A quiet but relevant change in the NF-e ecosystem
While the attention of the tax market is focused on IBS, CBS and split payment, the Federal Revenue Service, Encat and the IBS Management Committee are also moving forward on another front: simplifying the digital signature process for NF-e for small issuers. The technical instrument is Technical Note 2026.001, which regulates the PAA — Provider of Signature and Authorization of Electronic Tax Documents.
Legal basis: from Ajuste SINIEF 9/2022 to Ajuste SINIEF 21/2026
The PAA is not a recent novelty in terms of legal provision: (cite index="52-1,52-2">Ajuste SINIEF 9/22, entered into by CONFAZ and the Brazilian Federal Revenue Service, establishes the legal and regulatory framework for the PAA's operation, allowing the digital signature and the request for authorization of electronic tax documents to be carried out through a duly qualified intermediary service, on behalf of the document's issuer. What changes now is the practical operationalization: (cite index="47-1">Ajuste SINIEF No. 21/2026 amends Ajuste SINIEF No. 9/2022, with the purpose of simplifying the procedures for authorizing the use of Electronic Tax Documents, in accordance with Law No. 14,063/2020. This specific adjustment (cite index="50-4">takes effect on September 1, 2026 and (cite index="50-2">establishes criteria related to registration compliance, digital certification, pre-registration, supporting documentation, and operational requirements necessary for these entities to operate — that is, it creates the qualification rules for the providers themselves.
Technical schedule confirmed by SVRS
Technical Note 2026.001 went through several schedule revisions throughout the year, but the most recent version brought a stable date. (cite index="40-5,40-6">Entry into the homologation (test) environment is scheduled for August 3, 2026, and entry into production is scheduled for October 5, 2026. The postponement in relation to the previous schedule was formalized in July: (cite index="39-1">a technical note (No. 2026.001 – Version 1.02b) published on July 31, 2026 postponed to October 5, 2026 the start of the PAA's production implementation. In operational practice, (cite index="42-1">the NFe Technical Note that releases the sending of electronic tax invoices, model 55, signed and transmitted by issuing platforms on behalf of their represented parties will be available in the production environment of SEFAZ Virtual RS on October 5, 2026.
Who can (and who can't) use the PAA
The model is not for every taxpayer. (cite index="52-5">The use of specialized providers enables greater standardization, reliability, and efficiency in communication with tax authorization environments, especially for audiences such as the Individual Microentrepreneur (MEI), rural producers, and those opting for Simples Nacional. The technical restrictions confirm this scope: (cite index="40-4">the batch sent with the PAA series must contain only one NF-e, and the PAA is not available for taxpayers under the normal regime, with the exception of Rural Producers. The list of eligible profiles also includes the self-employed freight carrier: (cite index="45-1">the PAA accreditation, in compliance with Ajuste SINIEF 21/2026, allows platforms that represent Rural Producers, Self-Employed Freight Carriers, MEI, and those opting for Simples Nacional to qualify as PAA solution providers.
How the technical flow works
The central point of the change lies in eliminating the need for issuers to have their own digital certification infrastructure. (cite index="42-6">The PAA exempts small issuers, such as sellers, self-employed freight carriers, and rural producers, from acquiring a digital certificate and more complex issuance systems, allowing them to use platforms that handle this management and generation of the tax document's XML, along with its digital signature. From the standpoint of contractual and registration linkage, (cite index="49-9">the issuer requests linkage to a qualified PAA on the SEFAZ Virtual RS portal, identifying themselves with a gov.br platform username and password. In the XML, the layout now carries a specific group identifying the provider and a dual layer of signature — the issuer's advanced signature combined with the provider's own ICP-Brasil qualified signature, ensuring legal validity for the document even without the small taxpayer's own certificate.
Tax liability does not change
One point that tax and legal teams need to make clear to clients: the use of the PAA is merely a supporting technology layer. (cite index="49-6,49-7">It is important to reinforce that the use of the PAA does not transfer the issuer's tax liability. The use of the Provider of Signature and Authorization of Electronic Tax Documents does not alter the issuer's legal and tax responsibility regarding the information contained in the electronic tax document issued. In other words, (cite index="49-8">in practice, the PAA acts exclusively as a technical intermediary, without assuming tax authorship or responsibility for the content, accuracy, or tax adequacy of the information declared by the taxpayer.
What to do now, before October
The good news is that there's no need to wait until October to get organized. (cite index="45-2">Accreditation transactions for Signature and Authorization Providers (PAA) and the registration of companies using the PAA platform are already available in the respective menus of the SVRS portal. For tax, accounting, and IT teams serving MEI, rural producers, or Simples Nacional participants, now is the time to: map which clients fit the eligible profile; assess whether it's worthwhile to act as a user of a qualified provider or wait for the market offering to consolidate; review contracts and SLAs with tax system providers regarding compatibility with the infPAA group; and test the flow in the homologation environment before the switch to production on October 5.
This content is for informational purposes only and does not replace guidance from your accounting firm or a qualified tax professional, especially given schedule changes that may still occur before going into production.
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NT 2026.001 (PAA): Provider-Based NF-e Signing Goes Live on October 5, 2026 — What Changes for MEI, Simples, and Rural Producers