Key fact: The IVA return is definitive — it is not corrected in the annual return like ISR. Every month you file incorrectly (or don\'t file at all), that error stays on record and can trigger SAT notices at any point in the following 5 years. The deadline is the 17th of each month for the previous month\'s income.
What IVA is and why it is paid monthly (not annually)
The Impuesto al Valor Agregado (IVA — Mexico\'s VAT) is an indirect tax: you pay it when you buy, and you charge it to your clients when you sell. The principle is simple: the difference between the IVA you charged (trasladado) and the IVA you paid on your purchases (acreditable) is what you remit to SAT each month.
Unlike ISR, whose monthly returns are provisional and adjusted at year-end, the IVA return is definitive: no annual adjustment. What you file each month is fixed. Errors in monthly IVA returns accumulate inconsistencies that SAT can detect in reviews of prior years.
Three IVA rates in Mexico in 2026
| Rate | When it applies | Legal basis |
|---|---|---|
| 16% | General rule: sales and services in national territory outside ZLFN | Art. 1 IVA Law |
| 8% | Northern Border Free Zone (ZLFN): border municipalities adjacent to USA | Art. 1-C IVA Law + 2019 Decree |
| 0% | Service exports abroad, unprocessed food, medicines, water | Arts. 2-A and 29 IVA Law |
| Exempt | Medical services, education, land passenger transport, books | Art. 15 IVA Law |
The distinction between 0% rate and exempt matters for calculation: if you sell at 0% (for example, services to foreign clients), the IVA you pay on your expenses is still creditable. If your activity is exempt, the IVA on your expenses is NOT creditable — you must absorb it as a cost.
The IVA payment formula: three components you need to understand
IVA to pay = IVA charged to clients − IVA paid on expenses − IVA withheld by clients
- IVA trasladado (charged): The IVA you collected from clients on your invoices. If you invoiced $50,000 + 16% IVA, the trasladado is $8,000.
- IVA acreditable (creditable): The IVA you paid on purchases and expenses — only on invoices actually paid in the month (Art. 5 Sec. III IVA Law). Having the CFDI is not enough; the payment must have been made.
- IVA retenido recibido (received withholding): The IVA that your corporate clients withheld when paying you. When an SA de CV pays you professional fees, they withhold 10.67% of the IVA you invoiced and remit it directly to SAT. You deduct this from what you owe.
Complete practical example: independent consultant with Mexican and foreign clients
| Item | Base | IVA |
|---|---|---|
| Fees collected from Mexican company (SA de CV) | $40,000 | $6,400 (16%) — but company withheld $682.72 (10.67%) |
| Services to US client | $20,000 | $0 (0% export) |
| Adobe CC paid in July | $350 | $56 creditable (foreign invoice, rule 2.7.1.14) |
| Office rent paid in July (CFDI) | $8,000 | $1,280 creditable |
| Laptop purchased in July (CFDI) | $15,000 | $2,400 creditable |
- IVA trasladado: $6,400
- IVA acreditable: $56 + $1,280 + $2,400 = $3,736
- IVA withheld received: $682.72
- IVA to pay = $6,400 − $3,736 − $682.72 = $1,981.28 MXN
Without capturing the received withholding, they would have paid $2,664 instead of $1,981.28 — $682.72 overpaid.
Step by step: how to file the IVA return on the SAT portal
- Log in: sat.gob.mx → "Iniciar sesión" → RFC + password, or e.firma (.cer + .key + password).
- Go to Declarations: Main menu → "Declaraciones" → "Presenta tus pagos provisionales o definitivos" → "Personas físicas" or "Personas morales".
- Select the period: Year: 2026 → Period: the month you are filing → Type: Normal (or Complementaria to correct a prior return).
- Review the pre-filled data: The system shows IVA charged from your issued CFDIs and creditable IVA from received CFDIs. Critical point: SAT does not know which received invoices you have already paid. You must remove those you have not yet paid.
- Capture or adjust: Modify amounts for uninvoiced income, foreign supplier expenses (without CFDI), or received withholdings not pre-loaded.
- Verify the result: Amount due → generate payment line. Balance in favor → decide whether to carry forward or request refund.
- Pay: With the generated payment line, go to your bank portal → "Pago de impuestos federales" or "SAT" section → enter the payment line and amount. Deadline: 17th of the following month.
- Download the acknowledgment: Save the filing receipt and bank payment proof.
Common warning: SAT pre-fills the IVA return with all CFDIs dated within the period — including received invoices you have not yet paid. Filing without reviewing may mean you are crediting IVA on unpaid expenses, which violates Art. 5 Sec. III IVA Law and can generate differences in reviews.
