5 Bookkeeping Mistakes Small Business Owners Make (And How to Fix Them)

Running a small business means wearing many hats. But when bookkeeping falls to the bottom of the priority list, the consequences can show up as penalties, missed deductions, and a nasty surprise in April. Here are the five most common mistakes we see — and exactly how to fix them.

1. Mixing Personal and Business Finances

Opening a dedicated business checking account is the single most impactful step a new business owner can take. When personal and business transactions are intermingled, every tax season becomes an archaeology project. Open a separate account from day one.

2. Skipping Monthly Reconciliation

Reconciling your bank statements monthly catches errors, duplicate charges, and fraud before they compound. Most accounting software can reconcile in under 10 minutes once you're in the habit.

3. Miscategorizing Expenses

Putting a meal with a client under "Meals & Entertainment" versus "Travel" might seem trivial, but consistent miscategorization skews your P&L and can misrepresent deductible amounts. When in doubt, ask your bookkeeper to build out a chart of accounts tailored to your business type.

4. Not Tracking Mileage

The IRS standard mileage rate is 67 cents per mile for 2024. A solo contractor driving 10,000 business miles a year can deduct $6,700 — but only with a contemporaneous log. Apps like MileIQ or even a simple spreadsheet make this effortless.

5. Waiting Until Tax Season to Catch Up

Batch-entering twelve months of transactions in March is how small errors become large problems. A monthly cadence keeps your books accurate, your cash flow visible, and your CPA happy.

Need help getting your books in order? Reach out to our team — we offer catch-up bookkeeping for businesses at any stage.