Quick Response
A serious tax diagnosis gathers obligations, filings, payments, CFDI, banks, opinion, and Tax Mailbox; classifies findings by impact and urgency; and ends with a plan including responsible parties, evidence, and deadlines.
A tax diagnosis turns data from the SAT, CFDI, banks, and filings into a prioritized plan with evidence and responsible parties.
Original Fintax publication: what to expect from a clear and actionable tax diagnosis.
Before Acting
A diagnosis with incomplete information must state its limits. Do not turn a lack of evidence into a favorable conclusion.
What It Means in Practice
A useful tax diagnosis is not a downloaded opinion or a list of obligations. It must connect identity, tax regime, filings, payments, CFDI, banks, and communications to explain what is correct, what is missing, and what should be resolved first.
Speed is only valuable if the scope is defined. A preliminary report can be prepared quickly with available sources, but complex findings require documents, reconciliations, and validation before becoming a recommendation.
Decision Map
Review Checklist
- Certificate of tax situation and active obligations.
- Opinion of Compliance and Tax Mailbox.
- Filings, payments, and acknowledgments for relevant periods.
- Issued, received, canceled CFDI and bank statements.
- List of findings with impact, priority, and responsible party.
Step by Step
- Define scope, date, and taxpayer.
- Gather necessary documents and access.
- Cross-check obligations, filings, CFDI, and banks.
- Prioritize findings by impact and deadline.
- Deliver plan, responsible parties, and missing evidence.
Frequently Asked Questions
Does a diagnosis replace an audit?
No. It is a review with a defined scope to detect signals and prioritize actions; an audit may require more extensive testing.
Can it be done in 24 hours?
A first reading can be generated if information is available. Do not promise definitive conclusions about operations that still lack support.
What should the report include?
Scope, cutoff date, sources, findings, evidence, estimated impact, priority, responsible party, and next action.
Official sources and related readings
Consult official sources: SAT Opinion of Compliance, accounting elements, current CFF.
Continue with these Fintax guides: regularization of Negative Opinion of Compliance, monthly business controls.
What to Do Now
Save the diagnosis, consulted source, date, responsible party, and evidence for each decision. If there is a material difference, overdue obligation, or formal SAT act, review the full file before submitting a complementary filing, paying, or responding.
