What is the best interests duty?

Claudia AinsleyWritten byClaudia Ainsley
Reviewed byMatt Leeburn
Updated 09 Sept 2026

The best interests duty is a statutory obligation requiring financial advisers giving personal advice and mortgage brokers arranging credit to put the customer's interests first.

Also known as: BID, broker best interests duty, best interest duty

Key points

  • Financial advisers owe the duty under the Corporations Act; mortgage brokers under Part 3-5A of the NCCP Act, explained by ASIC's Regulatory Guide 273.
  • For advisers it is triggered by personal advice; for mortgage brokers it applies whenever they provide credit assistance to a consumer.
  • Meeting it means a documented fact-find, a genuine comparison of several suitable options and a written reason for the recommendation.
  • Disclosing commissions and conflicts is necessary but not enough: conflicts must be avoided or actively managed.
  • ASIC enforces it, and poor documentation and failing to consider alternatives are the most common breaches.

Who the duty applies to and when

What reasonable steps look like

Conflicts of interest and common failures

Enforcement and what customers can expect

Example

Not to be confused with

Responsible lending obligations
responsible lending tests whether a loan is unsuitable for the customer; the best interests duty tests whether the recommendation served the customer
Design and distribution obligations (DDO)
design and distribution obligations sit with the product issuer; the best interests duty sits with the adviser giving personal advice or the mortgage broker providing credit assistance

Frequently asked questions

What is the best interests duty for mortgage brokers?

Under Part 3-5A of the NCCP Act, mortgage brokers must act in the customer's best interests when they provide credit assistance, and must put the customer's interests first if there is a conflict. ASIC's Regulatory Guide 273 explains what that means: a proper fact-find, a genuine comparison of options, a documented reason for the recommendation and active management of lender incentives.

What triggers the best interests duty?

It depends on the regime. A financial adviser is caught when they give personal advice, meaning advice that considers the customer's objectives, financial situation or needs. A mortgage broker is caught whenever they provide credit assistance to a consumer under the NCCP Act, whether or not the conversation counts as personal advice.

Is disclosing a commission enough to satisfy the best interests duty?

No. Disclosure is required, but on its own it does not manage the conflict. Where a commission or volume bonus could influence a recommendation, the adviser or broker needs to eliminate the incentive or actively manage it, for example through independent benchmarking or review gates, and document what was done.

How does a broker show they acted in my best interests?

Through the file. A documented fact-find, a comparison of several suitable options showing costs, features and risks, a short written recommendation explaining why the chosen loan suits your situation, and disclosures of remuneration and conflicts given before or at the time of the advice. Regulators and AFCA judge conduct on that evidence.

What can I do if my broker did not act in my best interests?

Raise it with the broker and their licensee first through their internal complaints process. If that does not resolve it, lodge a complaint with the Australian Financial Complaints Authority, which can order compensation or vary a contract. Serious or systemic conduct can also be reported to ASIC.

Go deeper

Sources

This article is general information only and is not financial advice.