BDO Indirect Tax News

Spain’s government has published the long-awaited Ministerial Order establishing the technical and operational framework for mandatory B2B e-invoicing. Effective 6 October 2026, the Order starts the implementation timeline: Businesses with annual turnover exceeding EUR 8 million must comply as from 6 October 2027, while other taxpayers must comply from 6 October 2028. Multinational groups operating in Spain, international finance functions overseeing shared service centres and ERP transformation teams managing global e-invoicing roadmaps should move from monitoring the rules to preparing their systems, data and processes for implementation.

The issuance of the Ministerial Order is the latest—and most decisive—step in Spain’s e-invoicing journey (for prior coverage, see the following articles in Indirect Tax News: April 2026, January 2025 and July 2023). The Order should not be treated as a technical footnote. It provides the final regulatory detail needed for Spain’s e-invoicing mandate to operate, and its entry into force on 6 October triggered the phased implementation timetable.

This article sets out applicable deadlines, explains the principal technical and operational requirements for e-invoicing, and identifies practical steps businesses should take now.

Implementation Timeline

The Order’s entry into effect triggered a two-stage implementation timetable for mandatory e-invoicing, based on the annual turnover of each business in the immediately preceding calendar year:

• Businesses with annual turnover exceeding EUR 8 million: 12 months after the Order's entry into force, i.e., 6 October 2027;
• All other businesses and professionals (including most small and medium-sized enterprises and individuals): 24 months after the Order's entry into force, i.e., 6 October 2028.

Several related deadlines run off the same two triggers and are worth flagging:

• Private platforms: Interconnection, interoperability and "verifiable copy" obligations will apply from 6 October 2027, regardless of the size of the business.
• Large businesses: During the first 12 months that mandatory e-invoicing applies, e-invoices must be accompanied by a machine-readable PDF version, unless the recipient agrees to accept the original e-invoice.
• Smaller taxpayers (individuals, attribution-of-income entities and taxpayers with turnover of less than EUR 8 million): Invoice reporting will remain voluntary until around October 2029.
• Public sector contract subcontractors: Such subcontractors must migrate to the new system by 6 October 2028.
• Tax authorities’ public portal: The public portal must be live by 6 August 2027, two months before the first deadline.

Key Features of the Order

The Order sets out the core technical and operational components of the e-invoicing framework:

• The functioning of the public e-invoicing portal developed by the tax authorities;
• Invoice format and mandatory content;
• “Verifiable copies" of invoices issued outside the tax authorities’ portal that must be transmitted to the public platform;
• Interoperability between private platforms and the public portal;
• Reporting of invoice status and payment information; and
• Procedures for consultation, submitting, validating, correcting and retrieving invoices.

Collectively, these rules define how invoices between businesses operating in Spain must be structured, transmitted, tracked and retained.

The Order also confirms the following:

• Businesses and in-scope self-employed professionals will be required to issue and receive structured, machine-readable e-invoices from the relevant effective dates.
• Invoices issued or interconnected through the public portal must follow the European semantic data model EN 16931, using UBL (Universal Business Language) syntax.
• Businesses will not be required to abandon existing private e-invoicing platforms. They may continue to issue and receive invoices through private platforms, through the tax authorities’ portal or through a combination of both, consistent with the interoperability model.
• Where a business uses a private platform to issue an invoice, it must simultaneously transmit a verifiable electronic copy, in UBL syntax, to the public portal. That copy must reproduce, with semantic equivalence, the content of the original invoice, subject to the minimum mandatory content already required under Spain's general invoicing regulations.
• To increase transparency over commercial payment terms, the Order introduces “invoice lifecycle” reporting. Invoice recipients will be required to electronically report specified events in the life of an invoice to the public portal, including rejection, the payment due date and the date of effective full payment. Invoice issuers will be able to voluntarily report whether an invoice has been collected or remains unpaid, including any discrepancies with the dates reported by the recipient.

The B2B e-invoicing mandate is separate from Verifactu, a complementary regime governing the integrity, traceability and reporting functions of invoicing software (for prior coverage of Verifactu, see the article in the January 2026 issue of Indirect Tax News). Where applicable, a Verifactu invoice may also form part of the B2B e-invoicing process, and the Order’s data model includes the relevant QR information. Verifactu was scheduled to become effective on 1 January 2027 for corporate taxpayers and 1 July 2027 for other taxpayers, but the Ministry of Finance recently announced that the regime may be further postponed until October 2028.

Implementation Challenges

These requirements will affect not only invoice formats and transmission channels but also the systems, data and business processes used to create, receive, monitor and retain invoices. Implementing the framework will likely create practical challenges that businesses should begin mapping now, including the following:

• ERP and invoicing system configuration: Businesses will need to assess whether existing systems can create, receive and retain compliant UBL invoices and verifiable copies, while supporting the required data fields and controls.
• Connectivity and validation handling: Businesses and their platform providers will need automated processes to submit invoices and copies, interpret validation responses, manage rejections and corrections, and address exceptions.
• Accounts payable (AP) and accounts receivable (AR) process redesign: AP and AR workflows will have to capture due dates, receipt dates and payment confirmation dates in a structured, system-extractable format.
• Master data governance: Accurate and complete customer, supplier, tax and payment data will be essential to prevent rejections and mismatches.
• Reporting and monitoring: Tax and finance teams will need mechanisms to track invoices and copies across the group, identify rejected or unmatched items, and resolve discrepancies before they create compliance or cash-flow issues.

Why Businesses Should Start Preparing Now

Although the first compliance deadline is a year away, the required systems, data and process changes will demand coordinated planning across tax, finance, AP and AR, and technology functions. Experience with comparable mandatory e-invoicing and digital reporting regimes shows that businesses face the greatest difficulty when they wait until deadlines are imminent before assessing the required changes and action steps.

Affected businesses should focus on the technical and operational requirements that will shape their implementation programmes, such as by assigning ownership for the programme and establishing a cross-functional team to assess systems, data, processes and platform arrangements. Next steps should include reviewing the current invoicing model, identifying gaps against the new requirements, setting priorities and developing an implementation roadmap with sufficient time for configuration, testing and remediation.

Alvaro Gómez-Elvira
Ana Iglesias Querol
BDO in Spain