CUIL, CUIT & CDI for Foreigners in Argentina

Introduction: why you need these identification keys

Every foreigner who decides to settle in Argentina will eventually need to obtain at least one of the three identification keys that the Argentine system uses to connect individuals with the labor, tax, and financial spheres: CUIL, CUIT, and CDI. These keys are neither optional nor merely bureaucratic; they serve as the gateway to fundamental rights such as working legally, receiving a registered salary, invoicing for professional services, opening a bank account, purchasing real estate, accessing the social security system, and fulfilling the tax obligations imposed by Argentine law.

Confusion among these three keys is one of the most common issues faced by newly arrived foreigners. Although all three share a similar eleven-digit numerical structure, each one serves a distinct purpose, is issued by a different government agency, and requires specific conditions for its issuance. Understanding these differences from the very beginning of your immigration process allows for proper planning of your labor and tax integration, preventing unnecessary delays and errors that can have significant administrative consequences.

This guide is intended for foreigners at any stage of their residency application process in Argentina — from those who have just obtained their precarious residency to those who already hold a permanent DNI — and aims to provide a practical, up-to-date overview of each of these keys. For comprehensive advice on your immigration situation, please consult our immigration law services.

What is CUIL

The CUIL (Codigo Unico de Identificacion Laboral) is an eleven-digit number assigned by the Administracion Nacional de la Seguridad Social (ANSES) that identifies each person within the Argentine social security system. Its primary function is to link the worker with the contribution regime that funds retirement benefits, family allowances, unemployment insurance, and health coverage through the obras sociales (union-based health insurance plans).

The CUIL follows the format XX-XXXXXXXX-X: a two-digit prefix, eight central digits corresponding to the document number (DNI or, in the case of foreigners with a provisional CUIL, a number assigned by ANSES), and a final verification digit calculated through a specific algorithm.

CUIL is mandatory for anyone who works as an employee in Argentina. Without it, an employer cannot register the worker in the system, which means retirement contributions cannot be made, a salary cannot be formally received, health insurance cannot be accessed, and no employment seniority is accrued. CUIL is also required to access certain ANSES benefits, such as family allowances and unemployment insurance.

It is important to note that CUIL is not the same as CUIT. Although they share the same numerical structure and in many cases the number is identical, their purpose is different. CUIL is oriented exclusively toward the labor and social security sphere, while CUIT operates in the tax sphere. A person can have CUIL without having CUIT, but not the reverse: anyone who obtains a CUIT automatically has their CUIL enabled.

What CUIL is needed for

• Working legally as an employee
• Receiving a registered salary and pay stubs
• Having your employer make social security contributions on your behalf
• Accessing the obra social and the healthcare system
• Accruing seniority toward future retirement
• Receiving family allowances and other ANSES benefits
• Opening a payroll bank account

What is CUIT

The CUIT (Clave Unica de Identificacion Tributaria) is the eleven-digit number that identifies each taxpayer before the Agencia de Recaudacion y Control Aduanero (ARCA), formerly known as AFIP. While CUIL links a person to the social security system as a dependent worker, CUIT links them to the tax system as a party subject to tax obligations.

CUIT shares the same eleven-digit structure as CUIL (XX-XXXXXXXX-X) and, in most cases, the number is identical. However, the difference lies in its function: CUIT enables a person to operate as a self-employed taxpayer, register under the monotributo regime, issue invoices, import and export goods, incorporate companies, and comply with the tax obligations established by Argentine tax law.

For foreigners who wish to engage in self-employed activities in Argentina — whether as independent professionals, freelancers, merchants, or entrepreneurs — CUIT is an indispensable requirement. Without it, it is not possible to invoice legally, register under the monotributo, or incorporate a commercial entity. CUIT is also required to operate as an importer or exporter and to carry out certain real estate and financial transactions that require the taxpayer's tax identification.

What CUIT is needed for

• Working as a self-employed or independent professional
• Registering under the monotributo regime
• Issuing invoices for services rendered or goods sold
• Fulfilling tax obligations (Income Tax, VAT, Personal Assets Tax)
• Importing or exporting goods
• Incorporating a commercial entity (SAS, SRL, SA)
• Operating as an employer and registering workers
• Conducting foreign trade operations

What is CDI

The CDI (Clave de Identificacion) is a provisional number assigned by ARCA to individuals or legal entities abroad who do not have CUIL or CUIT but need to carry out certain operations within the Argentine financial and real estate system. Unlike CUIL and CUIT, CDI does not require immigration residency: it can be obtained solely with a valid passport, making it the tax identification tool for foreigners who have not yet started a residency application or who do not intend to reside in Argentina.

CDI was created to allow non-residents to operate within the formal Argentine system without needing a residency permit. Its main uses include opening basic bank accounts, purchasing real estate, making financial investments, and operating in the capital markets. It is also useful for those who inherit assets in Argentina or need to formalize specific transactions without establishing residency in the country.

