R&D Tax Credit Fees: Contingency, Fixed and Hybrid Arrangements, and What the Fee Should Include

R&D tax credit study fees are generally set in one of three ways: a contingency fee calculated as a percentage of the credit, a fixed fee for a defined scope, or a hybrid of the two. No model suits every company. What separates one proposal from another is what the fee is measured against, what work it covers, and what happens to the fee if the credit is reduced or cannot be used right away.

That makes the headline percentage or price an incomplete basis for comparison. A lower percentage applied to a broader base, or a fixed fee that leaves out examination support, can cost more than it first appears.

The Three Fee Models

Model	How the fee is set	What it rewards
Contingency	A percentage of the credit	A larger credit
Fixed	A set price for a defined scope	Completing the agreed scope
Hybrid	A fixed base plus a percentage, or a percentage with a cap or minimum	Some of each

Contingency. The fee is a percentage of the credit, so the provider carries the risk that the study finds little. The term that matters most is the base. The credit identified in the study, the credit claimed on the return and the credit allowed after any examination can be different numbers, and so can a federal-only base and a federal-plus-state base.

Fixed. The price is agreed in advance for a defined scope of entities, tax years, states and deliverables, and it does not rise with the credit. The term that matters most is the scope boundary: what triggers an additional charge, such as another tax year, an amended return or administrative adjustment request, or examination support.

Hybrid. Arrangements vary: a reduced fixed fee plus a smaller percentage, a percentage subject to a cap or a minimum, or a fixed fee for the current-year study with a percentage on prior-year claims. The term that matters most is how the parts interact.

How Each Model Aligns Incentives

Contingency ties the provider to the size of the credit. That can encourage a thorough search for qualifying work. It also means pay rises with every position taken, including any that may not hold up under examination. A fee measured on the credit claimed and payable at filing leaves the risk of a later reduction with the business unless the agreement says otherwise.

Timing can separate the fee from the benefit. A credit is not always usable in the year it is claimed. It may be limited by the general business credit limit and carried forward (generally for up to 20 years), applied against payroll taxes quarter by quarter under the payroll election, or limited at owner level for S corporations and partnerships. A fee due in full when the study is delivered can come due before the business sees the tax benefit.

Fixed fees tie the provider to the agreed scope. Pay does not depend on the size of the credit, which removes one incentive to stretch positions. The provider’s obligation is the defined work, so the scope has to include everything the claim needs.

Hybrids split the difference. They can lower the upfront cost while limiting the share of the credit paid away, and they carry the questions of both models.

What the Fee Should Include

A study fee should cover the work needed to compute, claim and defend the credit. Compare proposals item by item:

• Business component analysis: identifying each product, process, software or other business component and testing the work on each against the four-part test.
• Wage and supply allocation: tying employee time and supply costs to qualified activities, with support for each allocation.
• Contract research review: confirming which contractor payments qualify (generally 65 percent of amounts paid for qualified research) and reviewing customer contracts for funded research.
• Both credit calculations: computing the regular credit and the alternative simplified credit and recommending a method.
• The section 280C decision: modeling the full credit against the reduced credit election, which must be made on an original timely filed return, including extensions.
• Section G of Form 6765: business component information that is optional for tax years beginning before 2026 and required for tax years beginning after 2025, unless an exception applies.
• Payroll election analysis, where eligible: for a qualified small business (gross receipts under $5 million and none before the five-year period ending with the credit year), whether to apply up to $500,000 a year against payroll taxes.
• State credits: identifying and computing credits in the states where the business operates, where a state offers one.
• Documentation: a written study connecting activities, people and costs, delivered to the business (our post on documentation for R&D tax credits covers what it contains).
• Refund-claim information for prior years: where open years are claimed on amended returns or, for a partnership subject to the centralized partnership audit regime (a BBA partnership), on an administrative adjustment request (AAR), the IRS requires the business components, the research activities performed for each, and total qualified wage, supply and contract research expenses. Since June 18, 2024 it no longer requires, with the claim, the names of the individuals or the information each individual sought to discover, but it can still request them in an examination, so a study should keep them. For a new or increased credit claimed on an amended return, the Form 6765 instructions also require column 49(f) of Section G, a description of the information sought to be discovered for each business component, including for tax years beginning before 2026, when Section G is otherwise optional. A BBA partnership attaches Form 6765 with the claim information to its AAR, together with Forms 8985 and 8986 where required.
• Examination support: what the provider will do if the IRS examines the claim, through which stage, and when additional fees apply.

