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Top Bookkeeping Mistakes That Can Trigger IRS Audits

Published on

August 4, 2025

Bookkeeping done wrong = IRS audit risk.

Many small businesses face penalties, interest, and compliance issues due to avoidable bookkeeping mistakes. From misclassified expenses to missing 1099 forms, these errors snowball into tax problems if left unchecked.

Here are the most common mistakes we see, and how to fix them before the IRS finds them.

Misclassified Expenses or Income

Common Mistakes:

Why It Matters:

Improper classification leads to disallowed deductions, inflated taxable income, and audit red flags.

Invoicing & Sales Tax Tracking Errors

Common Mistakes:

Risk:

Incorrect collection and remittance = sales tax audit + state penalties

Incomplete Customer & Vendor Records

Issues:

Risk:
Lack of 1099 compliance exposes you to IRS fines and delayed filings.

Missed Payroll Accruals

Mistakes:

Result:

Under reported liabilities, incorrect financials, late deposits

Owner Distributions & Fixed Asset Confusion

Errors:

Consequences:

Taxable income is understated, depreciation schedules go missing, and IRS penalties increase.

Why Year-Round Bookkeeping Prevents Risk

Clean Books = Fewer Problems

Regular bookkeeping isn’t optional, it’s your first line of defense against tax issues.

At FinStackk, we provide:

Need help cleaning up your books or preparing for tax season?
Contact FinStackk today.

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