04 · Free toolFiscal authority: Govern d'Andorra — Departament de Tributs i de Fronteres
NRT format checker
Paste an NRT and see if it has the correct form and what type of taxpayer its initial letter indicates.
It works in your browser. We don't save anything and you don't need to register.
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How it works
It checks that the number follows the format of one letter, six digits and a check letter, then normalises hyphens and spaces. The initial letter indicates the relevant taxpayer category.
When it helps
- To validate the format of an NRT received by email before adding it to an invoice.
- To detect the most common error: a Spanish NIF pasted into the NRT field because they are similar enough.
- To understand what the initial letter means and what type of taxpayer it identifies.
When it's not enough
- It checks the format, not whether the number exists. A well-formed NRT may belong to nobody; actual verification must be made with the tax authority.
- It checks one NRT at a time. If you manage a client portfolio, the format should be validated when each record is saved so you never need to revisit it.
What it does not do
It checks the format and nothing else. It doesn't tell you if the number exists, if it's registered or if the company is active: for that you have to consult the official sources. A well-formed NRT may not correspond to anyone.
What if you never had to do it by hand again?
In AndCompta, a customer’s NRT is saved once and never needs to be entered again.