I have a small business that has responded to a Broad Agency Announcement. They've performed some small work for the government under SBIR programs, but they've never established their indirect rates. The proposal came as FFP, but included "estimated" indirect costs of 10% and some separate costs for fringe. I suspect the owner/operator (a former professor) set it at 10% due to the allowance to do this under grants.
Since this is a BAA, how could I proceed to issue an award? Send in an auditor to establish what the indirect rates should actually be? Can I accept an obviously low rate? The proposed costs (labor, materials) otherwise seem to be supported by my research.