To determine your new C2 budget, which begins with FY21 and can be spent any time between FY21 and FY25, go to the following:
https://sltools.universalservice.org/portal-external/budgetLookup/
Keep in mind that your C2 budget is the total amount of a project that USAC will support, and your discount for C2 resembles your C1 discount, except that a maximum of 85% discount for 90% C1 locations.
Imagine 2 school districts that both have $100,000 C2 budgets:
Ex: $100,000 project for School District X that has an 80% C1 discount
E-rate pays $80,000 and School District X pays $20,000 for this project
Ex: $100,000 project for School Distict Z that has a 90% C1 discount
Erate pays $85,000 of the project and School District Z pays $15,000