Argentina CUIT Generator and Validator

Introduction to Argentina CUIT

The CUIT (Código Único de Identificación Tributaria) is Argentina's Unique Tax Identification Code, a critical identifier for all taxpayers in the Argentine tax system. This essential numeric code serves as the primary identifier for individuals and legal entities when interacting with AFIP (Federal Administration of Public Revenue) and conducting business operations throughout Argentina. Our Argentina CUIT Generator and Validator tool provides a simple, efficient solution for generating mathematically valid CUITs for testing purposes and validating existing CUIT numbers.

Whether you're a developer testing applications that process Argentine tax information, a QA specialist verifying data integrity, or a business analyst preparing test datasets, this tool streamlines the process of working with CUIT numbers without the complexity of API integrations or unnecessary features.

Understanding CUIT Structure and Format

The Argentine CUIT follows a specific format consisting of 11 digits arranged as:

1XX-XXXXXXXX-X
2

This standardized format can be broken down into three distinct components:

Type Code (First 2 digits): Identifies the type of entity or individual
Identification Number (Middle 8 digits): Unique sequence assigned to the entity
Verification Digit (Last digit): Calculated check digit that validates the CUIT's integrity

CUIT Type Codes

The first two digits of a CUIT indicate the type of taxpayer:

Entity Type	Type Code	Description
Company	30	Corporations, LLCs, and other business entities
Association	33	Non-profit associations
Foundation	30	Charitable foundations
Society	30	Partnerships and other society structures
Government	30	Government entities and public institutions
Foreign Company	30	Companies based outside Argentina
Individual (Male)	20	Male individuals
Individual (Female)	27	Female individuals
Trust	30	Trust entities

Understanding these type codes is essential for generating appropriate CUITs for different testing scenarios.

How to Use the Argentina CUIT Generator & Validator

Our tool offers two primary functions: generating valid CUITs and validating existing ones. Here's how to use each feature effectively:

Generating Valid CUITs

Navigate to the "CUIT Generator" section of the tool
Select the appropriate entity type from the available options
Click the "Generate CUIT" button
The tool will display a mathematically valid CUIT with the correct format and verification digit
Use the "Copy" button to copy the generated CUIT to your clipboard for use in testing

The generator creates random but mathematically valid CUITs that follow the official algorithm used by AFIP. These CUITs are perfect for testing systems that require valid CUIT formats, though they are not registered in official databases.

Validating Existing CUITs

Go to the "CUIT Validator" section of the tool
Enter the CUIT you wish to validate in the input field (format: XX-XXXXXXXX-X)
Click the "Validate CUIT" button
The tool will instantly verify if the CUIT is mathematically valid
Results will show either "Valid CUIT ✓" or "Invalid CUIT ✗"

The validator checks both the format and the mathematical validity of the CUIT by verifying that the check digit matches the calculated value based on the preceding digits.

The CUIT Verification Algorithm

The verification digit (the last digit) of a CUIT is calculated using a specific algorithm designed to detect common errors in data entry. Understanding this algorithm helps explain how our tool validates CUITs:

Step-by-Step Verification Process

Take the first 10 digits of the CUIT (excluding the verification digit)
Multiply each digit by a corresponding weight factor from this sequence: [5, 4, 3, 2, 7, 6, 5, 4, 3, 2]
Sum all the resulting products
Calculate the remainder when dividing the sum by 11
Subtract the remainder from 11
If the result is 11, the verification digit is 0
If the result is 10, the verification digit is 9
Otherwise, the result is the verification digit

Example Calculation

Let's calculate the verification digit for a CUIT with type code 30 and identification number 12345678:

The digits to verify are: 3 0 1 2 3 4 5 6 7 8
Multiply by weights: 3×5 + 0×4 + 1×3 + 2×2 + 3×7 + 4×6 + 5×5 + 6×4 + 7×3 + 8×2
Calculate: 15 + 0 + 3 + 4 + 21 + 24 + 25 + 24 + 21 + 16 = 153
Remainder of 153 ÷ 11 = 10
11 - 10 = 1
The verification digit is 1

Therefore, the complete valid CUIT is 30-12345678-1.

