{"id":255806,"date":"2025-10-06T07:00:13","date_gmt":"2025-10-06T05:00:13","guid":{"rendered":"https:\/\/www.easyap.com\/?p=252627"},"modified":"2026-08-17T14:59:54","modified_gmt":"2026-08-17T12:59:54","slug":"como-numerar-facturas-de-forma-correcta","status":"publish","type":"post","link":"https:\/\/www.easyap.com\/en\/blog\/como-numerar-facturas-de-forma-correcta\/","title":{"rendered":"How to correctly number invoices?"},"content":{"rendered":"<p><span style=\"font-weight: 400\">Invoice numbering is a \u201cthree-in-one\u201d: a legal requirement, an internal control mechanism, and an indispensable practice for a business&#8217;s financial traceability. Incorrectly numbering invoices can lead to penalties from the Tax Agency, accounting errors, and audit complications. In these lines, we explain <\/span><b>how to number invoices<\/b><span style=\"font-weight: 400\">, <\/span><b>what the regulation in Spain requires and when it is mandatory to use different series.<\/b><span style=\"font-weight: 400\"> We&#8217;ll show you with examples and demonstrate how with easyap you <\/span><a href=\"https:\/\/www.easyap.com\/en\/workflow-de-aprobacion-de-facturas\/\"><b>automate accounting<\/b><\/a><span style=\"font-weight: 400\">, save money, and avoid risks.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">What is invoice numbering and why is it so important?<\/span><\/h2>\n<p><span style=\"font-weight: 400\">First, it&#8217;s important to understand the concept: <\/span><b>invoice numbering<\/b> <b>is the unique, correlative, and ordered sequence assigned to each invoice issued by a company.<\/b><span style=\"font-weight: 400\"> Furthermore, it is much more than a simple internal organization code, as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>It has legal and tax validity.<\/b><span style=\"font-weight: 400\"> Regulations require all invoices to have a unique identifying number.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Ensures traceability.<\/b><span style=\"font-weight: 400\"> It allows you to follow the cycle of an operation from beginning to end.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Prevents duplicates.<\/b><span style=\"font-weight: 400\"> A repeated number can invalidate an invoice or lead to penalties.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Facilitates accounting and auditing.<\/b><span style=\"font-weight: 400\"> An ordered sequence simplifies the review of accounting ledgers and financial reports.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">In short, numbering not only organizes but also protects the company from the Tax Agency and ensures your financial management is transparent.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">What does the Invoicing Regulation say about how to number invoices?<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Legally, the <\/span><a href=\"https:\/\/www.easyap.com\/en\/blog\/el-reglamento-de-facturacion-electronica-en-espana\/\"><b>invoicing regulation<\/b><\/a> <span style=\"font-weight: 400\">(officially named <\/span><a href=\"https:\/\/www.boe.es\/buscar\/act.php?id=BOE-A-2012-14696\"><span style=\"font-weight: 400\">Royal Decree 1619\/2012, of November 30<\/span><\/a><span style=\"font-weight: 400\">) clearly establishes how invoices must be numbered in Spain. Specifically, it states the following:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Numbering must be <\/span><b>correlative<\/b><span style=\"font-weight: 400\"> within each series.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Each invoice must have a <\/span><b>unique number<\/b><span style=\"font-weight: 400\"> that identifies it.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">You can create <\/span><b>several invoicing series<\/b><span style=\"font-weight: 400\">, but each of them must be correlative within itself.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">The <\/span><b>numbering format<\/b> <b>is flexible<\/b><span style=\"font-weight: 400\">: it can be just a number (001, 002, 003\u2026), or combine numbers and letters (2025-001, A-2025-015\u2026).<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">It is mandatory for the numbering to be <\/span><b>uninterrupted<\/b><span style=\"font-weight: 400\">, unless you change series with a valid legal justification.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">In other words, you cannot &#8216;skip&#8217; numbers, repeat them, or arbitrarily reset the numbering.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">When should you use different invoicing series?<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Nevertheless, the regulations themselves foresee that in certain situations it may be necessary or advisable to use <\/span><b>differentiated numbering series<\/b><span style=\"font-weight: 400\">. Some common cases are:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>When issuing<\/b> <a href=\"https:\/\/www.easyap.com\/en\/?p=256781\"><b>corrective invoices<\/b><\/a><b>.<\/b><span style=\"font-weight: 400\"> In this case, they must have a specific series that is different from the general one.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>When a company has several establishments or branches.<\/b><span style=\"font-weight: 400\"> Here, each center can maintain its own series, provided it is consecutive.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Invoicing in different fiscal years.<\/b><span style=\"font-weight: 400\"> Although it is not mandatory, many companies reset the numbering each year with a new series (for example: 2024-001, 2025-001).<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Companies with various types of operations.<\/b><span style=\"font-weight: 400\"> Some companies invoice under different regimes (general, equivalence surcharge, reverse charge mechanism\u2026), so they often differentiate their series.