What Is the Series 66 Exam?
The Series 66 is the Uniform Combined State Law Exam, NASAA’s two-for-one. A single pass covers the ground of the Series 63 (state law for broker-dealer agents) and the Series 65 (state law for investment adviser representatives), so that with the Series 7 alongside it, one exam qualifies you for both registrations at the state level.
NASAA is the North American Securities Administrators Association, the organization of state securities regulators, and it owns the exam’s content; FINRA administers it at the same test centers as its own exams. Here’s what the exam is, what passing it actually gets you, and who it’s for.
The exam in one paragraph
The Series 66 is 100 scored questions (plus 10 unscored pretest items you won’t be able to identify) in 2 hours 30 minutes, for a $177 fee, with a passing score of 73, 73 of the 100 scored questions correct. Unlike the Series 7, you don’t need a firm to sponsor you into the exam itself: anyone can enroll and sit. The full numbers, including scheduling and retake rules, are on the Series 66 cost and format page.
What passing it gets you, and the co-requisite catch
The Series 66 has no prerequisite to sit. But the exam only completes a registration when paired with two FINRA exams: the SIE® and the Series 7 are co-requisites for registering through the 66 route. The arithmetic of the paths:
- Series 66 + Series 7 (+ SIE): qualifies you as both an agent of a broker-dealer and an investment adviser representative (IAR). This is what the “combined” in the exam’s name means: it equals taking the Series 63 and Series 65 separately.
- Series 66 without the Series 7: an incomplete pass. It doesn’t substitute for the Series 65’s standalone IAR qualification, because the 66 was written assuming Series 7 knowledge sits underneath it.
That structure explains the exam’s population: the Series 66 makes sense precisely for people who are getting the Series 7 anyway.
Who takes it
The typical candidate is a “dual-hatted” representative, someone at a broker-dealer that also runs an advisory business, who will both execute brokerage trades as an agent and give fee-based advice as an IAR. That’s the standard arrangement at wirehouses and most full-service firms, which is why the 66 is the state-law exam those firms put new hires through during onboarding, usually in the same stretch as the Series 7.
If your role only needs one hat, a different NASAA exam fits better: the Series 63 alone for brokerage-only agents, or the Series 65 alone for advisory-only careers; the Series 65 requires no SIE and no Series 7 at all. The Series 66 vs SIE page walks the fork in the road.
How long a pass lasts
A Series 66 pass stays valid while you’re registered and for 2 years after you leave a firm. NASAA’s Exam Validity Extension Program (EVEP) can extend that to 5 years in participating states if you keep up its continuing-education requirement, the state-side analog of FINRA’s MQP, but adopted state by state rather than uniformly.
How hard is it
NASAA doesn’t publish a pass rate. Prep-industry estimates cluster around 65–70%, and they’re exactly that: estimates. What’s not in dispute is where the difficulty lives: 45% of the scored questions are laws, regulations, and unethical practices, material the FINRA exams barely touch, and the questions test the boundaries of definitions rather than the definitions themselves. The Series 66 study guide builds a plan around that.
Where to start
If the SIE is still ahead of you, it’s the first exam on this path and the only one you can knock out before a firm hires you: what the SIE exam is explains it, and free SIE practice questions will show you where you stand today. The full Series 66 picture (facts table, outline weights, and the path through all three exams) is in the Series 66 exam guide.