Applications and Use Cases

The Argentina CUIT Generator and Validator tool serves multiple practical purposes across different professional contexts:

Software Development and Testing

Database Testing: Generate valid CUITs to populate test databases with realistic Argentine taxpayer data
Form Validation: Test input validation for forms that require CUIT entry
API Integration Testing: Verify systems that interact with Argentine tax or financial APIs
Edge Case Testing: Test how systems handle different entity types and edge cases

Data Quality Assurance

Data Validation: Quickly verify if a dataset contains valid CUIT numbers
Data Cleaning: Identify invalid CUITs in existing datasets
Data Generation: Create synthetic datasets with valid Argentine tax identifiers
Import/Export Validation: Verify CUIT integrity when transferring data between systems

Business and Administrative Applications

Document Preparation: Ensure CUITs are correctly formatted in business documents
Test Environment Setup: Create realistic test environments for financial or tax-related applications
Training Materials: Generate example CUITs for training materials without using real taxpayer information

Educational Purposes

Learning Tax Systems: Understand how Argentine tax identification works
Algorithm Study: Examine the verification algorithm as an example of check digit systems
Compliance Training: Train staff on recognizing and validating proper CUIT formats

Code Examples for CUIT Validation and Generation

The following code examples demonstrate how to implement CUIT validation and generation in various programming languages:

JavaScript

1// CUIT Validation in JavaScript
2function validateCUIT(cuit) {
3  // Remove any non-digit characters
4  const cleanCuit = cuit.replace(/\D/g, '');
5  
6  // Check if it has exactly 11 digits
7  if (cleanCuit.length !== 11) {
8    return false;
9  }
10  
11  // Extract parts
12  const typeCode = cleanCuit.substring(0, 2);
13  const number = cleanCuit.substring(2, 10);
14  const providedVerificationDigit = parseInt(cleanCuit.substring(10, 11));
15  
16  // Calculate verification digit
17  const multipliers = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2];
18  let sum = 0;
19  
20  for (let i = 0; i < 10; i++) {
21    sum += parseInt(cleanCuit[i]) * multipliers[i];
22  }
23  
24  const remainder = sum % 11;
25  let calculatedVerificationDigit;
26  
27  if (remainder === 0) {
28    calculatedVerificationDigit = 0;
29  } else if (remainder === 1) {
30    calculatedVerificationDigit = 9;
31  } else {
32    calculatedVerificationDigit = 11 - remainder;
33  }
34  
35  return calculatedVerificationDigit === providedVerificationDigit;
36}
37
38// Example usage
39console.log(validateCUIT('30-12345678-1')); // true or false
40

Python

1# CUIT Generation in Python
2import random
3
4def generate_cuit(entity_type='COMPANY'):
5    # Define entity type codes
6    entity_types = {
7        'COMPANY': 30,
8        'ASSOCIATION': 33,
9        'FOUNDATION': 30,
10        'SOCIETY': 30,
11        'GOVERNMENT': 30,
12        'FOREIGN_COMPANY': 30,
13        'INDIVIDUAL_MALE': 20,
14        'INDIVIDUAL_FEMALE': 27,
15        'TRUST': 30
16    }
17    
18    # Get type code for the selected entity type
19    type_code = entity_types.get(entity_type, 30)
20    
21    # Generate random 8-digit number
22    number = ''.join([str(random.randint(0, 9)) for _ in range(8)])
23    
24    # Calculate verification digit
25    multipliers = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2]
26    digits = f"{type_code}{number}"
27    
28    sum_products = sum(int(digits[i]) * multipliers[i] for i in range(10))
29    remainder = sum_products % 11
30    
31    if remainder == 0:
32        verification_digit = 0
33    elif remainder == 1:
34        verification_digit = 9
35    else:
36        verification_digit = 11 - remainder
37    
38    # Format and return the CUIT
39    return f"{type_code}-{number}-{verification_digit}"
40
41# Example usage
42print(generate_cuit('INDIVIDUAL_MALE'))
43

