Why this matters
An invalid or missing VAT number means tax may be applied to your invoice when it shouldn't be
EU businesses trading across borders need to confirm a client is VAT-registered to apply the correct tax treatment
How to check a client's VAT number
Billdu does not have a built-in EU VAT validation tool. You can verify any EU VAT number for free using VIES - the official EU VAT validation database:
Find your client's VAT number in their Billdu profile (go to Clients → open the client → Edit)
Copy the VAT number
Open VIES
Paste the number and run the check
If valid, the client is confirmed as a VAT-registered business in the EU
Update a client's VAT number in Billdu
If the VAT number is wrong or missing after your check:
Go to Clients and open the client
Select Edit
Update the VAT or company ID field
Tap or click Save
Note: The ID fields shown for each client update automatically based on their country - for example, EU clients show a VAT number field, UK clients show a Company Registration No., and US clients show a Tax Registration No.
Didn't find what you were looking for? Contact our support team and we'll sort it out for you.