Accounting Fundamentals for Business Owners

Quick answer

Accounting turns your day-to-day transactions into three reports: an income statement that shows whether you made a profit, a balance sheet that shows what you own and owe, and a cash flow statement that shows where your cash went. Every entry follows one rule: assets equal liabilities plus equity. For Canadian tax purposes, most self-employed businesses must report income on the accrual basis, and the Canada Revenue Agency (CRA) generally expects you to keep your records for six years.

Figures in this guide apply to 2026 and were checked against CRA pages in September 2026.

Key takeaways

• Profit and cash are different numbers. You need all three statements to see the full picture.
• Under the accrual method, you record income when you earn it and expenses when you incur them, not when money moves.
• GST/HST you charge customers is not your revenue. It is money you hold in trust and owe to the CRA.
• A simple, consistent chart of accounts makes every report, tax return and conversation with your accountant easier.
• Keep supporting documents, such as invoices, receipts and bank statements, generally for six years from the end of the last tax year they relate to.

What your accounting records do for you

Bookkeeping is the recording of transactions. Accounting is organizing those records so you can understand them and report on them. For an owner, good records do four jobs:

• Show performance. Which months, services or products actually make money.
• Support your tax filings. Your income, deductible expenses and GST/HST input tax credits all come from your records.
• Protect you in a review. The CRA notes that if your records are incomplete, it may have to use other methods to determine your income.
• Inform decisions. Pricing, hiring, borrowing and cash planning all start with reliable numbers.

The three main financial statements

Each statement answers a different question. Reading them together is what gives you control.

Statement	Question it answers	Covers
Income statement (profit and loss, or P&L)	Did the business make or lose money?	A period, such as a month or year
Balance sheet	What does the business own, what does it owe, and what is left for the owner?	A single date
Cash flow statement	Where did cash come from and where did it go?	A period

A business can show a healthy profit on its income statement and still run short of cash. Unpaid customer invoices, equipment purchases and loan repayments all affect cash differently than they affect profit. The worked example below shows how this happens.

Accrual vs cash basis

The two methods differ only in timing.

• Accrual method: report income in the period you earn it, no matter when you receive it, and deduct expenses in the period you incur them.
• Cash method: report income when you receive it and deduct expenses when you pay them.

In its guide for self-employed business and professional income (T4002), the CRA says farmers, fishers and self-employed commission agents can use either method, and all other self-employment income must be reported using the accrual method. Corporations have their own reporting requirements, so confirm your situation with your accountant.

Even if you track cash day to day, accrual-based reports give a more accurate picture of each month, because they match income with the costs of earning it.

Double-entry, the accounting equation and your chart of accounts

Every accounting system rests on one equation:

Assets = Liabilities + Equity

Assets are what the business owns, such as cash, customer receivables and equipment. Liabilities are what it owes, such as supplier bills, loans and GST/HST payable. Equity is the owner’s stake: money put in, plus profits kept in the business.

Double-entry bookkeeping keeps the equation in balance. Every transaction touches at least two accounts, recorded as debits and credits of equal value. Pay a $500 bill from the bank and cash goes down while accounts payable goes down by the same amount. Software handles most of this, but knowing the logic helps you spot errors.

The chart of accounts is the list of categories your transactions are sorted into. It usually has five groups: assets, liabilities, equity, revenue and expenses. Keep it short and consistent. Adding a new account for every vendor makes reports harder to read, not easier.

Sales tax belongs in liabilities

If you are registered for GST/HST, the tax you charge is not income. The CRA states that you hold in trust the GST/HST amounts you collect from your customers. Record it in a GST/HST payable account. GST/HST you pay on eligible business purchases can usually be claimed as input tax credits, which reduce what you owe. For the full picture, see how GST/HST works for small businesses in Canada.

Worked example: one month for an Ontario service business

Transaction	Income statement effect	Balance sheet effect
Invoices a client $10,000 + $1,300 HST	Revenue +$10,000	Receivables +$11,300; HST payable +$1,300
Client pays half: $5,650	None	Cash +$5,650; receivables −$5,650
Pays rent $2,000 + $260 HST	Rent expense $2,000	Cash −$2,260; HST payable −$260 (input tax credit)
Buys a laptop $1,500 + $195 HST	None (it is an asset, not an expense this month)	Equipment +$1,500; cash −$1,695; HST payable −$195
Receives a software bill $300 + $39 HST, unpaid	Software expense $300	Accounts payable +$339; HST payable −$39

Income statement for the month: revenue $10,000, less expenses of $2,300, equals net income of $7,700.

Balance sheet at month end	Amount
Cash	$6,695
Accounts receivable	$5,650
Equipment	$1,500
Total assets	$13,845
Accounts payable	$339
HST payable ($1,300 − $494 in input tax credits)	$806
Total liabilities	$1,145
Owner’s equity ($5,000 invested + $7,700 net income)	$12,700
Total liabilities and equity	$13,845

The equation balances. Notice that Priya earned $7,700 in profit, but her bank balance rose by only $1,695. Half the invoice is still unpaid, and the laptop used cash without reducing profit. The $806 of HST is not hers to spend. You can test your own numbers with the profit margin calculator and the cash flow calculator.

What the CRA expects from your records

The CRA says you are required by law to keep records of all your transactions to support your income and expense claims. In practice, that means:

• Keeping supporting documents, such as sales invoices, receipts, contracts, deposit slips and bank statements.
• Keeping separate records for each business you run.
• Keeping records that were created electronically in an electronic readable format, even if you also have paper printouts.
• Keeping records generally for six years from the end of the last tax year they relate to. Some records, such as those for property acquisitions, must be kept longer, and different periods apply in specific situations, such as late-filed returns.

A regular month-end routine keeps all of this manageable: file documents as they arrive, reconcile your bank accounts and review your reports before starting the next month.

Common mistakes

• Treating your bank balance as your profit.
• Recording GST/HST collected as sales revenue.
• Expensing equipment purchases that should be recorded as assets.
• Mixing personal and business transactions in one account.
• Letting bookkeeping pile up until tax time, when receipts are missing and details are forgotten.
• Building an oversized chart of accounts that nobody uses consistently.

Frequently asked questions

How often should I review my financial statements?

Monthly is a practical rhythm for most small businesses. It catches errors while they are easy to fix and gives you time to act on cash problems. The free Small Business Financial Review Checklist, linked below, walks through what to look at.

When should I get help with my books?

Consider help when you are months behind, when your accounts never reconcile, when you start collecting GST/HST or hiring staff, or when bookkeeping takes time you would rather spend on the business. If you’d rather have help keeping your books, see Ronidex’s bookkeeping and accounting support.

Related on Ronidex

• Why is my business profitable but I have no cash?
• Month-end close for small businesses
• Free download: Small Business Financial Review Checklist, on the resources page