What accounting method should a new small business use?

Most small businesses start with cash-basis accounting, which records income when received and expenses when paid. It is simpler, requires less accounting expertise, and is sufficient for sole proprietors and small S-corps and LLCs. Accrual accounting — which records income when earned and expenses when incurred — is required for businesses with inventory over a threshold (currently $25 million in average annual receipts under IRS rules) and provides a clearer picture of profitability for growing businesses.

Do I need to open a separate business bank account?

Yes, immediately. Commingling personal and business funds is the most common accounting mistake new business owners make. It creates tax preparation problems (which transactions were business?), exposes you to personal liability claims if your business is an LLC or corporation (commingling can pierce the corporate veil), and makes audits substantially harder. Open a dedicated business checking account before your first transaction.

When should I hire a CPA for my business?

At a minimum, hire a CPA for your first business tax return to establish the correct entity structure and deduction baseline. Ongoing bookkeeping can be handled by a bookkeeper or software until your complexity grows. If you have employees, are considering an entity election, have revenue exceeding $250,000/year, or are approaching a bank loan or outside investment, CPA involvement becomes clearly cost-effective.

What is a chart of accounts and do I need to customize it?

A chart of accounts is the categorized list of all accounts your business uses to record transactions — revenue accounts, expense categories, assets, and liabilities. Accounting software creates a default chart, but you should customize it to match your business model. A consulting firm, a retailer, and a restaurant have very different expense categories. Customization improves the usefulness of your financial reports.

How often should I reconcile my books?

Monthly reconciliation — matching your recorded transactions to your bank and credit card statements — is the minimum for a functional accounting system. Monthly reconciliation catches errors, fraud, and missing transactions before they compound. Weekly is better for businesses with high transaction volume. Many business owners who do annual reconciliation at tax time discover months-old errors that are painful to unwind.

How to Set Up Your Business Accounting System From Scratch (2026 Guide)

September 29, 2026 · Guide · 5 min read

The foundation of a business accounting system is simpler than most new business owners expect: a dedicated business bank account, accounting software, a basic chart of accounts, and a consistent weekly habit of recording transactions. Get those four things in place in the first month and you've solved 80% of the accounting problems that plague small businesses at tax time. The remaining 20% — entity structure, payroll, sales tax, depreciation — you add as your business grows or with guidance from a CPA.

Step 1: Open a Dedicated Business Bank Account

This is the single most important first step, and it needs to happen before your first business transaction. Every dollar that touches your business should flow through an account that never mixes with personal finances. Choose a bank with no monthly fee for small business checking (many online banks offer free business accounts), a debit card, and the ability to export transactions in CSV or OFX format for easy import into accounting software.

Get a dedicated business credit card as well. Putting all business expenses on one card creates a secondary transaction record and builds business credit history. Pay it in full each month from the business checking account. The combination of business checking + business credit card gives you clean, separated transaction records from day one.

Step 2: Choose Accounting Software

For most small businesses, one of three software options is appropriate:

QuickBooks Online (Simple Start or Essentials): The most widely used small business accounting software, compatible with virtually all accountants and bookkeepers. Monthly cost: $35–$75 depending on tier. Best for: businesses that want broad accountant compatibility and will eventually outsource bookkeeping.
Wave (free): Fully free for income/expense tracking, invoicing, and basic financial reports. Charges for payroll and payment processing. Best for: solo operators, freelancers, and very small businesses that don't need payroll integration.
FreshBooks: Invoicing-first software popular with service businesses and freelancers. $19–$55/month. Best for: businesses that send many client invoices and want time tracking integration.

For a more detailed comparison of bookkeeping software options and their costs, see our bookkeeping software guide. Connect your software to your business bank account and credit card for automatic transaction import — manual data entry is the source of most small business bookkeeping errors.

Step 3: Set Up Your Chart of Accounts

Your chart of accounts organizes every financial transaction into categories. The default chart your software creates is a starting point, not a finish line. Customize it to reflect your actual business activity. Key account categories:

Revenue Accounts

Break revenue into meaningful segments. A consulting firm might have "consulting fees," "project retainers," and "workshop revenue." A retailer might have revenue by product category. One undifferentiated "sales" account tells you total revenue but nothing about which parts of your business are growing or shrinking.

Operating Expense Accounts

Common small business expense categories: rent/occupancy, utilities, payroll/contractors, software subscriptions, marketing and advertising, professional services (legal, accounting), insurance, travel, meals and entertainment, office supplies, and vehicle/mileage. The IRS has specific rules about deductibility for categories like meals (50% deductible) and home office — setting up separate accounts for these from day one makes tax season significantly easier.

Cost of Goods Sold (COGS)

If your business sells physical products, COGS tracks the direct cost of those products separately from operating expenses. This is important for gross margin visibility and for inventory valuation. Service businesses typically don't have COGS accounts — their labor costs go to operating expenses.