PHP

1<?php
2// CUIT Validation in PHP
3function validateCUIT($cuit) {
4    // Remove any non-digit characters
5    $cleanCuit = preg_replace('/\D/', '', $cuit);
6    
7    // Check if it has exactly 11 digits
8    if (strlen($cleanCuit) !== 11) {
9        return false;
10    }
11    
12    // Extract parts
13    $typeCode = substr($cleanCuit, 0, 2);
14    $number = substr($cleanCuit, 2, 8);
15    $providedVerificationDigit = intval(substr($cleanCuit, 10, 1));
16    
17    // Calculate verification digit
18    $multipliers = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2];
19    $sum = 0;
20    
21    for ($i = 0; $i < 10; $i++) {
22        $sum += intval($cleanCuit[$i]) * $multipliers[$i];
23    }
24    
25    $remainder = $sum % 11;
26    
27    if ($remainder === 0) {
28        $calculatedVerificationDigit = 0;
29    } elseif ($remainder === 1) {
30        $calculatedVerificationDigit = 9;
31    } else {
32        $calculatedVerificationDigit = 11 - $remainder;
33    }
34    
35    return $calculatedVerificationDigit === $providedVerificationDigit;
36}
37
38// Example usage
39echo validateCUIT('30-12345678-1') ? 'Valid' : 'Invalid';
40?>
41

Java

1// CUIT Generation and Validation in Java
2import java.util.Random;
3
4public class CUITUtils {
5    
6    // Entity type codes
7    private static final int COMPANY_CODE = 30;
8    private static final int ASSOCIATION_CODE = 33;
9    private static final int INDIVIDUAL_MALE_CODE = 20;
10    private static final int INDIVIDUAL_FEMALE_CODE = 27;
11    
12    // Generate a valid CUIT
13    public static String generateCUIT(String entityType) {
14        int typeCode;
15        
16        // Determine type code based on entity type
17        switch (entityType.toUpperCase()) {
18            case "INDIVIDUAL_MALE":
19                typeCode = INDIVIDUAL_MALE_CODE;
20                break;
21            case "INDIVIDUAL_FEMALE":
22                typeCode = INDIVIDUAL_FEMALE_CODE;
23                break;
24            case "ASSOCIATION":
25                typeCode = ASSOCIATION_CODE;
26                break;
27            case "COMPANY":
28            default:
29                typeCode = COMPANY_CODE;
30                break;
31        }
32        
33        // Generate random 8-digit number
34        Random random = new Random();
35        StringBuilder number = new StringBuilder();
36        for (int i = 0; i < 8; i++) {
37            number.append(random.nextInt(10));
38        }
39        
40        // Calculate verification digit
41        String digits = String.format("%02d%s", typeCode, number.toString());
42        int verificationDigit = calculateVerificationDigit(digits);
43        
44        // Format and return the CUIT
45        return String.format("%02d-%s-%d", typeCode, number.toString(), verificationDigit);
46    }
47    
48    // Calculate verification digit
49    private static int calculateVerificationDigit(String digits) {
50        int[] multipliers = {5, 4, 3, 2, 7, 6, 5, 4, 3, 2};
51        int sum = 0;
52        
53        for (int i = 0; i < 10; i++) {
54            sum += Character.getNumericValue(digits.charAt(i)) * multipliers[i];
55        }
56        
57        int remainder = sum % 11;
58        
59        if (remainder == 0) {
60            return 0;
61        } else if (remainder == 1) {
62            return 9;
63        } else {
64            return 11 - remainder;
65        }
66    }
67    
68    // Validate a CUIT
69    public static boolean validateCUIT(String cuit) {
70        // Remove any non-digit characters
71        String cleanCuit = cuit.replaceAll("\\D", "");
72        
73        // Check if it has exactly 11 digits
74        if (cleanCuit.length() != 11) {
75            return false;
76        }
77        
78        // Extract verification digit
79        int providedVerificationDigit = Character.getNumericValue(cleanCuit.charAt(10));
80        
81        // Calculate expected verification digit
82        int calculatedVerificationDigit = calculateVerificationDigit(cleanCuit.substring(0, 10));
83        
84        // Compare verification digits
85        return calculatedVerificationDigit == providedVerificationDigit;
86    }
87    
88    public static void main(String[] args) {
89        // Example usage
90        String generatedCUIT = generateCUIT("COMPANY");
91        System.out.println("Generated CUIT: " + generatedCUIT);
92        System.out.println("Is valid: " + validateCUIT(generatedCUIT));
93    }
94}
95

