Alphanumeric CNPJ: what changes starting in 2026
The Federal Revenue Service has initiated one of the biggest changes in the history of the National Register of Legal Entities (CNPJ). Starting in July 2026, new registrations will no longer have only numbers and will adopt an alphanumeric format, including letters.
This change addresses a practical challenge: the exhaustion of possible combinations in the current 14-digit numeric model. With the adoption of letters, the system will gain virtually unlimited capacity for new registrations, keeping pace with the country's business growth.
What the new format will be like
The CNPJ will continue to have 14 characters, but the logic will be different:
- Root: 8 alphanumeric characters;
- Establishment: 4 alphanumeric characters;
- Check digits: 2 final positions, always numeric. The calculation of the check digits will follow the traditional module 11 formula, with an adjustment: letters will be converted into numeric values by the ASCII table (subtracted by 48).
==It is important to note that existing CNPJs will not be changed. They remain valid, and the change applies only to new registrations starting in 2026.==
Who will receive the new CNPJ
==The alphanumeric format will be assigned exclusively to new registrations in the National Register of Legal Entities. This includes:==
- Newly created companies through Redesim;
- Individual Microentrepreneurs (MEIs);
- Branches of existing companies;
- Condominiums, cooperatives, consortia, and clubs;
- Liberal professionals who choose to operate as a legal entity;
- Rural producers who open a new registration. Thus, current CNPJs remain valid and do not need to be replaced.
Objectives of the change:
- Avoid the exhaustion of possible combinations in the exclusively numeric format;
- Modernize the tax system;
- Ensure availability and scalability for the growth of companies in Brazil. Implementation timeline
The transition was planned progressively, with a total estimated duration of almost two years:
- 10/15/2024: publication of Normative Instruction RFB nº 2.229/2024, which regulates the change;
- 10/25/2024: entry into force of the normative;
- October/2024 to December/2025: development of Federal Revenue systems, creation of APIs, technical documentation, and integration protocols;
- First half of 2026: pre-production phase, with tests with partner agencies and financial institutions;
- July 2026: start of exclusive use of the new alphanumeric format for new registrations.
Impacts for companies and professionals
Although the CNPJs already issued remain valid, the change will require adaptations in systems and processes. This includes databases, ERPs, internal registrations, electronic invoices, integrations with public agencies, and validations in accounting and financial routines.
Main technical adjustments:
- Change databases to alphanumeric fields;
- Update CNPJ validation routines, including the check digit calculation;
- Adapt APIs, ERPs, tax systems, and internal registrations;
- Review integrations with partners using the CNPJ as the primary key.
- Recommended procedures
- Conduct impact planning and system mapping;
- Perform tests in a sandbox environment before production;
- Train technical teams to handle the new format;
- Follow the documentation and guidelines from the Federal Revenue Service.
A structural transformation in the Brazilian business system
The introduction of the alphanumeric CNPJ is an important change to ensure the sustainability of the Brazilian tax system. Although it does not directly affect existing records, it will require attention and preparation from companies, developers, and accountants.
More than a registration change, ==the alphanumeric CNPJ represents a structural evolution in how companies are identified in Brazil==. This adaptation is necessary to support economic growth, process digitalization, and integration between tax, financial, and regulatory systems.
With proper planning, the transition will be gradual, safe, and aligned with the schedule established by the Federal Revenue Service, ensuring that Brazil is ready to support millions of new companies in the coming decades.
If you want to delve deeper into the topic of tax reform and its impacts on companies, check out these two articles: Tax Reform: impacts on companies and Tax Reform: challenges and opportunities, which address structural transformations, risks, and adaptation possibilities for the business sector.
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