Module: HrLite::Calculators::Tds

Defined in:
app/services/hr_lite/calculators/tds.rb

Overview

Projection-grade TDS (not Form-16-grade — no surcharge, perquisites or HRA-exemption math; the per-slip override is the escape hatch and the slip shows the whole working so "why is my TDS X" answers itself).

projected annual gross = FY gross paid so far + this month
                       + structure gross × months remaining after this one
taxable  = projected − standard deduction − (old regime: declared deductions)
annual   = slab tax − 87A rebate (full when taxable ≤ cap) + 4% cess, §288B rounded
monthly  = max((annual − TDS already deducted) / months remaining incl. this, 0)

Defined Under Namespace

Classes: Result

Constant Summary collapse

HIGH_INCOME_WARNING_THRESHOLD = 
BigDecimal("5000000")

Class Method Summary collapse

Class Method Details

.call(regime:, structure_monthly_gross:, gross_earned_this_month:, fy_gross_paid:, fy_tds_paid:, months_remaining:, declared_annual_deductions:, rates:, override: nil) ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'app/services/hr_lite/calculators/tds.rb', line 18

def self.call(regime:, structure_monthly_gross:, gross_earned_this_month:,
              fy_gross_paid:, fy_tds_paid:, months_remaining:,
              declared_annual_deductions:, rates:, override: nil)
  table = rates[regime.to_s] || rates["new"]

  if override.present?
    monthly = Money.round_rupee(override)
    return Result.new(monthly: monthly, projected_annual_gross: nil, taxable: nil, annual_tax: nil,
                      details: { "regime" => regime.to_s, "override" => monthly.to_s("F") })
  end

  months_remaining = [ months_remaining.to_i, 1 ].max
  projected = Money.d(fy_gross_paid) + Money.d(gross_earned_this_month) +
              (Money.d(structure_monthly_gross) * (months_remaining - 1))

  deductions = table[:standard_deduction]
  deductions += Money.d(declared_annual_deductions) if regime.to_s == "old"
  taxable = [ projected - deductions, BigDecimal(0) ].max

  slab_tax = slab_tax_for(taxable, table[:slabs])
  slab_tax = BigDecimal(0) if taxable <= table[:rebate_cap] # §87A full rebate
  annual = Money.round_to_10(slab_tax * (1 + table[:cess_rate]))

  monthly = Money.round_rupee((annual - Money.d(fy_tds_paid)) / months_remaining)
  monthly = BigDecimal(0) if monthly.negative?

  Result.new(
    monthly: monthly,
    projected_annual_gross: Money.round2(projected),
    taxable: Money.round2(taxable),
    annual_tax: annual,
    details: {
      "regime" => regime.to_s,
      "projected_annual_gross" => Money.round2(projected).to_s("F"),
      "standard_deduction" => table[:standard_deduction].to_s("F"),
      "declared_deductions" => (regime.to_s == "old" ? Money.d(declared_annual_deductions).to_s("F") : "0"),
      "taxable" => Money.round2(taxable).to_s("F"),
      "annual_tax_with_cess" => annual.to_s("F"),
      "fy_tds_already_deducted" => Money.d(fy_tds_paid).to_s("F"),
      "months_remaining" => months_remaining.to_s,
      "high_income_review" => (taxable > HIGH_INCOME_WARNING_THRESHOLD).to_s
    }
  )
end