If you decide that your business needs to make use of the IOSS, in addition to getting an IOSS number (if you need one), you will need to consult with Metapack and other parties, and carry out some due diligence activities.
If you want your business to make use of the IOSS, you should consult any carriers you use to verify that they can support the IOSS. It is possible that some of your carriers have not yet completed making all the changes that they might need to make to ensure IOSS support.
Before making use of the IOSS, you should:
Audit the data used for your online sales to ensure that the product descriptions and harmonised codes are accurate.
Determine whether the prices of your products include or exclude VAT and make changes as appropriate to comply with IOSS requirements.