Series 66 vs Series 65: Which Should You Take? (2026)

If you are already looking at the Series 66, you are probably headed for a firm that both sells securities and manages fee-based accounts. This guide compares it to the Series 65 from that starting point: what each exam is, where the Series 7 draws the line between them, how much content actually overlaps, and which one fits your career path.

What is the difference between the Series 66 and the Series 65?

The core difference is the Series 7. The Series 66 requires the Series 7 as a co-requisite; the Series 65 requires nothing at all. Everything else follows from that one fact.

The Series 66 is NASAA’s Uniform Combined State Law Examination. It folds the state agent law from the Series 63 and the state investment adviser law from the Series 65 into a single sitting. Passing it (with the Series 7) registers you as both a securities agent and an Investment Adviser Representative at the state level.

The Series 65 is NASAA’s Uniform Investment Adviser Law Examination. It stands alone with no prerequisites: no Series 7, no SIE, no sponsoring firm. Passing it registers you as an Investment Adviser Representative only.

Both exams are owned by NASAA and administered by FINRA at Prometric test centers. Both qualify you as an IAR. The Series 66 adds the securities-agent registration on top, but only because it is paired with the Series 7.

How do the Series 66 and Series 65 compare side by side?

Here are the two exams on the specifications that matter. The Series 66 is shorter but carries a higher passing threshold; the Series 65 is longer and broader.

Why does the Series 7 decide which exam you take?

The Series 7 is the dividing line because the Series 66 was designed to sit on top of it. The Series 7 is the General Securities Representative exam, and it teaches the products: stocks, bonds, mutual funds, options, and more. The Series 66 assumes you already know all of that, so it skips product knowledge and tests only state law and ethics.

The Series 65 makes no such assumption. Because it stands alone, it has to teach the product knowledge itself. That is why the Series 65 is longer: it covers economics and investment vehicles that the Series 66 leaves to the Series 7.

This produces a clean rule:

• Have the Series 7, or your firm requires it: take the Series 66. You get agent and IAR registration in one exam instead of stacking the Series 63 and Series 65 separately.
• No Series 7 and you only want to advise for a fee: take the Series 65. Adding a Series 7 just to qualify for the Series 66 would mean a sponsoring firm, the SIE, and far more study for products you may never sell.

How much do the Series 66 and Series 65 overlap in content?

They overlap heavily on investment adviser law and ethics, which is the shared core of both exams. Where they diverge is product knowledge: the Series 65 teaches it, and the Series 66 leans on the Series 7 for it.

Think of it as two circles with a large shared middle:

• Shared by both: investment adviser and IAR regulation, fiduciary duty, the Uniform Securities Act, ethical business practices, and suitability of client recommendations. This is the bulk of the Series 66 and a large slice of the Series 65.
• Series 65 only: economics (GDP, inflation, monetary policy) and the deep product coverage of stocks, bonds, ETFs, and annuities. The Series 65 has to teach these because nothing else in its path does.
• Series 66 only: the state agent law borrowed from the Series 63, which the Series 65 does not cover on its own.

Which exam fits your career path?

Match the exam to the kind of firm you are joining. The Series 66 fits dual-registered reps at broker-dealers that are also RIAs; the Series 65 fits fee-only advisers who never sell products.

The Series 66 is the standard choice at a firm that operates as both a broker-dealer and an RIA, because a single rep there needs to both execute trades and manage advisory accounts. The Series 65 is the standard choice at a pure RIA, where advisers charge fees for advice and route trades through a custodian like Schwab or Fidelity rather than executing them in-house.

Is the Series 66 harder than the Series 65?

Neither has published pass rates, so difficulty is a judgment call, and it depends on how you learn. The Series 66 carries a slightly higher passing threshold (73% versus 71%) and is denser in regulation; the Series 65 is longer but more varied.

The case that the Series 66 feels harder: it is almost entirely state law and ethics, which many candidates find monotonous to memorize. It also arrives late in a long sequence (SIE, then Series 7, then Series 66), so fatigue and overconfidence set in. Some candidates who struggled with the Series 66 passed both the Series 65 and Series 63 on their first attempts.

The case that the Series 65 feels harder: it is the longest of the NASAA exams at 130 scored questions and three hours, and it forces you to learn economics and products from scratch with no Series 7 backstop.

Should I take the Series 66 or switch to the Series 65?

Stay with the Series 66 if you need the securities-agent registration and you have (or will get) the Series 7, since one combined exam beats stacking the Series 63 and Series 65 separately. Switch to the Series 65 only if you realize you do not need to sell securities at all, in which case the Series 7 co-requirement is wasted effort.

A few situations that should make you reconsider:

• You will never sell products. If your role is purely fee-based advice, you do not need the Series 7, so you do not need the Series 66. The Series 65 alone gets you there faster and cheaper.
• You have no sponsoring firm yet. The Series 66 path runs through the Series 7, which requires firm sponsorship. The Series 65 needs no sponsor, so a career changer or aspiring RIA owner can start immediately.
• You already sell securities on a Series 7 and just need to add advice. The Series 66 is the efficient add-on. You could instead add the Series 65 on top of your existing Series 7, but the Series 66 also folds in the Series 63 state agent law, which you likely still need.