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How to compare old and new tax regimes with exact rupee savings with Itr Wala

See the tax under each regime side by side and which one saves more.

  • Money
  • Intermediate
  • 30 minutes
  • From the README
  • Claude Code
  • Codex
  • Gemini CLI

Who it is forA taxpayer choosing between the old and new regimes for FY 2025-26 who wants a figure-level comparison instead of a rough guess.

The problemThe regime gap can be large, and working out deductions, surcharge, and cess under both regimes by hand is error-prone.

The outcomeA side-by-side table of gross income, deductions, slab tax, special-rate tax, cess, interest, and net payable for both regimes, with the recommended regime and the rupee saving.

What you need first

  • Python 3 installed, to run the bundled scripts and the self-test
  • git, to clone the repo and review the files before installing
  • An AI agent that the README names: Claude Code, Codex, or Gemini
  • Your Form 16 and AIS (JSON) for the income year you are filing
  • Time to review the output and to pay, submit, and e-verify on the income tax portal yourself

Steps

  1. git clone https://github.com/karanb192/itr-wala.git
  2. cd itr-wala && ./install.sh
  3. python3 skills/itr-wala/scripts/tax_engine.py skills/itr-wala/assets/example-income.json
  4. Copy the example income file, replace its figures with your own, and run the validator on it.
  5. Run the engine on your validated file to read the recommended regime and the rupee saving.

Prompt for your agent

In the itr-wala repo at <repo-path>, validate <your-income-file> for FY 2025-26, then run the tax engine on it. Expected output: old and new regime totals with the recommended regime and the rupee saving; verify the validator passes before you report the comparison.

Caveat. The bundled example figures are fictional, so your own validated income file must supply the real numbers before any regime choice is relied on.

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