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Every calculation includes an audit trail — a step-by-step record of how each value was computed. Required for legal compliance in most Latin American countries.

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Enabling the audit trail

The audit trail is included by default. To disable it (useful for high-frequency batch runs where you only need the summary): 
{
  "options": {
    "include_audit_trail": false
  }
}

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Structure

Each step in the audit trail records exactly how a value was calculated: 
{
  "audit_trail": [
    {
      "step": 1,
      "concept_id": "sueldo",
      "label": "Sueldo mensual",
      "formula": "input.daily_salary * input.period_days",
      "inputs": {
        "input.daily_salary": "800.00",
        "input.period_days": "30"
      },
      "result_unrounded": "24000.000000",
      "result_final": "24000.00"
    },
    {
      "step": 2,
      "concept_id": "salario_diario_integrado",
      "label": "Salario Diario Integrado (SDI)",
      "formula": "input.daily_salary * input.factor_integracion",
      "inputs": {
        "input.daily_salary": "800.00",
        "input.factor_integracion": "1.0493"
      },
      "result_unrounded": "839.440000",
      "result_final": "839.44"
    },
    {
      "step": 3,
      "concept_id": "isr",
      "label": "ISR (Impuesto Sobre la Renta)",
      "formula": "apply_bracket(base_gravable_isr, brackets.isr_mensual)",
      "inputs": {
        "base_gravable_isr": "24000.00"
      },
      "result_unrounded": "2897.321600",
      "result_final": "2897.32"
    }
  ]
}

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Field reference

FieldDescription
stepSequential step number in the calculation order
concept_idInternal identifier of the payroll concept
labelHuman-readable label (typically in Spanish)
formulaThe DSL formula that was evaluated
inputsSnapshot of all input values used in the formula
result_unroundedResult before rounding (full precision)
result_finalFinal value after rounding

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Use cases

  • Compliance audits — Demonstrate to tax authorities exactly how each value was derived
  • Debugging — Identify which formula or input caused an unexpected result
  • Reconciliation — Compare engine results against manual calculations step by step
  • Employee inquiries — Explain payslip line items with full transparency

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Performance considerations

For batch requests processing hundreds of employees, disabling the audit trail can significantly reduce response payload size. The calculation itself is not affected — only the response content changes. 
{
  "options": {
    "include_audit_trail": false
  }
}
When disabled, the audit_trail field in the response will be null.