A VAT return is a declaration of taxable transactions within a particular taxable period, which is either monthly, quarterly, or annually. Reference: https://vatstudio.com/Blog/vat-return-services/

Now that your business is VAT registered, you need to keep compliant with EU VAT regulations. Starting 1 July 2021, all businesses dealing with EU customers will have an option to use the OSS or the IOSS [link to OSS/IOSS article] for EU VAT compliance. Reference: https://vatstudio.com/Blog/vat-compliance-services/