From the PREFERENCES screen, click on INTERNATIONAL OPTIONS.

Some countries allow you to prepay all Taxes and Duties via a Tax ID registration. For example, if you ship to the EU, you may be registered with the IOSS to save money on VAT charges. Likewise, if you are registered for UK Vat, you can enter your ID here.
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SellerDash allows you to store these numbers here to use for any applicable orders.

As Zonos is the mandated option for shipments to the US, it does not appear in this section.

Note: only ZONOS is supported for Canada, so if you wish to prepay landed costs via your connected Zonos account, enter the word ZONOS in the field provided for Canada GST.