US Sales Tax handling for non-US Shopify Stores now implemented

The Shopify Mobile App is considered a marketplace and as such Shopify is required to collect US Sales Tax for any US orders placed using the App, even if your store is not based in the US and does not have tax nexus anywhere in the US.

You may also have tax nexus in one or more regions in the US and be required to collect Sales Tax via your online store.

As accounting systems are primarily designed to account for domestic Sales Tax/GST/VAT/etc, the best solution in such cases is to record the foreign US Sales Tax on a separate invoice line without any domestic tax applied.

Before you proceed to your integration's Configuration Panel, you will probably first want to create a Current Liability account in your Accounting App for the US Sales Tax lines. To do this...

In Xero: click Accounting > Chart of Accounts (in the "Advanced" section) > Add Account; select "Current Liability" for the account type and fill in the rest of the details for the account;

In QuickBooks Online: ⚙ > Chart of accounts  > New > Create a new account of type "Current liability" for the foreign tax

On to the integration's Configuration Panel... You will find the option "If you have US orders with US Sales Tax, include the Sales Tax as a separate invoice line?" towards the top of page 1. Once enabled, please also check towards the bottom of the page for the options to select the current liability account (nominal code) and the "zero" tax rate to be used for the US Sales Tax lines.