Accounting Glossary: 10 Terms Every Small Business Must Know

Most small business owners didn’t go to business school. You started a company because you’re good at what you do — not because you love debits and credits. But at some point, you need to read your own financial reports, have a real conversation with your accountant, and make decisions based on numbers you actually understand.

This accounting glossary isn’t a textbook. It’s the 10 bookkeeping terms that come up again and again when you’re running a small business. Each one gets a plain-English definition, a quick example, and a note on why it matters to your bottom line. Whether you’re in the US, UK, Ireland, or Canada, these are the terms you’ll see in every accounting software dashboard and every set of financial statements.

1. Accounts Receivable (AR)

Accounts receivable is the money your customers owe you for goods or services you’ve already delivered.

You sent the invoice. You did the work. But the cash hasn’t hit your bank account yet. That gap between “invoiced” and “paid” is your accounts receivable.

Why does this matter? Because AR is where cash flow problems hide. Your profit and loss statement might look great — revenue is up, margins are solid — but if your customers are taking 60 or 90 days to pay, your bank balance tells a very different story. If your AR is growing but your bank balance isn’t, you have a collections problem.

The key report to watch is the AR aging report, which groups unpaid invoices by how overdue they are: current, 30 days, 60 days, 90+ days. The older the bucket, the less likely you are to collect.

Example: You invoice a client $5,000 on March 1 with Net 30 payment terms. On March 15, that $5,000 is sitting in accounts receivable. If it’s still there on April 15, it moves into the “30 days overdue” bucket — and it’s time to pick up the phone.

In accounting software, AR usually updates automatically when you create and send invoices. The aging report is the first place to look when cash feels tight but your revenue numbers say otherwise.

2. Accounts Payable (AP)

Accounts payable is the money you owe to your suppliers and vendors for goods or services you’ve received.

AP is the mirror image of AR. Your suppliers sent you an invoice, you received the goods, but you haven’t paid yet. It’s a liability on your balance sheet — money that’s going to leave your account.

Managing AP well means understanding payment terms. If a supplier offers “2/10 Net 30,” they’re giving you a 2% discount if you pay within 10 days instead of 30. On a $10,000 invoice, that’s $200 for paying 20 days early. Over a year, those discounts add up fast.

The AP aging report works just like AR aging but in reverse — it shows what you owe and how overdue each bill is. Letting payables slide past their due date damages supplier relationships, can trigger late fees, and in some cases affects your credit terms.

Example: Your office supply vendor invoices you $1,200 on March 1 with Net 30 terms. That $1,200 sits in accounts payable until you pay it. If you schedule payment for March 28, you stay current. If it’s still unpaid on April 5, you’re past due.

Good accounting software lets you schedule payments, track due dates, and see your total payable obligations at a glance — so nothing slips through the cracks.

3. Chart of Accounts

The chart of accounts is your financial filing system — a structured list of every category where transactions can be recorded.

Think of it as the skeleton of your accounting. Every invoice, payment, expense, and journal entry gets filed into one of these categories. Revenue goes into revenue accounts. Rent goes into an expense account. That new laptop goes into an asset account. The structure of your chart of accounts determines how useful your financial reports will be.

This is the most important setup decision you’ll make in any accounting software. Get it right, and your reports tell you exactly where money is coming from and going to. Get it wrong — too many accounts, too few, or poorly named — and your financial statements become noise.

Most small businesses need somewhere between 30 and 60 accounts. If you have 200, you’re overcomplicating things. If you have 15, you’re probably lumping together expenses that should be tracked separately.

Example: Instead of a single “Office Expenses” account, you might split it into “Office Supplies,” “Software Subscriptions,” and “Office Rent.” Now when you review your P&L, you can see that software costs doubled this quarter — something a single bucket would have hidden.

Modern accounting platforms like Odiverse come with country-specific charts pre-configured — PGC for Spain, US GAAP-aligned for the United States, FRS 102 for Ireland and the UK. You get a sensible starting point instead of a blank page. From there, you customize to fit your business. For a deeper look at choosing the right platform, see our guide to the best AI ERP software for US small businesses.

4. Accrual vs Cash Accounting

Cash accounting records transactions when money changes hands. Accrual accounting records them when the obligation is created.

This distinction trips up a lot of business owners, but it’s simpler than it sounds.

Cash basis: You record revenue when the customer pays you, and expenses when you pay the supplier. Simple. Intuitive. Matches your bank statement.

Accrual basis: You record revenue when you earn it (when you deliver the product or complete the service), and expenses when you incur them (when you receive the goods) — regardless of when cash actually moves.

