Mexico tax deadlines 2026.
Every individual and self-employed income tax deadline for Mexico in 2026. Plus recurring VAT / GST / sales tax filings. Each deadline links to notes on how to file, what people miss, and matching open tax rules.
Annual deadlines
1 this yearOpen tax rules for Mexico
Prepare this return with open-source skills
These skills are in the OpenAccountants repo. Add them to your AI agent and they handle the computation.
Use this skill whenever asked about Mexico e-invoicing, CFDI (Comprobante Fiscal Digital por Internet), SAT (Servicio de Administración Tributaria), PAC (Proveedor Autorizado de Certificación), timbrado (digital stamping), Anexo 20, CFDI version 4.0, XML schema for Mexican invoices, UUID/folio fiscal, RFC validation, complemento de pago, carta porte, nomina, cancelación de CFDI, or any question about generating, validating, certifying, or troubleshooting Mexican electronic invoices. Also trigger when advising on SAT compliance, PAC selection, XML structure, fiscal regime codes, product catalog codes (c_ClaveProdServ), or CFDI workflow. ALWAYS read this skill before touching any Mexico e-invoice work.
Use this skill whenever asked about Mexico cryptocurrency or virtual asset taxation. Trigger on phrases like "crypto tax Mexico", "Bitcoin Mexico", "impuesto criptomonedas", "ISR crypto", "SAT crypto", "activos virtuales Mexico", "Bitso tax", "staking Mexico", "mining income Mexico", "NFT tax Mexico", "Ley Fintech crypto", "declaración anual crypto", "CFDI crypto", or any question about the income tax, ISR, or IVA treatment of cryptocurrency, tokens, or digital assets for Mexican tax residents or Mexico-source crypto income. Covers SAT treatment of virtual assets, ISR rates, cost basis, CARF reporting, and Ley Fintech classification. ALWAYS read this skill before touching any Mexico crypto work.
Use this skill whenever asked to prepare, review, or classify transactions for a Mexico IVA (Impuesto al Valor Agregado) return or classify transactions for Mexican VAT purposes. Trigger on phrases like "prepare IVA return", "Mexican VAT", "declaracion de IVA", "CFDI classification", "SAT filing", or any request involving Mexico value-added tax. Also trigger when classifying transactions from CFDI XML files, bank statements, or invoices for Mexican IVA purposes. This skill contains the complete Mexico IVA classification rules, CFDI 4.0 requirements, rate determination (16%/0%/exempt), border zone treatment, withholding rules, deductibility rules, and filing deadlines required to produce a correct return. ALWAYS read this skill before touching any Mexico IVA-related work.
Use this skill when onboarding a Mexican persona física con actividad empresarial or RESICO freelancer. Trigger on phrases like "Mexico freelance", "SAT registration", "persona física", "actividad empresarial", "RESICO", "régimen fiscal México", "RFC", "CFDI", "ISR provisional", "declaración anual México", or any initial client conversation involving a Mexican self-employed individual. This skill collects essential information to determine the correct tax régimen, validates SAT compliance, and routes to the appropriate computation skill. ALWAYS read this skill before beginning any Mexican freelance intake.
Use this skill whenever asked about Mexico transfer pricing rules, documentation requirements, or precios de transferencia compliance. Trigger on phrases like "transfer pricing Mexico", "Mexican TP documentation", "precios de transferencia Mexico", "master file Mexico", "local file Mexico", "CbCR Mexico", "APA Mexico", "SAT transfer pricing", "maquiladora safe harbor", "Article 76 LISR", or any question about intercompany pricing for Mexican entities.
Use this skill when assembling or reviewing a Mexican persona física annual tax return (declaración anual). Trigger on phrases like "declaración anual México", "ISR anual", "return assembly Mexico", "cross-check CFDI", "IVA reconciliation", "provisional vs annual", "RESICO annual", "AEP annual return", or any task involving the compilation, verification, or filing of a Mexican individual's annual income tax return. This skill orchestrates cross-checks between ISR, IVA, IMSS, and CFDI data. ALWAYS read this skill before assembling any Mexican annual return.
Use this skill whenever asked about Mexican IMSS social security for self-employed individuals. Trigger on phrases like "IMSS", "seguro social Mexico", "regimen voluntario", "incorporacion voluntaria", "IMSS freelancer", "aseguramiento voluntario", "Modalidad 40", or any question about voluntary IMSS enrollment, contribution calculation, or benefits for self-employed persons in Mexico. Covers voluntary inscription (Modalidad 40, regimen voluntario), contribution bases, health/maternity/retirement/disability benefits, and tax deductibility. ALWAYS read this skill before touching any Mexican IMSS work.
Use this skill whenever asked about Mexican CFDI electronic invoicing. Trigger on phrases like "CFDI", "factura electronica", "PAC", "complemento de pago", "comprobante fiscal", "SAT factura", "CFDI 4.0", "timbrado", "cancelacion CFDI", or any question about issuing, receiving, or managing electronic invoices in Mexico. Covers CFDI 4.0 structure, PAC certification, complemento de pago, uso de CFDI, cancellation rules, and SAT obligations. ALWAYS read this skill before touching any Mexican CFDI work.
Prepare a Mexico review pack with open Guides
These Guides can help your AI agent draft computations, organize schedules, and prepare a review package. They do not replace a tax preparer or determine your final filing position. The OpenAccountants repo has open Tax Guides, accountant-reviewed where available — run them with your AI agent, then have an accountant review.