Providing your IOSS number to Shipstation ensures your shipments are handled appropriately.
Add Tax ID Numbers to International Settings
To add your Tax ID numbers to yourShipStationaccount:
1. Go toAccount Settings.
2. Select Shipping and then choose International Settings from the left-hand sidebar.
3. Click the Add a Tax Identifier button.
4. Select the Tax ID type and Issuing Authority, then enter the ID number and give it a nickname (the nickname helps you identify the ID when selecting it for your shipments).
Available Tax ID Types:
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TIN
TIN is a generic "Tax ID Number". Use this option if your Tax ID type is otherwise not provided in the list.
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VOEC (Norway)
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PAN (India)
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EIN
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SSN
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VAT
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EORI
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IOSS
6. Click+ Add Another Tax Identifier to add additional Tax ID numbers.
Repeat until you have added all necessary Tax ID numbers toShipStation.
ShipStation will display a list of the Tax Identifiers that have been added. The Tax ID details cannot be modified once added. If you need to make a change to an entry, you must delete the entry and add a new one.
Link to original article:
https://help.shipstation.com/hc/en-us/articles/360035991611-ShipStation-s-International-Settings