Common Source Documents Explained

In the previous chapter, "What is an Accounting Voucher?", we learned that a voucher is the internal document an accountant prepares to tell the business exactly which accounts to debit and credit. But here is a crucial question: how does the accountant know a transaction actually happened?

An accountant cannot simply wake up, decide the business bought ₹50,000 worth of furniture, and write up a voucher for it. If they could, anyone could steal money from a business by just making up fake accounting entries.

In accounting, we follow the Objective Evidence Concept. This principle states that every single transaction recorded in the books of accounts must be supported by verifiable, objective, physical proof. You cannot record a purchase without proof of purchase. You cannot record a sale without proof of sale. You cannot record a bank deposit without proof from the bank.

This physical proof is called a Source Document.

Think of the accounting voucher as a judge in a courtroom, deciding how a transaction should be treated. The source document is the star witness. Without the witness providing hard evidence, the judge cannot make a ruling. Source documents are the origin point of the entire accounting process. They are the first pieces of paper (or digital files) generated when a transaction takes place.

In this chapter, we are going to break down the five primary source documents you will encounter in everyday accounting: the cash memo, the invoice (or bill), the receipt, the pay-in slip, and the cheque. We will look at what they are, when they are used, and exactly what information they must contain to be considered legally and professionally valid.

1. The Cash Memo: The King of Cash Transactions

Imagine you walk into a local electronics store, hand over ₹2,000 in cash, and buy a new keyboard. The shopkeeper hands you the keyboard and a small printed slip of paper. That slip of paper is a cash memo.

A cash memo is strictly for cash transactions. If you buy something on credit (meaning you promise to pay later), the seller will never give you a cash memo.

From the seller's perspective, the cash memo is the source document that proves cash came into the business and inventory went out. From the buyer's perspective, it is the source document that proves cash went out and an asset or expense came in.

What makes a Cash Memo valid?

For an accountant or an auditor to accept a cash memo as valid evidence, it cannot just be a blank piece of paper with "₹2,000" scribbled on it. It must contain specific, standardized information:

1. 1Name and Address of the Seller: Usually printed at the top (the letterhead).
2. 2Date of Transaction: Absolutely critical for recording the entry in the correct financial period.
3. 3Serial Number: Cash memos must be sequentially numbered (e.g., 001, 002, 003). This prevents a dishonest employee from tearing out a cash memo, selling goods, pocketing the cash, and pretending the sale never happened. If memo #004 is missing, the auditor will ask questions.
4. 4Description of Goods: What exactly was sold? (e.g., "Wireless Mechanical Keyboard").
5. 5Quantity and Rate: How many were sold, and at what price per unit? (e.g., "2 units @ ₹1,000 each").
6. 6Total Amount: The final amount paid, often shown in both numbers and words to prevent tampering.
7. 7Tax Details: Any GST (Goods and Services Tax) collected must be clearly shown.
8. 8Signature: The signature or stamp of the cashier or authorized person making the sale.

2. The Invoice or Bill: The Credit Champion

Now, let us change the scenario. Suppose you run a corporate office and you need 50 new keyboards. You go to the same electronics store, but you do not carry ₹50,000 in cash. Because you are a trusted corporate client, the store allows you to take the keyboards today and pay for them after 30 days.

The store will not issue a cash memo. Instead, they will issue an Invoice.

Invoice vs. Bill: Is there a difference?

In everyday conversation, people use these words interchangeably. But in accounting, the term depends entirely on who is holding the paper:

• To the Seller, it is an Invoice: When the electronics store prepares the document and sends it out to you, they call it a "Sales Invoice." It represents money they are owed (a debtor).
• To the Buyer, it is a Bill: When you receive that exact same piece of paper in your office, you call it a "Purchase Bill." It represents money you owe (a creditor).

It is the exact same physical piece of paper. The name just changes based on which side of the transaction you are standing on.

What makes an Invoice valid?

