Reverse-Charge Validator

Under the reverse-charge mechanism the liability flips: it is not the supplying business that remits the VAT, but the recipient. That sounds technical, but it is the norm for cross-border B2B services and for certain domestic transactions like construction work. Forget the mandatory notice or apply the mechanism wrongly and you risk back-tax demands and trouble with the input-tax deduction.

The validator works as a wizard. You pick the type of service, state where the supplying business is based - domestic, another EU country or a third country -, whether your counterpart is a business (B2B) or a private customer (B2C), and optionally enter the VAT ID and the invoice amount. From that combination the tool determines whether and which Section 13b case applies.

In total the validator knows all eleven case groups of Section 13b: services from other EU states (para. 1), work supplies and services from third countries (para. 2 No. 1), goods assigned as security, real-estate transactions with an option to tax, construction services, building cleaning, scrap and waste metal, gold, mobile devices and further special cases. For each case it states the prerequisites in plain language.

A central building block is the VAT ID check. The validator knows the prefixes and format patterns of all EU countries and checks whether an entered number is syntactically correct. For intra-community services the recipient's valid VAT ID is a prerequisite for reverse charge to apply at all - if it is missing, the assessment flips.

If a case fits, the tool supplies the correct invoice notice - for example "Steuerschuldnerschaft des Leistungsempfängers" or "Reverse Charge per Section 13b para. 1 UStG". This wording is a mandatory element under Section 14a; without it the invoice is formally defective. You can take the notice straight over.

For bookkeeping the validator names the matching accounts in SKR03 and SKR04 for each case, with debit and credit sides for the Section 13b service and the input tax. That way you book the transaction neutrally, without output and input VAT drifting apart. It also flags the reporting duty in the recapitulative statement where relevant.

The reverse-charge validator is a checking and learning tool, not tax advice and not an official VAT ID confirmation. You obtain the qualified confirmation of a VAT ID from the BZSt, and the binding assessment of your individual case from your tax advisor.