R&D credit fee comparison
Contingency-Fee R&D Tax Credit Firms (25%) vs. Fixed-Fee PE-Led Form 6765 Studies: Cost & IRS Audit Risk
A contingency-fee R&D credit study commonly costs 20% to 30% of the credit; a fixed-fee study benchmarks at $8,500 plus $1,200 per business component, typically $12,000 to $28,000. On a $230,535 federal and state credit with eight projects, that is $57,634 at 25% against $18,100 fixed, a $39,534 difference. Below a credit of about $72,400 the contingency fee is cheaper, so the choice depends on size and on how well the study will hold up in an exam.
01The short answer: fee model follows credit size and audit exposure
R&D tax credit advisers are commonly paid one of two ways. Under a contingency fee, the adviser takes a percentage of the credit claimed, commonly 20% to 30%, with 25% a frequent figure. Under a fixed fee, the adviser charges a set price for the study, which our benchmark puts at $8,500 base plus $1,200 per business component (each product, process or project you claim), typically $12,000 to $28,000 in total.
Two things decide which is better for you:
- Credit size. Contingency fees scale with the credit; fixed fees scale with the work. Small credits often favor contingency; large ones almost always favor fixed fees.
- Defensibility. The IRS now asks for business-component detail on Form 6765, including Section G. A study built on project-level technical narratives and time records is easier to defend than one built on blanket payroll percentages, whatever the fee model.
Engineer Aid is independent and is not a tax firm. This page explains fee structures and the statutory mechanics so you can question any adviser's proposal; confirm treatment for your facts with your CPA or tax counsel.
02Worked example: building the credit for an engineering firm
Qualified research expenses (QREs) under IRC § 41 come from three main buckets: wages for staff performing, supervising or directly supporting qualified research (100%), supplies consumed in experimentation (100%), and 65% of payments to US contractors where you keep substantial rights and bear the economic risk. Foreign contractor spend counts as $0.
| Line | Spend | QRE rule | QRE |
|---|---|---|---|
| Qualified W-2 engineering wages | $1,800,000 | 100% | $1,800,000 |
| Prototype supplies consumed | $120,000 | 100% | $120,000 |
| US 1099 engineering contractors | $300,000 | 65% | $195,000 |
| Total QRE | $2,115,000 | ||
| Federal net credit at 7.9% | $167,085 | ||
| State credit at an assumed 3% effective | $63,450 | ||
| Total credit | $230,535 |
Fees on this credit: 25% contingency = $57,634. Fixed fee = $8,500 + (8 x $1,200) = $18,100. Difference: $39,534 for one tax year. A caution on the 7.9% benchmark: the Alternative Simplified Credit is 14% of QREs above half of the prior three-year average. A firm with flat QREs gets 14% x 50% = 7% gross, about 5.5% after the § 280C reduced-credit election (x 0.79). Growing firms land nearer 7.9%. Ask any adviser to show this step.
03Breakeven: when contingency is actually cheaper
The breakeven formula is Credit at breakeven = Fixed fee / Contingency rate. With eight business components, $18,100 / 0.25 = $72,400. Below that credit, a 25% contingency fee costs less in cash. Above it, every extra dollar of credit makes the fixed fee look better.
| Total credit | Contingency fee (25%) | Fixed fee | Fixed fee saves |
|---|---|---|---|
| $40,000 | $10,000 | $18,100 | -$8,100 (contingency cheaper) |
| $72,400 | $18,100 | $18,100 | $0 (breakeven) |
| $150,000 | $37,500 | $18,100 | $19,400 |
| $300,000 | $75,000 | $18,100 | $56,900 |
| $500,000 | $125,000 | $18,100 | $106,900 |
For a small first-year claimant with an uncertain credit, contingency can be a fair way to share risk. For a firm claiming the credit every year, the gap compounds: at a $300,000 credit, the difference over three years is about $170,700.
04Audit risk: what the fee model changes and what it does not
The fee model does not decide whether a claim survives an IRS exam; the documentation does. But incentives matter. A contingency adviser earns more when the credit is larger, which can push towards broad claims such as a flat percentage of all engineering payroll. Buyers report that claims built that way, without project-level evidence, are the ones most exposed when the IRS asks for business-component support.
What holds up, under either fee model:
- Business components. Each claimed product or process identified, with the technical uncertainty it addressed and the process of experimentation followed, matching the detail now requested on Form 6765 Section G.
- Contemporaneous records. Design iterations, test reports, change records and time allocations made during the year, not reconstructed later.
- Technical narratives written or reviewed by engineers who did the work, ideally with PE-level review for engineering claims.
- Wage allocations by person and project. If a person spends at least 80% of time on qualified activity, the substantially-all rule lets 100% of their wages count; below that, only the qualified share counts.
Ask every adviser whether audit defense is included in the fee, and for how many years.
