Simple Billing System in Python for Class 11 CBSE Python

Last updated on August 22nd, 2025 at 08:23 pm

Python Program to Calculate Shopping Bill with Tax (Simple & Advanced)

When we go shopping, the bill usually contains two parts – the actual price of items and the tax applied.
In this article, we will learn how to create a Python program that calculates:

Bill amount (without tax)
Tax amount (calculated separately)
Final amount (with tax included)

We will write two versions of the program:

1. Simple Version (using loops + if-elif-else)

2. Advanced Version (using dictionary)

Version 1: Simple Python Program using if-elif-else

This version is written for beginners who know only loops, if, elif, else statements.

#Program: Bill with Different Tax Rate (Simple Version)
print("Available Products:")
print("1. Pen - 10 Rs (5% tax)")
print("2. Notebook - 50 Rs (12% tax)")
print("3. Pencil - 5 Rs (0% tax)")
print("4. Eraser - 8 Rs (5% tax)")
print("5. Bag - 700 Rs (18% tax)")
print("6. Shoes - 1200 Rs (28% tax)")
print("Enter 0 to finish shopping.\n")

bill_amount = 0
total_tax = 0

print("\n===== BILL DETAILS =====")
print("Product\tQty\tPrice\tTotal\tTax")

while True:
    choice = int(input("Enter product number (0 to stop): "))
    if choice == 0:
        break
    qty = int(input("Enter quantity: "))
    if choice == 1:
        price, tax_rate, name = 10, 5, "Pen"
    elif choice == 2:
        price, tax_rate, name = 50, 12, "Notebook"
    elif choice == 3:
        price, tax_rate, name = 5, 0, "Pencil"
    elif choice == 4:
        price, tax_rate, name = 8, 5, "Eraser"
    elif choice == 5:
        price, tax_rate, name = 700, 18, "Bag"
    elif choice == 6:
        price, tax_rate, name = 1200, 28, "Shoes"
    else:
        print("Invalid choice")
        continue

    item_total = price * qty
    item_tax = (item_total * tax_rate) / 100

    bill_amount += item_total
    total_tax += item_tax

    # Print each purchased item directly
    print(f"{name:8}\t{qty}\t{price}\t{item_total}\t{item_tax:.2f}")

final_amount = bill_amount + total_tax

print("-----------------------------")
print("Bill Amount (Without Tax): Rs", bill_amount)
print("Total Tax: Rs", round(total_tax, 2))
print("Final Amount (With Tax): Rs", round(final_amount, 2))
print("=============================")

Sample Output:

Available Products:
1. Pen - 10 Rs (5% tax)
2. Notebook - 50 Rs (12% tax)
3. Pencil - 5 Rs (0% tax)
4. Eraser - 8 Rs (5% tax)
5. Bag - 700 Rs (18% tax)
6. Shoes - 1200 Rs (28% tax)
Enter 0 to finish shopping.


===== BILL DETAILS =====
Product Qty Price Total Tax
Enter product number (0 to stop): 2
Enter quantity: 1
Notebook 1 50 50 6.00
Enter product number (0 to stop): 5
Enter quantity: 2
Bag 2 700 1400 252.00
Enter product number (0 to stop): 0
-----------------------------
Bill Amount (Without Tax): Rs 1450
Total Tax: Rs 258.0
Final Amount (With Tax): Rs 1708.0
=============================

Version 2: Advanced Python Program using Dictionary

In this version, we use a dictionary to store product price and tax rate together. This makes the program more flexible and easy to update.

# Program: Bill with Different Tax Rate (Advanced Version)

# Dictionary with product : (price, tax_rate%)
products = {
    "Pen": (10, 5),
    "Notebook": (50, 12),
    "Pencil": (5, 0),
    "Eraser": (8, 5),
    "Bag": (700, 18),
    "Shoes": (1200, 28)
}

cart = {}

print("Available Products (Price, Tax Rate):")
for item, (price, tax) in products.items():
    print(f"{item} - Rs{price} (Tax {tax}%)")

print("\nEnter 'done' when finished.\n")

while True:
    product = input("Enter product name: ").capitalize()
    if product.lower() == "done":
        break
    elif product in products:
        qty = int(input(f"Enter quantity of {product}: "))
        cart[product] = cart.get(product, 0) + qty
    else:
        print("Product not available. Please choose from the list.")

bill_amount = 0
total_tax = 0

print("\n===== BILL SUMMARY =====")
for item, qty in cart.items():
    price, tax_rate = products[item]
    item_total = price * qty
    item_tax = (item_total * tax_rate) / 100
    bill_amount += item_total
    total_tax += item_tax
    print(f"{item} (x{qty}) = Rs {item_total} | Tax @{tax_rate}% = Rs {item_tax:.2f}")

final_amount = bill_amount + total_tax

print("-------------------------")
print(f"Bill Amount (Without Tax): Rs {bill_amount}")
print(f"Total Tax: Rs {total_tax:.2f}")
print(f"Final Amount (With Tax): Rs {final_amount:.2f}")
print("=========================")

Sample Output:

Available Products (Price, Tax Rate):
Pen - Rs10 (Tax 5%)
Notebook - Rs50 (Tax 12%)
Pencil - Rs5 (Tax 0%)
Eraser - Rs8 (Tax 5%)
Bag - Rs700 (Tax 18%)
Shoes - Rs1200 (Tax 28%)

Enter 'done' when finished.

Enter product name: pen 
Product not available. Please choose from the list.
Enter product name: Pen
Enter quantity of Pen: 2
Enter product name: Notebook
Enter quantity of Notebook: 3
Enter product name: 
Product not available. Please choose from the list.
Enter product name: Bag
Enter quantity of Bag: 3
Enter product name: done

===== BILL SUMMARY =====
Pen (x2) = Rs 20 | Tax @5% = Rs 1.00
Notebook (x3) = Rs 150 | Tax @12% = Rs 18.00
Bag (x3) = Rs 2100 | Tax @18% = Rs 378.00
-------------------------
Bill Amount (Without Tax): Rs 2270
Total Tax: Rs 397.00
Final Amount (With Tax): Rs 2667.00
=========================

This version is suitable for Class 12 and project work, as it uses dictionary and is more professional. If you are just starting with Python and learning loops, if-elif-else, then go with Version 1 (Simple). If you are comfortable with dictionaries and lists, then try Version 2 (Advanced).Both programs clearly show bill amount, tax amount, and final amount separately.