How to Choose E-Invoicing Software in 2026: The Complete Guide
Choosing the e-invoicing software you will rely on for the next several years is not a minor decision. In 2026, with Royal Decree 238/2026 already published and VeriFactu approaching fast, picking the wrong tool could mean fines, technical incompatibilities, or a forced emergency migration at the worst possible moment.
This guide gives you the 10 criteria that truly matter, the red flags you must avoid, and the exact questions to ask any vendor before you sign anything.
Why 2026 Is the Turning Point
Until recently, "electronic invoicing" in Spain essentially meant sending a PDF by email. That era is over.
Royal Decree 238/2026, implementing the Ley Crea y Crece (Create and Grow Act), establishes the obligation to issue and receive electronic invoices in structured format (Facturae, UBL or CII) in all B2B transactions —between companies and self-employed professionals— when the recipient has their registered office, permanent establishment, or habitual residence in Spain.
The deadlines are clear:
- 12 months from the entry into force of the Ministerial Order → companies with turnover above 8 million euros.
- 24 months → all other businesses and self-employed.
- 36 months → self-employed and income attribution entities with turnover at or below 8 million euros.
On top of this comes VeriFactu (RD 1007/2023 and Order HAC/1177/2024), the AEAT invoicing registration system that is expected to enter into force on 1 January 2027 for companies. VeriFactu requires that each invoice generate a record with an electronic signature and a hash chained to the previous record, sent or sendable to the AEAT in real time.
Two different regulations, two overlapping obligations on the same timeline. You need software that covers both.
The 10 Essential Criteria for Choosing Well
1. Compliance with RD 1007/2023 and Order HAC/1177/2024
This is the starting point. The software must fully implement the VeriFactu Regulation: generation of invoicing records with all mandatory fields, record chaining via SHA-256 hash, and the ability to send records to the AEAT system (VeriFactu mode) or securely retain them within the taxpayer's own system (Non-VeriFactu mode).
Ask directly: which version of the AEAT XSD schema does the software implement? Is it current with the latest official publication?
2. AEAT Certification: the Responsible Declaration
The AEAT does not proactively certify software, but it does require developers to submit a Responsible Declaration (Declaración Responsable) confirming their system complies with the Regulation. Without this document, the vendor cannot legally claim their software is compliant.
Ask to see the Responsible Declaration submitted to the AEAT. If the vendor does not have it or does not know what you are talking about, that is a major red flag.
3. Both VeriFactu and Non-VeriFactu Modes Supported
There are two compliance modalities:
- VeriFactu mode: each invoicing record is sent to the AEAT at the moment of generation. The AEAT acts as repository and the system adds the official QR code to the invoice.
- Non-VeriFactu mode: records are retained within the taxpayer's own system with the same technical guarantees (chained hash, signature), but without automatic transmission to the AEAT — although they must be available upon request.
Your software must support both modes and allow you to switch between them if your circumstances change. Some vendors only implement one; that limits your future flexibility.
4. Electronic Signature and Chained Hash
This is the technical core of VeriFactu. Each invoicing record must include:
- A hash of the record itself (SHA-256).
- The hash of the previous record, creating an unalterable chain.
- An electronic signature from the issuer or from the software on behalf of the issuer.
This ensures no record can be modified without breaking the chain. Verify that the software implements this chaining automatically and that the electronic signature is valid with certificates recognised by the AEAT.
5. Export to AEAT Formats (Pre303 and VAT Registers)
Good invoicing software does not operate in isolation. It must be able to export data in the formats your accountant or the AEAT requires: the Pre303 file for VAT settlement, the VAT Invoice Register (Libro Registro de Facturas Expedidas y Recibidas), and SII submission files if you are a large company.
If every quarter you have to manually type data into the AEAT portal because your software cannot export correctly, you are wasting time and taking on avoidable risk.
6. Multilingual Support for Foreign Clients
RD 238/2026 activates the obligation when the recipient has their registered office or establishment in Spain. But if you also invoice clients in Germany, France or other EU countries, you need software that generates invoices in multiple languages without compromising the required technical structure.
The content changes language; the structured format (UBL, CII or Facturae) does not. Your software must correctly separate both layers.
7. Recipient Portal (RD 238/2026)
Article 9 of RD 238/2026 requires the issuer to provide the recipient with a portal or access point where they can view, download and manage the status of received invoices. This is not optional: the recipient has the right to access their invoices in structured format even if they have no software of their own.
Verify that your vendor includes this portal in their offering. Some charge for it as an add-on module; others include it as standard. It is a legal requirement, not an extra.
8. Accounting Integration
Electronic invoicing is, first and foremost, an accounting document. The EC-CGE Position Paper No. 3/2026 emphasises this: the electronic invoice becomes the "primary supporting document for accounting records" and must be integrated into the accounting workflow from the outset, not bolted on as an afterthought.
