Double entry system, types of accounts and the rules of debit and credit

1. The double entry system

Every transaction involves an exchange of value between two accounts: one receives a benefit, the other gives it. The double entry system records both aspects — one account is debited and another credited with the same amount. Hence the total of all debits always equals the total of all credits, which is what the trial balance tests. The system was first described in print by the Italian friar Luca Pacioli in Summa de Arithmetica, Geometria, Proportioni et Proportionalita (Venice, 1494).

Features: two aspects of every transaction; equal debit and credit; a complete record of personal, real and nominal accounts; arithmetical accuracy can be checked by a trial balance; and final accounts can be prepared.

Advantages: a complete and scientific record; the profit or loss and the financial position can be found; errors and frauds are easier to detect; the amounts due to and by the business are known at any time; results can be compared between years; the accounts are accepted by tax authorities and courts.

Limitations: it is costly and needs trained staff for a small trader; and the trial balance does not catch every error (errors of omission, compensating errors and errors of principle, explained in Unit II).

2. Single entry and double entry distinguished

The “single entry system” is not a system at all but an incomplete form of double entry: usually only a cash book and personal accounts of debtors and creditors are kept, and real and nominal accounts are omitted.

3. English (traditional) approach: three kinds of accounts

1. Personal accounts — accounts of persons with whom the business deals.
   • Natural persons: Ramu A/c, Suresh A/c.
   • Artificial persons: Canara Bank A/c, Infosys Ltd. A/c, Rotary Club A/c.
   • Representative personal accounts: accounts that stand for a person or group, such as Outstanding Salaries A/c, Prepaid Insurance A/c, Capital A/c and Drawings A/c (both represent the proprietor).
   Rule: Debit the receiver, credit the giver.
2. Real accounts — accounts of assets and properties.
   • Tangible: Cash, Building, Machinery, Furniture, Stock.
   • Intangible: Goodwill, Patents, Trade marks.
   Rule: Debit what comes in, credit what goes out.
3. Nominal accounts — accounts of expenses, losses, incomes and gains: Salary, Rent, Wages, Advertisement, Commission received, Interest, Discount, Dividend.
   Rule: Debit all expenses and losses, credit all incomes and gains.

4. American (modern) approach: five kinds of accounts

The modern approach classifies accounts by their place in the accounting equation and applies a rule of increase and decrease.

Both approaches give the same entries. Example: rent paid Rs. 3,000 in cash. English approach: Rent is nominal (expense) — debit; Cash is real (goes out) — credit. American approach: expense increases — debit; asset (cash) decreases — credit.

5. Worked problem: classify the accounts (January 2026, 100-mark paper)

How this is examined

A 10-mark essay on the kinds of accounts and the two approaches (January 2026), a 6-mark distinction between single and double entry (January 2026), and a 10-mark classification problem (January 2026, 100-mark paper). For the essay, use the structure of sections 3 and 4: each kind of account, its sub-kinds with examples, its rule in bold, then the American table, then one transaction shown under both approaches. For the classification problem, a three-column table with a reason for each item is neater than a list and leaves the examiner no doubt.