QuickBooks file you already have.