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Investment Advisers Act of 1940

Last updated 8 October 2026

The Investment Advisers Act of 1940 is a United States federal law that regulates professional investment advisers. It protects people who pay for financial advice by ensuring advisers put their clients' interests first and register with regulators.

From the Money Master HQ dictionary, founded by Shihan Sheriff (FCMA, CGMA, CPA (Australia), MBA (General), MBA (Data Science & AI), UAECA, CAAB, CAIS; VP of Finance at Nomod, CFO at Esanjo Ventures). How these definitions are written.

On this page

What it means

Passed by the US Congress, this law sets the rules for anyone who gives professional advice about investing in securities for a fee. It was created to prevent fraud and conflicts of interest in the financial industry.

Before this law, people calling themselves financial advisers could easily trick clients or hide fees. The law ensures that advisers act as fiduciaries.

This means they have a legal duty to act in the best financial interests of their clients at all times, rather than pushing products that simply earn the adviser a higher commission. In practice, this means registered advisers must provide clear, written disclosure documents.

These documents, often called Form ADV, detail their fees, investment strategies, background, and any potential conflicts of interest, such as earning kickbacks from specific funds. Clients use this information to make informed decisions about who manages their money.

For non-finance managers, understanding this law matters when your company hires external wealth managers, sets up employee retirement plans, or manages corporate treasury funds. It ensures you know what standards of honesty and transparency to expect from financial professionals.

If you run a business that touches financial advisory services, it dictates your strict compliance and registration duties. Think of the Investment Advisers Act like a professional code of conduct for doctors.

Just as a physician must legally put your health first and tell you about potential treatment side effects, this law forces financial advisers to put your wealth first and disclose all hidden costs.

In practice

Real-world examples

Example 1

A tech start-up founder hires a wealth manager to invest surplus cash. Under the Act, the adviser must formally disclose all fees and put the start-up's financial interests ahead of their own. The founder receives a written brochure that explains how the adviser is paid and which conflicts exist. This lets the founder compare the offer with two other advisers before choosing.

Example 2

A manufacturing business sets up a workplace pension scheme. The external consultant advising the company must be registered and transparent about any commissions earned from specific fund providers. The finance director compares two consultants by reading their disclosure documents side by side and chooses the one with fewer conflicts. She also asks each consultant to confirm in writing that they will act as a fiduciary for the pension scheme.

Example 3

A boutique consulting firm offers strategic financial planning to high-net-worth individuals. It must register as an investment adviser and provide written disclosures regarding its fee structures. The firm's compliance officer keeps records, reviews its marketing and updates its disclosures whenever its business changes. The firm also tells new clients, in plain language, that it is bound to act in their best interest. Clients can ask for a copy of these documents at any time, and the firm must deliver them promptly.

Think of it

Think of the Investment Advisers Act like a professional code of conduct for doctors. Just as a physician must legally put your health first and tell you about potential treatment side effects, this law forces financial advisers to put your wealth first and disclose all hidden costs.

Case study

Seen in the real world

This is a fictional, illustrative scenario. Greenfield Manufacturing, a mid-sized firm with $5 million in surplus cash, decided to hire an external advisory firm named Apex Capital to manage its treasury investments. Because Greenfield's managers understood basic regulatory standards, they requested Apex Capital's Form ADV document before signing any contracts. Upon reviewing the document, Greenfield discovered that Apex intended to invest the company funds into high-fee mutual funds where Apex partners received hidden kickbacks. Under the Investment Advisers Act of 1940, these conflicts of interest had to be explicitly disclosed in writing.

Greenfield's managers realised this arrangement failed to meet the fiduciary standard required by law. Greenfield walked away from Apex Capital and hired a fee-only advisory firm instead. This transparent firm charged a flat annual management fee of 0.5%, or $25,000 on $5 million. If Apex's chosen funds had carried total costs of about 1.3% a year, the bill would have been 5,000,000 x 0.013 = $65,000. The difference of 65,000 - 25,000 = $40,000 is the unnecessary cost that Greenfield avoided in the first year alone.

The disclosure rules gave the managers the information they needed to compare the offers and protected the company from predatory financial practices. The board then added a rule to its own treasury policy that every adviser must supply a current Form ADV before any contract is signed, and that the finance director must review it and report any conflicts to the audit committee. In this illustrative story, a few hours of reading saved the company a sum that would have paid several salaries.

Watch out

Common mistakes

  • Assuming all people who call themselves financial planners are legally bound to act in your best interest.
  • Failing to read the disclosure documents that outline an adviser's fees and hidden conflicts of interest.
  • Believing that this US federal law applies identically to everyday financial advisory practices in the United Kingdom.

Questions

People also ask

Does this law apply outside the United States?

No, it is a US federal law, though it can apply to foreign advisers who manage assets for US clients.

What does being a fiduciary actually mean?

It means the adviser has a legal obligation to put your financial interests above their own profits or commissions.

How can I check if an adviser is properly registered?

You can use the online Investment Adviser Public Disclosure database maintained by regulators to check their registration and history.

Sources and further reading

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Disclaimer

The information provided in this finance dictionary is for educational and informational purposes only. It should not be construed as financial, investment, legal, or tax advice. Always consult with a qualified professional before making any financial decisions. Money Master HQ makes no representations or warranties about the accuracy, completeness, or suitability of this information. Use of this content is at your own risk.