In this simplified accrual model, completed service creates revenue even if the customer pays later. Debit Accounts Receivable (an asset) and credit Service Revenue. Later collection debits Cash and credits Accounts Receivable, not revenue again. Expenses increase with debits and reduce profit. Before closing entries, a trial balance lists each ending account balance once: total debits should equal total credits. Equal totals do not prove the records are complete or correct.
Worked example
Separate example: owner cash 70; completed service billed 18; customer pays 6; a current expense costs 4 cash. Cash = 72, Receivable = 12, Expense = 4 (debit balances). Capital = 70 and Revenue = 18 (credits). Each side totals 88. Profit is 18 - 4 = 14, not the cash balance.
Service workshop: one period
Start with zero balances. T1: owner contributes 100 cash. T2: complete and bill a customer 45 for a service. T3: receive 20 toward that same bill. T4: pay 8 cash for this period's electricity, consumed now. Use fictional dollars and accrual accounting before closing entries. No other transactions, tax, fees, depreciation or adjustments apply. Do not use real financial records.