05The funded-research trap for A&E firms and custom machine builders
Engineering firms that do research for clients face an extra test. Under IRC § 41(d)(4)(H), research funded by another party does not qualify. Courts have looked at contract terms to decide this; in Meyer, Borgman & Johnson, an engineering firm's claim was disallowed because the contracts did not put the risk of failure on the firm. Contracts billed on time and materials or cost-plus are often treated as funded, because the firm gets paid whether or not the research succeeds. Fixed-price contracts, where the firm bears the cost of technical failure, are more likely to qualify, and the firm must also keep substantial rights in the results.
So before choosing a fee model, sort your projects:
- Fixed-price work where you carry the technical risk and keep rights: candidates for the claim.
- T&M or cost-plus client work: usually excluded unless the contract terms clearly shift risk to you.
- Internal product development: generally strong candidates.
An adviser who claims T&M client work without reviewing the contracts is a red flag under either fee model. The A&E Form 6765 substantiation playbook covers contract review in detail.
06Section 174A, offshore work and the credit
The credit sits alongside the deduction rules for research spending. Domestic research and experimental expenditures can be expensed under Section 174A, while foreign R&E remains subject to 15-year amortization under Section 174, with only 3.33% deductible in Year 1. At a 21% federal rate, that is a Year-1 cash-tax drag of about 20.3% of foreign R&E spend.
Worked example: moving $300,000 of qualified contractor work offshore loses $195,000 of QRE (65% of $300,000), about $15,400 of federal credit at 7.9%, and adds about $60,900 of Year-1 tax drag from amortization. A good study, fixed or contingency, should model this for any engineering team that mixes US and offshore resources. See the offshore CAD bureau comparison for the labor side of that trade.
07State credits, amended years and what the fee covers
Two scope questions change the fee comparison more than the headline rate.
State credits. State R&D credits range from nothing in states without one to large incentives, for example California's incremental credit, which typically works out near 5.5% effective, or Arizona's 15% to 24%. A contingency fee charged on federal plus state credit grows with the state figure, even though the extra work to claim the state credit is often small because it reuses the same QRE data. In our example, the state credit adds $63,450 and, at 25%, $15,863 of fee. Ask whether a fixed-fee study includes state filings, and at what price if not.
Amended years. Many first-time claims also look back at open prior years. A contingency fee on three years of credit triples; a fixed fee for prior years is usually lower per year, because the projects and people are already mapped. Ask for the look-back priced separately, year by year.
Finally, check what happens to the fee when the credit is used. Credits that cannot be used in the current year carry forward; ask whether a contingency fee is due when the credit is claimed or when it actually reduces tax.
08Questions to put to any R&D credit adviser
Compare proposals line by line. A low fee with weak answers here is not a bargain.
| Question | Why it matters | Good answer |
|---|---|---|
| How is the fee calculated, and on which credit figure? | Contingency on gross or net, federal only or plus state | Stated in writing with a worked example |
| Is audit defense included, and for how long? | Exams can come years later | Included for the full statute period |
| How are business components identified? | Form 6765 Section G detail | Project list with technical narratives |
| Who reviews the technical content? | Narratives must hold up to technical questions | Engineers, ideally PE-level review |
| How are funded-research contracts reviewed? | § 41(d)(4)(H) exclusions | Contract-by-contract review |
| What happens if the credit is reduced on exam? | Contingency fees may or may not be refunded | Fee refund or adjustment terms in writing |
Run your own numbers in the R&D credit and Section 174 calculator before you sign either kind of engagement.
09Run the numbers: iRC Section 41 R&D tax credit, Section 174A and contingency fee audit calculator
The same benchmarks as this sheet, with your inputs. Share link and printable brief open the full calculator page.
Benchmarks are typical 2025-2026 market ranges compiled by Engineer Aid, an independent desk not affiliated with the vendors named. Quotes vary by region, volume and timing; nothing here is legal, tax or engineering advice. Revised 2026-11-06.
Questions buyers ask
What is a normal fee for an R&D tax credit study?
Contingency advisers commonly charge 20% to 30% of the credit, with 25% a frequent figure. Fixed-fee studies benchmark at about $8,500 plus $1,200 per business component, typically $12,000 to $28,000 in total, depending on the number of projects.
Is a contingency or fixed fee better for an R&D credit study?
It depends on credit size. With eight business components, a fixed fee of $18,100 breaks even with a 25% contingency fee at a credit of $72,400. Below that, contingency is cheaper in cash; above it, the fixed fee saves more with every dollar of credit.
How much is the federal R&D tax credit worth?
Under the Alternative Simplified Credit, the benchmark net yield is about 7.9% of qualified research expenses after the Section 280C reduced-credit election, with a range of about 6.5% to 9.2%. Firms with flat QREs over three years get less, about 5.5%, because the 14% rate only applies above half the prior average.
What is Form 6765 Section G?
It is the part of Form 6765 where taxpayers report qualified research by business component, meaning each product, process or project claimed, with related expense detail. It makes project-level documentation central to the claim, so blanket payroll percentages are harder to support.
Can engineering firms claim the R&D credit on client projects?
Only if the research is not funded under IRC § 41(d)(4)(H). Time-and-materials and cost-plus contracts are often treated as funded because the firm is paid regardless of success, while fixed-price contracts that put the risk of failure on the firm and leave it substantial rights are more likely to qualify.