The Revenue by Service report will display the revenue from a specific service or services within specific months. You have the option to filter by year and service, in addition to filtering by 'Total Collected' and 'Total Billed'.  Total collected will be any payment received, whereas Total Billed will include invoices sent. After making any modifications to your filters, you will need to select the 'Update' button in the upper right corner for those changes to be reflected in your report. You also have the ability to export to a CSV Excel worksheet and Print your report.