Get your Simplificación Registral records through an API

What you can build on Simplificación Registral

• Get active employment relationships

  Build this

  Reads the relaciones laborales activas (active employment relationships) registered under your CUIT in Simplificación Registral - Empleadores.

  Takes

  Employer CUIT, CUIL (optional)

  Returns

  CUIL, surname and names, start date, contract modality, obra social, ART, pension regime

• List the day's altas, bajas and changes

  Build this

  Reads every gestión (filing) made on one day in Simplificación Registral: each alta, baja, modificación or anulación with its Registro del Trámite number.

  Takes

  Employer CUIT, date

  Returns

  Registro del Trámite number, type, CUIL, worker name, start or end date

• Check a contractor's worker

  Build this

  Looks up in Simplificación Registral whether a worker sent by a contractor has an active employment relationship with that contractor.

  Takes

  Your CUIT, contractor CUIT, worker CUIL

  Returns

  CUIL, worker name, contractor CUIT, relationship active or not

• Register a new hire (alta)

  Build this

  Files an alta in Simplificación Registral with the seven required fields and reads back the acuse de recibo (acknowledgement of receipt).

  Takes

  CUIL, domicilio de explotación and activity, start date, contract modality, agricultural mark, obra social, end date

  Returns

  Registro del Trámite number, CUIL, start date, contract modality

Automate Simplificación Registral with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• The day's altas and bajas, handed to payroll

  Build this

  Starts

  Every weekday at 18:00

  Step 1

  List the day's altas, bajas and changes in Simplificación Registral.

  Step 2

  Stop when there are none.

  Step 3

  Post each one, with its Registro del Trámite number, to your payroll system's webhook.

• New and departed workers before the Formulario 931

  Build this

  Starts

  Every month on the 1st at 8:00

  Step 1

  Get the active employment relationships for your CUIT.

  Step 2

  Keep the workers who are new or gone since the last run.

  Step 3

  Email you the list, so payroll matches it before the Formulario 931.

• Contractor workers checked before they start

  Build this

  Starts

  When your system calls the workflow's webhook with a contractor CUIT and CUILs

  Step 1

  For each CUIL, check the contractor's worker in Simplificación Registral.

  Step 2

  Keep the workers with no active relationship with that contractor.

  Step 3

  Email you those workers before they start on site.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get active employment relationships” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "auth.afip.gob.ar/get_active_relationships",
    "input": {
      "employer_cuit": "30-12345678-9"
    }
  }'

{
  "status": "completed",
  "data": {
    "employer_cuit": "30-12345678-9",
    "employer": "Acme Logística S.A.",
    "relationships": [
      {
        "cuil": "20-11111111-2",
        "name": "PEREZ, JUAN",
        "start_date": "2026-11-03",
        "contract_modality": "008 A tiempo completo indeterminado",
        "obra_social": "Obra social Northwind",
        "art": "Globex ART",
        "pension_regime": "Reparto"
      }
    ],
    "count": 1
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

Simplificación Registral’s own options

ARCA offers no API for Simplificación Registral, and its catalogue of business web services lists none for altas and bajas. Inside the service you can upload altas, bajas and changes in bulk, and the Alta Ya mobile app files new altas. Everything else is the service used by hand with Clave Fiscal.

Read on November 12, 2026: Simplificación Registral: utilidades del sistema, Simplificación Registral: procedimiento, ARCA consultas frecuentes: Simplificación Registral.

Signing in to Simplificación Registral

You sign in to ARCA with your CUIT and Clave Fiscal, then open the service Simplificación Registral - Empleadores. A company acts through its legal representative's Clave Fiscal, who can delegate the service to others. With Fous you sign in once through ARCA's own sign-in with your own account: your login is sealed with AES-256, never returned by the API, and an expired session is signed back in.

Worth knowing

Seven fields file an alta

Since RG 5508/2024 an alta needs only seven fields, such as CUIL, start date and contract modality. The rest must be completed by modificación before the worker's first salary liquidación.

Deadlines are short

An alta is due by the day before work starts, a baja within 5 calendar days of the end of the contract, and data changes within 5 administrative business days.

Anulación closes at the end of the start day

An alta can be cancelled until 24:00 of the start date, or until 12:00 the next day for shifts starting from 17:00. After work starts, the start date can only move earlier.

Some worker data cannot be edited

Name, nationality, sex and document cannot be changed in the service. The worker corrects them at ANSES, or at ARCA if they hold a CUIT.

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