JAMB Principles Of Accounts · Section A
Study notes for Principles of Double Entry — part of the JAMB UTME Principles Of Accounts syllabus. 3 learning objectives with explanations and exam tips.
Every business transaction affects two accounts. When you buy goods on credit from a supplier in Lagos, your Purchases account increases while your Creditors account also increases. This is the golden rule: debit one account and credit another account by the same amount. Think of it like a seesaw—when one side goes up, the other must go down to balance. If a trader receives cash from a customer, Cash increases (debit) while Sales Revenue increases (credit). Both sides of the equation must always balance. Assets equal liabilities plus capital. This system prevents fraud and catches errors quickly because unbalanced accounts show something went wrong. Without double entry, businesses would lose track of money and lose credibility with banks and investors.
Source documents are the original papers that prove business transactions happened. Think of them as evidence in court—they show what really occurred and how much money moved. Every transaction in accounting starts with a source document before anything gets recorded in the books.
Common examples include invoices (when you sell goods), receipts (when you receive payment), cheques (when you pay money), and debit notes (when goods are returned). In Nigeria, a trader at Lekki might receive a purchase invoice from a supplier in Lagos showing 50 bags of rice at ₦5,000 each. That invoice is the source document proving the transaction happened. Without it, there's no proof the business actually bought those goods.
Source documents are crucial because they prevent fraud and help auditors verify that transactions are genuine. They're your first step in the double entry process.
Source documents are the original papers that prove business transactions happened. Think of them as evidence. When a business buys goods on credit from a supplier, the supplier sends an invoice—that's the source document. In double entry bookkeeping, every transaction affects two accounts, and source documents guide you to record them correctly.
For example, when a Lagos trader buys fabric worth ₦50,000 from a wholesaler on credit, the invoice is the source document. You'll debit Purchases Account and credit Creditors Account. The invoice tells you exactly what happened, when it happened, and how much. Without source documents like invoices, receipts, cheques, and debit notes, you wouldn't know which accounts to use or how much to record.
Understanding this link between documents and accounts prevents recording errors.