The R&D tax credit puts real cash back into a SaaS startup, an average of around $21,000 a year and up to $500,000 against payroll tax for pre-revenue companies, but the IRS put aggressive R&D credit mills on its Dirty Dozen list of common tax scams for a reason. Before you sign an engagement letter with an R&D tax credit firm, ask these six questions. They separate the specialists who protect you in an audit from the ones who inflate your claim and disappear when the IRS calls.
I've watched founders get quoted wildly different numbers for the exact same R&D spend by two different providers, then get spooked when the aggressive one turns out to be the one running the ad campaign. The provider matters as much as the credit itself. Here's what actually separates them.
How is your fee structured?
Most legitimate R&D tax credit firms charge either a flat fee or an hourly rate for the study. Some charge a percentage of the credit claimed, commonly 20 to 30 percent, and that structure alone isn't automatically disqualifying. What is a red flag is a percentage fee paired with a guarantee to defend the claim through audit at no extra cost.
IRS examiners are trained to ask for your engagement letter first, specifically to check for contingency language, because it correlates strongly with inflated claims. If a provider won't show you the fee terms in writing before you sign anything, that's your answer.
Can I see a sample study for a company like mine?
Ask for a redacted sample of an actual R&D study, not a sales deck. A real study documents the technical uncertainty your team faced and the process of experimentation used to resolve it, tied to specific projects and specific engineers.
A weak or fraudulent study reads like a list of job titles with the word research inserted, often copy-pasted from one employee's writeup to the next with the names swapped. If the sample looks like a form letter, the study they produce for you will too, and that's exactly what an examiner is trained to spot first.
What happens if I get audited, and who shows up?
Ask directly: if the IRS opens an inquiry, do you represent me, and is that included in the fee I'm already paying? A firm confident in its own work says yes without hesitation and names the person who'll handle it.
A firm that goes quiet or tries to sell you a separate audit defense package after the fact was never planning to stand behind the claim it sold you. Audit risk on aggressive R&D claims is real: the IRS can reopen years well beyond the standard three-year window, sometimes seven or more, when it suspects an overstated claim.
How do you document what my engineers actually did?
A good R&D tax credit study interviews your actual engineering leads, not just your finance team, and ties qualifying research expenses to specific features, experiments, or technical dead ends, not a blanket percentage of payroll.
If a provider proposes a number before ever talking to anyone who wrote code, they're estimating, not documenting. That gap is exactly what shows up as a weakness under audit.
Do you understand the 2025 rule change, and what it means for my filing?
In 2025, the OBBBA restored immediate expensing for domestic R&D costs under new Section 174A, replacing the five-year amortization rule that had been in place since 2022. That change increases the qualifying research expenses many SaaS companies can claim going forward, and it opened a retroactive window for small businesses to amend 2022 through 2024 returns, a window that closed July 6, 2026.
A provider still pitching that retroactive amendment as available today either isn't current on the law or is stalling you into a rushed engagement. Ask specifically how the change affects your current and next filing year, not just the years that already closed.
What to do this week
Get quotes from two or three R&D tax credit providers before signing with any of them. Ask all six questions above on every call, in the same order, and request the fee structure and a sample study in writing before you commit.
If a provider hedges on fee structure, can't produce a real sample, or pushes the expired retroactive window as urgent, move on. The credit is worth pursuing. The wrong provider is what turns it into an audit instead of cash back.
Frequently asked questions
Is the R&D tax credit worth it for a small SaaS startup?
Usually yes. Startups with under $5 million in gross receipts can apply up to $500,000 of the credit against payroll tax even before they're profitable, and most qualifying companies recover 6 to 10 percent of their qualifying research spend. For a startup spending heavily on engineering payroll, that adds up fast even at a modest team size.
How much does a legitimate R&D study cost?
Flat-fee providers typically charge a few thousand dollars for an early-stage startup's first study, scaling with engineering headcount and complexity. Treat quotes far below that as a sign the provider is doing a cursory job, not a bargain.
Can my regular CPA handle this instead of a specialized firm?
Some can, especially if they already have R&D credit experience, but many general practice CPAs refer this out because the documentation standard is different from normal tax prep. Ask your CPA directly whether they've filed Form 6765 and defended a claim under audit before deciding.
What's the IRS Dirty Dozen list, and why does it matter here?
It's the IRS's annual list of the most common tax scams and abusive schemes, and aggressive R&D credit claims have appeared on it in recent years. It doesn't mean the credit itself is suspect, it means the IRS is actively watching for providers who oversell it, which is exactly why the questions above matter before you sign.