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>With clients or for special projects.<\/b><span style=\"font-weight: 400\"> Some companies prefer to create specific series to quickly identify invoicing by client, by project, or by business line.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">How to number invoices to avoid errors<\/span><\/h2>\n<p><span style=\"font-weight: 400\">As everything is better understood with practical examples, below we show you how to correctly number invoices in different scenarios:<\/span><\/p>\n<table style=\"width: 931px\">\n<p><b>Situation<\/b><br \/>\n<b>Recommended series<\/b><br \/>\n<b>Numbering example<\/b><\/p>\n<p><span style=\"font-weight: 400\">General annual invoicing<\/span><br \/>\n<span style=\"font-weight: 400\">By fiscal year<\/span><br \/>\n<span style=\"font-weight: 400\">2025-001, 2025-002, 2025-003\u2026<\/span><\/p>\n<p><span style=\"font-weight: 400\">Corrective invoices<\/span><br \/>\n<span style=\"font-weight: 400\">Independent series<\/span><br \/>\n<span style=\"font-weight: 400\">R-2025-001, R-2025-002\u2026<\/span><\/p>\n<p><span style=\"font-weight: 400\">Two different branches<\/span><br \/>\n<span style=\"font-weight: 400\">By branch<\/span><br \/>\n<span style=\"font-weight: 400\">MAD-001, MAD-002\u2026 \/ BCN-001, BCN-002\u2026<\/span><\/p>\n<p><span style=\"font-weight: 400\">Different business lines<\/span><br \/>\n<span style=\"font-weight: 400\">By product or service<\/span><br \/>\n<span style=\"font-weight: 400\">SW-001, SW-002\u2026 \/ CONS-001, CONS-002\u2026<\/span><\/p>\n<p><span style=\"font-weight: 400\">Strategic client with separate control<\/span><br \/>\n<span style=\"font-weight: 400\">Per client<\/span><br \/>\n<span style=\"font-weight: 400\">CLIENT_A-001, CLIENT_A-002&#8230;<\/span><\/p>\n<\/table>\n<p><span style=\"font-weight: 400\">In all these cases, avoid common errors such as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Restarting numbering within the same year without legal reason.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Duplicating numbers on different invoices.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">Skipping numbers (for example, going from 2025-010 to 2025-012 without issuing 2025-011).<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">Example of how to number invoices correctly step-by-step<\/span><\/h3>\n<p><span style=\"font-weight: 400\">Imagine your company issues invoices in 2025, and there are three distinct scenarios: general invoicing, corrective invoices, and a new center you&#8217;ve opened in Barcelona. Let&#8217;s see how the correct numbering should be in each case:<\/span><\/p>\n<h4><span style=\"font-weight: 400\">1. General invoicing (annual series per fiscal year)<\/span><\/h4>\n<p><span style=\"font-weight: 400\">The usual practice is to create a <\/span><b>series that restarts every year<\/b><span style=\"font-weight: 400\"> and follows a correlative order. That is:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">2025-001<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">2025-002<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">2025-003<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">2025-004<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Each new invoice increments the previous number by one. There are no skips or duplicates. Furthermore, when changing fiscal years, you would restart from 2026-001.<\/span><\/p>\n<h4><span style=\"font-weight: 400\">2. Corrective invoices (independent series)<\/span><\/h4>\n<p><span style=\"font-weight: 400\">If you want to correct an already issued invoice, regulations require it to be issued with a <\/span><b>different series<\/b><span style=\"font-weight: 400\">. That is:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">R-2025-001<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">R-2025-002<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Here, the &#8220;R&#8221; indicates that it is a corrective invoice. This series must also be correlative and cannot be mixed with the general series.<\/span><\/p>\n<h4><span style=\"font-weight: 400\">3. Multiple billing centers (series per location)<\/span><\/h4>\n<p><span style=\"font-weight: 400\">If you open a new center in Barcelona and bill from there, you have to create a <\/span><b>series for that location<\/b><span style=\"font-weight: 400\">. For example:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">MAD-2025-001 (Madrid)<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">MAD-2025-002<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">BCN-2025-001 (Barcelona)<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><span style=\"font-weight: 400\">BCN-2025-002<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Each location has its own independent and correlative sequence. This way, you have better accounting traceability and simplify audit processes.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">Comparison: how easyap manages numbering versus competitors<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Precisely, technology plays a vital role when numbering invoices. <\/span><b>Software like easyap&#8217;s<\/b><span style=\"font-weight: 400\"> offers you essential advantages and functionalities, compared to other competitors:<\/span><\/p>\n<table>\n<p><b>Criterion<\/b><br \/>\n<b>Easyap<\/b><br \/>\n<b>Competitors (Holded, Declarando, Edicom, Seres\u2026)<\/b><\/p>\n<p><b>Numbering Automation<\/b><br \/>\n<span style=\"font-weight: 400\">Flexible in series and sub-series.<\/span><br \/>\n<span style=\"font-weight: 400\">Limited advanced customization.<\/span><\/p>\n<p><b>Legal Compliance<\/b><br \/>\n<span style=\"font-weight: 400\">Approved and ready for international and national regulations.<\/span><br \/>\n<span style=\"font-weight: 400\">More focus on SMEs\/freelancers, without as much legal robustness in complex environments.