Why does it matter? Because the method you use changes what your financial statements look like. A cash-basis business might show a great month simply because a bunch of old invoices got paid at once. An accrual-basis business shows revenue in the month it was earned, giving you a clearer picture of actual performance.

Most countries require accrual accounting above a certain threshold. In the UK, all limited companies must use accrual. In the US, businesses with more than $29 million in gross receipts must use accrual under IRS rules. In Canada, most corporations use accrual, though sole proprietors under a certain size can use cash. Ireland follows UK GAAP (FRS 102), which is accrual-based for companies.

Example: You complete a consulting project in March and invoice $8,000. The client pays in May. Under cash accounting, March shows $0 revenue and May shows $8,000. Under accrual, March shows $8,000 — the month you actually did the work.

5. General Ledger

The general ledger is the master record of every financial transaction your business has ever made.

Every invoice you send, every bill you pay, every journal entry your accountant posts — it all ends up in the general ledger. If the chart of accounts is the filing system, the general ledger is every document in every folder.

For most small business owners, you won’t interact with the general ledger directly very often. Your accounting software maintains it behind the scenes. But understanding that it exists — and that it’s the single source of truth for all your financial data — helps you understand where your reports come from.

Your profit and loss statement? It’s a filtered view of the general ledger. Your balance sheet? Same thing. Every financial report is just a different way of slicing and summarizing what’s in the general ledger.

Example: On March 5, you pay $3,000 for office rent. The general ledger records this as a $3,000 debit to your Rent Expense account and a $3,000 credit to your Bank account. Both sides balance. That’s the “double entry” in double-entry bookkeeping — and the general ledger is where both sides live.

When something doesn’t add up in your reports, the general ledger is where your accountant goes to investigate. It’s the audit trail for your entire business.

6. Bank Reconciliation

Bank reconciliation is the process of matching your accounting records to your actual bank statement to make sure they agree.

This is the single most important habit in small business accounting. Full stop.

Every month, your bank sends a statement showing every transaction that cleared. Your accounting software has its own record of what should have happened. Bank reconciliation is comparing the two, line by line, and investigating any differences.

Those differences might be timing (a check you wrote that hasn’t cleared yet), errors (you recorded $500 but the bank shows $50), missing transactions (a direct debit you forgot to record), or — worst case — fraud (someone made a payment you didn’t authorize).

If you do nothing else in your accounting each month, do your bank reconciliation. It catches problems early, when they’re cheap to fix. Skip it for six months and you’ll spend days untangling the mess — or worse, you’ll miss something that costs you real money.

Example: Your books show a bank balance of $24,500. Your bank statement shows $23,800. After reconciling, you find three outstanding checks totaling $900 and a bank fee of $200 you hadn’t recorded. Once you account for those, both sides match. No surprises.

For more on building good financial habits, our article on common bookkeeping mistakes UK small businesses make covers the patterns that trip up most owners.

7. Depreciation

Depreciation spreads the cost of a long-term asset over its useful life, rather than recording the entire expense in the year you bought it.

When you buy something expensive that will last several years — equipment, vehicles, furniture, computers — you don’t expense the whole amount immediately. Instead, you spread the cost over the years you’ll use it. This matches the expense to the periods that benefit from the asset, and it affects your tax bill.

The rules vary by country. In the US, the IRS uses the Modified Accelerated Cost Recovery System (MACRS), which specifies recovery periods for different asset types — 5 years for computers, 7 years for office furniture, 39 years for commercial buildings. In the UK, depreciation is replaced by “capital allowances” for tax purposes, with the Annual Investment Allowance (AIA) letting you deduct up to a million pounds in the first year for qualifying assets. Canada uses Capital Cost Allowance (CCA) classes. Ireland follows similar capital allowance rules.

Example: You buy a $10,000 laptop for your business. Instead of deducting the full $10,000 this year, you depreciate it over 5 years. That’s roughly $2,000 per year showing up as an expense on your P&L. Your tax deduction is spread out, and your financial statements more accurately reflect the cost of running your business each year.

Your accounting software tracks asset values and calculates depreciation automatically — one less thing to do manually, and one less thing to get wrong at tax time.

8. Cash Flow Statement

The cash flow statement shows where your cash came from and where it went during a specific period.

This is the report that keeps businesses alive. Literally. Profitable businesses go bankrupt when they run out of cash. Your profit and loss statement won’t warn you about that. Your cash flow statement will.

It’s divided into three sections:

• Operating activities: Cash from your core business — collecting from customers, paying suppliers and employees. This is where most small businesses should focus.
• Investing activities: Cash spent on or received from long-term assets — buying equipment, selling a vehicle, investing in another company.
• Financing activities: Cash from or to lenders and owners — taking out a loan, repaying debt, owner draws, issuing shares.

