How do I edit or delete a tax rate I added?

Go to Settings → Store Settings → Manage Tax and find the rate in the table.

To edit it:

1. Click Edit on the row. The form at the top fills in and shows an Editing tag.
2. Correct the Rate, Name or location.
3. Click Update rate, or Cancel to leave it unchanged.

To remove it, click Delete on the row and confirm.

Changes apply to new checkouts straight away. Orders already placed keep the tax they were charged.