The regulation of CDI is contained in AFIP General Resolution 3995 (currently under the purview of ARCA), which establishes the requirements, the application procedure, and the authorized operations. It is important to note that ARCA has announced the progressive elimination of CDI, with the intention of replacing it with CUIT as the sole tax identification key for all individuals, whether residents or non-residents. Until this transition process is completed, CDI remains in effect and operational.

For those planning to invest in Argentina without establishing residency, CDI currently represents the most direct path to formalize their operations. However, it should be noted that CDI does not authorize working or invoicing in Argentine territory — its scope is strictly limited to the financial and asset-related sphere.

Uses of CDI

• Opening basic bank accounts at Argentine financial institutions
• Buying and selling real estate in Argentina
• Making financial investments and operating in the capital markets
• Formalizing inheritances and asset-related transactions
• Operating in the financial system without immigration residency

Comparison table: CUIL vs CUIT vs CDI

The following table summarizes the key differences among the three identification keys. Reviewing it allows you to quickly identify which key corresponds to your particular situation.

How to obtain CUIL as a foreigner

The CUIL application process for foreigners is one of the simplest and fastest within the Argentine administrative system. It requires no prior appointment, is completely free of charge, and is resolved on the same day of submission. Below is a step-by-step guide to the procedure.

Step 1: Obtain precarious residency

The first requirement is to hold precarious residency issued by the Direccion Nacional de Migraciones (DNM). This is obtained when you begin the residency application process through the RADEX system or in person at DNM offices. Precarious residency is a digital or physical document that authorizes you to reside, work, and study in Argentina while your permanent residency application is being processed. If you have not yet started your residency process, please refer to our guide on residency in Argentina.

Step 2: Visit an ANSES office

With precarious residency in hand, you must go to any ANSES office anywhere in Argentina. No prior appointment is required for this procedure, although arriving early is recommended to avoid long waits. Service is provided on a first-come, first-served basis.

Step 3: Submit the required documents

At the ANSES office, you must present:

• Valid precarious residency (original and copy)
• Valid passport (original and copy of the data pages and the entry stamp page)

Step 4: Issuance of the provisional CUIL

ANSES issues the provisional CUIL on the spot, during the same visit. A printed certificate is provided with the assigned CUIL number. This provisional CUIL has full legal validity and authorizes the foreigner to work formally as an employee, be registered by an employer, receive retirement contributions, and access health insurance through the obra social.

Step 5: Transition to the permanent CUIL

When the foreigner obtains their permanent DNI, ANSES automatically generates the permanent CUIL linked to the new document number. It is essential to request the unification of the provisional CUIL with the permanent one at ANSES to ensure that all contributions made during the provisional period are correctly transferred to the new record. Failing to do so can create inconsistencies in your employment and retirement history.

How to obtain CUIT as a foreigner

The CUIT application process for foreigners requires having a provisional CUIL or CDI beforehand. Unlike CUIL, obtaining CUIT involves ARCA and can be completed either in person or digitally. CUIT is essential for those who wish to work independently, invoice for services, or incorporate a company in Argentina.

Step 1: Have a provisional CUIL or CDI

The prerequisite is having an assigned provisional CUIL (obtained at ANSES) or a CDI (obtained directly from ARCA). Without one of these prior keys, it is not possible to apply for CUIT.

Step 2: Apply for CUIT through ARCA

The application can be submitted in two ways:

• In person: by visiting an ARCA office with the required documentation. A prior appointment must be scheduled through ARCA's online appointment system
• Digitally: through the Digital Submissions service on the ARCA website, attaching scanned documentation

Step 3: Required documentation

• Valid precarious residency
• Valid passport
• CUIL certificate issued by ANSES
• Proof of address in Argentina (utility bill in your name or sworn declaration of domicile)

Step 4: Issuance of the provisional CUIT

ARCA issues the provisional CUIT with a maximum validity of two (2) years. This period is tied to the validity of the applicant's precarious or temporary residency. The provisional CUIT enables all tax operations: monotributo registration, invoice issuance, filing of tax returns, and compliance with fiscal obligations.

Step 5: Permanent CUIT upon obtaining DNI

Once the foreigner obtains their permanent DNI, they must request the conversion of the provisional CUIT to a permanent CUIT through ARCA. This procedure ensures the continuity of your tax history and avoids inconsistencies in tax returns filed during the provisional period.

How to obtain CDI as a foreigner

CDI is the only one of the three keys that does not require immigration residency in Argentina. It can be requested by any individual or legal entity abroad that needs to operate in the Argentine financial system, using only a valid passport as identification. This makes it the preferred option for investors, real estate buyers, and individuals who need to formalize asset-related transactions without establishing residency in the country.