The bottom line of the cash flow statement tells you whether your cash position increased or decreased during the period. A business can be profitable on paper and still have negative cash flow — if customers are paying slowly, if you’re investing heavily in inventory, or if you’re repaying a large loan.

Example: Your P&L shows $50,000 net profit for the quarter. But your cash flow statement shows cash decreased by $15,000. How? You bought $30,000 of equipment (investing), your accounts receivable grew by $25,000 (customers owe more), and you received a $10,000 loan repayment. Profit doesn’t equal cash. The cash flow statement explains the difference.

9. VAT / GST / Sales Tax

These are consumption taxes that businesses collect from customers on behalf of the government.

The name changes depending on where you are, but the concept is the same: when you sell something, you add a tax on top, collect it from the customer, and pass it along to the tax authority. You’re not paying this tax — you’re collecting it. Get it wrong and you’re paying penalties on someone else’s money.

VAT (Value Added Tax): Used in the UK (standard rate 20%), Ireland (23%), and across the EU. Businesses charge VAT on sales and reclaim VAT on purchases. You file VAT returns (quarterly in the UK under Making Tax Digital, bi-monthly in Ireland) and pay the difference.

GST/HST (Goods and Services Tax / Harmonized Sales Tax): Canada’s federal consumption tax. GST is 5% nationwide. Some provinces combine it with provincial sales tax into HST (ranging from 13% to 15%). Businesses register, collect, and remit.

Sales Tax: The US system. No federal sales tax — it’s state-level, and the rules vary wildly. Some states have no sales tax at all. Others have different rates by county and city. If you sell across state lines or online, you need to understand nexus rules. Our US sales tax nexus guide breaks down when and where you’re required to collect.

Example: You’re a UK business selling a product for $100. You charge $120 ($100 + 20% VAT). You bought materials for $60 + $12 VAT. When you file your VAT return, you owe $20 (VAT collected) minus $12 (VAT paid) = $8 to HMRC.

For UK businesses, see our detailed VAT guide for small businesses. If you’re in Ireland, we cover VAT registration, rates, and filing specifically for Irish businesses.

10. Payroll

Payroll isn’t just paying employees — it’s the entire system of calculating wages, withholding taxes, making statutory contributions, and filing with tax authorities.

Of all the accounting terms on this list, payroll is the one where getting it wrong has the most immediate consequences. Tax authorities don’t send gentle reminders about payroll errors — they send penalties.

Every country layers on its own requirements:

• US: Federal income tax withholding, Social Security and Medicare (FICA — 7.65% from the employee, 7.65% from the employer), state income tax in most states, FUTA and SUTA unemployment taxes, W-2s and quarterly 941 filings.
• UK: PAYE income tax, National Insurance (employee and employer), workplace pension auto-enrolment (minimum 8% total contribution), Real Time Information (RTI) reporting to HMRC every pay period.
• Ireland: PAYE, PRSI (Pay Related Social Insurance), USC (Universal Social Charge), auto-enrolment pension from 2025.
• Canada: Federal and provincial income tax, CPP/CPP2 contributions, Employment Insurance (EI) premiums, T4 slips and annual returns. For the full breakdown, see our Canadian payroll guide covering CPP, EI, and T4s.

Example: You hire an employee in the UK at $30,000 per year. Their take-home pay isn’t $30,000 divided by 12. After PAYE income tax, employee National Insurance, and pension contributions are deducted, their net pay is significantly lower. On top of that, you as the employer pay employer National Insurance (13.8%) and your share of pension contributions. The total cost of that employee to your business is well above the headline salary.

Payroll is the most regulated part of running a business in every country. It’s also the area where good software pays for itself fastest — automating calculations, generating payslips, filing with tax authorities, and keeping you compliant without a dedicated payroll team.

Understanding the Foundation

These 10 accounting terms are the foundation of small business accounting. You don’t need to become an expert in double-entry bookkeeping or memorize tax codes. But understanding what accounts receivable means, why bank reconciliation matters, and how cash flow differs from profit — that puts you in a fundamentally different position as a business owner.

You can read your own financial statements and know what the numbers mean. You can ask your accountant specific, informed questions instead of nodding along. You can spot problems — a growing AR balance, a negative cash flow despite profits, a missed bank reconciliation — before they become expensive.

The right accounting software handles the mechanics: posting journal entries, calculating depreciation, generating VAT returns. Your job is understanding what the outputs mean and making decisions based on them.

If you’re evaluating platforms for your business, our comparison of AI-powered ERP software for small businesses covers what to look for — including how modern tools handle the terms we’ve covered here.