Special Purpose Books (Day Books) in Accounting
When a business is small, it is easy to record every single financial transaction in one master journal. However, as a business grows and the volume of transactions multiplies, relying on a single journal becomes slow, inefficient, and prone to errors.
To solve this, accountants use the subdivision of the journal. Instead of putting everything in one place, transactions of a similar nature are grouped and recorded in separate registers. These specialized registers are called Special Purpose Books, Subsidiary Books, or Day Books.
In this comprehensive guide, we will break down the four primary Day Books used to record credit transactions involving goods, complete with step-by-step numerical examples.
1. The Purchases Book (Purchase Journal)
The Purchases Book is a subsidiary book used specifically to record the credit purchase of goods.
- Only Credit Transactions: Cash purchases are strictly excluded (they belong in the Cash Book).
- Only "Goods": "Goods" refers to the items a business trades in. If a furniture store buys chairs to sell, it goes in the Purchases Book. If the same store buys a delivery truck (an asset), it goes in the Journal Proper, not the Purchases Book.
📝 Practical Numerical: Purchases Book
Record the following transactions in the Purchases Book of M/s Sharma Electronics for May 2026:
- May 02: Purchased from Apex Electronics on credit: 50 Laptops @ Rs. 30,000 each. Trade Discount @ 10%. (Invoice No. 101)
- May 08: Purchased from Vision Traders for Cash: 10 Mobile phones @ Rs. 15,000 each.
- May 15: Purchased from Zenith Computers on credit: 20 Printers @ Rs. 5,000 each. (Invoice No. 145)
Step-by-Step Solution & Logic
Gross Value = 50 Laptops × 30,000 = 15,00,000.
Less 10% Trade Discount (1,50,000) = Net Amount Rs. 13,50,000.
This was a cash purchase. It will be recorded in the Cash Book, not the Purchases Book. We ignore it completely here.
Net Amount = 20 Printers × 5,000 = Rs. 1,00,000.
Purchases Book of M/s Sharma Electronics
| Date (2026) | Particulars (Name of Supplier) | Inv. No. | L.F. | Details (Rs.) | Total Amount (Rs.) |
|---|---|---|---|---|---|
| May 02 | Apex Electronics 50 Laptops @ Rs. 30,000 each Less: 10% Trade Discount |
101 | 15,00,000 (1,50,000) |
13,50,000 |
|
| May 15 | Zenith Computers 20 Printers @ Rs. 5,000 each |
145 | 1,00,000 | 1,00,000 | |
| May 31 | Purchases Account ... Dr. | 14,50,000 | |||
2. The Sales Book (Sales Journal)
The Sales Book is the exact mirror image of the Purchases Book. It is used to record all credit sales of goods to customers.
- Only Credit Sales: Cash sales belong in the Cash Book.
- Only "Goods": The sale of old machinery, scrap, or other fixed assets on credit is not recorded here; it is recorded in the Journal Proper.
📝 Practical Numerical: Sales Book
Record the following transactions in the Sales Book of M/s Sharma Electronics for June 2026:
- Jun 05: Sold to Rakesh on credit: 10 Laptops @ Rs. 35,000 each. Trade discount @ 5%. (Invoice No. 201)
- Jun 12: Sold old office furniture to Amit on credit for Rs. 12,000.
- Jun 20: Sold to Mohit on credit: 5 Printers @ Rs. 6,000 each. (Invoice No. 202)
Step-by-Step Solution & Logic
Gross Value = 10 Laptops × 35,000 = 3,50,000.
Less 5% Trade Discount (17,500) = Net Amount Rs. 3,32,500.
This is the sale of an asset (old furniture), not trading goods. This goes to the Journal Proper. We ignore it here.
Net Amount = 5 Printers × 6,000 = Rs. 30,000.
Sales Book of M/s Sharma Electronics
| Date (2026) | Particulars (Name of Customer) | Inv. No. | L.F. | Details (Rs.) | Total Amount (Rs.) |
|---|---|---|---|---|---|
| Jun 05 | Rakesh 10 Laptops @ Rs. 35,000 each Less: 5% Trade Discount |
201 | 3,50,000 (17,500) |
3,32,500 |
|
| Jun 20 | Mohit 5 Printers @ Rs. 6,000 each |
202 | 30,000 | 30,000 | |
| Jun 30 | Sales Account ... Cr. | 3,62,500 | |||
3. The Purchases Return Book (Return Outward)
When goods purchased on credit are defective, damaged, or not up to standard, they are sent back to the supplier. This is recorded in the Purchases Return Book. The business sends a Debit Note to the supplier to inform them that their payable balance has been reduced.
📝 Practical Numerical: Purchases Return
Record the following transaction for M/s Sharma Electronics:
- May 18: Returned 2 defective Laptops to Apex Electronics (originally purchased on May 02 with a 10% Trade Discount). Issued Debit Note No. 51.
Step-by-Step Solution & Logic
Gross value of 2 Laptops = 2 × 30,000 = 60,000.
Less original 10% Trade Discount = 6,000.
Net Return Value = Rs. 54,000.
Purchases Return Book
| Date (2026) | Particulars (Name of Supplier) | Debit Note No. | L.F. | Details (Rs.) | Total Amount (Rs.) |
|---|---|---|---|---|---|
| May 18 | Apex Electronics 2 Defective Laptops returned Less: 10% Trade Discount |
51 | 60,000 (6,000) |
54,000 |
|
| May 31 | Purchases Return Account ... Cr. | 54,000 | |||
4. The Sales Return Book (Return Inward)
When a customer returns goods that were sold to them on credit, it is recorded in the Sales Return Book. The business issues a Credit Note to the customer, proving that the customer's outstanding debt has been reduced.
📝 Practical Numerical: Sales Return
Record the following transaction for M/s Sharma Electronics:
- Jun 10: Rakesh returned 1 Laptop (originally sold on Jun 05 with a 5% Trade Discount) due to a scratched screen. Issued Credit Note No. 81.
Step-by-Step Solution & Logic
Gross value of 1 Laptop = 35,000.
Less original 5% Trade Discount = 1,750.
Net Return Value = Rs. 33,250.
Sales Return Book
| Date (2026) | Particulars (Name of Customer) | Credit Note No. | L.F. | Details (Rs.) | Total Amount (Rs.) |
|---|---|---|---|---|---|
| Jun 10 | Rakesh 1 Laptop returned (Scratched) Less: 5% Trade Discount |
81 | 35,000 (1,750) |
33,250 |
|
| Jun 30 | Sales Return Account ... Dr. | 33,250 | |||
Advantages of Using Special Purpose Books
Implementing Day Books transforms the accounting process. Here is why modern businesses rely on them:
- Division of Labor: Multiple clerks can work simultaneously (e.g., one on the Sales Book, another on the Purchases Book), preventing bottlenecks.
- Increased Efficiency & Accuracy: Repeatedly recording the same type of transaction makes clerks faster and far less prone to errors.
- Easy Reference: Management can instantly see total credit sales or purchases for the month without hunting through hundreds of mixed journal entries.
- Fraud Prevention: By dividing tasks among different people, it becomes much harder for a single individual to manipulate the books without detection.
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