Accounting Cycle, Accounts & Double-Entry System – Comprehensive Study Notes

The Four-Step Accounting Cycle

  • Accounting (bookkeeping) inside any company can be split into four sequential phases, each feeding the next.
    1. Source documents ➜ Transaction identification
    • Invoices, bank slips, contracts, receipts, etc. provide raw evidence.
    • Accountants analyse these papers to decide “what happened?” and “which accounts change?”.
    1. Recording ➜ The Journal (Book of original entry)
    • Every identified transaction receives a dated, chronologically ordered journal entry.
    • Each entry shows the accounts involved, the amounts, and whether the amount is a debit (left) or a credit (right).
    1. Posting ➜ The Ledger (Book of final entry)
    • Information is re-organised account-by-account.
    • For every single account you can now see: all debits, all credits, running totals, and the ending balance.
    1. Trial Balance ➜ Starting point for Financial Statements
    • A list of all ledger account balances, separated into debit-balance and credit-balance columns.
    • Provides an immediate arithmetic check that total debits = total credits before building the Balance Sheet and the Income Statement.

Step 1 – Source Documents & Transaction Identification

  • Purpose: capture changes occurring inside the company.
  • Changes must be interpreted through the accounting equation to keep books balanced.
  • The equation: Assets=Liabilities+Equity\text{Assets}=\text{Liabilities}+\text{Equity}
  • Expanded form (shows why revenues & expenses matter):
    Assets=Liabilities+Capital+Revenues−Expenses−Withdrawals\text{Assets}=\text{Liabilities}+\text{Capital}+\text{Revenues}-\text{Expenses}-\text{Withdrawals}
  • For every change, an account must exist (or be created) to host the amount.

Step 2 – The Journal

  • Also called the book of original entry because it is the first place amounts hit the accounting system.
  • Each journal line typically includes:
    • Date
    • Unique transaction/reference number
    • Debit account name & code with amount
    • Credit account name & code with amount
    • Brief description / narration
  • Example journal layout for 20-Feb; transaction #1 248 (see full worked example later).
  • In big multinationals millions of such lines can be generated annually.

Step 3 – The Ledger

  • Compilation of all T-accounts.
  • Lets users quickly inspect “Account 123 – Accounts Receivable” and see every debit/credit posted to it during the year.
  • Balances extracted from here feed the trial balance.

Step 4 – Trial Balance & Financial Statements

  • Trial Balance lists every account and its ending balance: debit vs credit.
  • If ∑Debits≠∑Credits\sum \text{Debits} \ne \sum \text{Credits}, an error exists.
  • A balanced trial balance becomes:
    • The Balance Sheet (uses balances of Assets, Liabilities, Equity)
    • The Income Statement / Profit & Loss (uses Revenues, Expenses, Gains, Losses)

Classification & Catalogue of Accounts (Chart of Accounts)

  • Chart of Accounts (CoA) = master list of all possible accounts the entity may use.
    • Small business: 20-30 accounts may suffice.
    • Multinational: several thousand accounts.
  • Usually organised in a three-digit numeric hierarchy; examples:
    • 101 Cash
    • 112 Accounts Receivable
    • 253 Long-Term Leasing
    • 301 Capital
  • Broad groupings (illustrative list mentioned in the lecture):
    1. Assets
    • Current Assets (cash, banks, inventory, accounts receivable)
    • Long-Term Investments
    • Property, Plant & Equipment (PPE) / Plant Assets
    • Natural Resources, Intangibles
    1. Liabilities
    • Current Liabilities (accounts payable = suppliers, unearned revenue, notes payable)
    • Long-Term Liabilities (loans, mortgages, bonds)
    1. Equity
    • Owners’/Shareholders’ Capital (paid-in)
    • Reserves
    • Retained Earnings
    1. Revenues (sales, service revenue, interest revenue)
    2. Expenses (cost of sales, wages, rent, utilities, depreciation)
    3. Gains & Losses
    4. Clearing / Contra / Closing accounts (temporary holding areas used during year-end procedures)
  • The CoA is the reference dictionary every data-entry clerk and every automated system must quote when posting transactions.

The T-Account Model

  • Visual aid shaped like the letter “T”.
    • Left side = Debit (Dr)
    • Right side = Credit (Cr)
  • Each account has:
    • Name / Code at the top.
    • Columns for debits and credits.
    • Balance = (Total debits – Total credits) if normal balance is debit, or vice-versa.
  • Example from the transcript:
    • Land account shows two debits of 100 & 150 and one credit of 100 ➜ balance 150  Dr150\;\text{Dr}.
    • Loan account shows one credit 200 and one debit 50 ➜ balance 150  Cr150\;\text{Cr}.

Debit & Credit Rules by Category (Normal Balances)

  • Assets increase with debits, decrease with credits.
  • Liabilities increase with credits, decrease with debits.
  • Equity behaves like liabilities (it sits on the right side of the equation)
    • Increases ➜ credit
    • Decreases ➜ debit (e.g., withdrawals/dividends)
  • Revenues act like equity: increasing revenue is a credit.
  • Expenses are the opposite: increasing expense is a debit.

Double-Entry System – Core Principles

  1. Every transaction affects at least two accounts.
  2. Total amount debited = total amount credited ⟹ keeps Assets=Liabilities+Equity\text{Assets}=\text{Liabilities}+\text{Equity} intact.
  3. Entries may involve any mix (Asset vs Asset, Asset vs Liability, Asset + Liability vs Equity, etc.).

Worked Example – €1 000 000 Machine Purchase

Scenario

  • Company buys a machine costing €1 000 000.
  • Financed 50 % with a long-term leasing contract and 50 % with additional shareholder capital.

Accounts involved & CoA codes (per lecture):

  • Machine (PPE) – 169 – Asset
  • Long-Term Leasing – 253 – Liability
  • Capital – 301 – Equity

T-Account postings

AccountDrCr
Machine (169)€1 000 000–
Long-Term Leasing (253)–€500 000
Capital (301)–€500 000

Journal entry (20-Feb, #1 248)

  • Debit Machine 169 €1 000 000
  • Credit Long-Term Leasing 253 €500 000
  • Credit Capital 301 €500 000
  • Narrative: “Purchase of machinery financed 50 % by leasing, 50 % by shareholder capital injection.”

Arithmetic check
Total Debits=1 000 000=Total Credits(500 000+500 000)\text{Total Debits}=1\,000\,000=\text{Total Credits}(500\,000+500\,000) ✔️

Practical & Real-World Considerations

  • Volume: large entities may process millions of lines; robust IT systems are essential.
  • Granularity: thousands of accounts enable detailed managerial analysis (e.g., separate revenue streams, regional cost centres).
  • Regulation & Local GAAP: three-digit coding is common but exact numbering schemes differ country-by-country.
  • Ethical/Accuracy Implications: Correct classification and balanced entries safeguard stakeholder trust and comply with legal reporting duties.
  • Year-End Closure: Once books are closed, temporary (clearing) accounts are zeroed out so a new cycle can begin next period.

Key Terminology Recap

  • Journal – chronological diary of debits & credits.
  • Ledger – collection of all T-accounts.
  • Trial Balance – list of ending balances; gateway to statements.
  • Chart of Accounts – master index of possible account codes & names.
  • Debit/Credit – left/right side of every account; mechanisms to record value shifts.
  • Double-Entry – methodology guaranteeing that the accounting equation always balances.
  • Expanded Accounting Equation – shows that revenues increase equity and expenses decrease equity.

By systematically applying these concepts, accountants transform raw source documents into structured, reliable financial statements that portray a company’s financial position and performance.