Small Business Finances 101: Bank Accounts, Bookkeeping & Taxes

Getting your small business finances in order is one of the most important things you can do in your first ninety days as a US business owner. It is also one of the most intimidating, especially if you have never kept books, filed quarterly taxes, or read a cash flow statement. The good news is that the foundations are simpler than they look. Once you separate your money, choose a bookkeeping method, and build a habit of setting cash aside for taxes, everything else becomes far easier to manage. This guide walks you through the money basics every new business needs, in the order you should tackle them.

A quick note before we start: this article is general information, not financial, accounting, or tax advice. Every business is different, and tax rules change. Consult a licensed CPA or tax professional about your specific situation.

Step one: separate your business and personal money

The single most valuable habit in small business finances is keeping business money completely separate from personal money. Mixing the two (called "commingling") makes bookkeeping a nightmare, weakens the liability protection of an LLC or corporation, and raises red flags if you are ever audited.

Open a business bank account

As soon as your business is registered, open a dedicated business checking account. Most banks will ask for your formation documents and your EIN, so if you have not already done so, get your EIN from the IRS first (it is free). Run every dollar of business income into this account and pay every business expense out of it.

Get a business credit card

A business credit card does three useful things: it keeps expenses cleanly categorized, it builds a credit history in the business's name, and it often earns cash back or points on spending you would do anyway. Pay it off in full each month so interest never eats into your margins. Treat it as a tracking and convenience tool, not a source of financing.

Bookkeeping: the habit that holds everything together

Bookkeeping is simply the ongoing record of money coming in and going out. Done consistently, it takes minutes a week. Done never, it becomes a painful scramble every tax season.

Cash vs. accrual accounting

You will choose one of two methods:

• Cash basis: You record income when you actually receive it and expenses when you actually pay them. It is simpler and the most common choice for new, small service businesses.
• Accrual basis: You record income when it is earned and expenses when they are incurred, regardless of when cash changes hands. It gives a more accurate picture for businesses carrying inventory or invoicing on terms.

Many small businesses start on cash basis. Ask your accountant which method fits your business and whether the IRS requires accrual for your situation.

Pick software and stick with it

You do not need enterprise tools to start. Options range from a well-structured spreadsheet to dedicated apps like QuickBooks, Wave, or Xero. The best choice is the one you will actually use every week. Whatever you pick, connect your business bank account and card so transactions import automatically, then review and categorize them on a set schedule.

Understand your chart of accounts

A chart of accounts is just the list of categories your money falls into. You do not need dozens; a lean starter set covers most new businesses:

• Income: revenue from sales or services.
• Cost of goods sold: direct costs of delivering your product or service.
• Operating expenses: software, rent, marketing, supplies, professional fees.
• Owner's draws or payroll: money you take out of the business.

Tip: Reconcile your books once a month, not once a year. Set a recurring 30-minute calendar block to match your records against your bank statement. Small errors caught early are trivial to fix; a year of them is not.

Tracking income and expenses

Consistent tracking is what turns raw transactions into decisions. Save every receipt (a photo in a dedicated folder or app is fine), note the business purpose, and categorize as you go. Good records mean you claim every deduction you are entitled to and can answer any question about your numbers in seconds. They also feed directly into the tax estimates and cash flow projections we cover below.

Setting aside money for taxes

This is where many first-time owners get caught off guard. Unlike a paycheck, business income arrives without taxes withheld, so it is on you to set money aside. Building this reserve into your small business finances from day one prevents a nasty surprise every April.

What you may owe

• Income tax: federal and, in most states, state income tax on your business profit.
• Self-employment tax: if you are a sole proprietor, partner, or LLC member, you generally owe roughly 15.3% for Social Security and Medicare on top of income tax. Note that your business structure affects your taxes, so how and what you pay can change with your entity choice.
• Sales tax: if you sell taxable goods or certain services, you may need to register with your state, collect sales tax from customers, and remit it. This is not your money; you are holding it for the state.

Quarterly estimated taxes

The IRS operates on a pay-as-you-go system. If you expect to owe $1,000 or more for the year, you generally must make estimated tax payments four times a year (typically mid-April, mid-June, mid-September, and mid-January). Miss them and you can face underpayment penalties even if you pay in full at year-end.

A simple safeguard: every time income lands, move a set percentage into a separate savings account reserved for taxes. Many new owners set aside 25% to 30% as a starting point, then adjust with their accountant. When a quarterly payment is due, the money is already waiting.

Pricing for profit

Solid finances do not start with bookkeeping; they start with prices that actually make money. Before you set a price, know what it costs you to deliver one unit of your product or service, including your own time. Then layer in operating expenses, taxes, and the profit margin you need to grow. Pricing purely by "what competitors charge" is a common trap; their costs and goals are not yours. Revisit pricing at least once a year as your costs change.

Runway and cash flow: the numbers that keep you open

Profit on paper does not pay the bills; cash in the bank does. Two ideas matter here:

• Cash flow: the timing of money in and out. A profitable business can still fail if customers pay slowly while bills come due fast.
• Runway: how many months your business can operate before it runs out of cash, based on your current balance and monthly burn rate.

Knowing your runway tells you how much time you have to reach profitability and when you need to adjust spending, raise prices, or seek funding. A simple monthly projection of expected income, costs, and ending cash balance is enough to see trouble coming while you still have room to react. Scafflow includes a simple financial model that projects your revenue, costs, and runway, so you can see these numbers without building a spreadsheet from scratch.

Putting it all together

You do not have to solve every one of these at once. Separate your money first, then set up bookkeeping, then build the tax-savings habit, and layer in pricing and cash flow planning as you grow. If you want the full sequence of setup tasks in order, our complete startup checklist lays out each step so nothing slips through the cracks. And when the numbers get complex, a CPA is worth every dollar.

Ready to build your financial foundation?

Scafflow gives first-time US business owners a guided, personalized checklist for legal, finance, brand, and growth, plus a built-in financial model to project revenue, costs, and runway. It is free to start. Set up your finances with Scafflow.