C#

1using System;
2using System.Text.RegularExpressions;
3
4public class CUITValidator
5{
6    // Validate a CUIT
7    public static bool ValidateCUIT(string cuit)
8    {
9        // Remove any non-digit characters
10        string cleanCuit = Regex.Replace(cuit, @"\D", "");
11        
12        // Check if it has exactly 11 digits
13        if (cleanCuit.Length != 11)
14        {
15            return false;
16        }
17        
18        // Extract verification digit
19        int providedVerificationDigit = int.Parse(cleanCuit.Substring(10, 1));
20        
21        // Calculate expected verification digit
22        int[] multipliers = { 5, 4, 3, 2, 7, 6, 5, 4, 3, 2 };
23        int sum = 0;
24        
25        for (int i = 0; i < 10; i++)
26        {
27            sum += int.Parse(cleanCuit.Substring(i, 1)) * multipliers[i];
28        }
29        
30        int remainder = sum % 11;
31        int calculatedVerificationDigit;
32        
33        if (remainder == 0)
34        {
35            calculatedVerificationDigit = 0;
36        }
37        else if (remainder == 1)
38        {
39            calculatedVerificationDigit = 9;
40        }
41        else
42        {
43            calculatedVerificationDigit = 11 - remainder;
44        }
45        
46        return calculatedVerificationDigit == providedVerificationDigit;
47    }
48    
49    // Format a CUIT with proper separators
50    public static string FormatCUIT(string cuit)
51    {
52        string cleanCuit = Regex.Replace(cuit, @"\D", "");
53        
54        if (cleanCuit.Length != 11)
55        {
56            return cuit; // Return original if not 11 digits
57        }
58        
59        return $"{cleanCuit.Substring(0, 2)}-{cleanCuit.Substring(2, 8)}-{cleanCuit.Substring(10, 1)}";
60    }
61}
62

History of CUIT in Argentina

The CUIT system was established in Argentina in the early 1990s as part of a broader tax reform initiative aimed at modernizing the country's fiscal infrastructure and reducing tax evasion. The Federal Administration of Public Revenue (AFIP), Argentina's tax authority, implemented the CUIT as a standardized identification system for all taxpayers.

Before the introduction of the CUIT, Argentina used various inconsistent identification systems for different types of taxpayers, making tax administration inefficient and creating opportunities for non-compliance. The CUIT unified these systems into a single, verifiable identifier that could be used across all tax-related activities.

Key milestones in the evolution of the CUIT system include:

Early 1990s: Initial implementation of the CUIT system for businesses and self-employed individuals
Mid-1990s: Extension of the system to cover all taxpayers, including employees
Late 1990s: Integration of the CUIT with electronic tax filing systems
2000s: Implementation of online verification systems for CUIT validation
2010s: Further integration with digital tax services and electronic invoicing requirements

The CUIT has become an essential element of Argentina's economic and financial systems, serving not only for tax purposes but also for banking, employment, social security, and business transactions.

Frequently Asked Questions

What is a CUIT number?

A CUIT (Código Único de Identificación Tributaria) is Argentina's Unique Tax Identification Code assigned to individuals and legal entities for tax purposes. It consists of 11 digits in the format XX-XXXXXXXX-X, where the first two digits indicate the type of entity, the middle eight digits are an identification number, and the last digit is a verification digit.

