Short answer. For almost every modern company, the alternative simplified credit (ASC) wins: it needs only the last three years of data, while the regular credit needs 1984 to 1988 base-period records most firms cannot reconstruct. Use the regular method only with clean 1980s records and a low fixed-base percentage.
The two methods side by side
Same credit, two formulas, very different record requirements.
| Factor | Regular credit | Alternative simplified credit |
|---|---|---|
| Rate | Up to 20% of qualified research above a base amount | 14% above 50% of the average of the prior three years |
| Data required | A fixed-base percentage tied to gross receipts and research from 1984 to 1988 | Only the last three years |
| Practical fit | Can be larger, but the base-period data is often impossible to reconstruct | Lower headline rate, but usable by almost any modern company |
| Winner / best for | Companies with clean 1980s records and a low fixed-base percentage | Almost every modern company |
Which one wins
It turns on history and records, not on the headline rate.
The regular credit can beat ASC for a company with a low fixed-base percentage and clean records back to the 1980s. Few modern companies have either, which is why ASC dominates in practice.
A company can compute both and elect the better result, subject to the rules on when the ASC election can be made and changed. That is a return decision for the CPA.
What both methods need
The method changes the formula, not the substantiation.
Either way, the credit rests on the same qualified research expenses, supported by the same four-part-test evidence per business component. The method is arithmetic on top of that foundation.
R&D Binder builds that foundation so either calculation has defensible inputs.
Related references
The pieces a method choice sits on:
Sources
Every claim on this page traces to a primary authority. Each source below is independent and verifiable.
- 26 U.S.C. § 41(c), determination of the credit amount - Cornell Law School, Legal Information Institute
- Treas. Reg. § 1.41-9, alternative simplified credit - Cornell Law School, Legal Information Institute
- IRS, Instructions for Form 6765 - Internal Revenue Service
Get documentation built to survive an exam
R&D Binder produces the qualified-research-expense figures both methods run on, so your CPA can compute either and choose. The binder is the evidence; the method election is theirs.