Singapore NRIC Generator: Complete Guide for Developers

What is Singapore NRIC/FIN?

The NRIC (National Registration Identity Card) is Singapore's national identification number issued to Singapore citizens and permanent residents. The FIN (Foreign Identification Number) follows the same format but is issued to long-term pass holders (e.g., Employment Pass, S Pass, Work Permit holders).

Both NRIC and FIN follow a strict 9-character format with a leading letter prefix, 7 digits, and a checksum letter suffix. The system was introduced by the Immigration & Checkpoints Authority (ICA) and is used across all government services, banking, healthcare, and official transactions in Singapore.

Understanding NRIC/FIN Prefixes

The prefix letter indicates the holder's status and approximate birth year:

The ST Checksum Algorithm

Singapore uses the ST algorithm (named after the first two prefix letters) to calculate the checksum letter. Different prefixes use slightly different checksum tables, but the core algorithm remains the same.

Why Developers Need NRIC/FIN Test Data

When building applications that serve Singaporean users, you'll frequently need to handle NRIC/FIN numbers. Here are common scenarios where test data is essential:

Using Our NRIC Generator Tool

Our free NRIC generator provides a fast, secure way to create test data. Here's what makes it developer-friendly:

Code Example: Implementing NRIC Validation

Here's a JavaScript/TypeScript implementation of the ST checksum algorithm:

/**
 * Validate Singapore NRIC/FIN checksum using ST algorithm
 * @param nric - 9-character NRIC/FIN (e.g., "S1234567D")
 * @returns boolean - true if valid, false if invalid
 */
function validateNRIC(nric: string): boolean {
  // Remove any formatting and convert to uppercase
  const cleaned = nric.replace(/[^A-Z0-9]/gi, '').toUpperCase();
  
  // Must be exactly 9 characters
  if (cleaned.length !== 9) return false;
  
  // Extract components
  const prefix = cleaned[0];
  const digits = cleaned.slice(1, 8);
  const checksum = cleaned[8];
  
  // Validate prefix
  if (!['S', 'T', 'F', 'G', 'M'].includes(prefix)) return false;
  
  // Validate digits
  if (!/^\d{7}$/.test(digits)) return false;
  
  // Calculate checksum
  const weights = [2, 7, 6, 5, 4, 3, 2];
  let sum = 0;
  
  for (let i = 0; i < 7; i++) {
    sum += parseInt(digits[i]) * weights[i];
  }
  
  // Add offset for certain prefixes
  if (prefix === 'T' || prefix === 'G') {
    sum += 4;
  } else if (prefix === 'M') {
    sum += 3;
  }
  
  // Calculate remainder and look up checksum
  const remainder = sum % 11;
  
  const stChecksums = ['J', 'Z', 'I', 'H', 'G', 'F', 'E', 'D', 'C', 'B', 'A'];
  const fgChecksums = ['X', 'W', 'U', 'T', 'R', 'Q', 'P', 'N', 'M', 'L', 'K'];
  const mChecksums = ['K', 'L', 'J', 'N', 'P', 'Q', 'R', 'T', 'U', 'W', 'X'];
  
  let expectedChecksum: string;
  if (prefix === 'S' || prefix === 'T') {
    expectedChecksum = stChecksums[remainder];
  } else if (prefix === 'F' || prefix === 'G') {
    expectedChecksum = fgChecksums[remainder];
  } else { // M series
    expectedChecksum = mChecksums[remainder];
  }
  
  return checksum === expectedChecksum;
}

// Example usage:
console.log(validateNRIC("S1234567D")); // true (valid)
console.log(validateNRIC("S1234567X")); // false (invalid checksum)
console.log(validateNRIC("T0123456G")); // true (valid T series)

Legal & Ethical Usage Guidelines

While our generator creates valid-format NRIC/FIN numbers, it's crucial to use them responsibly. Here's what you need to know:

Best Practices for Test Data Generation

Frequently Asked Questions

Conclusion

The Singapore NRIC/FIN Generator is an essential tool for developers building applications for the Singaporean market. By understanding the 9-character format, ST checksum algorithm, and 5 prefix series (S, T, F, G, M), you can confidently implement NRIC validation in your projects.

Remember: always use test data responsibly. These generated NRIC/FINs are for development and testing only—never for fraud, impersonation, or bypassing identity verification.