Issuing invoices correctly does not mean filling fields randomly until the system allows stamping. A well-issued CFDI must work for the customer, accounting, tax returns and any later review.
The practical process is simple: correct data before issuing, review after stamping and reconciliation before filing.
Data to Request Before Invoicing
- Receiver RFC exactly as shown in tax documentation.
- Name or legal name without invented abbreviations.
- Fiscal postal code.
- Receiver tax regime.
- CFDI use that matches the operation.
- Clear and supportable product or service description.
- Payment method and form consistent with the real collection.
CSD, E.firma and Access
The Digital Seal Certificate (CSD) is used to seal invoices. The e.firma is also used for other SAT procedures. If several people invoice in your business, define who has access, who authorizes changes and how certificates and passwords are protected.
| Element | Purpose | Risk if neglected |
| Customer tax data | Allows correct stamping and deduction | Rejections, cancellations or re-invoicing |
| CSD | Digitally seals invoices | Invoicing stops or access is uncontrolled |
| Product catalog | Standardizes concepts and units | Inconsistent invoices |
| Reconciliation | Connects CFDI, bank record and return | Income or VAT misclassified |
Review Before Sending
- Confirm RFC, name, postal code and tax regime.
- Review that the concept describes the sale without ambiguity.
- Validate amount, taxes, discounts and withholdings if applicable.
- Confirm payment method: immediate payment when collected now, deferred when collected later or in installments.
- Save XML and PDF in a consistent folder.
After Issuing
For relevant invoices, verify the CFDI in the official SAT verification service. This helps confirm that the receipt was certified and that basic data matches. You do not need to do it for every minor ticket, but it is useful for sensitive operations, new customers, cancellations or invoices supporting important deductions.
Controls by Owner
| Owner | Control |
| Sales | Request complete tax data before promising invoice date |
| Invoicing | Validate fields, payment method, taxes and stamping |
| Collections | Connect payments to CFDI and request complements when needed |
| Accounting | Reconcile CFDI, bank records, cancellations and returns |
| Management | Authorize exceptions and documented criteria changes |
Closing Checklist Before Filing
- Issued invoices for the period downloaded and classified.
- Canceled invoices separated with acknowledgment and substitution when applicable.
- Received invoices reviewed against activity, payment and support.
- Payment complements identified for deferred or partial collections.
- XML backed up, not only PDF or screenshots.
- Differences between CFDI and bank records explained in writing.
How Fintax Can Help
Fintax can review your invoicing process, organize catalogs, detect recurring errors and connect CFDI with bank records and returns. The goal is for invoicing to become part of the monthly close, not an improvised task.