Good fit: few invoices
AEAT targets the application at taxpayers issuing a small number of invoices or using relatively simple processes.
Kairoseth/Kairoseth Fiscal/VeriFactu/Free VeriFactu: the official AEAT application, free software intent, and when it fits.
FREE VERIFACTU · AEATUpdated 2026 guide
Free VeriFactu: the official AEAT application, free software intent, and when it fits.
There is an official free option. Spain's Tax Agency provides a basic invoicing application for issuing invoices and submitting VERI*FACTU records through its electronic office. When someone searches for free VeriFactu software, it helps to distinguish that public application from commercial tools and first check whether the official workflow covers the real operation.
For a self-employed professional or small business with few invoices and a simple process, it may be sufficient. When invoices originate in ecommerce, ERP, POS, SaaS or automated workflows, compare the operational cost of manual data entry with adapting the existing system.
VERIFACTU GUIDE
When AEAT's free application may be enough and when to compare alternatives.
The best option is the one that solves the complete workflow with the least risk and repetitive work, not necessarily the one with the most features.
Good fit: manageable manual work
If entering and reviewing each invoice in the electronic office does not create meaningful duplication, the public option may avoid another paid system.
Check invoice limitations
AEAT's general information says the free app handles full invoices and does not support multiple recipients.
Ecommerce or ERP: compare duplicate data entry
If order, customer, tax and payment data already exist elsewhere, entering them again manually can add time and errors.
Automation: evaluate the process, not only price
Refunds, series, multiple channels, imports, reconciliation and volume may justify integration with the source system.
Production and testing are different
AEAT warns that the production application creates real invoices; a separate external environment exists for testing.
STEP BY STEP
How to decide without buying or migrating too early.
First test whether the free workflow covers your real needs.
Count invoices and exceptions
Do not look only at average volume: include refunds, corrections, series and special cases.
Find where the data already lives
If everything is already in ERP, ecommerce or POS, calculate how much information would need to be entered again manually.
Compare the free workflow
Review AEAT's guide and check whether its invoice types and workflow cover your operation.
Integrate only when it adds value
If manual work or limitations are material, adapt the existing system before considering a full migration.
FREE DOES NOT MEAN INFERIOR
If AEAT's application covers your workflow, it may be the right option.
Kairoseth Fiscal makes sense when you need to integrate data and processes already living in another tool. An integration should not be recommended when the official free workflow already solves the problem well.
FAQ
Frequently asked questions.
Short answers grounded in official sources.
Is there a free VeriFactu application from Spain's Tax Agency?
Yes. AEAT provides a free invoicing application through its electronic office. It can issue invoices and submit invoicing records in VERI*FACTU mode.
Is VeriFactu free?
VERI*FACTU is not a single commercial software product; it is a mode within Spain's invoicing-system framework. AEAT does provide an official free application. Other software and integrations may be free or paid depending on provider and scope.
Do I need to download a free VeriFactu program?
AEAT's official free application is used through its electronic office. You do not need to install a local Tax Agency application to issue invoices through that service. After an invoice is issued, the application can download its PDF.
Who is the free application designed for?
AEAT describes it as particularly suitable for self-employed professionals and businesses issuing a relatively small number of invoices or using a simple invoicing process.
Does it have limitations?
Yes. AEAT's general information says, among other points, that full customer identification is required, only full invoices are supported, and invoices with multiple recipients are not supported. Check the official guide because capabilities can evolve.
Does using the free app mean replacing my ERP, ecommerce system or spreadsheet?
Not necessarily. The right choice depends on where invoicing starts today, volume, automation, integrations, series, refunds and reconciliation needs. The public app may fit a simple flow, while integrated processes may be better served by adapting the existing system.
Can I test it without issuing real invoices?
AEAT's help distinguishes the production application, where issued invoices are real and have tax effects, from an external test portal intended for testing without real effects.
KEEP EXPLORING
Canonical VeriFactu guides.
Each guide owns a distinct intent to avoid duplication and make the path from question to solution clear.
What is VeriFactu
Open guide →Requirements
Open guide →QR VeriFactu
Open guide →Self-employed and SMEs
Open guide →Current 2027 dates
Open guide →2028 announcement and horizon
Open guide →OFFICIAL SOURCES
Always check the current official version.
This guide summarizes official rules and documentation; it does not replace tax advice or checking the exact scope that applies to each organization.
AEAT · Free VERI*FACTU application guide
Open official source →AEAT · General information and application limitations
Open official source →AEAT · Invoice issuance help
Open official source →TRUST & CONTROL
Authority stays explicit as the platform grows.
Kairoseth separates identity, organization scope, product roles and product capabilities. A login route, browser state or AI response never becomes an authorization boundary by itself.
KAIROSETH PLATFORMCONTROL PLANE
- Identity
- Shared account
- Verified
- Organization
- Tenant scope
- Required
- Product
- RBAC assignment
- Explicit
- Sensitive actions
- Policy gate
- Controlled
Organization scope
Customer resources and access are resolved inside an active organization context rather than treated as global account state.
Product-scoped roles
Owner, Admin and Member authority is assigned per product. Organization membership alone does not automatically grant every product.
Server authority
Sensitive access, policy and capability decisions remain authoritative on the server instead of trusting client UI state or model output.
Controlled execution
Capabilities that can act are introduced behind explicit grants, staged gates and audit rather than implied autonomy.
Public trust evidence
Review the customer-facing policies that define privacy, security reporting, acceptable use and the current legal operating framework.
SOFTWARE VERIFACTU
Does the free app fall short because you already invoice from another system?
Before migrating, Kairoseth Fiscal can assess whether your ERP, WooCommerce, PrestaShop, spreadsheet, POS or custom software can remain the source system.