Asset Depreciation Calculator

A shell script to calculate yearly and aggregated monthly depreciation for assets defined in a YAML file.

Features

• Methods: Supports Straight-Line (default) and Declining Balance (Double Declining) methods.
• YAML Data: Loads asset details (value, lifespan, mode, salvage value) from a simple YAML config.
• Aggregate Reporting: Optional monthly schedule that groups identical depreciation periods and calculates annualized impact.
• Date Aware: Starting month can be customized, and report periods are labeled with human-readable dates (e.g., Jan 2026 - Dec 2026).
• Precision: Uses bc for high-precision floating-point arithmetic.
• Visuals: Clean, colored, and formatted terminal output.

Prerequisites

• yq: For parsing YAML files.
• bc: For floating-point calculations.

Usage

1. Define assets in assets.yaml:

   assets:
       - name: "Office Server"
         value: 8000
         lifespan: 4
         mode: "Declining Balance"
         salvage_value: 800
       - name: "Office Furniture"
         value: 1200
         lifespan: 10
         # mode defaults to Straight-Line
         salvage_value: 100

2. Run the script:

   # Basic yearly report
   ./depreciate.sh
   
   # Yearly report + Aggregated Monthly Schedule
   ./depreciate.sh -m
   
   # Aggregated Monthly Schedule starting from a specific date
   ./depreciate.sh -m 2026-03
   
   # Use a custom YAML file
   ./depreciate.sh my_assets.yaml -m

CLI Options & Parameters

• -m: Enables the "Overall Monthly Depreciation Schedule" at the end of the report.
• YYYY-MM: (Optional) Sets the starting month for the date labels. Defaults to the current month.
• file.yaml: (Optional) Path to the asset configuration file. Defaults to assets.yaml.

Installation

chmod +x depreciate.sh

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Preview