{"id":255515,"date":"2025-12-10T11:40:06","date_gmt":"2025-12-10T10:40:06","guid":{"rendered":"https:\/\/www.easyap.com\/?p=253005"},"modified":"2026-07-30T21:49:26","modified_gmt":"2026-07-30T19:49:26","slug":"firma-digital-en-portugal","status":"publish","type":"post","link":"https:\/\/www.easyap.com\/en\/blog\/firma-digital-en-portugal\/","title":{"rendered":"Digital signature in Portugal, mandatory in 2026"},"content":{"rendered":"<p><span style=\"font-weight: 400\">From January 1, 2026, in Portugal, all electronic invoices will require a qualified electronic signature or a qualified electronic seal. This is a legal obligation that marks a before and after in the reliability, traceability, and validity of<\/span><a href=\"http:\/\/www.easyap.com\/workflow-de-aprobacion-de-facturas\/factura-electronica\/\"><span style=\"font-weight: 400\">invoices<\/span><\/a><span style=\"font-weight: 400\">and tax documents. For a CFO operating in Portugal, this requirement impacts internal processes, integrations, document security, audits\u2026. In other words: the entire business. Given its importance, at easyap, we explain<\/span><b>what changes in 2026, what ATCUD is, how this qualified electronic signature is implemented, and the risks to avoid in this regulatory transition<\/b><span style=\"font-weight: 400\">. <\/span><\/p>\n<h2><span style=\"font-weight: 400\">What Changes in 2026? Summary for CFOs<\/span><\/h2>\n<p><span style=\"font-weight: 400\">The first thing to know about the new regulation on<\/span><a href=\"https:\/\/www.easyap.com\/en\/?p=256261\"><span style=\"font-weight: 400\">electronic invoicing in Portugal<\/span><\/a><span style=\"font-weight: 400\">and digital signatures is its application and who it affects:<\/span><\/p>\n<h3><span style=\"font-weight: 400\">1. Legal Obligation<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">From<\/span><b>January 1, 2026<\/b><span style=\"font-weight: 400\">, all invoices will have to include a<\/span><a href=\"https:\/\/www.easyap.com\/en\/?p=256377\"><b>qualified electronic signature or an<\/b> <b>qualified electronic seal<\/b><span style=\"font-weight: 400\">.<\/span><\/a><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Until<\/span><b>December 31, 2025<\/b><span style=\"font-weight: 400\">, PDF invoices without a signature remain valid.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">The measure guarantees the authenticity and integrity of tax documents.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">2. Scope of Application<\/span><\/h3>\n<p><span style=\"font-weight: 400\">The obligation covers:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">B2B Invoicing.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">B2C Invoicing.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Invoicing to Public Administration (B2G).<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Important tax documents circulated in PDF (credit and debit notes, receipts, etc.)<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">All this does not change anything regarding the two mandatory elements that had already appeared as a legal requirement on electronic invoices. These are: <\/span><\/p>\n<ol>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">ATCUD Code, which is the Unique Document Identifier, as we will explain later.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Verifiable QR Code. <\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400\">Both will continue to be necessary and will now coexist with the qualified signature or seal.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">Key Concepts for Understanding Digital Signatures in Portugal<\/span><\/h2>\n<p><span style=\"font-weight: 400\">To be more precise, let&#8217;s analyze the three most important aspects of this new regulation. <\/span><\/p>\n<h3><span style=\"font-weight: 400\">Qualified Electronic Signature<\/span><\/h3>\n<p><span style=\"font-weight: 400\">It is the most advanced form of digital signature, recognized by eIDAS, created using a <\/span><a href=\"https:\/\/www.easyap.com\/en\/?p=256646\"><span style=\"font-weight: 400\">digital certificate<\/span><\/a><span style=\"font-weight: 400\"> qualified issued by an accredited provider. Its legal value is equivalent to a handwritten signature.<\/span><\/p>\n<h3><span style=\"font-weight: 400\">Qualified electronic seal<\/span><\/h3>\n<p><span style=\"font-weight: 400\">Identifies the <\/span><b>company (not the natural person).<\/b><span style=\"font-weight: 400\"> It is ideal for automated mass invoicing processes and guarantees the integrity and authorship of the document.<\/span><\/p>\n<h3><span style=\"font-weight: 400\">ATCUD<\/span><\/h3>\n<p><span style=\"font-weight: 400\">It is the <\/span><b>Unique Document Identifier<\/b><span style=\"font-weight: 400\">, which was already mandatory for all invoices and fiscally important documents. Now, it must be generated from certified software, and each document requires a unique one per series.<\/span><\/p>\n<p><span style=\"font-weight: 400\">All this legal framework is set out in the <\/span><a href=\"https:\/\/www.cepc.gob.es\/biblioteca-y-documentacion\/documentacion\/base-de-datos-docex\/disposiciones\/lei-no-45-a2024-de-31-de-dezembro-orcamento-do-estado-para-2025\"><b>Lei n.\u00ba 45-A\/2024<\/b><\/a><span style=\"font-weight: 400\">. Even so, the Tax Authority often publishes technical nuances, so it is advisable to follow official communications.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">Real operational impact: what will change in your company<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Due to all the above, the transition towards mandatory digital signatures in Portugal entails fundamental internal changes. For companies that have not started the process, adaptation will have to be immediate. Therefore, these four aspects must be considered:<\/span><\/p>\n<h3><span style=\"font-weight: 400\">1. Invoicing<\/span><\/h3>\n<p><span style=\"font-weight: 400\">Your system must:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Generate invoices with <\/span><b>ATCUD.