indian-tax-calc

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
• User is filling a return on the e-filing portal and wants Claude to verify screens live

How to Use

New regime tax slab (FY 2025-26)

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

Old regime tax slab (FY 2025-26)

function Get-TaxOldRegime {
  param([double]$Income, [double]$Deductions = 0)
  $taxableIncome = $Income - $Deductions
  $slabs = @(
    @{UpTo=250000;  Rate=0},
    @{UpTo=500000;  Rate=0.05},
    @{UpTo=1000000; Rate=0.20},
    @{UpTo=[double]::MaxValue; Rate=0.30}
  )
  $tax = 0; $prev = 0
  foreach ($slab in $slabs) {
    if ($taxableIncome -le $prev) { break }
    $taxable = [math]::Min($taxableIncome, $slab.UpTo) - $prev
    $tax += $taxable * $slab.Rate
    $prev = $slab.UpTo
  }
  if ($taxableIncome -le 500000) { $tax = [math]::Min($tax, 12500) }
  $cess = $tax * 0.04
  return [PSCustomObject]@{ TaxableIncome=$taxableIncome; Tax=$tax; Cess=$cess; Total=[math]::Round($tax+$cess,2) }
}

Get-TaxOldRegime -Income 1500000 -Deductions 150000  # 80C deduction