E-invoicing comes with a number of terms: from the invoice formats ZUGFeRD and XRechnung, to VAT categories, to special cases such as intra-community supply, the reverse charge procedure, or the VAT exemption for small businesses.
ZUGFeRD, XRechnung & Co.: E-Invoice Formats Explained
The differences between XRechnung and ZUGFeRD, EN 16931, PDF/A-3, and the business term / business group concept explained.
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VAT Categories S, Z, K, E & AE in E-Invoices Explained
Overview of the VAT categories S, Z, K, E, and AE used in XRechnung e-invoices and when each applies.
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Intra-Community Supply in E-Invoices
Legal background, requirements and VAT category K for intra-community supplies in e-invoices.
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Reverse Charge in E-Invoices Explained
Legal background, requirements and VAT category AE for reverse charge in e-invoices.
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VAT Exemption & Small Business Rule
The small business regulation (§19 UStG) and other VAT exemptions under §4 UStG using VAT category E in e-invoices.
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Validating E-Invoices with the KoSIT Validator
How the KoSIT validator checks e-invoices and what errors, warnings and notices mean.
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