Small business bookkeeping: a simple system that takes an hour a month

Bookkeeping has a reputation it doesn't deserve. For most small businesses, it isn't a skill so much as a habit: record every transaction in the right place, keep the evidence, and look at the numbers once a month. Software does most of the recording now. Your job is the hour of judgment it can't do for you.

Done well, it saves money twice. Your accountant spends less time untangling your year, so the tax bill for their time is smaller. And you see problems, such as a client who hasn't paid or a subscription you forgot to cancel, while they're still cheap to fix.

What bookkeeping is, and what it isn't

Bookkeeping is recording what came in and what went out, in categories, with evidence. It produces the two reports every small business needs: a profit and loss statement, showing income and expenses over a period, and a balance sheet, showing what the business owns and owes at a point in time.

Accounting and tax preparation sit on top of that. An accountant uses your books to prepare tax returns, advise on structure and spot deductions. If the books are a mess, they spend the first part of their time, at their rate, fixing them.

Cash or accrual?

There are two ways to decide when a transaction counts.

• Cash method. Income is recorded when you receive it, and expenses when you pay them. Your books match your bank account, which makes them easy to check.
• Accrual method. Income is recorded when you earn it, such as when you send an invoice, and expenses when you incur them, even if no money has moved yet. It gives a truer picture when there's a gap between doing the work and being paid.

Most small businesses use the cash method, and it's the simpler place to start. Businesses with inventory, long payment terms, investors or loans often need accrual, and some larger businesses must use it. If you're not sure, ask your accountant before you set up the software, since switching later is a formal change.

Set up once

Separate the money

Open a business bank account and use a business card for every business expense. Pay yourself by transferring money to your personal account, never by paying personal bills from the business. This one habit does more for your books, and for your liability protection, than anything else. Our guide to opening a business bank account covers the setup.

Choose software

Accounting software connects to your bank and card, imports every transaction, and learns how to categorize the regular ones. QuickBooks Online and Xero are the two most common choices for small businesses, and both are widely supported by accountants. Free options exist for very simple businesses. Our comparison of QuickBooks, Xero and FreshBooks helps you choose.

Before you pick, ask your accountant which software they prefer. Using the one they know makes their work, and your bill, smaller.

Keep the categories short

Your chart of accounts is the list of categories every transaction goes into. Software comes with a long default list. Most small businesses need far fewer. A simple service business might use:

• Income: sales or services, and other income such as interest.
• Cost of sales: contractors who deliver client work, and materials.
• Operating expenses: software and subscriptions, advertising and marketing, professional fees (legal and accounting), office and supplies, rent, phone and internet, travel, meals, insurance, bank and payment fees, and payroll if you have employees.
• Balance sheet items: your bank accounts, credit cards, loans, money owed to you, sales tax collected, and owner contributions and draws.

Line your expense categories up with the lines on your tax return. For a single-member LLC or sole proprietor, that's Schedule C, and IRS Publication 334 explains what belongs where. Your accountant can then move numbers straight across.

The monthly hour

Put a recurring hour in your calendar in the first week of each month, and work through the same steps every time.

1. Categorize transactions. Review everything the bank and card feeds imported. Confirm or correct the category. Create rules for recurring items so they categorize themselves next month.
2. Attach receipts. Match a receipt to every expense the software flags. Most tools let you snap a photo or forward an email receipt.
3. Reconcile. Check that the software's balance for each account matches the bank or card statement at month end. Reconciling catches duplicates, missing transactions and bank errors.
4. Chase what you're owed. Look at unpaid invoices and follow up on anything overdue.
5. Check what you owe. Look at upcoming bills and anything you've missed.
6. Read the profit and loss. Compare it with last month and the same month last year. Look for anything surprising, in either direction.
7. Set aside tax. Move a percentage of the month's profit into a separate tax account, ready for estimated tax payments. Our guide to quarterly estimated taxes explains how much and when.

At first this takes longer than an hour. Once rules and habits are in place, most small businesses get it under an hour.

Receipts and records the IRS expects

The IRS says your records should show where your income came from and support every expense. For purchases and expenses, supporting documents should identify the payee, the amount, proof of payment, the date and a description showing it was for the business. Invoices, card statements, receipts and electronic payment records all count. Travel, gifts, vehicles and meals have stricter rules, covered in IRS Publication 463.

How long to keep them depends on your situation. The IRS's general rule is three years from when you filed. Keep employment tax records for at least four years, records for a bad debt or worthless securities deduction for seven, and records for six years if you left out income of more than 25% of what you reported. Keep records for assets until the period after you sell them. If you didn't file a return, or filed a fraudulent one, there is no time limit.

A digital copy attached to the transaction in your software is the easiest way to keep all this findable for years.

The owner's money

Owner transactions confuse more small business books than anything else.

• Money you put in is an owner contribution, not income.
• Money you take out of a single-member LLC is an owner's draw, not an expense. It doesn't reduce your profit for tax.
• Salary from an S corporation is a payroll expense, run through payroll.

Our guide to paying yourself from an LLC covers each case.

Contractors and 1099s

Before you pay a contractor for the first time, collect a Form W-9 with their name, address and taxpayer ID. At year end, you generally file Form 1099-NEC for each non-employee you paid for services above the reporting threshold. For payments made after December 31, 2025, that threshold is $2,000, up from the $600 that applied for decades, and it will rise with inflation after 2026. Payments made by card or through a payment platform are usually reported by the platform instead, so tag contractor payments by how they were paid.

Year end

In January, finish the December monthly hour, then pull together what your accountant will ask for: the profit and loss and balance sheet for the year, bank and card statements for December, a list of assets bought during the year, loan statements, contractor payments and any 1099s you filed, and inventory counts if you hold stock. Many accountants can log in to your software directly, which saves exporting anything.

Do it yourself, or hand it off?

• Do it yourself while transactions are few and simple, perhaps up to a hundred a month. The monthly hour is real work, but it keeps you close to the numbers.
• Hire a part-time bookkeeper once the hour becomes three, or once you have payroll, inventory or several accounts to reconcile.
• Use an online bookkeeping service if you want monthly books closed for you on a fixed fee. Our comparison of online bookkeeping services covers what they cost.

Even with help, read your profit and loss every month. Outsourcing the recording is sensible. Outsourcing the attention isn't.

Mistakes that cost the most to fix

• Mixing personal and business spending, which makes every transaction a question.
• Waiting until tax season to categorize a year of transactions.
• Never reconciling, so duplicates and missing items pile up unseen.
• Recording owner draws as expenses, which understates profit.
• Losing receipts for larger expenses and anything with special IRS rules.

Avoid those five, and your books will be better than most, in an hour a month. If you're starting from a backlog, don't try to fix every past month at once. Start clean from this month, then work backward a month at a time until the year is done.