<\/span><\/p>\n<p><b>ERP Integration<\/b><br \/>\n<span style=\"font-weight: 400\">Total (SAP, Oracle, Microsoft Dynamics and others).<\/span><br \/>\n<span style=\"font-weight: 400\">Limited in more basic tools; they require manual processes.<\/span><\/p>\n<p><b>Scalability<\/b><br \/>\n<span style=\"font-weight: 400\">Designed for companies with high invoicing volume and multiple subsidiaries.<\/span><br \/>\n<span style=\"font-weight: 400\">Aimed at smaller companies; they may fall short in global operations.<\/span><\/p>\n<p><b>Technical Support<\/b><br \/>\n<span style=\"font-weight: 400\">Experts in electronic invoicing, OCR, and financial workflows.<\/span><br \/>\n<span style=\"font-weight: 400\">Standard support, without as much specialization.<\/span><\/p>\n<\/table>\n<p><span style=\"font-weight: 400\">Therefore, easyap is ideal for:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Medium or large companies with high volume.<\/b><span style=\"font-weight: 400\"> Ensures traceability, internal control, and regulatory compliance.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Environments with <\/b><a href=\"https:\/\/www.easyap.com\/en\/blog\/que-es-un-erp-para-que-sirve-y-como-easyap-se-integra-con-el\/\"><b>Corporate ERPs<\/b><\/a><b>.<\/b><span style=\"font-weight: 400\"> The solution is perfect if you want advanced integration with SAP, Oracle, Dynamics, or the ERP you use.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Organizations with international operations.<\/b><span style=\"font-weight: 400\"> The platform manages different foreign formats and regulations, which is vital for multinational companies.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Financial departments with frequent audits.<\/b><span style=\"font-weight: 400\"> Automation and digital records facilitate any internal or external control.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">However, for very small SMEs or freelancers who issue few invoices per month, a lighter tool might be sufficient.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">Advantages of numbering invoices with easyap<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Both for operational and legal reasons, in the day-to-day of a <\/span><a href=\"https:\/\/www.easyap.com\/blog\/area-financiera-de-una-empresa-digitalizacion\/\"><b>financial department or area,<\/b><\/a><span style=\"font-weight: 400\"> numbering invoices is critical. An error can lead to redoing work, facing penalties, delaying audits, or undermining customer trust. <\/span><\/p>\n<p><span style=\"font-weight: 400\">That&#8217;s why more and more companies rely on systems like <\/span><b>easyap, which combines automation, security, and legal compliance.<\/b><span style=\"font-weight: 400\"> Among the advantages you can leverage with our software, you will find:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Total automation.<\/b><span style=\"font-weight: 400\">Invoices are numbered automatically, without duplicates or gaps.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Regulatory compliance.<\/b><span style=\"font-weight: 400\">We comply with Spanish invoicing regulations and other international standards.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Flexible configuration.<\/b><span style=\"font-weight: 400\">You can create multiple series and sub-series by year, branch, client, or operation, without inconsistencies.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Scalability.<\/b><span style=\"font-weight: 400\">It doesn&#8217;t matter if you manage 500 or 500,000 invoices per month, as the system handles immense data volumes without losing an ounce of efficiency.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Traceability and simplified auditing.<\/b><span style=\"font-weight: 400\">Each invoice is registered with a unique number and is easily accessible for inspections or reviews.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Time and cost savings.<\/b><span style=\"font-weight: 400\">The financial team can focus on higher value-added tasks, instead of manually reviewing invoicing sequences.<\/span><\/li>\n<li style=\"font-weight: 400\" aria-level=\"1\"><b>Expert support.<\/b><span style=\"font-weight: 400\">At easyap, we have specialists in e-invoicing and legal compliance who support you with every update.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">In summary, knowing <\/span><b>how to correctly number invoices<\/b> <b>provides you with order, legal compliance, and efficiency.<\/b><span style=\"font-weight: 400\">In large companies, the risk of invoicing errors multiplies. This is where easyap makes a difference: it integrates numbering into an automated, reliable, approved, and adaptable system. Want to see it? <\/span><a href=\"https:\/\/www.easyap.com\/en\/contacto\/\"><b>Contact us<\/b><\/a><span style=\"font-weight: 400\"> and enjoy efficiency, traceability, and control when managing your invoices.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Invoice numbering is a \u201cthree-in-one\u201d: a legal requirement, an internal control mechanism, and an indispensable practice for a business&#8217;s financial traceability. Incorrectly numbering invoices can lead to penalties from the Tax Agency, accounting errors, and audit complications. In these lines, we explain how to number invoices, what the regulation in Spain requires and when it [&hellip;]<\/p>\n","protected":false},"author":22,"featured_media":252628,"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-255806","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>How to correctly number invoices - easyap<\/title>\n<meta name=\"description\" content=\"We explain step-by-step how to correctly number invoices according to the Regulation and avoid errors and fines. 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