Contingent Fees and the Rules on Tax Practice

Circular 230 governs practice before the IRS by attorneys, CPAs, enrolled agents and others. Section 10.27 generally bars a practitioner from charging a contingent fee for services in connection with any matter before the IRS, but allows one for services connected with an IRS examination of, or challenge to, an original return (or an amended return or refund claim filed within 120 days of the taxpayer receiving written notice of the examination of, or a written challenge to, the original return), refund claims solely about statutory interest or penalties assessed by the IRS, and judicial proceedings arising under the Internal Revenue Code.

In Ridgely v. Lew (2014), the U.S. District Court for the District of Columbia held that the IRS lacks authority to enforce those restrictions against preparing and filing ordinary refund claims before any examination begins. In December 2024, Treasury proposed removing section 10.27 and treating contingent fees for preparing original or amended returns or refund claims before an examination begins as disreputable conduct. As of October 2026, those proposed rules have not been finalized, and section 10.27 remains in the regulations. CPA firms are also subject to professional ethics and state board rules on contingent fees.

For a business owner, the practical point is narrower. The rules turn on who the provider is, which services the fee covers and where the claim stands, so it is reasonable to ask any provider proposing a contingent or hybrid fee which rules apply to it and how the arrangement complies.

Questions to Ask Before You Sign

1. Is the fee measured on the credit identified, claimed or allowed, and does it include state credits?
2. When is the fee due, and does that change if the credit is carried forward, used against payroll tax over several quarters, or limited at owner level?
3. If the IRS reduces or disallows the credit, is any part of the fee refunded or adjusted?
4. Which items on the scope list above are included, and which carry a separate charge, including prior-year amended returns or AARs?
5. What examination support is included, through which stage, and how is additional time billed?
6. Who prepares Section G, and how will you coordinate with the CPA who prepares the return?
7. What documentation do we receive, and do we keep it if the engagement ends?
8. Which professional rules govern your fees?

Fees are one criterion among several. Our guides to what to look for in an R&D tax credit provider and software versus a specialist cover the others. Before comparing proposals, it helps to know the approximate size of the credit: you can estimate it with our R&D tax credit calculator, request a free analysis, or read about our R&D tax credit services.

Frequently Asked Questions

Are contingency fees for R&D studies allowed?

It depends on the provider and the service. Circular 230 restricts contingent fees in matters before the IRS, a 2014 court decision limited how far the IRS can enforce that restriction for refund claims, and proposed rules from December 2024 had not been finalized as of October 2026. Ask the provider which rules apply to it.

Is a lower percentage always cheaper?

No. The cost depends on the base the percentage applies to, the years and states included, and the terms for examination support and later adjustments. Compare the expected total fee for the same scope.

Should IRS examination support be included in the fee?

It should at least be defined. An engagement can include support through some or all of an examination, or bill it separately. Knowing which applies, and to what point, is part of comparing total cost.

What if the credit cannot be used this year?

Then fee timing matters. Unused credit is generally carried back one year and forward 20, the payroll election applies quarter by quarter, and pass-through owners face their own limits. Ask whether the fee is due at delivery regardless.

Does a fixed fee mean less work on the study?

Not necessarily. A fixed fee pays for a defined scope, and the quality of the study depends on what that scope includes and how the work is done. That is why the scope list matters more than the fee model.

This article provides general information about federal tax rules and is not tax advice. Speak with your tax adviser about your specific circumstances.