Bookkeeping Basics for a Small Business: What to Record and Why

Bookkeeping sounds like a job for an accountant, but at its heart it is just a habit: writing down every time money moves in or out of your business, with enough detail that you (or someone else) can understand it later. Done steadily, it tells you whether the business is making money, keeps tax time short, and gives you the paper trail you need if a client disputes a bill or the IRS asks a question.

This guide covers what bookkeeping is, which records to keep, the basic categories everything falls into, and a monthly routine that takes an hour or two for most small businesses.

What bookkeeping actually is

Bookkeeping is recording financial transactions. Accounting is what you do with those records afterward: analysing them, preparing statements and tax returns, and planning. A bookkeeper makes sure every sale, purchase, payment and transfer is written down once, in the right place, with the right amount.

For a sole proprietor or a single-member LLC, the records feed straight into the owner’s tax return. The Schedule C form a sole proprietor files asks for gross receipts on line 1 and expenses on lines 8 through 27b, ending in net profit or loss on line 31 (those line numbers are from the 2025 Schedule C; see the IRS instructions for Schedule C). If your books are sorted along those lines all year, filling in the form is mostly copying totals.

The records behind every entry

Every entry in your books should point back to a source document: something outside your own head that shows the transaction happened. Common ones:

Sales: invoices you sent, sales receipts, payment processor statements, deposit slips.
Purchases: receipts, vendor bills, credit card statements, canceled checks.
Bank activity: monthly bank and card statements.
Assets: purchase documents for equipment, vehicles and property, which you keep for as long as you own them and then some.
Payroll, if you have employees: time records, pay stubs and payroll tax filings.

A receipt alone is often not enough. Write on it (or in the note field of your records) what the purchase was for and, for a meal, who you met and the business purpose. Six months later, “$84, restaurant” means nothing.

How long to keep them

The IRS says to keep records for as long as they may be needed to support your return. In general that means 3 years, but 6 years if you failed to report income that is more than 25% of the gross income shown, 7 years for a claim for a bad debt or worthless securities loss, and at least 4 years for employment tax records. Records for property are kept until the period of limitations ends for the year you dispose of it. The details are on the IRS page How long should I keep records?. Digital copies are fine as long as they are legible and complete.

The five kinds of accounts

Everything a business records falls into one of five groups. Knowing them makes the rest of bookkeeping much easier to follow.

Income (or revenue): money you earn from selling goods or services. A $1,500 website project is income.
Expenses: costs of running the business. Software subscriptions, supplies, advertising, insurance.
Assets: things the business owns. Cash in the business bank account, money clients owe you, a laptop, a van.
Liabilities: what the business owes. A credit card balance, a loan, sales tax collected but not yet paid to the state.
Equity: the owner’s stake. What you put in, what you take out, and the profit left in the business.

Income and expenses tell you how the business performed over a period. Assets, liabilities and equity tell you where it stands on a given day. A sixth item, the owner’s draw, is technically part of equity: when you move $2,000 from the business account to your personal account, that isn’t an expense, and it shouldn’t reduce your profit.

Common mistakes worth avoiding

Mixing business and personal money. One account for both makes every statement a sorting job. A separate business account and card is the single biggest time saver.
Recording transfers as income or expenses. Moving money between your own accounts, or paying off the business credit card from the business checking account, isn’t income or an expense. It only changes where the money sits.
Counting loans as income. A $10,000 loan deposit is a liability, not revenue.
Letting it pile up. Three months of receipts in a shoebox is much harder to sort than three weeks.
Vague categories. If “Miscellaneous” is one of your biggest expense lines, nobody, including you, can tell what the business spends money on.

A simple monthly routine

Most small businesses don’t need daily bookkeeping. A short session once a month, on a fixed day, keeps things under control.

Gather the month’s documents. Download bank and card statements and collect receipts and invoices. Snap photos of paper receipts as you go so this step is quick.
Record or import every transaction. Most banks let you download a file of the month’s activity; bookkeeping software can import it or connect to the bank directly.
Categorize each one. Income by type, expenses by category (ideally the same categories your tax form uses), transfers as transfers, owner draws as draws.
Attach or file the source documents. Link each receipt to its transaction, or file it in a folder named for the month.
Reconcile. Check that your records match the bank statement: the same ending balance, with any difference explained.
Review who owes you. List unpaid invoices and follow up on any that are overdue.
Look at the totals. Income, expenses and profit for the month and the year so far. Set aside money for taxes if you pay estimated tax.

Here is what that looks like for a freelance designer in a typical month: $6,000 from three client payments, $420 of expenses (software, a printer cartridge, a coworking day pass), a $2,500 owner draw and a $300 transfer to a tax savings account. Profit for the month is $5,580. The draw and the transfer don’t change that figure; they only move money around.

When to get help

Simple bookkeeping is well within reach of most owners. Call a bookkeeper or accountant when you hire employees, when you start holding inventory, when you are unsure how to treat a large purchase, or when the business grows past the point where an hour a month keeps up. A tax professional can also tell you which accounting method and entity type suit you.

How Kemback fits

Kemback Business is the business side of Kemback, on the same sign-in as your personal finances. Its Small Business add-on gives each company its own double-entry books, with a chart of accounts mapped to Schedule C lines, reconciliation per account, invoices and bills, profit and loss, balance sheet and cash flow reports, and a Schedule C summary for a tax year. Transactions are categorised with Kemback’s rules and review inbox, and automatic bank sync through Plaid, part of Kemback Plus, is read-only: Kemback never sees or stores bank passwords. It doesn’t run payroll or file your return. If you own rental homes, Rental Houses keeps each home’s books on Schedule E lines. See pricing for both add-ons, or create an account.

This post is general information, not tax or legal advice. Rules change over time; check with a qualified tax professional for your situation.

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This article is general information, not financial, tax or legal advice. For decisions about your situation, talk to a qualified professional.