Step 4: Establish a Weekly Accounting Habit

A business accounting system only works if transactions are recorded consistently. Set aside 30–60 minutes per week to:

Review auto-imported transactions from your bank and credit card feeds
Categorize any uncategorized transactions
Enter any cash transactions that don't auto-import
Send and follow up on any outstanding invoices
Check accounts receivable (what's owed to you) and accounts payable (what you owe)

This habit prevents the "shoebox of receipts" situation that creates expensive CPA hours at tax time and makes it impossible to understand your business's financial health in real time.

Step 5: Reconcile Monthly

Monthly reconciliation means matching every transaction in your accounting software to the corresponding entry on your bank and credit card statements. Software-assisted reconciliation takes 15–30 minutes per account once your accounts are set up and transactions are categorized. It catches errors, duplicate entries, and unauthorized charges before they compound into larger problems.

Step 6: Run Basic Financial Reports Monthly

Three reports are the foundation of financial visibility:

Profit and Loss (Income Statement): Revenue minus expenses equals net income. Run this monthly and compare month-over-month. This is the primary tool for tracking business performance.
Balance Sheet: Assets (what you own) minus liabilities (what you owe) equals equity. Relevant once you have meaningful assets or debt.
Cash Flow Statement: Tracks actual cash in and out. A business can be profitable on paper and cash-strapped in practice — this report shows the difference.

Step 7: Separate Owner Compensation Correctly

How you pay yourself depends on your entity structure, with significant tax implications:

Sole proprietor/single-member LLC: Owner draws are not "expenses" — they're simply transfers from business to personal account. You pay self-employment tax on net business income regardless of how much you actually drew.
S-Corp: You must pay yourself a "reasonable salary" through payroll (subject to payroll taxes) and then can take additional distributions. The salary/distribution split has major tax implications — this is where a CPA's guidance pays for itself.
Partnership/multi-member LLC: Partners take guaranteed payments (similar to salary) and/or profit distributions per the operating agreement.

Entity structure decisions have long-term tax and liability implications. For guidance on choosing and understanding the tax differences between entity types, see our CPA vs. accountant vs. bookkeeper guide for who to consult at each stage.

When to Bring in a CPA

A bookkeeper or accounting software handles daily transaction recording. A CPA adds value at specific decision points:

First-year business tax filing — establish the correct foundation
Considering an entity election (S-Corp, C-Corp from a sole prop or LLC)
Hiring your first employee — payroll tax setup, withholding, quarterly filings
Revenue approaching $250,000+ — the S-Corp election consideration becomes financially significant
Approaching a bank loan — the bank will want clean, CPA-reviewed financials
Planning a business sale — tax structure of the deal has major long-term implications

For guidance on finding a CPA who works with businesses at your stage, our guide to finding a CPA for small business covers what to look for and what questions to ask. To find CPAs in your area, browse our directory by city or search for CPAs near you.

Frequently Asked Questions

What accounting method should a new small business use?: Most small businesses start with cash-basis accounting, which records income when received and expenses when paid. It is simpler, requires less accounting expertise, and is sufficient for sole proprietors and small S-corps and LLCs. Accrual accounting — which records income when earned and expenses when incurred — is required for businesses with inventory over a threshold (currently $25 million in average annual receipts under IRS rules) and provides a clearer picture of profitability for growing businesses.
Do I need to open a separate business bank account?: Yes, immediately. Commingling personal and business funds is the most common accounting mistake new business owners make. It creates tax preparation problems (which transactions were business?), exposes you to personal liability claims if your business is an LLC or corporation (commingling can pierce the corporate veil), and makes audits substantially harder. Open a dedicated business checking account before your first transaction.
When should I hire a CPA for my business?: At a minimum, hire a CPA for your first business tax return to establish the correct entity structure and deduction baseline. Ongoing bookkeeping can be handled by a bookkeeper or software until your complexity grows. If you have employees, are considering an entity election, have revenue exceeding $250,000/year, or are approaching a bank loan or outside investment, CPA involvement becomes clearly cost-effective.
What is a chart of accounts and do I need to customize it?: A chart of accounts is the categorized list of all accounts your business uses to record transactions — revenue accounts, expense categories, assets, and liabilities. Accounting software creates a default chart, but you should customize it to match your business model. A consulting firm, a retailer, and a restaurant have very different expense categories. Customization improves the usefulness of your financial reports.
How often should I reconcile my books?: Monthly reconciliation — matching your recorded transactions to your bank and credit card statements — is the minimum for a functional accounting system. Monthly reconciliation catches errors, fraud, and missing transactions before they compound. Weekly is better for businesses with high transaction volume. Many business owners who do annual reconciliation at tax time discover months-old errors that are painful to unwind.