Most first-time applicants have never negotiated an indirect cost rate with anyone, and the budget form asks for one anyway. There are three realistic paths, and which ones are open to you depends on whether your award is a grant or a contract. Picking the simple path is a defensible choice; picking a number out of the air is not.
The de minimis rate
Uniform Guidance allows an organization that has never held a negotiated rate to charge a de minimis indirect rate, applied to modified total direct cost, without negotiating anything or documenting its actual overhead. You elect it, you say so in the justification, and you move on.
The percentage has been revised, so take it from the current Uniform Guidance text rather than from an older proposal or a template you found online, and confirm with your accountant that you are still eligible to elect it. The important caveat is scope: de minimis is a grant-side mechanism under Uniform Guidance. Agencies that fund SBIR through contracts rather than grants operate under a different framework, and the de minimis option may simply not be on the table there.
Negotiating a real rate
The alternative is a negotiated indirect cost rate agreement with a cognizant federal agency — typically the agency that funds most of your federal work, which for a small business is often not the one you are currently applying to. You submit a rate proposal built from your actual accounting records: your pool of indirect costs, your chosen base, and the resulting percentage, supported by financial statements and your written cost policy. The agency reviews it and issues an agreement that other agencies then honor.
The trade-off is straightforward. A negotiated rate is usually higher than the de minimis default, sometimes substantially, and on a Phase II budget the difference is real money that funds the administrative side of your company. The cost is time, an accounting system that can separate direct from indirect cleanly, an accountant who has done this before, and an ongoing obligation to true the rate up. For a company doing one small Phase I award, that effort rarely pays. For a company expecting a stream of federal work, it usually does — and the calculation is one worth running before you commit to a strategy of funding development through grants rather than equity.
Contract agencies work differently
Where SBIR is awarded as a contract, the Federal Acquisition Regulation governs and the expectations rise. You may be asked to propose provisional rates, to have an accounting system judged adequate, or to deal with a government audit agency. The vocabulary changes too: you may be quoting an overhead rate and a separate general and administrative rate rather than a single indirect number. None of that is a reason to avoid contract agencies, but it is a reason to ask your program contact what is expected before you build the budget, since the agencies differ more than the program name suggests. Rate questions are also a legitimate thing to raise when talking to a program manager before you apply.
Whichever path you take, use the same rate and the same base everywhere in the application, and state both in the justification so nobody has to reverse-engineer your arithmetic. Inconsistency there is a familiar entry among the budget mistakes that sink applications.
This is general information, not accounting or tax advice — your CPA should confirm which option applies to your company.
Projects House handles the engineering scope behind federal proposals for hardware companies. Get in touch through the contact form.