Accounting basics
Small Business Accounting 101
Accounting doesn't have to be complicated. This guide covers the four things every small business owner needs to know: the three financial statements, the accounting method choice, what to track weekly vs monthly, and how to avoid the most common bookkeeping mistakes.
The Three Financial Statements You Need
1. Income Statement (P&L)
Shows revenue, expenses, and profit over a period. Answers: “Are we making money?” Use our profit margin calculator and see our how to read a P&L guide.
2. Balance Sheet
Shows assets, liabilities, and equity at a point in time. Answers: “What do we own and owe?” See our balance sheet guide and assets vs liabilities.
3. Cash Flow Statement
Shows cash coming in and going out. Answers: “Do we have enough cash to pay bills?” Use our cash flow forecast and see our cash flow statement guide.
Cash vs Accrual Accounting
Your choice of accounting method affects when revenue and expenses appear on your books:
| Factor | Cash Basis | Accrual Basis |
|---|---|---|
| Record revenue when | Cash hits your bank | Invoice is sent |
| Record expenses when | Money leaves your account | Bill is received |
| Complexity | Simple | More complex |
| Best for | Solo owners, startups under $30M revenue | Growing businesses, inventory-heavy, need loans |
For a deeper comparison, see our full cash vs accrual guide.
What to Track and When
Weekly (30 minutes)
- Categorize new transactions in accounting software
- Send unpaid invoices and pay due bills
- Reconcile bank and credit card transactions
Monthly (1-2 hours)
- Run an income statement — review revenue, expenses, and net income
- Run a balance sheet — check assets vs liabilities
- Review budget vs actuals — use our budget calculator
- Review accounts receivable aging — who owes you money
Quarterly (3-4 hours)
- File quarterly estimated tax payments — use our quarterly tax calculator
- Review profit margins by product or service line
- Update cash flow projections for the next quarter
Common Bookkeeping Mistakes
❌ Mixing personal and business expenses
This is the #1 mistake. Open a separate business bank account and credit card. The IRS scrutinizes businesses that co-mingle funds.
❌ Not tracking mileage and small cash expenses
Mileage deductions add up fast ($0.70/mile in 2026). Small expenses (parking, tolls, supplies) also accumulate — track them consistently.
❌ Forgetting to reconcile bank accounts
If your books don't match your bank statements, you don't have accurate financials. Reconcile monthly at minimum.
Essential Accounting Tools
Every small business needs a few basic tools to keep accounting manageable. Start with accounting software connected to your business bank account. Add a separate business credit card for automatic expense categorization. Use our free calculators to supplement your software:
Frequently asked questions
Do I need an accountant or can I do it myself?+
Many small business owners can handle basic bookkeeping themselves using accounting software, especially in the first year or two. However, you should consult a CPA for: setting up your chart of accounts, choosing cash vs accrual accounting, quarterly estimated tax payments, and annual tax filing. As a rule of thumb, if your business has employees, inventory, or multiple revenue streams, professional help is worth the cost.
What accounting software should I use?+
QuickBooks is the most widely used — it handles invoicing, expense tracking, payroll, and tax reporting. Xero offers similar features with a cleaner interface. FreshBooks is simpler and better suited for freelancers and service businesses. Wave is free and good for micro-businesses with basic needs. All of these integrate with your business bank account for automatic transaction imports.
How often should I update my books?+
Weekly is ideal for most small businesses. Monthly is the minimum — you need to know your revenue, expenses, and profit at least once per month to make informed decisions. Daily updates are recommended if you have high transaction volume (retail, e-commerce, restaurant). The worst approach is waiting until tax season and trying to reconstruct a year of transactions.
What's the difference between bookkeeping and accounting?+
Bookkeeping is the day-to-day recording of transactions — categorizing expenses, reconciling bank accounts, sending invoices. Accounting is the higher-level analysis — interpreting financial statements, tax planning, cash flow forecasting, and business advice. Many small businesses use a bookkeeper (or software) for the first and a CPA for the second.
Can I use cash basis accounting for my small business?+
Yes. The IRS allows cash basis accounting for most small businesses with average annual gross receipts under $30 million (2026 threshold). Cash basis is simpler: you record income when received and expenses when paid. Most small businesses start with cash basis and switch to accrual when they grow, need a loan, or want more accurate financial reporting.