Feed editor - Tax

In this tab you define the tax settings at the feed level. If you want to set different tax rates for specific groups of products, use tax_category to apply a label to products, such as “perishable foods” or “clothing”.  If you submit this attribute, it can be used to amend the tax settings you’ve entered into your Merchant Center account for the states for which you have configured tax rates.

For US, you can add up to 100 tax entries to be used together with the account tax settings to help you provide accurate tax costs.