Lawmakers approve the Income Tax Law in detail; curb deductions for large companies

The Chamber of Deputies approved changes to Mexico’s Income Tax Law in particular, meaning provisions were considered article by article. The reported direction is tougher treatment for large companies, especially through limits on deductions. The text also identifies an expansion of the income ceiling for RESICO, a regime affecting smaller businesses and taxpayers.

The supplied headlines do not list every approved article or give the exact new deduction limits. They do identify two central measures: restricting deductions for large companies and raising the RESICO income threshold. The changes are presented as reforms that could affect businesses and entrepreneurs.

The measure is not yet described as fully effective. Another headline says the reform was sent to the Finance and Public Credit Committee and the First Legislative Studies Committee. The material also references a 2027 reform, but it does not provide a complete implementation schedule or the final wording.

ISR stands for Impuesto Sobre la Renta, or Income Tax. It is a tax on income recognized under Mexico’s Income Tax Law. The supplied headlines focus on changes to that law, but they do not define ISR or list its taxable categories. This definition therefore relies on established tax knowledge rather than a detail stated in the source.

In general, the law covers income earned by individuals and companies. Examples include wages, business profits, professional fees, rents, interest, and gains from selling assets. The exact treatment depends on the taxpayer and the type of income. Tax rules normally distinguish total income from the amount left after permitted adjustments and deductions.

The reform matters because changing deductions or regime limits can change how much income is taxed. The headlines specifically connect the proposal with large-company deductions and the RESICO income ceiling. They do not describe changes to every kind of income or provide the final tax rates.

The reported reform would put a brake on deductions claimed by large companies. Deductions matter because they reduce the income base on which tax is calculated. Limiting them could make more of a company’s earnings subject to ISR. The supplied headlines do not identify whether the affected items are interest, investment, losses, payments, or another category.

For example, a company with revenue of 100 and permitted costs and deductions totaling 70 has taxable profit of 30. If a rule disallows 10 of those deductions, taxable profit rises to 40. The company would then calculate its tax on the larger amount, assuming the applicable rate stays unchanged. This illustrates the mechanism, not a figure from the article.

The headlines frame the measure as pressure on large businesses and as one of the changes approved by deputies. The final effect depends on the text eventually adopted. The source does not state the new caps, affected industries, or projected tax collection.

RESICO is the regime named in the supplied headlines, and its income limit would be expanded under the proposed ISR reform. Raising that ceiling could let more businesses remain eligible for the regime. The source does not state the current limit, the new limit, or the size of the increase in pesos.

The concrete figure provided is an estimate from Concanaco: 300,000 businesses could benefit. The mechanism is straightforward. Businesses whose income previously exceeded the permitted ceiling might qualify if the ceiling rises, provided they meet the regime’s other conditions. This explanation describes the likely operation of an income threshold; the headlines do not provide those additional conditions.

The measure appears alongside the restrictions on large-company deductions and is presented as part of an ISR reform. Its practical reach will depend on the final legal text and implementation. Based on the supplied material, the clearest quantified expectation is Concanaco’s estimate of 300,000 potential business beneficiaries.

If the deduction limits become law, large companies could have more taxable income. With fewer permitted deductions, their tax calculations would start from a larger base. That could increase their ISR bills, although the supplied text gives no rates, company examples, or revenue estimate. The headlines describe the policy as a brake on deductions and as pressure on entrepreneurs.

Smaller businesses could see a different effect from the RESICO change. If the income ceiling rises, businesses that were previously above the limit might qualify for the regime. Concanaco estimates that 300,000 businesses could benefit. The number is an estimate, and the source does not explain how many would newly enter or what savings each might receive.

The overall result is therefore mixed: tighter deductions for large companies and potentially broader access for smaller businesses. The final impact depends on approval and implementation. The supplied headlines indicate the reform was approved by deputies in particular and sent to committees, but do not establish that it is already in force.

The Chamber of Deputies is the body reported to have approved the ISR reform article by article. In Mexico’s legislative process, the Senate then reviews bills sent from the lower chamber. The supplied headlines say the reform was turned to the Finance and Public Credit Committee and the First Legislative Studies Committee, identifying the next review stage.

Committees examine a bill’s content and prepare work for the relevant chamber. The Finance and Public Credit Committee focuses on fiscal and tax matters, while the legislative studies committee examines legal wording and legislative structure. These descriptions use standard legislative knowledge; the source only names the committees and says the reform was sent to them.

Approval by deputies in particular does not by itself establish that the tax reform is in force. The Senate process and any remaining formal steps must be completed under the applicable procedure. The supplied text does not state whether the Senate approved the measure, whether it was enacted, or when the changes would begin.

Business deductions exist so tax is generally based on profit, not on every peso of sales. A company must spend money to operate, produce goods, or provide services. Allowing qualifying costs to be deducted recognizes that those costs reduce the income actually available as profit. This explanation uses standard tax knowledge because the supplied article only reports limits on large-company deductions.

For example, a company with revenue of 1,000 and operating costs of 600 has 400 before additional deductions. If it can claim 100 in allowable deductions, taxable profit becomes 300. If a reform disallows 40, taxable profit becomes 340. The tax rate would then apply to the larger taxable amount, assuming other rules remain unchanged.

This is why the reported brake on large-company deductions matters. It could raise the amount subject to ISR without changing revenue. The source does not identify the deductions, caps, rates, or industries affected. The final outcome depends on the enacted rules and their implementation.