Budget at Completion is the budget for the sum total of all work on the project, or in other words, the Planned Value of all project work from start to finish.
There are two outputs of Determine Budget: Cost Baseline, and Project Funding Requirements.
The total budget, Budget at Completion, for a project will include the Cost Baseline, Contingency Reserve, and Management Reserve.
Funding Limit Reconciliation is a tool and technique that helps Determine Budget.
Cost Aggregation is a tool and technique of Determine Budget.
Project performance is monitored and controlled through the cost Baseline.
When the projected is completed, the Budget at Completion will equal the Planned Value.