When importing your orders, you may want to import tax information. Shopify has three fields you can populate when sending tax information with your Order.

1. tax_included (on the Order Details tab): This field states whether the Order's subtotal includes taxes. Valid values are True or False. This field defaults to False.
2. total_tax (on the Order Details tab): This field is the sum of all taxes applied to the Order (must be positive). It is the total tax for the Order, not the line item.
3. Taxable (on the Line Items tab): This field states whether the product was taxable. Valid values are True or False.

When getting started, the easiest thing to do is map the column in your CSV file with your tax values to the total_tax field on the Order Details tab. Also, ensure your line_item.price does not include the tax value. If your price includes the taxes, you'll need to set tax_included to True.

Once you have mapped your tax fields, you can run your import. After importing your Order, the tax field will be displayed and calculated on the Orders page in the Shopify Admin.

As you can see, the Order's subtotal includes taxes(remember the tax is on the Order, not the line item). You can read more here to understand how Shopify calculates the Total.

That's all you need to import taxes with your Order.