Cost Performance Reports
You can include cost performance fields in reports, such as a cost register report.
Cost Register Report
If you use cost performance fields in a cost register report, the values for individual cost items will be summed to give overall values for the cost register as a whole. You can use a cost register, for example, to provide an overall cost performance index or an overall estimate to completion for your project as a whole.
Budget At Completion (BAC)
Cost performance fields normally use the base (mid-range) cost for the budget at completion. However, when designing a report you may optionally use the base+contingency ( high-range) cost, or the low-range cost.
If the values that you have for actual cost (AC) are inclusive of tax, then all other cost performance fields should also be inclusive of tax.