Because an invoice represents a promise to pay in the future, it requires a bit more detail than a simple cash memo. A valid invoice must contain:

1. 1Name and Address of the Seller: The entity demanding payment.
2. 2Name and Address of the Buyer: Unlike a cash memo (where the shopkeeper often doesn't care who you are as long as you have cash), an invoice must state exactly who owes the money.
3. 3Date of Issue: This dictates when the payment clock starts ticking.
4. 4Invoice Number: A unique, sequential serial number for tracking.
5. 5Description, Quantity, and Rate of Goods: Exactly what was sold.
6. 6Trade Discount: If the seller gave a bulk discount, it is deducted directly on the face of the invoice.
7. 7Tax Details (GST): Mandatory for commercial transactions.
8. 8Terms of Payment: This is the most crucial addition. It specifies when the money is due (e.g., "Net 30 Days" meaning payment is due in 30 days).
9. 9Signature: Authorized signature of the seller.

3. The Receipt: The Proof of Payment

Let us continue our story. Thirty days have passed, and it is time for your corporate office to pay the electronics store the ₹50,000 you owe them for the keyboards.

You send your accountant to the store with ₹50,000 in cash. The accountant hands over the cash. Now, the accountant needs proof that they actually paid the debt, otherwise the store could claim tomorrow that you still owe them money.

The store will issue a Receipt.

A receipt is usually issued when a customer makes a payment against a previously issued invoice, or when a business receives an advance payment.

The Revenue Stamp Rule

In India, there is a very specific legal requirement regarding cash receipts. Under the Indian Stamp Act, if a business receives a payment exceeding ₹5,000 in cash, the receipt must have a ₹1 Revenue Stamp affixed to it, and the receiver must sign across the stamp. This makes the receipt a legally binding document in a court of law. If the stamp is missing on a large cash payment, the receipt might not hold up in court if a dispute arises.

What makes a Receipt valid?

To properly close out a customer's debt in the accounting system, a receipt must show:

1. 1Name and Address of the Organization Receiving the Money: Printed at the top.
2. 2Date of Receipt: When the money was actually handed over.
3. 3Receipt Number: Sequentially numbered for internal control.
4. 4Name of the Payer: "Received with thanks from [Your Company Name]..."
5. 5Amount in Words and Figures: e.g., "₹50,000 (Rupees Fifty Thousand Only)". Writing it in words prevents someone from adding an extra zero to the numbers.
6. 6Purpose of Payment: What the money is for (e.g., "Advance for order" or "Payment against Invoice #1042").
7. 7Mode of Payment: Whether it was received in Cash, or by Cheque (including the cheque number and bank name).
8. 8Signature and Revenue Stamp: The receiver's signature, across a revenue stamp if the amount exceeds ₹5,000.

4. The Pay-in Slip: The Bank's Deposit Ticket

Now the electronics store has your ₹50,000 in cash. They don't want to leave it in the cash register overnight, so the shop owner takes it to their bank (say, State Bank of India) to deposit it into the business's current account.

When you deposit money into a bank, you don't just hand the cash to the teller and walk away. You have to fill out a specific form provided by the bank. This form is called a Pay-in Slip.

The Magic of the Counterfoil

A pay-in slip is unique because it is perforated (it has a tear-off line down the middle). It consists of two parts:

1. 1The Main Slip (Right side): This is the larger part. The bank keeps this along with your cash or cheque. It is the bank's internal source document to update their records.
2. 2The Counterfoil (Left side): This is the smaller part. The bank cashier stamps this with the official bank seal, signs it, tears it off, and hands it back to you.

For the business's accountant, the stamped counterfoil is the source document. It is the absolute proof that the cash was actually deposited into the bank on that date. Without this stamped counterfoil, the accountant cannot pass a voucher to increase the bank balance in the accounting books.

What makes a Pay-in Slip valid?

When filling out a pay-in slip, the depositor must provide:

1. 1Date of Deposit: The exact day the money goes to the bank.
2. 2Account Number and Branch: Where the money should be credited.
3. 3Name of the Account Holder: The business's name.
4. 4Details of Deposit:

• If depositing cash: You must list the denomination of notes (e.g., 100 notes of ₹500 = ₹50,000).
• If depositing a cheque: You must write the cheque number, date, and the name of the bank the cheque is drawn on.

