Once you've added tax to a storage warehouse, every storage account associated with that warehouse will be taxed at the specified rate. However, you can exempt single accounts from sales taxes.

Navigate to Storage -> Accounts (or click here to go directly to the page), and select an account.

First, click the Storage Rates tab.

Then, click the Tax Rate drop-down list and select Exempt.

Once updated, any invoice generated after the change was made for the single warehouse account will not be taxed.