Most common errors and how to avoid them
| Error | Consequence | How to avoid |
|---|---|---|
| Crediting IVA on unpaid invoices | Detectable differences in review | Cross-reference CFDIs with bank statement from same month |
| Not capturing received withholdings | Overpayment to SAT | Review CFDIs from corporate clients |
| Not reporting 0%-rate income | Inconsistency with bank deposits | Always invoice, even for foreign clients |
| Filing without paying (or paying late) | 1.47%/month surcharges + formal penalty | Schedule bank payment on the same day as filing |
| DIOT does not match IVA return | Alert in SAT system | File DIOT before the 17th with the same figures |
| Applying 16% in the ZLFN border zone | Excess IVA charged; client issues | Verify if fiscal address is in a ZLFN municipality |
Nexoconsult handles monthly accounting and IVA returns for individuals and companies in Mexico. View plans and pricing here.
Frequently asked questions
Is the IVA rate different in the Northern Border Free Zone (ZLFN)?
Yes. Since January 2019, the Northern Border Free Zone (Zona Libre de la Frontera Norte, ZLFN) applies an 8% IVA rate instead of the general 16%. The ZLFN covers specific municipalities in Baja California, Sonora, Chihuahua, Coahuila, Nuevo León and Tamaulipas that border the United States. If you operate in one of these municipalities and your sales take place there, you apply 8%. If you also have operations outside the ZLFN, you apply 16% on those. In your monthly SAT return, you can report both rates in the same period.
Can I credit IVA from an invoice I received but haven't paid yet?
No. Article 5, Section III of the IVA Law establishes that IVA is only creditable in the month in which the price of the goods or services is actually paid. Having the CFDI in your fiscal inbox is not enough — payment must have been made. If you receive an invoice in June but pay it in July, the IVA on that invoice is creditable in the July return, not June's. This creates an important practical difference: if your accounting accumulates received CFDIs without verifying whether they are paid, the creditable IVA you capture may be inflated, generating inconsistencies with SAT. The correct validation is to cross each received CFDI with the payment proof (transfer, card charge, cashed check) from the same month.
What do I do if my monthly IVA return shows a balance in my favor?
You have two legal options under Article 6 of the IVA Law: (1) Credit the favorable balance against the IVA due the following month. This is the simplest option — you capture it as a carryforward balance in the next month's return and it reduces what you would owe. No additional procedure needed. (2) Request a refund from SAT. This applies especially when the favorable balance is recurring or significant (for example, agencies with many foreign clients at 0% IVA, or companies with large asset investments). Refunds can take 40–70 business days; SAT may request additional documentation (DIOT, supporting CFDIs, contracts). To request the refund: sat.gob.mx → Trámites → Devoluciones y compensaciones → Solicitud de devolución. You need a valid e.firma and a CLABE bank account registered in your name with SAT.
What penalties and surcharges apply if I don't file or pay IVA by the 17th?
SAT automatically applies: (1) Monthly surcharges: 1.47% per month on the unpaid amount (Art. 21 CFF, 2026 rate), calculated from day 18 until actual payment. (2) Late filing penalty: between $1,490 and $35,330 MXN (Art. 82 Sec. I CFF, amounts updated in RMF 2026), depending on whether you file before or after an SAT notice. Filing after an SAT notification (invitation letter or formal requirement) results in a higher penalty than filing spontaneously. (3) Negative compliance opinion: if you accumulate unfiled returns, your fiscal compliance certificate (32-D) turns negative, blocking government contracts and potentially affecting commercial relationships with clients who require it. The good news: Article 73 CFF establishes that if you file and pay spontaneously (before any SAT notice), formal penalties are waived — you only pay the surcharges.
Do RESICO taxpayers also file a monthly IVA return?
Yes. RESICO (Régimen Simplificado de Confianza) simplifies ISR — the rate runs from 1% to 2.5% on collected income and the monthly return is definitive. But IVA is a completely separate tax and its rules do not change based on your ISR regime. A RESICO taxpayer providing taxable services (16%) is still required to: charge 16% IVA on invoices, file a monthly IVA return by the 17th of each month, and remit the difference between charged IVA and creditable IVA. The only exception is RESICO taxpayers whose activity is IVA-exempt (such as certain educational or medical services), who have no IVA obligation. If you are in RESICO and unsure whether your activity generates IVA, the catalog of exempt activities is in Article 15 of the IVA Law.