1. 1Total Amount: In both words and figures.
2. 2Signature of the Depositor: The person actually standing at the bank counter handing over the money (it doesn't have to be the account holder; an office peon can sign as the depositor).
3. 3Bank's Stamp and Cashier's Signature: (On the counterfoil) This is what makes it a valid source document for the business.

5. The Cheque: The Bank's Order to Pay

Let us rewind to the moment you had to pay the electronics store ₹50,000. Instead of sending your accountant with a briefcase of cash, you decide to write a cheque.

A cheque is one of the most common source documents in modern business, acting as a substitute for cash.

The Three Parties to a Cheque

To understand a cheque, you must understand the three roles involved. This is a very common area for confusion, so let's define them clearly:

1. 1The Drawer: The person who writes and signs the cheque. (You, the buyer).
2. 2The Drawee: The bank that is ordered to pay the money. (Your bank, e.g., HDFC Bank). Note: The drawee of a cheque is ALWAYS a bank.
3. 3The Payee: The person or business to whom the money is to be paid. (The electronics store).

Crossing a Cheque

If you just write a cheque and hand it to the store owner, anyone who steals that piece of paper could potentially walk into a bank and demand cash over the counter. This is called a "Bearer Cheque."

To make it safe, businesses use Crossing. By drawing two parallel diagonal lines on the top left corner of the cheque (often writing "Account Payee Only" between them), you instruct the bank: Do not hand over cash for this. Only deposit this money directly into the bank account of the person named on the cheque.

For an accountant, a copy of the issued cheque (or the cheque book counterfoil/record slip) serves as the source document to record a payment made by the business.

What makes a Cheque valid?

Under the Negotiable Instruments Act, a cheque must be meticulously filled out. A single mistake can cause the bank to "bounce" (reject) it. It must contain:

1. 1Date: In India, a cheque is only valid for 3 months from the date written on it. If you write a cheque on January 1st, it becomes a useless piece of paper (a "stale cheque") on April 1st.
2. 2Name of the Payee: Exactly matching their bank account name.
3. 3Amount in Words and Figures: These must match perfectly. If the numbers say "₹50,000" but the words say "Fifty Thousand and One," the bank will reject it.
4. 4Signature of the Drawer: This must perfectly match the signature the bank has on file.
5. 5MICR Band: The magnetic ink numbers at the bottom of the cheque, which include the cheque number, city code, bank code, and branch code, allowing machines to process it.

Putting It All Together: The Document Flow

To truly master this topic, you need to see how these documents interact in the real world. Let's look at the lifecycle of a standard B2B (business-to-business) transaction.

Every single step in that flow generated a piece of paper. Those pieces of paper are the source documents. The accountant will gather the Invoice, the copy of the Receipt, and the Pay-in Slip counterfoil, attach them all to a single Accounting Voucher, and finally record the entry in the journal.

The voucher is the accounting summary; the source documents are the undeniable proof.

Quick Revision

Here are the high-yield points you must remember for the exam:

• Source Document: The original written evidence of a transaction (e.g., bills, receipts). It satisfies the Objective Evidence Concept.
• Cash Memo: Issued only for cash sales. Contains details of goods, quantity, rate, and total cash received.
• Invoice / Bill: Issued for credit sales. It is called an Invoice by the seller (who is owed money) and a Bill by the buyer (who owes money). It must state the terms of payment.
• Receipt: Issued when cash or a cheque is received. In India, cash receipts over ₹5,000 require a ₹1 revenue stamp to be legally binding.
• Pay-in Slip: Used to deposit cash/cheques into a bank. The counterfoil, stamped by the bank cashier, is the source document for the depositor.
• Cheque: An unconditional order to a bank to pay money. Valid for 3 months from the date of issue. The three parties are Drawer (maker), Drawee (bank), and Payee (receiver).
• Account Payee Crossing: Two parallel lines on a cheque ensuring the money is only deposited into a bank account, never paid as cash over the counter.