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15 step-by-step guides and 4 articles on VeriFactu, transport documents (DeCA), Spanish tax returns and how to bring your data from another program.

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Article · 5 min · Oct 2026

VeriFactu digital certificate: which one and how to get it

VeriFactu and AEAT
Guide · ≈ 12 min · Oct 2026

How to prepare a digital DeCA in 2026, step by step

Transport and DeCA
Guide · ≈ 10 min · Oct 2026

How to get ready for eFTI in 2027: guide

Transport and DeCA
Guide · Sept 2026

How to correct an issued DeCA and keep its versions

Transport and DeCA
Guide · Sept 2026

How to export data through the Holded API

Migration
Guide · Sept 2026

How to manage a transport job through to its invoice

Transport and DeCA
Guide · Sept 2026

How to migrate from Holded to Cofactu, step by step

Migration
Guide · ≈ 6 min · Sept 2026

How to digitise invoices and what the AEAT requires

VeriFactu and AEAT
Guide · ≈ 9 min · Sept 2026

DeCA vs CMR vs e-CMR: differences explained (2026)

Transport and DeCA
Guide · ≈ 8 min · Aug 2026

How to issue your first VeriFactu invoice (step by step)

First steps
Guide · ≈ 6 min · Aug 2026

What hardware you need for the POS (requirements and kits)

First steps
Guide · ≈ 6 min · Aug 2026

Upload your digital certificate to Cofactu, step by step

VeriFactu and AEAT
Article · 4 min · Jul 2026

VeriFactu deadlines 2027: when do you have to comply?

VeriFactu and AEAT
Guide · ≈ 15 min · Jul 2026

How to authorise your accountant at the AEAT (step by step)

VeriFactu and AEAT
Guide · ≈ 10 min · Jul 2026

How to read an AEAT rejection in VeriFactu

VeriFactu and AEAT
Guide · ≈ 15 min · Jul 2026

How to file the Modelo 303 VAT return (step by step)

Tax
Guide · ≈ 30 min + acreditación · Jul 2026

How to request the FNMT digital certificate (Spain)

VeriFactu and AEAT
Article · 6 min · May 2026

What is VeriFactu? Spain's verifiable invoicing system

VeriFactu and AEAT
Article · 8 min · May 2026

VeriFactu for accounting firms: managing hundreds of clients

Accounting firms
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