This app enables automated Professional Tax calculation in ERPNext based on custom formulas defined at the state level.

⚠️ Problem Statement

• Manual Setup: ERPNext’s default payroll requires Professional Tax to be added manually in each Salary Structure. There is no built-in calculation logic tied to state-specific rules.
• Error-Prone: Hand-entering tax slabs or amounts is very error-prone. A misplaced figure or outdated slab can lead to incorrect deductions. Even small payroll errors can have significant financial consequences.
• Compliance Risk: Every state has its own PT schedule (e.g., Maharashtra’s monthly slabs), and these rates change periodically. Failing to update a slab table or formula can result in non-compliance and penalties. Keeping multiple rate tables in sync manually is difficult and risky.
• State Variability: ERPNext’s standard payroll does not easily support multiple state-level rules. Out-of-the-box, each state or region would need separate salary structures or custom scripting to account for its PT calculations, making maintenance cumbersome.

✅ Our Solution

• Introduce a custom “State” doctype with a child table to define per-state, slab-based PT formulas.
• Add a “State (PT)” link field on Employee so each employee is tied to their state’s formula table.
• On Salary Slip validation, automatically evaluate the appropriate PT formula (using safe_eval) and insert the “Professional Tax” deduction.
• Maintain all PT rules in the ERPNext UI—no code changes needed when state rates change.

🔧 Features

• State-wise PT Configuration: Define dynamic tax slabs per state using Python-style formulas in a custom “State” doctype.
• Employee-State Linking: Automatically associate each employee with their state’s PT rules via a custom State field on the Employee doctype.
• Auto Tax Deduction: On Salary Slip creation (manual or via Payroll Entry), the app calculates and injects the correct “Professional Tax” deduction line.
• Safe Formula Evaluation: Uses Frappe’s safe_eval to securely evaluate any valid slab or conditional expression.
• Fully Configurable from UI: Update or add new PT formulas through the ERPNext interface—no code changes required.
• Standalone & Lightweight: No dependency on India Compliance or other external apps—simply install and configure.

✅ Version Compatibility

⚙️ Setup Instructions

📊 Formula Example

```python 0 if grosspay <= 7500 else 175 if grosspay <= 10000 else 200```