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IOSS explainer and format check

Explain the EU IOSS VAT ID and check the IMxxxyyyyyyz format. This is not a registry lookup and is unrelated to Apple iOS.

IOSS VAT ID

About this tool

IOSS (Import One-Stop Shop) is the EU scheme for import VAT on low-value consignments. It is unrelated to Apple’s iOS. Under Commission Implementing Regulation (EU) 2020/194, an IOSS VAT identification number has the format IMxxxyyyyyyz: the IM prefix, a 3-digit ISO numeric country code, a 6-digit serial and a check digit. This page only checks that format and shows the member state. The check-digit algorithm is not public, so the page will not claim that the check digit is correct, and it does not query the official EU register. Register and file through the official portal at https://vat-one-stop-shop.ec.europa.eu/.

How the formula works

Valid format: positions 1–2 are IM, positions 3–5 are an EU member state’s ISO numeric code (for example Germany is 276), positions 6–11 are a serial, and position 12 is a check digit. This page checks the structure and member-state code only. It does not verify the check-digit algorithm or query an official database.

FAQ

Is this related to iOS?

No. IOSS stands for Import One-Stop Shop, an EU import VAT scheme. It has nothing to do with Apple iOS, and this page does not deal with Apple devices or software.

If the format check passes, is the number valid?

No. This page only says the string matches IMxxxyyyyyyz and that the country code is an EU member state. Real validity can only be confirmed through the official ImpOST / OSS channels or the competent authority.

Why is the last digit not verified?

The regulation requires a check digit, but a citable public algorithm is not available, so this page will not pretend to have verified it.

Feedback

Report formula, copy, or fee-rule issues. Do not send your prices or costs.

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