If UID numbers have been inserted after the invoice was created and the verification of your UID was successful, the future invoices will be issued tax-free. Unfortunately we have no possibility to check the VAT retroactively. Therefore we ask you to send us a confirmation that you already had a valid UID in the previous year (notification of the issuing of the VAT ID).

Learn how to insert the VAT number here
You can send the confirmation that you already had a valid UID to support@yumpu.com

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