regsim-in 0.1.1

Regulatory Simulation CLI for Indian Backend Systems

RegSim-IN 🇮🇳

Regulatory Simulation & Failure Memory CLI for Indian Backend Systems

PyPI package: regsim-in (https://pypi.org/project/regsim-in/)

Why This Project Exists (Simple Explanation)

In India, when developers build fintech apps (like payment tools, invoicing systems, or lending platforms), they often discover regulatory problems (tax rules, RBI guidelines) too late — during audits, tax notices, or when something breaks in production.

These problems are usually:

• Predictable (the same mistake happens again and again)
• Repeated by many teams
• Very expensive or stressful when found late

RegSim-IN is a small command-line tool that helps developers find these problems early — while they are still writing code or testing locally — instead of waiting for a disaster.

It turns complicated government rules into simple, computer-checkable instructions.

Who Should Use This Tool?

• Backend developers building anything related to money/payments in India
• Founders or small teams creating early versions (prototypes/MVPs) of fintech products
• Anyone who wants to avoid nasty surprises from TDS, GST, or RBI rules later

What Is RegSim-IN? (One-Sentence Version)

RegSim-IN is a free command-line tool you install with pip that checks your code/data against Indian tax and RBI rules before you deploy anything to real users.

It acts like a very strict, very fast reviewer that only cares about regulations.

The Real Problem It Solves (Plain English)

Most teams:

• Write code that looks correct
• But forget or misunderstand some tax/RBI detail
• Only find out when the tax department sends a notice, a payment fails, or an auditor flags it
• Then waste weeks fixing it — and often make the same mistake again in another part of the app or another project

RegSim-IN helps you:

• Catch these mistakes while you're still coding or testing
• See exactly which rule you broke and why
• Stop repeating the same compliance mistakes

What v1 Actually Does (Very Clear List)

Version 1 is simple and safe on purpose:

• You write rules in easy-to-read JSON files (like mini law statements)
• You give it your sample data (also JSON)
• It checks if your data follows the rules
• It tells you PASS or FAIL — and explains exactly what went wrong
• Everything is 100% predictable (same input = same result every time)
• Works great in automated tests (CI/CD pipelines) — can stop a bad merge
• Keeps a record of which rules were used and when (so you can prove "we checked on this date")

It does not:

• Talk to any government website
• File taxes for you
• Give legal advice
• Automatically know the latest law changes
• Check your entire running app (just data samples or code snippets)

Real Example Everyone Can Understand

Imagine your app pays freelancers ₹45,000 but forgets to cut TDS (tax deducted at source).

Your test data looks like this:

{
  "payment": {
    "id": "pay_1029",
    "amount": 45000,
    "vendor_type": "contractor",
    "tds_deducted": false
  }
}

The tool checks against this simple rule: "If payment > ₹30,000 to a contractor → TDS must be deducted"

Result from RegSim-IN:

{
  "status": "FAIL",
  "violations": [
    {
      "rule_id": "TDS_194C_THRESHOLD",
      "severity": "HIGH",
      "message": "TDS must be deducted under section 194C"
    }
  ]
}

→ You fix it before sending real money.

Installation (One Command)

pip install regsim-in

(You need Python installed — most developers already have it.)

Quick Usage Examples

Check one file:

regsim-in simulate --rules my-rules-folder/ --input my-test-data.json

Check your whole source code folder:

regsim-in simulate --rules rules/ --input src/

In a GitHub Actions / CI pipeline (stops bad code):

regsim-in simulate --rules rules/ --input payload.json || exit 1

User Manual

Read the full workflow guide here: USER_MANUAL.md

CLI Options (Current v1)

• regsim-in --version prints the installed version.
• regsim-in simulate --rules <path> --input <path> runs a simulation.
• --snapshot-date YYYY-MM-DD attaches a regulatory snapshot date in output metadata (for audit trails).

Important Safety Warnings (Please Read)

RegSim-IN is NOT:

• A replacement for a Chartered Accountant (CA)
• A way to file taxes or talk to the government
• Automatically up-to-date with every new RBI circular
• Giving you legal protection

It is only a developer helper to find obvious mistakes early. For real money movement, always talk to qualified professionals.

Official Disclaimer:
RegSim-IN is a developer simulation tool for engineering feedback only.
It does not guarantee legal or regulatory compliance.
Always consult qualified professionals for real-world decisions.

Future Plans (Not Promises)

Later versions might add:

• Remembering past failures so you don't repeat them
• Easier ways for people to share rules
• Checking more complicated flows (queues, retries)

None of these are in v1. v1 is intentionally small and trustworthy.

Core Beliefs Behind This Tool

• Simulation > pretending to be perfect
• Clear rules > hidden assumptions
• Predictable behavior > magic
• Learning from mistakes > repeating them

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Thank you for reading.

If you're a developer in India building anything fintech-related, try it and tell me what breaks (or doesn't). Feedback → better tool.

Gowtham
Bengaluru, 2026