Series 65 vs Series 66: Which One Do You Need?

Both exams lead to the same registration, investment adviser representative, but through different doors. The Series 65 is NASAA's standalone adviser exam: pass it and you can register as an IAR without holding any FINRA license at all. The Series 66 is the Uniform Combined State Law Examination, which folds the Series 63 and 65 together, and it only registers you if your Series 7 is in place. NASAA's own rule: "to register as an investment adviser representative based on the Series 66, an individual must also have passed the FINRA Series 7 exam and the exam must be valid" (nasaa.org, accessed July 20, 2026).

By the numbers: the 65 runs 130 scored questions plus 10 unscored in 180 minutes, passing takes 92 correct, and it costs $187. The 66 is shorter at 100 scored questions plus 10 unscored in 150 minutes, passing takes 73, and it costs $177 (finra.org exam pages, accessed July 20, 2026).

If you are heading to a registered investment adviser and never plan to sell brokerage products, take the 65 and be done with it. There is no prerequisite and no sponsor: you open your own enrollment through FINRA's test enrollment system, pay the $187, and schedule at a test center.

If you are at a broker-dealer, or heading to one, and want advisory work on top of commission business, the standard stack is the SIE, the Series 7, and the 66. That combination covers brokerage registration, the state agent registration that would otherwise take a separate Series 63, and IAR registration in one sequence.

The fork usually comes down to who employs you rather than preference, because RIAs have no use for the Series 7 and broker-dealers rarely stop at the 65. Our exam-sequence planner maps both routes with current fees, NASAA also waives the Series 65 entirely for holders of the CFP, ChFC (or MSFS), CFA, PFS, and CIMA designations (nasaa.org exam FAQs, accessed July 20, 2026).

NASAA built the 66 for candidates who hold the Series 7, and the corequisite exists because the 66 leans on that license rather than retesting everything it covers. What you feel in the chair is mostly size: 100 scored questions in 150 minutes on the 66 against 130 in 180 on the 65, with both exams centered on state law, regulations, and ethics under the Uniform Securities Act.

Neither exam publishes an official pass rate, so ignore anyone quoting one without a source. The honest difficulty difference between the routes is that the 66 path requires the Series 7 first, and at 125 scored questions over 3 hours and 45 minutes, the 7 is a bigger exam than either adviser test (finra.org, accessed July 20, 2026).

The arithmetic favors the 66 whenever the Series 7 is already in your plan. Taking the 63 and 65 separately costs $334 in exam fees ($147 plus $187), while the 66 covers the same registrations for $177, a $157 difference before you count the seat time of a second exam (fees per finra.org, accessed July 20, 2026).

If an employer reimburses your exams, check whether it also covers the Series 7 fee of $395, the biggest single exam fee on this path. Compare prep costs for each exam on our best Series 65 and best Series 66 pages.