<\/b><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Apply <\/span><b>qualified electronic signature<\/b><span style=\"font-weight: 400\"> or <\/span><b>qualified seal.<\/b><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Integrate with your <\/span><a href=\"https:\/\/www.easyap.com\/en\/?p=256604\"><span style=\"font-weight: 400\">ERP<\/span><\/a><span style=\"font-weight: 400\"> or POS.&nbsp;<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Integrate with the qualified certificate provider.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Have strict SLAs<\/b><span style=\"font-weight: 400\"> for cloud signing, with:<\/span>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">HSM (Hardware Security Module).<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">Auditing of each operation.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">Revocation control.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">Reliable time stamping.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">2. Certificates and custody<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">The certificate must be issued by an <\/span><b>accredited provider<\/b><span style=\"font-weight: 400\"> under eIDAS.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">It can be:<\/span>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">For natural persons (qualified signature).<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">For entities (qualified seal).<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Key custody must be in <\/span><b>HSM<\/b><span style=\"font-weight: 400\"> or certified cloud providers.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Do not store keys on local devices without control and encryption.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">3. Internal control and auditing<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Complete record of all applied signatures.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Exportable audit logs.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Signature evidence (visible or hidden).<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Preservation system that guarantees <\/span><b>immutability<\/b><span style=\"font-weight: 400\">.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Document retention compatible with Portuguese regulations.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">4. Costs and governance<\/span><\/h3>\n<p><span style=\"font-weight: 400\">Compliance with all these aspects, simultaneously, <\/span><b>involves the following costs and actions:&nbsp;<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Generate qualified certificates.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Costs per seal or signature.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Costs of integrating an ERP and an invoicing module.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">HSM custody costs.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Process training and updates.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Assign roles:<\/span>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">Tax compliance manager.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"2\"><span style=\"font-weight: 400\">Technical manager (IT\/Infrastructure).<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">Example of what mandatory digital signature entails<\/span><\/h2>\n<p><span style=\"font-weight: 400\">To better understand how to comply with mandatory digital signature in Portugal, let&#8217;s look at a use case:<\/span><\/p>\n<h3><span style=\"font-weight: 400\">Company: Lusitania S.L. (manufacturing)<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Headquarters: Spain.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Subsidiary: Portugal.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Volume: 45,000 invoices per year.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">Solution adopted<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">The corporate ERP incorporates a local Portuguese module.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">The system automatically requests a qualified seal via API from a certified cloud provider.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">The invoice is generated in XML-PT\/CIUS-PT, the ATCUD is added, the QR is created, and only then is the seal applied on the server.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">Result<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Invoices are issued with a qualified seal and are fully valid from 1\/1\/2026.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Complete audits of all invoicing are facilitated.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">All operational risk is reduced.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">Minimum technical requirements your invoicing software must meet<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Therefore, and in a context where e-invoicing in Portugal is already highly regulated, your technological solution must support:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Automatic generation of <\/span><b>ATCUD.<\/b><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Qualified electronic signature or qualified seal.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Custody and key rotation in <\/span><b>HSM.<\/b><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">APIs for integration with ERP and back-office systems.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Signing capability <\/span><b>in batch<\/b><span style=\"font-weight: 400\"> and <\/span><b>in real-time.<\/b><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Export of logs and evidence for auditing.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Compatibility with <\/span><b>CIUS-PT<\/b><span style=\"font-weight: 400\">, signed PDF and QR.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">Risks for your business if you don&#8217;t adapt in time<\/span><\/h2>\n<p><span style=\"font-weight: 400\">The worrying and dangerous aspect of not complying with the regulations by January 2026 is that you expose yourself to certain risks:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Penalties<\/b><span style=\"font-weight: 400\"> for issuing documents that do not comply with the new legal provision.