How can I tell if a CUIT is valid?

A valid CUIT must:

Follow the XX-XXXXXXXX-X format
Have a verification digit that matches the calculated value based on the preceding digits
Start with a valid entity type code (e.g., 20, 27, 30, 33)

Our CUIT validator tool can instantly check if a CUIT meets these criteria.

What's the difference between CUIT and CUIL?

While similar in format, CUIT and CUIL serve different purposes:

CUIT (Código Único de Identificación Tributaria) is used for taxpayers who conduct economic activities
CUIL (Código Único de Identificación Laboral) is assigned to employees who don't have independent economic activities

Both follow the same format and verification algorithm, but they're used in different contexts.

Can I use the generated CUITs for official purposes?

No. The CUITs generated by this tool are mathematically valid but are not registered in AFIP's official database. They should only be used for testing, development, or educational purposes. Using fictional CUITs for official documents or transactions may constitute fraud.

Why do some entity types share the same type code?

The AFIP has assigned the same type code (30) to several entity types including companies, foundations, and government entities. This is part of the official classification system and doesn't affect the validity of the CUIT. The specific entity type is determined by additional registration information in AFIP's systems.

How often do CUITs change?

CUITs are permanent identifiers that generally don't change throughout the life of an individual or entity. However, in some specific cases like changes in legal status or gender reassignment, a new CUIT might be assigned.

Can a CUIT be validated against official AFIP records?

Yes, but not through our tool. AFIP provides an official service called "Constancia de Inscripción" on their website where you can verify if a CUIT is officially registered and active. Our tool only validates the mathematical correctness of a CUIT.

What are common errors when entering CUITs?

Common errors include:

Transposition of digits (e.g., 12 instead of 21)
Missing or extra digits
Incorrect format (missing hyphens)
Using incorrect entity type codes
Calculation errors in the verification digit

Our validator helps identify these issues by checking both format and mathematical validity.

How do I generate CUITs for specific entity types?

Our tool allows you to select from various entity types before generating a CUIT. Simply choose the appropriate entity type from the dropdown menu and click "Generate CUIT." The tool will automatically use the correct type code for your selection.

Is there a limit to how many CUITs I can generate or validate?

No, our tool doesn't impose any limits on the number of CUITs you can generate or validate. It's designed for convenience in testing and educational scenarios where you might need multiple valid CUITs.

References

Administración Federal de Ingresos Públicos (AFIP). "Identificación Tributaria." https://www.afip.gob.ar/
Ministerio de Economía de la República Argentina. "Sistema Tributario Argentino." https://www.argentina.gob.ar/economia
Ley 11.683 de Procedimiento Tributario. Boletín Oficial de la República Argentina.
Resolución General AFIP 1817/2005. "Procedimientos de inscripción y registración."
Chicote, J. (2018). "Tax Identification Systems in Latin America: A Comparative Analysis." Journal of Tax Administration, 4(1), 88-106.
Gómez Sabaini, J.C., & Morán, D. (2016). "Tax Policy in Latin America: Assessment and Guidelines for Reform." United Nations Economic Commission for Latin America and the Caribbean (ECLAC).

Conclusion

The Argentina CUIT Generator and Validator tool provides a straightforward, efficient solution for working with Argentine tax identification codes in testing and development environments. By understanding the structure, format, and verification algorithm of CUITs, users can ensure data integrity and compliance with Argentine tax identification standards.

Whether you're developing software that interfaces with Argentine financial systems, testing data validation routines, or simply learning about international tax identification systems, our tool offers the functionality you need without unnecessary complexity.

Try generating a CUIT now or validate an existing one to experience the simplicity and effectiveness of our tool firsthand.

เครื่องมือสร้างและตรวจสอบ CUIT ของอาร์เจนตินาสำหรับการทดสอบ

เครื่องมือสร้างและตรวจสอบ CUIT ของอาร์เจนตินา

เครื่องมือสร้าง CUIT

เครื่องมือตรวจสอบ CUIT

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