Uruguay: Tax Authority Changes Public Key for e-Invoicing Test Environment

Uruguay’s Tax Authority has changed the public key used in its e-Invoicing test environment for test RUT 219999830019. A new public certificate, valid until September 6, 2028, is available. Providers using this test setup should review their integrations and update the certificate where required.

Uruguay’s Tax Authority announced a technical change to its electronic invoicing test environment. The public key associated with the test RUT 219999830019 has been changed, and the Tax Authority has published a new public certificate that is valid until September 6, 2028.

This is a test-environment update, not a change to the production Electronic Fiscal Document (Comprobante Fiscal Electrónico – CFE) rules. Its immediate relevance is therefore primarily for e-Invoicing software providers, developers, integrators and businesses that use Tax Authority’s testing or homologation environment and rely on the affected test RUT.

Systems that have stored or configured the previous public certificate should determine whether it needs to be replaced before further testing. The exact technical action will depend on how each solution handles the certificate and public key within its integration.

According to the announcement from Tax Authority’s IT Division, the public key for the test environment associated with RUT 219999830019 has changed.

The Tax Authority has consequently made a new public certificate available. The certificate is valid until September 6, 2028.

The test RUT itself is not new. The Tax Authority's technical documentation identifies 219999830019 as one of the RUT numbers available for testing purposes in its electronic invoicing web-service environment.

For businesses and software providers, the important distinction is between the public key and the certificate containing or supporting the relevant public-key information. The Tax Authority’s announcement refers to a public-key change and provides the corresponding new public certificate that users of the test environment may need to incorporate into their technical configuration.

Based on the Tax Authority announcement, no production certificate or production public-key change has been announced as part of this update.

The notice specifically identifies the test environment and the test RUT 219999830019. Businesses should therefore avoid interpreting the announcement as a change to the certificates used for live electronic fiscal document issuance or as a modification of Uruguay’s substantive e-Invoicing requirements.

Uruguay distinguishes between testing/certification activities and the production environment. The Tax Authority certification documentation explains that applicants and electronic issuers use the homologation environment to perform test activities before authorization for production.

Once the required certification process is successfully completed and the Tax Authority authorizes the taxpayer as an electronic issuer, the taxpayer is registered in the production environment and may issue legally valid electronic fiscal documents according to the applicable rules.

The September 2026 certificate update should therefore be understood within this testing and technical-integration context.

Impact on e-Invoicing testing and certification

The main operational risk is not a change in the legal electronic fiscal document process but a mismatch between the updated Tax Authority test environment and locally configured test systems.

The Tax Authority’s homologation environment is used to test electronic invoicing functionality before production. Official documentation confirms that businesses and providers generate and send test electronic fiscal documents to the Tax Authority to verify their systems and correct technical issues before production authorisation.

The update does not introduce a new electronic fiscal document type, change invoice content, modify POS transaction rules or establish a new taxpayer deadline for production E-Invoicing.

What should software providers and businesses do?

Teams using the Tax Authority’s test environment should first determine whether their current configuration uses the public certificate associated with test RUT 219999830019.

Where the previous certificate is installed or referenced, technical teams should download the new certificate directly from the Tax Authority and update the relevant test configuration according to their existing integration design. After the update, standard integration tests should be performed to confirm that communication with the test environment continues to operate correctly.

Providers should also record the new validity date of September 6, 2028 in their certificate-management or technical-maintenance processes so that a future expiry does not become an unexpected integration issue.

From an e-Invoicing compliance perspective, the most important point is to keep the scope of the announcement clear. This is not a new fiscal rule or production migration requirement. It is a technical infrastructure update affecting the Tax Authority test environment.

For providers that regularly use Uruguay’s homologation environment, however, such certificate changes should be treated as part of normal integration maintenance. Test and production certificates should also be managed separately to avoid applying a test-environment change to a live electronic fiscal document configuration.

The new certificate published by the Tax Authority is available through the official eFactura portal DGI – Public certificate for the test environment, valid until September 6, 2028

The principal source for this article is the Tax Authority’s announcement. Source

Ivana Picajkić, Medior Legal Consultant at Fiscal Solutions

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