NSF SBIR
How to build an NSF SBIR Phase I budget reviewers believe
Direct costs, fringe, indirect rates, subawards and consultants. What a credible Phase I budget looks like and the line items that trigger questions.
The budget is a technical document
Founders often treat the budget as an administrative afterthought completed the night before submission. Reviewers and program directors read it as evidence of whether you understand the work you have proposed.
If the technical plan describes six months of device fabrication and the budget funds a quarter of an engineer, the mismatch is obvious and it undermines everything above it.
Where the money usually goes
Personnel is normally the largest line. The principal investigator must be primarily employed by the small business at the time of award, and their committed effort should be visible in the budget rather than nominal.
Materials, fabrication, testing and prototype costs come next, then travel to the required program events. Equipment purchases are treated cautiously in Phase I; renting time or using a facility is usually easier to justify than buying capital assets.
Subawards, consultants and the work share rule
A share of the research must be performed by your own company, with the remainder available for subawards to universities, national labs or contract research organizations. Get the split right before you negotiate with a partner, not after.
Consultants are billed at a daily rate and need a letter confirming availability and rate. Named experts with a defined role are persuasive; a long list of advisors with no budgeted time is not.
Indirect costs and the questions they raise
Most first-time applicants have no negotiated indirect cost rate and use the de minimis rate on modified total direct costs. That is normal and expected, and it is far safer than inventing a rate you cannot defend.
Every unusual line item needs a sentence of justification that ties back to a technical objective. If a reviewer has to guess why a cost exists, it will read as padding.
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