README

PHP utility to handle Mexico SAT's (Tax Authority) RFC (Tax ID)

RFC

What is RFC? Registro Federal de Contribuyentes for the Mexican Tax Authority: SAT Servicio de Administración Tributaria and SHCP Secretaría de Hacienda y Crédito Público.

How to Use

Calculate a Person's RFC from their Name and Date of Birth data

This calculates the Homoclave , which is a __

However, do note this is only a baseline ___ and SAT can always change this __ code

specially the last 3 digits called homoclave.

The whole purpose of this is to prevent __

If two individuals were to have the exact same name born on the same date __ then they would be homonyms __ sharing the same base __

SAT would then change the homoclave for one or both of them.

More testing and validation is still required, RFCs have a lot of exceptions and edge cases that must be considered.

$dob = \DateTime::createFromFormat('Y-m-d', '1989-07-15');
$rfc = RFC::createForNaturalPerson('Jose Ramiro', 'Gutierrez', 'Hernández', $dob);

echo $rfc->getRfc(); // GUHR890715
echo $rfc->getRfcComplete(); // GUHR890715G54

Validate existing RFC strings

The utility can also be used to validate an existing RFC string and infer some metadata from it.

echo (RFC::isValid('INVALID_12313') ? 'Yes' : 'No'); // No
echo (RFC::isValid('GUHR890715G54') ? 'Yes' : 'No'); // Yes

echo (RFC::isValidWithoutHomoclave('GUHR890715') ? 'Yes' : 'No'); // Yes

Extract metadata from valid RFC strings

Validate and infer some metadata from the RFC string, such as type of legal entity.

TODO: infer date of birth.

$rfc = RFC::createFromRfcString('GUHR890715G54');

if ($rfc === null) {
    die('Invalid RFC string');
}

echo ($rfc->isGeneric() ? 'Yes' : 'No'); // No
echo ($rfc->isNaturalPerson() ? 'Yes' : 'No'); // Yes

Tests

php vendor/bin/phpunit tests/BuildTest.php
php vendor/bin/phpunit tests/ValidationTest.php

TO-DO

• Finish writing up this README
• Cleanup the RFC class, it's very messy right now. Also clean up the Tests for RFC verifications. Implement some way of testing private / protected methods ?
• Find a big list of Person Names, Date of Births and RFCs to test against.

References

https://cec.cele.unam.mx/include/howToRFC.php https://solucionfactible.com/sfic/capitulos/timbrado/rfc-clave-direfenciadora-homonimia.jsp https://solucionfactible.com/sfic/capitulos/timbrado/rfc-digito-verificador.jsp https://solucionfactible.com/sfic/capitulos/timbrado/rfc-anexos.jsp https://solucionfactible.com/sfic/resources/files/palabrasInconvenientes-rfc.pdf