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Loss of probative value<\/b><span style=\"font-weight: 400\"> in disputes with suppliers or during audits.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Operational errors<\/b><span style=\"font-weight: 400\"> by having to re-process entire batches of invoices.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>ERP system blockage<\/b><span style=\"font-weight: 400\"> if there isn&#8217;t good integration for automatic signing.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Additional costs<\/b><span style=\"font-weight: 400\"> due to having to implement emergency solutions or work with unplanned suppliers.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">Best practices for secure implementation<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Similarly, we will reveal best practices for complying with mandatory digital signatures in Portugal:&nbsp;<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Use a <\/span><b>qualified seal<\/b><span style=\"font-weight: 400\"> for bulk invoicing.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Use the <\/span><b>qualified signature<\/b><span style=\"font-weight: 400\"> on sensitive or high-value invoices.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Always work <\/span><b>with HSM or with certified cloud services<\/b><span style=\"font-weight: 400\">.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Periodically audit<\/b><span style=\"font-weight: 400\"> the traceability of signatures and ATCUD.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Perform a <\/span><b>pilot by series<\/b><span style=\"font-weight: 400\"> before going live.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Establish a <\/span><b>strict recovery and re-issuance policy<\/b><span style=\"font-weight: 400\"> for invoices.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">To make everything clearer and in a unified visual format, here is a table with risks, best practices\u2026 and how easyap helps you comply with mandatory digital signatures if you operate in Portugal.<\/span><\/p>\n<table style=\"width: 1105px\">\n<p><b>Risk<\/b><br \/>\n<b>Best Practice&nbsp;<\/b><br \/>\n<b>What easyap provides<\/b><\/p>\n<p><span style=\"font-weight: 400\">Invalid invoices and penalties<\/span><br \/>\n<span style=\"font-weight: 400\">Always use a qualified seal or signature<\/span><br \/>\n<span style=\"font-weight: 400\">Integrated signature \/ seal with automatic ATCUD<\/span><\/p>\n<p><span style=\"font-weight: 400\">Operational standstill<\/span><br \/>\n<span style=\"font-weight: 400\">Automate signing and validation<\/span><br \/>\n<span style=\"font-weight: 400\">Batch and real-time signing engine<\/span><\/p>\n<p><span style=\"font-weight: 400\">Lack of traceability<\/span><br \/>\n<span style=\"font-weight: 400\">Use of logs, timestamps, and legal preservation<\/span><br \/>\n<span style=\"font-weight: 400\">Audit portal and secure custody<\/span><\/p>\n<p><span style=\"font-weight: 400\">Risk of fraud or manipulation<\/span><br \/>\n<span style=\"font-weight: 400\">Custody in HSM and encryption<\/span><br \/>\n<span style=\"font-weight: 400\">eIDAS certified cloud HSM<\/span><\/p>\n<p><span style=\"font-weight: 400\">Urgent last-minute costs<\/span><br \/>\n<span style=\"font-weight: 400\">Plan pilot by series<\/span><br \/>\n<span style=\"font-weight: 400\">Guided onboarding + expert support<\/span><\/p>\n<\/table>\n<h2><span style=\"font-weight: 400\"><br \/>\nWhy easyap is the best option for complying with digital invoicing<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Adopting mandatory digital signatures in Portugal affects the technological architecture, tax compliance, and financial processes of the entire organization. In this scenario, easyap is the ideal partner for companies operating in Portugal.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Our e-invoicing platform is ready to manage ATCUD, QR, electronic signature and qualified seal, and legal retention from a centralized environment. This way, you maintain financial flows without interrupting your ERP.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Specifically, easyap automates signatures via a secure API, with HSM custody, timestamping, and comprehensive auditing. This guarantees Portuguese regulatory compliance and eliminates manual tasks, prevents errors, reduces costs, and offers traceability for audits.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Furthermore, we combine technical expertise and tax knowledge, making implementation guided, fast, and risk-free. For a CFO, this translates into lower complexity, reduced exposure to penalties, and a smooth transition towards the 2026 mandate.<\/span><a href=\"https:\/\/www.easyap.com\/en\/contacto\/\"><span style=\"font-weight: 400\">Contact us<\/span><\/a><span style=\"font-weight: 400\"> and we&#8217;ll show you. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>From January 1, 2026, in Portugal, all electronic invoices will require a qualified electronic signature or a qualified electronic seal. This is a legal obligation that marks a before and after in the reliability, traceability, and validity ofinvoicesand tax documents. For a CFO operating in Portugal, this requirement impacts internal processes, integrations, document security, audits\u2026. [&hellip;]<\/p>\n","protected":false},"author":22,"featured_media":253007,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[269],"tags":[],"class_list":["post-255515","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mandatory Digital Signature in Portugal 2026<\/title>\n<meta name=\"description\" content=\"All about digital signatures in Portugal: obligations from 01\/01\/2026 for invoices and how to prepare ERP, ATCUD, and the qualified signature.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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