Company / Dealer / ID Number Checker
A wrong dealer number on an invoice is a headache with the Tax Authority and with the client. Enter a company number, dealer number or ID number, and instantly get an answer whether it is structurally valid or whether a typo slipped in.
* The check validates the structure of the number (the check digit per the Luhn method), in order to catch typos. It does not verify that the number is actually registered and active in the Companies Registrar or the Tax Authority — a full verification against the registrar requires an online lookup.
How does the check work?
- •Company, dealer and ID numbers are made of 9 digits, where the last one is a check digit.
- •The check digit is calculated using the Luhn method from the first eight digits.
- •If the digit doesn't match — there is a typo. The check catches it before the number ends up on an invoice.
Frequently asked questions
How do you check whether a company number is valid?
The number is made of 9 digits, and the last one is a check digit per the Luhn method. If it doesn't match the rest of the digits — there is a typo.
What is a check digit?
The last digit of the number, calculated from the previous eight. It immediately reveals a mistyped digit or a swapped digit order.
Does this confirm the dealer exists and is active?
No. The check validates structure only. A full verification that the number is registered and active requires an online lookup against the Companies Registrar.
Want all the client details to fill in correctly on their own?
With Quickly the client's name is enough — the system validates the dealer number and completes the details on the invoice. 14-day free trial.
Start free →