How to Do Accounting for a Small Business?

Small business accounting is not complicated, it is relentless. The difficulty is never any single task; it is that the tasks recur every week and every month whether or not you have time, and the cost of skipping them compounds quietly until filing season.

What follows is the actual process, in the order it happens.

Step 1: Separate the money

A dedicated business bank account and a dedicated business card, before anything else. Commingled personal and business spending is the root cause of most cleanup work, and it turns every categorization decision into an interrogation of your own memory six months later.

Separate accounts produce cleaner records and a clear financial boundary between you and the business, which matters for lenders, for buyers, and for anyone who ever has to reconstruct what happened. If you have been running mixed for a year, separate now and treat the history as a one-time cleanup project rather than a reason to delay.

Step 2: Choose cash or accrual, and understand what governs the choice

Cash basis records income when money arrives and expenses when money leaves. Accrual basis records income when earned and expenses when incurred.

Cash is simpler and many small service businesses use it. Accrual is more informative whenever you invoice in one month and get paid in another, because cash basis makes a good month look bad and a bad month look fine purely on payment timing.

Which methods you are permitted to use for tax purposes is not a single test. The gross receipts test under IRC section 448(c) is one factor, and for 2026 that threshold is average annual gross receipts of $32 million over the prior three years. But entity type, tax-shelter status, inventory, and long-term contracts also govern, and some businesses may use the cash method even above the threshold, including S corporations, partnerships without C corporation partners, farming businesses, and certain personal service corporations.

Practically: most small service businesses have a genuine choice, and it should be made on what you need the numbers to tell you, then confirmed for your specific facts.

Step 3: Build the chart of accounts around your business

The default chart of accounts in any software is generic. Spend an hour making it specific: expense categories that match how you actually spend, split finely enough to be informative and coarsely enough to stay usable. A contractor needs materials separated from subcontractor labor. A trucking operation needs fuel separated from maintenance.

Getting this wrong is the difference between statements that answer questions and statements that merely tie.

Step 4: The weekly rhythm

• Categorize the bank and card feed. Doing this weekly keeps each session short; letting it accumulate turns it into a project and forces you to reconstruct intent from memory
• Send invoices the day work completes, not at month end
• Capture receipts for anything you would need to defend, photographed at the point of purchase
• Review what is overdue and chase it

Step 5: The monthly close

This is the step most owners skip, and it is the one that makes the rest worth doing. Close means a date after which the period stops moving.

• Reconcile every bank account, every credit card, every loan. If a reconciliation does not clear, find out why before moving on
• Review the P&L against the prior month and investigate anything that moved more than you can explain
• Review the balance sheet, particularly for negative balances and for old items in AR and AP that should have cleared
• Record recurring adjustments: depreciation, prepaid amortization, accruals
• Confirm payroll liabilities match what was actually remitted

A business that closes monthly can answer questions about its finances from a report. A business that does not is guessing until the return is filed.

Step 6: The calendar items

• Quarterly estimated taxes, if applicable to you
• Sales tax filings, on your state schedule
• Payroll tax deposits and quarterly returns
• 1099s in January. Note that for payments made on or after January 1, 2026, the 1099-NEC and 1099-MISC reporting threshold rose from $600 to $2,000, and it is indexed for inflation after that. Collecting W-9s during the year is what makes January painless
• Annual return, built from books that are already closed

When doing it yourself stops paying

There is no revenue number that answers this. The honest question is not whether you can but whether you have, for the last three months.

Four signals that the math has changed: payroll has arrived, you are months behind, you cannot say what you made last month without opening the bank app, or you are making pricing decisions on instinct because the numbers are not current. Any one of them means the cost of not knowing now exceeds the cost of help.

If you are already behind, that is a cleanup engagement first and a monthly process afterwards, in that order. See the related guide and the related guide.