Accounting & Bookkeeping Foundations
Start with the accounting equation, double-entry records, journals, ledgers, reconciliations and basic statements. Use fictional business records only; this course does not provide tax or individualized financial advice.
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01 · The accounting equationOpen lesson

Assets = liabilities + equity. Assets are resources controlled by a business; liabilities are obligations; equity is the residual interest after liabilities. Every properly recorded transaction preserves this relationship. Owner investment is different from revenue earned by providing a service, even though both can increase cash.
A business has $8,000 assets and $3,000 liabilities. Equity is $5,000. The equation is 8,000 = 3,000 + 5,000.
Try it yourself
Use the Equation Lab to solve for equity at different balances.
02 · Accounts and account typesOpen lessonLocked — complete previous lessons

A chart of accounts organizes asset, liability, equity, revenue and expense accounts. Use consistent names and enough detail to explain the business activity without making the records needlessly complex. A bank deposit needs a reason: it may be revenue, owner investment, a loan or repayment of a receivable. The bank movement alone does not identify its accounting meaning.
Cash is an asset; a bank loan is a liability; service fees earned are revenue; ordinary rent used for the period is expense.
Try it yourself
Classify cash, accounts payable, owner capital, sales revenue and rent expense.
03 · Debits, credits and balanced entriesOpen lessonLocked — complete previous lessons

Debit means the left side and credit the right side. They do not universally mean increase and decrease. Assets and expenses normally increase with debits; liabilities, equity and revenue normally increase with credits. Total debits and credits must be equal for an entry, but balance alone cannot prove that the correct accounts or amounts were chosen.
Buying $200 of supplies on credit: debit supplies $200 and credit accounts payable $200. Assets and liabilities both rise.
Try it yourself
Write the entry for paying $100 of an already-recorded supplier balance: debit payable $100, credit cash $100.
04 · Journals, ledgers and trial balancesOpen lessonLocked — complete previous lessons

A journal records transactions with dates, accounts, amounts and explanations. A ledger groups entries by account so balances can be calculated. A trial balance lists account balances to check total debits against total credits. An omitted transaction or posting to the wrong account may leave the trial balance balanced, so supporting documents and review are still necessary.
Two $100 entries posted to the wrong expense account can leave debit and credit totals equal while misclassifying the cost.
Try it yourself
Create a small journal and post its cash entries to a simple ledger.
05 · Cash, accruals and statementsOpen lessonLocked — complete previous lessons

Under accrual accounting, revenue and expenses are recognized according to the activity and applicable rules rather than only cash movement. Receivables and payables explain some timing differences. An income statement summarizes revenue and expenses over a period; a balance sheet shows assets, liabilities and equity at a point in time. Cash flow information describes cash movement.
A service is earned in June and paid in July. Under an accrual model, June may record revenue and a receivable; July collection reduces the receivable rather than earning the same revenue again.
Try it yourself
Explain why a profitable business can temporarily have little cash.
06 · Reconciliation and a reliable closeOpen lessonLocked — complete previous lessons

Reconciliation compares records with independent evidence and explains differences. For a bank reconciliation, deposits in transit and outstanding checks can explain timing differences; bank fees or errors may require book adjustments. Keep supporting records, review unusual balances and correct errors through documented entries. Do not force agreement by inventing an amount.
The bank shows a $12 fee not yet recorded in the books. Record the fee according to the business policy, then complete the reconciliation.
Try it yourself
Finish your five-transaction project and explain one potential timing difference.