Booking Pricing & Tax Calculation (Laravel)

Name: Booking Pricing Tax Calculation
Rating: 62
Author: nextplus896

This skill covers how to design and implement a robust backend pricing system for car bookings, including rental duration logic, tax calculation, and strict backend validation.

The goal is to ensure all business logic lives in the backend, making the system secure, predictable, and easy to maintain.

Core Concepts

1. Required Fields

Field	Type	Rules
rental_days	integer	required, min: 1
allowance_km	integer	required, positive number
tax_rate	decimal	percentage (e.g. 15 = 15%)

Pricing Rules

Pricing depends only on rental_days.

Rule Engine

•
If rental_days <= 7
→ Daily price
•
If rental_days > 7 && <= 30
→ Weekly price
•
If rental_days > 30
→ Monthly price

Formula

php

if ($rental_days <= 7) {
    $subtotal = $rental_days * $price_per_day;
} elseif ($rental_days <= 30) {
    $subtotal = $rental_days * $price_per_week;
} else {
    $subtotal = $rental_days * $price_per_month;
}