Bookkeeping Basics for Small Business: A Simple System That Keeps You Tax-Ready

Bookkeeping is the part of running a business most owners postpone, until tax season or a loan application forces them to reconstruct a year of transactions from bank statements. A simple system, done monthly, takes an hour or two and saves days of stress, missed deductions and penalties. This guide sets out that system.

Step 1: Separate business and personal money

Open a business checking account and, if useful, a business credit card. Run every business transaction through them and nothing personal. This single habit makes bookkeeping far easier, supports your deductions, and, for an LLC or corporation, helps protect your limited liability.

Step 2: Choose your accounting software

Cloud accounting software connects to your bank and card accounts, imports transactions and produces reports. Popular options include QuickBooks Online, Xero, Wave and others, with monthly plans for small businesses. Choose one that:

• Connects to your bank and payment processors
• Handles invoicing if you send invoices
• Supports sales tax tracking if you collect it
• Your accountant is comfortable with

A spreadsheet can work for a very small business with few transactions, but software saves time as you grow.

Step 3: Set up a simple chart of accounts

Your chart of accounts is the list of categories you use. Keep it simple and aligned with your tax return.

Income

• Sales or service revenue
• Other income

Cost of goods sold (if you sell products)

• Materials and inventory
• Shipping and packaging for products

Expenses

• Advertising and marketing
• Bank and processing fees
• Contract labour
• Insurance
• Software and subscriptions
• Office supplies
• Professional fees (legal, accounting)
• Rent
• Repairs and maintenance
• Travel
• Meals (business portion, subject to IRS limits)
• Utilities and phone
• Vehicle expenses
• Wages and payroll taxes

Step 4: Capture receipts and documents

Use your software's receipt capture or a dedicated app to photograph receipts as soon as you get them. For each expense, keep:

• Date, vendor and amount
• What it was for and the business purpose
• Who attended, for meals

Keep invoices you issue, bank statements, card statements, payroll records, contracts, and mileage logs if you use a vehicle for business.

Step 5: Categorise transactions weekly

Spend 15 minutes a week categorising imported transactions. Set up rules for recurring items, such as your phone bill or software subscriptions, so they categorise automatically. Weekly reviews catch errors and fraud early.

Step 6: Reconcile every month

Reconciliation means matching your books to your bank and card statements so the balances agree. Do it every month:

1. Open the reconciliation tool in your software.
2. Enter the statement ending balance and date.
3. Tick off each transaction that appears on the statement.
4. Investigate differences: missing transactions, duplicates or wrong amounts.
5. Finish when the difference is zero.

A business that reconciles monthly can trust its numbers.

Step 7: Read your reports

Three reports tell you how the business is doing:

• Profit and loss (income statement): revenue, costs and profit for a period. Review monthly.
• Balance sheet: what the business owns and owes at a point in time.
• Cash flow: how cash moved in and out. Profit and cash are not the same; a profitable business can still run out of cash if customers pay late.

Ask three questions every month: Did we make a profit? Is cash enough for the next three months? Which costs grew faster than revenue?

Step 8: Plan for taxes all year

Set aside money

Most sole proprietors and single-member LLC owners pay income tax plus self-employment tax (about 15.3 percent of net earnings for Social Security and Medicare, with an income cap on the Social Security part). Many owners move a fixed share of every payment, often 25 to 30 percent, into a separate tax savings account. A tax professional can help set the right percentage.

Pay quarterly estimated taxes

If you expect to owe a significant amount when you file, the IRS generally expects quarterly estimated payments using Form 1040-ES. Typical due dates are mid-April, mid-June, mid-September and mid-January. Missing them can result in penalties. Many states have their own estimated payments too.

Track deductible expenses

Ordinary and necessary business expenses are generally deductible. Common examples include software, advertising, insurance, professional fees, supplies, a portion of phone costs, and business mileage. The home office deduction has a simplified method of $5 per square foot for up to 300 square feet, or a regular method based on actual expenses, if you meet the requirements. Keep records for every deduction.

Step 9: Handle contractors and 1099s

If you pay independent contractors, collect a Form W-9 before the first payment. You may need to file Form 1099-NEC for contractors you paid above the IRS threshold during the year. Legislation in 2025 raised that threshold for payments made from 2026 onward, so check IRS.gov for the current amount. Payments made by card or through payment apps are often reported by the processor on Form 1099-K instead.

Step 10: Sales tax and payroll

• Sales tax: if you sell taxable products or services, register with your state, collect the right rate, and file returns on schedule. Online sellers should understand economic nexus rules in states where they have significant sales.
• Payroll: when you hire employees, use payroll software or a provider to withhold taxes, file payroll returns and issue W-2s. Misclassifying employees as contractors creates serious liability.

A monthly bookkeeping routine

• ☐ Categorise all transactions
• ☐ Upload missing receipts
• ☐ Reconcile bank and card accounts
• ☐ Review unpaid invoices and send reminders
• ☐ Review the profit and loss and cash balance
• ☐ Transfer the tax set-aside
• ☐ Note anything to ask your accountant

Mistakes to avoid

1. Mixing personal and business transactions.
2. Waiting until tax season.
3. Not reconciling.
4. Missing estimated tax payments.
5. Throwing away receipts.
6. No W-9s from contractors.

When to hire a bookkeeper or accountant

Doing your own books makes sense at the start. Consider getting help when:

• You spend more than a few hours a month on bookkeeping.
• You have employees, inventory, or sales tax in multiple states.
• You are applying for a loan or bringing on investors.
• Your books are more than two months behind.
• You are considering an S corporation election or other tax planning.

A bookkeeper records and reconciles transactions. A CPA or enrolled agent prepares tax returns, gives tax advice and can represent you before the IRS. Many small businesses use a bookkeeper monthly and a CPA at year-end and for planning.

A year-end checklist

• ☐ Reconcile all accounts through December 31
• ☐ Review the profit and loss for miscategorised items
• ☐ Count inventory if you carry it
• ☐ Collect W-9s and prepare 1099s
• ☐ Review fixed asset purchases for depreciation
• ☐ Confirm payroll filings and W-2s
• ☐ Gather mileage and home office records
• ☐ Send your accountant a clean set of reports early

Questions readers ask

Cash or accrual accounting?

Most small businesses start with cash basis, recording income when received and expenses when paid. Accrual accounting records them when earned or incurred and gives a clearer picture for businesses with inventory or large receivables. Ask your accountant which fits.

Your next step

Open a business account if you have not, choose accounting software, and categorise last month's transactions. Then book a 30-minute session each month for the routine above.

The full guide, Bookkeeping & Taxes for Small Business Owners, covers setup, chart of accounts, monthly routines, financial reports, estimated taxes, deductions, 1099s, sales tax, payroll basics and year-end checklists for $0.99.