---
title: Can I sign with an expired e.firma in Cincel?
description: Learn why you can't sign in Cincel with an expired e.firma and how the validity of the certificate guarantees the legal validity of your documents.
---

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# Can I sign with an expired e.firma in Cincel?

No, to be able to sign any document with the e.firma in Cincel, it is essential that it is valid at the time of signing. Our platform verifies the expiration date of your certificate, ensuring compliance with Mexican legal requirements.

 

---

### **Why is the validity of your e.firma crucial?**

The e.firma, issued by the Tax Administration Service (SAT), is an Advanced Electronic Signature that grants full legal and evidentiary effects to digital documents. Its legal validity depends directly on the validity of the digital certificate that composes it (.cer and .key).

When an e.firma expires, it loses its ability to:

- **Verify your digital identity:** It becomes impossible to undeniably prove who you are in the digital environment.

- **Guarantee document integrity:** The cryptographic connection that validates that the document has not been altered is broken.

- **Provide legal certainty:** A signature with an expired e.firma does not meet the standards required by the Federal Tax Code and other Mexican laws, meaning it would lack validity and evidentiary value in a court of law.

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