20 Books and Payroll Pitfalls That Will Trigger an Audit (And How to Fix Them)

An audit can start for many reasons, and clean books do not prevent one. They make it much easier to get through one.

What an auditor wants to see

An auditor asks a simple question. Can you prove what your numbers say? They look for records that match the bank, costs in the right places, proof of purchases, and payroll that was paid and reported on time.

When your books are clean, the answers are easy to find. When they are not, every question takes longer and costs more. That is why these 20 pitfalls matter. Fourteen come from the books. Six come from payroll.

The bookkeeping pitfalls

### Mixing personal and business money The problem: When one account holds both, no one can tell which costs belong to the business. The records blur, and tax season turns into a hunt.

The fix: Open a separate business account and card. Pay yourself by moving money out as an owner draw, and record it that way. If the money is already mixed, we sort each line and move the personal ones out of your costs.

### Falling behind on data entry The problem: The longer you wait to record things, the more you forget. Costs go missing. Sales go unrecorded.

The fix: Record on a schedule. Even a short weekly habit helps. Or let us do it every month, so your books are closed by the 10th.

### Skipping monthly bank reconciliations The problem: If you never match your books to your bank and card statements, errors and even fraud can sit unnoticed for months.

The fix: Match every line to the statement every month, until the difference is zero. This is the single best habit in bookkeeping. We do it for every account, every month.

### Misclassifying expenses The problem: A cost in the wrong category makes your reports wrong. It can also change the numbers your tax preparer starts with.

The fix: Use a clear list of categories and put each cost in the one that fits. Review any uncategorized items each month. Nothing should sit there.

### Forgetting receipts and documentation The problem: If you cannot show proof of a purchase, an auditor can disallow the cost.

The fix: Take a photo of each receipt when you buy. Attach it to the transaction in your software. When we cannot identify something, we collect it into one list and send it to you on day 8.

### Confusing cash flow with profit The problem: The money in your bank is not your profit. It leaves out bills you owe, and money customers owe you.

The fix: Read your profit and loss and your balance sheet, not just the bank balance. Together they show what you earned and what you owe.

### Neglecting small transactions The problem: Small purchases feel too little to record. Over a year, they add up to a big gap.

The fix: Record every one. Bank feeds and rules make this quick. A clean month has no unmatched lines, small or large.

### Failing to track money owed to you and money you owe The problem: Unpaid invoices and overdue bills hide inside the bank balance. You think you have more cash than you do, or you pay late and lose goodwill.

The fix: Enter every invoice and every bill. Keep a list of who owes what and when. Check it each month.

### Ignoring inventory tracking The problem: If you guess at stock, you run out of what sells and overbuy what does not. Your cost of goods sold ends up wrong too.

The fix: Count stock on a set schedule and match the count to your books. Record what you used or sold, not just what you bought.

### Using the wrong accounting method, or switching around The problem: Cash basis counts money when it moves. Accrual counts it when you earn it or owe it. Switching back and forth makes your statements impossible to compare.

The fix: Pick one method with your CPA and stick to it. Change only when your CPA says to.

### Failing to record depreciation The problem: Long lasting items such as trucks and equipment lose value over time. If you never record that, your books overstate what you own.

The fix: Ask your CPA for the yearly entry. We book it on schedule so your balance sheet stays right.

### Relying too much on automated bank rules The problem: Rules in your software sort transactions for you. When a rule is wrong, it repeats the same mistake every time.

The fix: Review your rules each month. Look at a sample of what they sorted. Fix a bad rule once, and fix the past entries too.

### Never reading your financial statements The problem: If you never open the reports, you will not see a slide in cash until it hurts.

The fix: Read your profit and loss, balance sheet and cash summary each month. We send them in plain English, with a few lines about what changed.

### Waiting too long to get help The problem: A cleanup gets harder with every month that passes. Late help costs more than early help.

The fix: Start the cleanup now. We catch up the past months first, one account at a time, then keep you current.

The payroll pitfalls

Payroll mistakes cost more than most owners expect. The rules are strict, and the deadlines do not move. This part is general information. Rules change, and they differ by state, so check the details with your tax preparer or the agency.

### Treating employees as contractors The problem: Calling regular staff independent contractors can save on paper. When the work really is that of an employee, it can lead to back taxes, fines and legal trouble.

The fix: The rules depend on how the work is done, not only on what you call it. Ask your CPA or your state agency before you decide. Keep a written record of why you chose the way you did.

### Calculating overtime or wages incorrectly The problem: Math done by hand can be wrong. Some states have their own rules on overtime and breaks, on top of the federal Fair Labor Standards Act.

The fix: Use a payroll system that does the math for you, and keep time records that match. Review a payroll run before it goes out.

### Missing payroll tax deposit deadlines The problem: Employment taxes must be paid in on a set schedule. Late deposits can bring penalties from 2 percent up to 15 percent of the amount, plus interest, and the penalty grows the longer it is late.

The fix: Put every deposit date on a calendar. Each month, match the deposits to your payroll reports. We keep the payroll tax accounts in your books matched, so a missed deposit shows up right away.

### Using out of date withholding or tax rates The problem: Rates change. If you forget to update them at the start of the year, you take out too little or too much from every paycheck.

The fix: Update your payroll rates each January and whenever a rate changes. Check one paycheck against the new numbers before the first run.

### Filing Form 1099 NEC or W2 late The problem: Contractors and employees must get their year end forms on time. Late or missing forms can lead to fines.

The fix: Collect a form from every contractor before you pay them the first time. Track what you pay each person all year. At year end, give your CPA a clean list.

### Ignoring personal liability The problem: When tax is taken out of pay but not sent in, the people who run the company can be held personally responsible. A business loan or a closed company does not always end it.

The fix: Treat withheld tax as money that is not yours. Send it in first, before other bills. If cash is tight, talk to your tax preparer right away, not after a notice arrives.

A situation we clean up

The payroll tax balance that kept growing

A business owner opens the books and sees a payroll tax balance that grows every quarter. No one knows why. The payroll reports say the tax was taken out. The bank does not show it going in.

Here is how we handle it. We pull the payroll reports and the bank statements for each period. We match every deposit to a payment. The ones with no match are the ones that never went out. We list them for the owner right away, so the owner and the tax preparer can fix them together. From then on, we check this balance every month.

Common questions

Does a mistake in my books mean I will be audited? No, not by itself. Audits start for many reasons. Messy books do make an audit harder, longer and more stressful. Clean books make it easier to answer each question.

How long should I keep my records? Ask your tax preparer. The rules differ by type of record, and some must be kept longer than others. Keep digital copies so they are easy to find.

Can you fix books that are already a mess? Yes. We pull the statements for the open months, match each account, and close the months one at a time, from the oldest forward. Then we keep you current.

Do you prepare taxes? We do not prepare income tax returns. We keep your books and payroll records clean, and we answer your CPA's questions about them. For tax advice, talk to your tax preparer.