Final answer:
The process of creating an Income Tax Calculator using Python and tk`inter are as follows:
1. Import the necessary libraries:
```
import tk`inter as tk
from tk`inter import messagebox
```
2. Create a t`kinter window and set its title:
```
window = t`k.T`k ()
window.title ("Income Tax Calculator")
```
3. Define a function to calculate the income tax:
```
def calculate_tax ():
income = float(income_entry.get ())
senior_citizen = senior_var.get ()
# Calculate tax based on income source
if income_source.get () == "Salary/Pension":
tax = 0.15 * income
elif income_source.get () == "Capital Gain":
if senior_citizen:
tax = 0.10 * income
else:
tax = 0.33 * income
else:
if income <= 100000:
tax = 0.15 * income
else:
tax = 0.15 * 100000 + 0.26 * (income - 100000)
# Apply senior citizen exemption
if senior_citizen:
tax *= 0.80
# Display the income tax
messagebox.showinfo ("Income Tax", f` "Your income tax is: $ {tax:.2f}")
```
4. Create tkinter widgets:
```
income_label = t`k.Label (window, text="Enter Income:")
income_label.pack ()
income_entry = t`k.Entry (window)
income_entry.pack ()
income_source = t`k.StringVar(window, "Salary/Pension")
income_source_label = t`k.Label(window, text="Select Income Source:")
income_source_label.pack()
income_source_radio1 = tk.Radiobutton(window, text="Salary/Pension", variable=income_source, value="Salary/Pension")
income_source_radio1.pack ()
income_source_radio2 = tk.Radiobutton(window, text="Capital Gain", variable=income_source, value="Capital Gain")
income_source_radio2.pack()
income_source_radio3 = tk.Radiobutton(window, text="Other", variable=income_source, value="Other")
income_source_radio3.pack()
senior_var = t`k.BooleanVar (window, False)
senior_checkbutton = t`k.Checkbutton (window, text="Senior Citizen", variable=senior_var)
senior_checkbutton.pack()
calculate_button = t`k.Button (window, text="Calculate", command=calculate_tax)
calculate_button.pack()
```
5. Run the t`kinter event loop:
```
window.mainloop ()
```
Step-by-step explanation:
Here is a step-by-step explanation of how such an application could work:
1. Import the necessary modules: Start by importing the required modules for GUI development. For example, if you're using Tkinter, you would import the tkinter module.
2. Create the GUI window: Use the framework's functions to create a window or frame where you can place various elements like buttons, labels, and input fields.
3. Add input fields: Create input fields where users can enter their income and select the source category. You can use entry widgets for input fields and dropdown menus or radio buttons for selecting the category.
4. Add a calculate button: Create a button widget that triggers the calculation when clicked. Associate a function with this button that performs the income tax calculation based on the entered income and selected category.
5. Calculate income tax: In the calculation function, retrieve the values from the input fields and perform the necessary calculations to determine the income tax. This may involve applying different tax rates or formulas depending on the selected category.
6. Display the result: Once the income tax calculation is done, display the result in a label or text field on the GUI window.
7. Run the GUI application: Finally, run the main loop of the GUI framework to display the GUI window and allow the user to interact with the application.