Mexico: Tax Disputes – Country Comparative Guides

Is it necessary for a taxpayer to register with the tax authority? Are separate registrations required for corporate income tax and value added tax/sales tax?

Yes, it is necessary. The taxpayer is provided with a Tax ID as a result of the registration.

When registering taxpayers must inform which taxes they are subject to but is not a separate registration.
In general terms, when a taxpayer files a tax return, does the tax authority check it and issue a tax assessment, or is there a self-assessment system where the taxpayer’s own assessment stands unless the tax authority intervenes?

It’s a self-assessment system where the taxpayer’s own assessment stands. Tax authorities can only challenge the assessment as a result of an audit.
Can a taxpayer amend their return after it has been filed? If so, are there any time limits for doing so?

Yes he can up to 3 times. There are no time limits to do so; however, filing amended returns cannot be done if the taxpayer is subject to a tax audit unless the modifications in the return are favourable to the tax authorities.
Please summarise the main methods by which a tax authority may challenge the amount of tax a taxpayer has paid by way of an initial assessment/self-assessment. Does the tax authority need any justification to commence such a challenge?

In order to challenge the amount of taxes paid by taxpayers, mainly the authorities start audits on specific taxes, years and discrepancies detected by their system. There are some modalities of audits but the authorities generally conduct them in the domicile of the taxpayer or by requiring explanations and documentation to be exhibited directly at their offices. The authorities do not need a justification to start an audit since they have the ability to start as many as the want within the statute of limitations (5 years).
What are the time limits for a tax authority to commence a challenge to the taxpayer’s assessment/self-assessment (disregarding any override of these limits to comply with obligations to provide relief from double taxation under a tax treaty)? Does a tax authority have any options to challenge a self-assessment after expiry of the relevant time limit?

The statute of limitations is 5 years counted from the day the tax return is filed.

Does a tax authority have any options to challenge a self-assessment after expiry of the relevant time limit? No, they do not.
How is tax fraud defined under the laws of your jurisdiction?

The legal definition of tax fraud is: “Whoever, by means of deception or taking advantage of errors, wholly or partially fails to pay taxes or obtains an undue benefit to the detriment of the federal tax authorities, commits the offense of tax fraud.”
How is tax fraud treated? Will the tax authority conduct a criminal investigation with a view to seeking prosecution and a custodial sentence?

Yes, tax authorities first conduct an investigation and put together a file with evidence. Then they formally asked the federal prosecutor to start and investigation and the criminal procedure. If such prosecutor deems that the claim is grounded in law, takes the case to a criminal judge.
Does the tax authority have to abide by any standards or a code of conduct when carrying out audits? Does the tax authority publish any details of how it conducts audits in practice?

Yes, they must conduct according to the rules of a conduct regulations.

Does the tax authority publish any details of how it conducts audits in practice? The conduct regulations are public to be consulted by anyone.
Does the tax authority have the power to compel the production of information? Does this extend to emails? Is there a right of appeal against the use of such a power?

No, they do not. They cannot ask the taxpayers to provide the information in certain way or with certain details.

Does this extend to emails? Is there a right of appeal against the use of such a power? If they ask the taxpayer to produce information in certain way, the taxpayer can later when challenging the final tax assessment, make the argument in court.
Does the tax authority have the power to compel the production of information from third parties? Is there a right of appeal against the use of such a power?

No, they do not. However, they can ask a third party related to the taxpayer for information
Is it possible to settle an audit by way of a binding agreement, i.e. without litigation?

Yes it is possible but in a special procedure called Conclusive Agreement Procedure which is carried out by a third authority called General Attorney for the Defence of the Taxpayer (“PRODECON”) who acts as an intermediator and has to follow certain rules during the procedure. If the parties reach an understanding, they sign an agreement which in prepared by PRODECON.
If a taxpayer is concerned about how they are being treated, or the speed at which an audit is being conducted, do they have any remedies?

Yes, they can file a complaint seeking administrative responsibility of the tax authorities.
If a taxpayer disagrees with a tax assessment, do they have a right of appeal?

Yes, they have legal remedies available provided in the laws.
Is the right of appeal to an administrative body (independent or otherwise) or to a judicial body (i.e. a tribunal or court)?

Both options. Taxpayers have the option to appeal first before the legal unit of the Mexican IRS, or they can appeal directly before the Federal Tax Court.
Is the hearing in public? Is the decision published? What other information about the appeal can be accessed by a third party/the public?

In the cases where a hearing takes place (not in all court procedures are hearings), it is open to the public.

Is the decision published? Yes, but without the sensitive information of the parties and of the resolutions being challenged.

What other information about the appeal can be accessed by a third party/the public? The status of the procedure.
Is the procedure mainly written or a combination of written and oral?

Mainly written.
Is there a document discovery process?

No, but the judges have the power to ask any authority to provide relevant documents.
Are witnesses called to give evidence?

Yes, specially experts in certain fields such
as Accountancy.
Does the burden of proof rest with the taxpayer on an appeal against an assessment?

Yes, since according to the law, resolutions of tax authorities are presumed to be legal as long as it is proven otherwise in court.
How long does an appeal usually take to conclude?

The first phase of the litigation process at the Federal Tax Court lasts approximately 1 year and a half. But the second phase at the Court of Appeals last between 6 and 9 months.
Does the taxpayer have to pay the assessment pending the outcome of the appeal?

Paying it is an option, but it can also be guaranteed. However, there is an special type of appeal where the taxpayer does not have to pay it or guarantee it as long as no procedural arguments are made, only substantial arguments.
Are there any restrictions on who may conduct or appear in the appeal on behalf of the taxpayer?

