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Brazilian Income Tax Calculator

Ever fancied a trip to the land of jabuticaba, rain forest, and... taxes? Well, now you can experience the pure thrill of being BR anywhere in the world!

Calculate our income tax through a CLI and enjoy the most brazilianistic experience: lots and lots of taxes. Because why should brazilians have all the fun?

Running the CLI in a container

docker compose run br_income_tax

Usage example

Once the container is up and running, it will start the application in interactive mode. You can then follow the prompts to enter your income details.

This program calculates your Brazilian Income Tax based on your annual income, total deductions, and total tax paid.
Enter your annual income (e.g., 50000.00): 4332453
Enter your total deductions (e.g., 2000.00): 314435
Enter the total tax paid during the year (e.g., 5000.00): 24562
Total Tax Due (Complete Model): 1068887.14
Total Tax Due (Simplified Model): 1150749.33
Tax Difference (Complete Model): 1044325.14
Tax Difference (Simplified Model): 1126187.33
You need to pay 1044325.14 more using the Complete Model.
You need to pay 1126187.33 more using the Simplified Model.

Project structure

br_income_tax/
├── Cargo.lock
├── Cargo.toml
├── Dockerfile
├── docker-compose.yml
├── .github/
│   └── workflows/
│       └── ci.yml
└── src/
    ├── main.rs
    ├── tax_calculator.rs
    └── tax_data.rs

Mermaid flowchart

Here is a flowchart representing the flow of the application:

flowchart TD
    A[start] --> B[get user input]
    B --> C{calculate tax}
    C -->|complete model| D1[calculate taxable income<br>e.g., 60000.0 - 0.0]
    D1 --> D2[apply tax brackets and rates<br>e.g., first 27110.4 @ 0%, next 6809.39 @ 7.5%, next 11092.79 @ 15%, next 10963.56 @ 22.5%]
    D2 --> D3[sum tax due<br>e.g., 0 + 510.70 + 1663.92 + 2476.80]
    D3 --> F[print complete tax results<br>e.g., Total Tax Due: 4651.42]
    C -->|simplified model| E1[calculate simplified deduction<br>e.g., 60000.0 * 0.20 = 12000.0]
    E1 --> E2[calculate taxable income<br>e.g., 60000.0 - 12000.0]
    E2 --> E3[apply tax brackets and rates<br>e.g., first 27110.4 @ 0%, next 6809.39 @ 7.5%, next 11092.79 @ 15%, next 8488.41 @ 22.5%]
    E3 --> E4[sum tax due<br>e.g., 0 + 510.70 + 1663.92 + 1910.89]
    E4 --> F[print tax results<br>e.g., Total Tax Due: 4085.51]
    F --> G[end]
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