Why your business needs its own bank account
'It's all my money anyway' is the sentence that pierces an LLC. This lesson explains why a dedicated business account is the cheapest legal and tax protection a small company can buy — what commingling actually costs, how to set the separation up in an afternoon, and how to handle the gray areas (owner draws, personal purchases for the business, loans to yourself).
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What commingling actually costs you
| Problem | What it looks like | What it costs |
|---|---|---|
| Liability | LLC debts paid from your personal card; business bills from the joint checking | In a dispute, a court can treat the LLC as your alter ego — piercing the liability shield you formed it for |
| Deductions | $8,200 of 'business' expenses half-personal, no clean records | Disallowed deductions, penalties, and an audit with a reconstruction problem |
| Clarity | One account, everything mixed | You cannot read your P&L, cash flow, or real margins — the business is a feeling, not a number |
Courts that pierce an LLC look for exactly this: no separation of finances, the company used as a personal wallet. A $0 monthly-fee checking account is the single cheapest fix.
The afternoon setup
- Open a business checking account (your LLC documents + EIN are all most banks ask for).
- One business credit card for every business expense — it becomes a monthly expense report you didn't have to write.
- Move business income to land there directly — client payment apps pointed at the business account, not your personal one.
- Write the one-page rule: business income → business account → business card for expenses → monthly owner transfer as the only personal touchpoint.
The gray areas, handled
- Paying yourself: a scheduled owner's transfer (or payroll if you're on salary) — same day, same amount where possible. Random ATM grabs are what blur the line.
- You bought something for the business personally: reimburse yourself from the business account with the receipt attached, the same month. Documented reimbursements are clean; vibes are not.
- Loan to/from the business: if real, write it down — amount, date, repayment terms, both signatures. A promissory note you wrote in ten minutes protects you for years.
Separation isn't paperwork theater — it's the difference between 'the business owes this' and 'I owe this.'
The JK23 Ledger Letter, issue 6
Frequently asked questions
Is one account really enough, or do I need savings too?
Start with checking + the business credit card. A business savings account earns its place when you build a cash reserve (see our reserve lesson) — it keeps the buffer visible and one deliberate transfer away.
What if my bank charges business account fees?
Plenty of banks offer free business checking with simple conditions (a few transactions, e-transfers). The fee question matters far less than the separation — even a $15/mo account is cheaper than one disallowed deduction.
I've been commingling for two years. Is my LLC worthless now?
Not necessarily — separation can start the day you start. Clean up going forward, and if anything significant is brewing (a dispute, a loan application, an audit), tell your attorney exactly how the books look today; the honest answer is cheap, the surprise is not.