# Indian Tax Calc

India tax calc: income, STCG/LTCG, advance tax, TDS (FY 2025-26)

- Repository: https://github.com/taracodlabs/aiden (868 stars)
- Category: Engineering
- License: Apache-2.0
- Last updated: 2026-10-19
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add taracodlabs/aiden --skill indian-tax-calc -g -a claude-code -y`
Codex: `npx skills add taracodlabs/aiden --skill indian-tax-calc -g -a codex -y`
Cursor: `npx skills add taracodlabs/aiden --skill indian-tax-calc -g -a cursor -y`
Gemini CLI: `npx skills add taracodlabs/aiden --skill indian-tax-calc -g -a gemini-cli -y`

## Description

India tax calc: income, STCG/LTCG, advance tax, TDS (FY 2025-26)

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Indian Tax Calculator

Calculate Indian income tax liability, STCG/LTCG on equity and F&O trades, advance tax installments, and TDS for FY 2025-26, under both old and new tax regimes.

## When to Use

- User asks "how much tax do I owe on my salary / income?"
- User wants to calculate STCG or LTCG on stock or mutual fund gains
- User asks about tax on F&O profits
- User wants to compare old regime vs new regime tax
- User needs advance tax calculation or TDS estimation

## How to Use

### New regime tax slab (FY 2025-26)
```powershell
function Get-TaxNewRegime {
  param([double]$Income)
  # FY 2025-26 new regime slabs (post Budget 2025)
  $slabs = @(
    @{UpTo=400000;  Rate=0},
    @{UpTo=800000;  Rate=0.05},
    @{UpTo=1200000; Rate=0.10},
    @{UpTo=1600000; Rate=0.15},
    @{UpTo=2000000; Rate=0.20},
    @{UpTo=2400000; Rate=0.25},
    @{UpTo=[double]::MaxValue; Rate=0.30}
  )
  $tax = 0; $prev = 0
  foreach ($slab in $slabs) {
    if ($Income -le $prev) { break }
    $taxable = [math]::Min($Income, $slab.UpTo) - $prev
    $tax += $taxable * $slab.Rate
    $prev = $slab.UpTo
  }
  # Rebate u/s 87A: nil tax if income <= 12,00,000
  if ($Income -le 1200000) { $tax = 0 }
  $cess = $tax * 0.04
  return [PSCustomObject]@{ Tax=$tax; Cess=$cess; Total=[math]::Round($tax+$cess,2) }
}

Get-TaxNewRegime -Income 1500000
```

The rest: https://github.com/taracodlabs/aiden/blob/HEAD/skills/indian-tax-calc/SKILL.md