How to consult SAT in Mexico: complete and easy guide to resolve your tax situation
If you live in Mexico or have ever had to deal with the tax system there, you've probably heard of the RFC — Federal Taxpayer Registry. This number is essential for any type of tax transaction, such as opening an account, issuing an invoice, filing a tax return or even getting a formal job.
“Finding my RFC was a game changer when I started working for myself. Before, I didn’t even know I needed one!”
In addition to officially identifying you before the SAT (Mexico's Tax Administration Service), RFC is also necessary for check balance in favor of sat, that is, see if you have money to receive from the government!
Even if you think you don't need it, it's important consult RFC and check that everything is OK — especially if you've already used the CURP to register for some government service.
You will need it to:
The truth is that the RFC accompanies you in practically everything that involves the SAT. Therefore, consult RFC with CURP regularly to avoid surprises.
“I didn’t know, but I had a balance to receive! I only found out after I decided to pay it consult RFC with CURP out of curiosity.”
This is the most common. The homoclave is a three-character extension that helps differentiate people with similar names. This is your full, official number, used in any procedure.
Used by companies when the client does not have an RFC or in international operations. It is not personal, so it is not useful for declaring taxes or check balance in favor of sat.
If you have ever worked with an IMSS registration, had a formal employment contract or opened a business, you probably already have a number. To be sure:
This is the most practical way. You only need your CURP (Single Population Registry).
Tip: you can calculate CURP with RFC and vice versa, if you have at least one of the two.
Another way is to use your full name and date of birth. It works well, but it can give an error if there is an inconsistency in the data.
If you already have access to the SAT portal, this is the most reliable way. In addition, it allows check balance in favor of sat and generate official documents.
📌 Important: Keep a copy as it will be useful for check balance in favor of sat in the future.
If you have e.firma (digital signature from SAT), the process is even simpler:
You must contact the SAT and present official documents. Often, this can be done online, but it may require in-person assistance.
In theory, no. But if the person authorizes you and provides their data, you can do it. RFC query with CURP. However, it is essential to respect privacy and not use this information without permission.
Yes! You can:
But the fastest way is still online, with the CURP or e.firm.
Checking your RFC may seem bureaucratic at first, but once you understand the process, it becomes part of your adult routine in Mexico. In addition to avoiding problems with the SAT, you can also discover pleasant surprises such as balance receivable!
“I only understood the importance of RFC after trying to do my first job as a freelancer. Nowadays, I make a point of consult RFC with CURP every six months, just to be safe.”
