Why it matters
Commingling business and personal money makes deductions hard to substantiate, weakens the LLC liability shield, complicates partner accounting, confuses lenders evaluating the business for credit, and creates a recurring tangle to unravel each tax season. A separate business account avoids all of these problems.
Sole proprietor without LLC
You don't need to be an LLC to open a business bank account. Most banks accept a "doing business as" (DBA) registration, an EIN (or SSN), and a state or local business license to open a sole-proprietor business account. The account name can match your DBA, helping clients write checks correctly.
Best practice flow
All client deposits go into the business checking. All business expenses come out of the business checking (or business credit card auto-paid from business checking). When you need personal money, transfer it from the business account to your personal account as an "owner draw" — recorded as such, not as wages.
Getting started
Most online banks (Mercury, Bluevine, Relay, Novo, Lili) offer free business checking with no minimum balance and good integrations with QuickBooks and other accounting software. Traditional banks (Chase, Wells Fargo, Bank of America) offer business accounts with monthly fees that may waive with average balance or bundled services.
When to add a credit card
A business credit card extends the separation discipline to credit purchases and earns rewards on business spending. Pay it off monthly to avoid interest. Most cards offer downloadable transaction reports that integrate cleanly with accounting software.
When to bring in a professional
DIY tax software handles most small-business returns competently, but a handful of situations reliably justify a CPA or enrolled agent: an entity formation or election, a multi-state filing situation, a significant fixed-asset purchase that triggers Section 179 or bonus depreciation modeling, a retirement-plan setup, an IRS notice or examination, and the year of an entity sale. Outside those situations, software plus an annual half-day of personal review produces a defensible return. The cheapest professional engagement is a one-hour consultation rather than a full-service tax-prep relationship.