6.25 A clear picture of the revenue payments (i.e. unitary payments) will be required for each bid, including the profile of the payments over time. This must describe the nature of the payments to be made by NHSScotland, when payments will be made and how much will be paid. Payment mechanisms are discussed further in Chapter 5 of Section 3 of the guidance on Technical & Commercial Issues. NHS bodies should be clear on the funding, interest rate and indexation assumptions in each bid on which costs are based.