No, any person can be the legal representative of the taxpayer and can appear in the appeal as such as long as he/she has been granted with sufficient powers to do so.
Is there a cost-shifting system whereby the losing party pays the winning party’s legal and professional costs of an appeal?

No, there is not such a system where a taxpayer pays legal and professional costs of an appeal when losing it. However, there are 3 cases where the authorities pay damages to the taxpayers: (i) when a resolution is revoked due to a total lack of legal grounds or reasoning; (ii) when a challenged assessment contradicts a jurisprudence of the Supreme Court of Justice of the Nation; (iii) when is evident that the authority issuing the resolution is not legally competent.
Is it possible to use alternative forms of dispute resolution, such as voluntary mediation or binding arbitration? Are there any restrictions on when such alternative forms of dispute resolution may be pursued?

Arbitration in tax matters is not applicable in Mexico. However, as mentioned before, there is a voluntary mediation procedure called Conclusive Agreement Procedure.

Are there any restrictions on when such alternative forms of dispute resolution may be pursued? Just the legal deadline to start it. If the taxpayer misses such deadline, it is no longer an option.
Is there a right of onward appeal? If so, what are the levels of onward appeal before the case reaches the highest appellate court?

Yes, the sentence of the Federal Tax Court can be challenged before a Court of Appeals. If a constitutional matters arise during the litigation procedure, the case can be taken in a third phase up to the Supreme Court of Justice of the Nation.
What are the main penalties that can be applied when additional tax is charged? What are the minimum and maximum penalties?

The minimum penalties are 55% of the omitted tax. The maximum penalties are 75%.
If penalties can be mitigated, what factors are taken into account?

Yes they can as long as the taxpayer pays the omitted taxes before the tax audit finishes; or if he/she is willing to pay the tax assessment (once the audit is over) and certain legal requirements are met. Some years Congress issues a law where penalties are forgiven is the taxpayer pays the assessment indexed as per inflation and dismisses the legal remedies filed against it.
Within your jurisdiction, what areas do you think are most likely to be subject to challenge over the next 12 months?

The amendments to the Income Tax Law to be in force in January 2027. They consist in (i) restricting a percentage of deductions and also (ii) restricting the application of a percentage of net operating losses incurred in previous years.
In your opinion, are there any areas that taxpayers are currently finding particularly difficult to deal with when faced with a challenge by the tax authorities?

Many but the most difficult is complying with the materiality requisite. Materiality for tax matters consist in proving to the tax authorities that a service provided by a third party and deducted by the taxpayer, happened. Since such requisite is not provided expressly in the law there are no parameters, so tax authorities require a large amount of documents, photos, videos, presentation cards, accounting records, bank accounts, explanations, deliverables, etc., to have proven that the service was actually provided. If the taxpayer do not have all of that, authorities dismiss the deduction.

Is it necessary for a taxpayer to register with the tax authority? Are separate registrations required for corporate income tax and value added tax/sales tax?

In general terms, when a taxpayer files a tax return, does the tax authority check it and issue a tax assessment, or is there a self-assessment system where the taxpayer’s own assessment stands unless the tax authority intervenes?

Can a taxpayer amend their return after it has been filed? If so, are there any time limits for doing so?

Please summarise the main methods by which a tax authority may challenge the amount of tax a taxpayer has paid by way of an initial assessment/self-assessment. Does the tax authority need any justification to commence such a challenge?

How is tax fraud defined under the laws of your jurisdiction?

How is tax fraud treated? Will the tax authority conduct a criminal investigation with a view to seeking prosecution and a custodial sentence?

Does the tax authority have to abide by any standards or a code of conduct when carrying out audits? Does the tax authority publish any details of how it conducts audits in practice?

Does the tax authority have the power to compel the production of information? Does this extend to emails? Is there a right of appeal against the use of such a power?

Does the tax authority have the power to compel the production of information from third parties? Is there a right of appeal against the use of such a power?

Is it possible to settle an audit by way of a binding agreement, i.e. without litigation?

If a taxpayer is concerned about how they are being treated, or the speed at which an audit is being conducted, do they have any remedies?

If a taxpayer disagrees with a tax assessment, do they have a right of appeal?

Is the right of appeal to an administrative body (independent or otherwise) or to a judicial body (i.e. a tribunal or court)?

Is the hearing in public? Is the decision published? What other information about the appeal can be accessed by a third party/the public?

Is the procedure mainly written or a combination of written and oral?

Is there a document discovery process?

Are witnesses called to give evidence?

Does the burden of proof rest with the taxpayer on an appeal against an assessment?

How long does an appeal usually take to conclude?

Does the taxpayer have to pay the assessment pending the outcome of the appeal?

Are there any restrictions on who may conduct or appear in the appeal on behalf of the taxpayer?

Is there a cost-shifting system whereby the losing party pays the winning party’s legal and professional costs of an appeal?

Is it possible to use alternative forms of dispute resolution, such as voluntary mediation or binding arbitration? Are there any restrictions on when such alternative forms of dispute resolution may be pursued?

Is there a right of onward appeal? If so, what are the levels of onward appeal before the case reaches the highest appellate court?

What are the main penalties that can be applied when additional tax is charged? What are the minimum and maximum penalties?

If penalties can be mitigated, what factors are taken into account?

Within your jurisdiction, what areas do you think are most likely to be subject to challenge over the next 12 months?

In your opinion, are there any areas that taxpayers are currently finding particularly difficult to deal with when faced with a challenge by the tax authorities?

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