Your software must connect with your accounting application — via API, direct export or native connector — so that accounting entries draw from electronic invoice data without manual double entry.
9. Scalability and Volume Pricing
A freelancer issuing 50 invoices per month has very different needs from a company issuing 5,000. Analyse the pricing model:
- Is billing per invoice issued or per flat plan?
- What happens when you exceed the plan limit?
- Is there an additional cost for receiving electronic invoices from suppliers?
- Does the price include interconnection with other private platforms as required by RD 238/2026?
RD 238/2026 requires private platforms to interconnect with each other within a maximum of one month from request. That has a technical cost; make sure it is not passed on to you as a surprise.
10. Spanish-Language Support and Up-to-Date Documentation
Spanish regulations are complex and change frequently. You need a vendor who:
- Offers support in Spanish, not only in English.
- Updates their documentation every time the AEAT publishes new technical specifications.
- Has a direct channel for regulatory compliance questions, not just technical support tickets.
Check when their VeriFactu knowledge base was last updated. If the documentation is more than six months old, the team is not following regulatory developments with the agility required.
Red Flags: Software You Should NOT Buy
Certain situations should trigger immediate alarm:
The vendor does not know the difference between B2B e-invoicing and VeriFactu. These are two distinct obligations with different regulatory frameworks. Confusing them signals a lack of domain expertise.
No Responsible Declaration submitted to the AEAT. Without this document, their compliance claim has no legal backing.
PDF only. A PDF, however well-named or digitally signed, is not an electronic invoice under RD 238/2026. The invoice must be in structured format (Facturae, UBL or CII).
No public roadmap for RD 238/2026. If they cannot show you which features are being developed and by when, you are assuming the risk that they will be late.
Abnormally low price with no explanation. Proper VeriFactu implementation has a real technical cost. If the price is significantly below market rate, ask which features are missing.
Support by email only with a 72-hour SLA. When there is a billing problem in production, 72 hours is an eternity.
Key Questions to Ask Any Vendor
Before contracting any e-invoicing software in 2026, ask these questions and demand specific answers:
- Have you submitted the Responsible Declaration to the AEAT? Can you share the acknowledgement?
- Which version of the VeriFactu XSD schema do you currently implement?
- Do you support both VeriFactu mode and Non-VeriFactu mode?
- How do you handle electronic credit notes within the hash chain?
- Is the recipient portal required by RD 238/2026 included in the base price or is it an add-on?
- Which structured formats do you generate: Facturae, UBL, CII?
- How does your platform interconnect with other private platforms?
- What is the maximum transmission time for records to the AEAT in VeriFactu mode?
- Do you export to Pre303 format and VAT invoice registers?
- What is your update plan when the AEAT publishes new technical specifications?
If the vendor cannot answer more than three of these questions precisely, keep looking.
Frequently Asked Questions
What is the difference between B2B e-invoicing and VeriFactu? B2B e-invoicing (RD 238/2026) regulates the commercial exchange of invoices between businesses and self-employed professionals in structured format. VeriFactu (RD 1007/2023) is an AEAT tax control system that requires invoicing software to generate records with a signature and chained hash for each invoice issued. They are distinct obligations that coexist: one affects the format of the invoice you send to your client; the other affects the internal record your software generates and that must be available to the AEAT.
Does a digitally signed PDF comply with RD 238/2026? No. RD 238/2026 requires structured formats (Facturae, UBL or CII) that enable automatic data processing. A PDF, even if digitally signed, is not a structured format and does not satisfy the B2B e-invoicing obligation.
When does the obligation take effect for freelancers with turnover below 8 million euros? The deadline is 24 months from the entry into force of the Ministerial Order developing the public invoicing solution. For self-employed and income attribution entities with turnover at or below 8 million euros, the deadline extends to 36 months. The Ministerial Order has not yet entered into force; the Ministry of Finance submitted the draft for public consultation in April 2026.
What is the recipient portal and why does it matter? It is the access point the issuer must provide to the recipient so they can view, download and manage their received electronic invoices, even if they have no software of their own. Article 9 of RD 238/2026 requires it expressly. If your software does not include it, you will need to contract an additional module or change provider.
Does InvoSeal meet all 10 criteria? Yes. InvoSeal implements full VeriFactu (VeriFactu and Non-VeriFactu modes), generates invoices in Facturae, UBL and CII, includes the recipient portal, exports to Pre303 format, offers a multilingual interface and provides Spanish-language support with up-to-date documentation. You can verify this in our technical documentation or try it directly.
InvoSeal Meets All 10 Criteria — Try It Free
You do not have to take our word for it. InvoSeal is built from day one to comply with Spanish e-invoicing regulations: VeriFactu, RD 238/2026, and whatever comes next.
See for yourself: issue your first compliant electronic invoice, verify the hash chain, download the Facturae file and check that the recipient portal is ready for your clients.
Start free today. No credit card. No hidden terms.