isrnot.mx

What It Is

ISRNot is an online ISR (Impuesto Sobre la Renta) calculator from TotalNot. It is primarily aimed at Mexican notaries and is designed to assist with personal income tax calculations in real estate transfer and acquisition scenarios. The page clearly states that notaries remain legally responsible for the calculation, withholding, and payment of taxes, and that results generated by the system should not be treated as official information.

Core Features and Integrations

The product is centered on ISR calculations for real estate transactions. It supports calculations based on historical dates and includes the corresponding inflation updates and late-payment charges. It also covers different update methods permitted by the tax authorities. Its business output features are practical: users can generate personalized reports and export them as PDF or Excel files. For sharing, calculation information can be sent via email as well as instant messaging channels such as WhatsApp, Telegram, and Facebook. In terms of integration, ISRNot can automatically transfer information to FacturaNot for creating tax-withholding CFDI documents, and it can also display calculation details in DeclaraNot Plus. This makes it a good fit for notary offices already using the TotalNot ecosystem.

Pricing and Deployment

The page mentions a free version and includes a “Precios” entry point, but the captured page text does not disclose specific plans or pricing. The terms state that some services require a contract, activation or registration, and payment before they can be used. For deployment, the text indicates that the service is provided online through the isrnot.mx portal. There is no mention of self-hosting, local deployment, an open API, or developer documentation.

Security, Compliance, and Support

The privacy notice is based on Mexican personal data protection regulations. It states that the service may collect names, addresses, phone numbers, email addresses, banking data, and tax data, and that it uses cookies and web beacons. Users may exercise rights of access, rectification, cancellation, and objection. However, the notice also says that data may be transferred domestically or internationally to affiliated companies, service providers, or competent authorities. In terms of support, TotalNot mainly provides technical support for interoperability between the calculator and purchased add-on services, and does not provide support for discrepancies arising from calculations obtained through other methods.

Pros, Cons, and Best Fit

Its strengths are a clearly defined vertical use case, convenient report export and sharing, and integration with FacturaNot and DeclaraNot Plus, which can reduce duplicate data entry in notarial tax workflows. Its weaknesses are the lack of public information on pricing, permission management, team collaboration, APIs, and service levels, and the fact that the results are for reference only. It is best suited to Mexican notary offices and tax/documentation teams already using the TotalNot ecosystem. The page does not explain access from China or cross-border payment options. Since the tool is tightly tied to Mexico’s tax system, local alternatives or general-purpose tax tools are likely more practical for Chinese users.