If you need to support a tax system other than that used in the US, the Tax Name and Tax ID options are for you. Tax Name is what you call the tax in the system you’re using — “sales tax,” “VAT,” “because-I-feel-like-it tax,” etc. Tax ID is the number that identifies you to the government body collecting those taxes. If you don’t know whether you need one, it’s probably okay to leave it blank.
(Note: Blinksale, Inc. will not be responsible for you getting thrown in debtor’s prison. But if that happens, write us and we’ll see about comping your account.)
Hit the Save Settings button at the bottom of the page when you’re done.