Create app.py

app.py

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+import gradio as gr
+import pandas as pd
+
+# Create the tax rule DataFrame
+data = {
+    "Salary Range (Million Toman)": ["0 - 12", "12 - 16.5", "16.5 - 27", "27 - 40", "Above 40"],
+    "Tax Rate (%)": [0, 10, 15, 20, 30],
+    "Description": [
+        "Exempt from tax", 
+        "10% tax for this range", 
+        "15% tax for this range", 
+        "20% tax for this range", 
+        "30% tax for this range"
+    ]
+}
+
+df = pd.DataFrame(data)
+
+def calculate_tax(salary):
+    insurance = salary * 0.07  # 7% insurance deduction
+    tax = 0
+    
+    if salary <= 12:
+        tax = 0
+    elif salary <= 16.5:
+        tax = (salary - 12) * 0.10
+    elif salary <= 27:
+        tax = (16.5 - 12) * 0.10 + (salary - 16.5) * 0.15
+    elif salary <= 4.0:
+        tax = (16.5 - 12) * 0.10 + (27 - 16.5) * 0.15 + (salary - 27) * 0.20
+    else:
+        tax = (16.5 - 12) * 0.10 + (27 - 16.5) * 0.15 + (40 - 27) * 0.20 + (salary - 40) * 0.30
+    
+    net_income = salary - tax - insurance
+    cost_percent = ((tax + insurance) / salary) * 100  # percentage of total cost
+    return f"Tax: {tax:.3f} Million Toman", f"Insurance: {insurance:.3f} Million Toman", f"Net Salary: {net_income:.3f} Million Toman", f"Cost Percentage: {cost_percent:.2f}%"
+
+def reverse_calculate(actual_income):
+    low = 0.0  # minimum salary boundary
+    high = actual_income / 0.93 * 1.5  # estimate upper bound
+    gross_salary = 0
+
+    # Using binary search to find the correct gross salary
+    while high - low > 0.0001:
+        mid = (low + high) / 2
+        net_income_from_mid = float(calculate_tax(mid)[2].split()[2])
+        if net_income_from_mid < actual_income:
+            low = mid
+        else:
+            high = mid
+    
+    gross_salary = (low + high) / 2
+    tax, insurance, _, _ = calculate_tax(gross_salary)
+    cost_percent = ((gross_salary - actual_income) / gross_salary) * 100
+    return f"Tax: {tax}", f"Insurance: {insurance}", f"Gross Salary: {gross_salary:.3f} Million Toman", f"Cost Percentage: {cost_percent:.2f}%"
+
+# Gradio app interface
+with gr.Blocks() as interface:
+    gr.Markdown("### Iran Salary Tax Calculator (1403) - Million Toman")
+
+    with gr.Row():
+        with gr.Column():
+            salary_input = gr.Number(label="Enter Gross Salary (Million Toman)", precision=3)
+            tax_output = gr.Textbox(label="Tax")
+            insurance_output = gr.Textbox(label="Insurance")
+            net_income_output = gr.Textbox(label="Net Salary")
+            cost_percent_output = gr.Textbox(label="Cost Percentage")
+            salary_input.change(fn=calculate_tax, inputs=salary_input, outputs=[tax_output, insurance_output, net_income_output, cost_percent_output])
+        
+        with gr.Column():
+            actual_income_input = gr.Number(label="Enter Net Salary (Million Toman)", precision=3)
+            reverse_tax_output = gr.Textbox(label="Tax")
+            reverse_insurance_output = gr.Textbox(label="Insurance")
+            gross_salary_output = gr.Textbox(label="Gross Salary")
+            reverse_cost_percent_output = gr.Textbox(label="Cost Percentage")
+            actual_income_input.change(fn=reverse_calculate, inputs=actual_income_input, outputs=[reverse_tax_output, reverse_insurance_output, gross_salary_output, reverse_cost_percent_output])
+    gr.Markdown("### Tax Calculation Rules")
+    gr.DataFrame(df)
+    
+interface.launch()