The EC sales report shows the net (excluding tax) value of all sales for a chosen tax code between two dates, grouped by customer.
It's intended for UK merchants submitting an EC sales list (no longer a requirement), but can be used by anyone wanting similar data.
The customer's tax number is also shown.
If customers with sales matching the tax code have no tax number, then the value will be grouped into a row marked "N - no tax number".
View the EC Sales Report at Reports > Accounts reports: More... > EC Sales.