Requirements

• Valid passport (no precarious, temporary, or permanent residency required)
• ARCA Form 663, duly completed
• Proof of address abroad (or in Argentina, if applicable)

Application methods

CDI can be applied for in two ways:

• In person: by visiting an ARCA office with a prior appointment and submitting Form 663 along with the supporting documentation
• Digitally: through the Digital Submissions service on the ARCA website, attaching the form and scanned documents. This method is especially useful for individuals located outside Argentina

Once the application is processed, ARCA assigns the CDI number and issues the corresponding certificate. With this number, the foreigner is authorized to open basic bank accounts, purchase real estate, operate in the financial market, and carry out other asset-related transactions without immigration residency.

For those considering investing in Argentina, CDI represents the first operational step: it allows you to formalize the investment, open the necessary bank account, and execute property deeds, all without needing to start a residency application.

Implications for your immigration status

Obtaining CUIL, CUIT, or CDI is not an isolated act; it fits within a broader process of legal integration in Argentina. Each key has direct implications for the foreigner's immigration, labor, and tax status, and choosing the right path depends on each person's personal and professional objectives.

CUIL and precarious residency: the first step toward employment

For most foreigners arriving in Argentina with the intention of working, the natural sequence is: begin the residency application, obtain precarious residency, and apply for the provisional CUIL at ANSES. This combination constitutes the first step toward formal labor integration. With the provisional CUIL and precarious residency, a foreigner can be legally employed, receive a registered salary, and begin accruing retirement contributions from day one. If you are planning your move to Argentina, keep in mind that this process can be completed immediately after obtaining precarious residency.

CUIT: for self-employed workers and entrepreneurs

If the goal is to work independently, register under the monotributo, or incorporate a SAS or other commercial entity, CUIT is essential. The provisional CUIT, combined with precarious residency, enables the foreigner to operate as a self-employed taxpayer during the period it takes to obtain their DNI. It is important to plan your tax registration in parallel with the immigration process to avoid delays in starting your economic activity.

CDI: the option for investors without residency

CDI is designed for those who need to operate in the Argentine financial system without establishing residency. It is the ideal tool for foreign investors who wish to acquire real estate, participate in the capital markets, or formalize asset-related transactions from abroad. However, CDI does not authorize working or invoicing, so its usefulness is limited to the financial and asset-related sphere.

Integrated immigration and tax planning

Obtaining these keys should not be analyzed in isolation from the foreigner's overall immigration and tax situation. Tax residency in Argentina is acquired independently from immigration residency and has direct consequences on worldwide tax obligations. An integrated approach — one that simultaneously addresses immigration, labor, and tax aspects — prevents surprises and optimizes the foreigner's situation from the outset. For a personalized analysis of your tax situation, please consult our tax advisory services.

Common mistakes

Throughout our professional practice in immigration law, we have identified a series of recurring mistakes foreigners make when applying for their identification keys in Argentina. Knowing about them in advance can help you avoid them and significantly expedite your legal integration process.

1. Confusing CUIL with CUIT

This is the most common mistake. Many foreigners assume that CUIL and CUIT are the same thing because they share the same numerical structure and, often, the same number. However, CUIL is for employees (issued by ANSES) and CUIT is for self-employed taxpayers and companies (issued by ARCA). Applying for CUIL when you need CUIT — or vice versa — creates unnecessary delays and can postpone the start of your employment or business activity.

2. Believing you need a DNI to work

One of the most widespread myths among foreigners is that without a permanent DNI you cannot work in Argentina. This is incorrect. With precarious residency and a provisional CUIL, a foreigner is fully authorized to work as an employee from day one. The DNI simplifies certain procedures and operations, but it is not an essential requirement for formal employment.

3. Not unifying the provisional CUIL with the permanent one

When a foreigner obtains their DNI, ANSES automatically generates a new permanent CUIL linked to the document number. If unification with the previous provisional CUIL is not requested, retirement contributions and employment seniority accumulated during the provisional period may become disconnected from the permanent record. This mistake can take months to correct and create problems when applying for retirement benefits.

4. Attempting to open a full bank account without DNI

Argentine banks require a permanent DNI to open accounts with full services (dollar accounts, fixed-term deposits, investments). With precarious residency and a provisional CUIL, only basic peso accounts and payroll accounts can be opened. With CDI, basic accounts for limited financial operations can be opened. Attempting to access banking products that require a DNI before obtaining one leads to frustration and wasted time.

5. Not obtaining CUIT before incorporating a company

To incorporate a SAS or any other business entity in Argentina, all partners must have a valid CUIT. Starting the incorporation process without first obtaining CUIT for all foreign partners brings the procedure to a halt and can generate additional professional fees. CUIT should be obtained before initiating any corporate formation process.

Last updated: April 2026. Legislation cited: Decree 1108/1998, Law 25.871, AFIP General Resolution 3995, AFIP General Resolution 4320.