...
Rates help you understand how much revenue you should put on the customer invoice on time and material projects. Rates are associated with the user’s charge-out rate. Even with fixed price projects, understanding the actual revenue the project should be making can help you define your future margins.
Setting up costs & rates
To set up the currency displayed in your reports:
...
The cost and/or rate defined here will be applied to all worklogs added for the given user. At the moment we do not support defining costs and rates for a certain period of time or different rates for different projects.
Reviewing costs and revenue from billable time
To view costs or rates on the timesheet report, open it and click on the Format selector (the second-last icon in the top bar on the right, usually showing HH:MM), like this:
...