MX·Tax year 2025 · Filing 2026

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-source tax skills.

Mexico tax authority

Annual deadlines

1 this year

Apr30

Annual ISR Return (RESICO and Individuals)

Mexico's annual personal income tax return for 2025. RESICO (Régimen Simplificado de Confianza) and regular individuals file together.

MexicoAll residentsSelf-employed

Open-source skills for Mexico

Prepare this return with open-source skills

These skills are in the OpenAccountants repo. Clone them into Claude, Cursor, or any AI agent and they handle the computation.

mexico-iva.mdMX

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.

Preparing a Mexico return?

The OpenAccountants repo has verified, open-source tax computation skills. Clone and run them with your AI agent, then get an accountant to review.

View the repo All countries