A request from a bank for identity documents or an explanation of where money came from can feel intrusive, particularly when the customer has held the account for years. These checks are part of a regulated system intended to prevent financial services being used for money laundering, terrorism financing and other serious crime.
The detail requested can vary because customer due diligence is risk based. Opening an account, changing ownership, making an unusual transaction or updating old records can trigger different questions. A request does not by itself mean the customer is accused of wrongdoing.
Identity checks establish who the bank is dealing with
Customer due diligence requires relevant businesses to collect and verify information about customers and, where applicable, beneficial owners or people acting on their behalf. Individuals, companies, trusts and partnerships therefore require different documents and authority checks.
Verification uses reliable and independent sources. A bank may ask for current identification, address details, company records, trust documents or information about controllers. If records conflict or have expired, the customer may need to clarify or update them before a service proceeds.
Ongoing due diligence means checks do not end when the account opens. Banks monitor activity and keep customer information current according to legal obligations and risk. A long-standing customer can still be asked to confirm details after a change in activity, ownership or regulation.
Source of funds is about a transaction
Source of funds asks where particular money came from and how it was obtained. Examples can include salary, sale proceeds, inheritance, business revenue, a loan or an investment redemption. The bank may request evidence such as statements, contracts, probate documents or settlement records.
Source of wealth is broader. It concerns how a person accumulated their overall wealth over time. This can be relevant where the relationship, transaction size or risk profile calls for enhanced due diligence. The evidence needed depends on the facts rather than a universal checklist.
A large transaction is not automatically suspicious, and a small transaction is not automatically low risk. Complexity, unusual patterns, high-risk connections, inconsistency with known activity and lack of an apparent lawful purpose can all affect the level of inquiry.
Respond securely and keep the explanation coherent
First confirm that the request is genuine using the bank’s official app, branch or independently verified contact details. Do not upload identity documents through an unexpected email link. Ask what documents are required, how they will be transmitted and whether sensitive information can be redacted without preventing verification.
Provide a concise explanation that matches the records. If money moved through several accounts, a simple timeline can help. Incomplete or inconsistent responses can create further questions even where the underlying transaction is legitimate.
Banks also have privacy and security obligations, but they may be restricted from explaining certain monitoring or reporting decisions. A customer who is dissatisfied can use the bank’s complaint process, while recognising that the bank cannot waive a statutory obligation through customer service.
Businesses can prepare by keeping ownership records, invoices, loan agreements and major transaction evidence organised. That reduces delay when a payment, account opening or finance application requires due diligence.
The checks protect the financial system but can still create friction. Clear requests, secure channels and proportionate evidence help balance legitimate customer access with the bank’s obligation to understand risk.
Transactions involving cash, overseas transfers, trusts, digital assets or third parties may require extra context because the origin and ownership can be less obvious from one statement. That does not mean these activities are prohibited. It means the bank may need a clearer evidence trail showing the parties, economic purpose and route of the funds.
Delays can sometimes be reduced before a major transaction. A customer expecting a property settlement, inheritance or business sale can ask the bank what information it may require and ensure account details are current. The bank still decides the checks at the relevant time, but organised records make a prompt, accurate response more likely.
If documents are in another language, certified translations or additional verification may be requested. Customers can ask the institution what standards it accepts before paying for copies. Sending more identity information than requested is not necessarily helpful and creates additional privacy exposure.
This article provides general information only and is not personal legal, privacy or financial advice. Requirements differ by institution, customer, service and risk, and current AUSTRAC guidance should be consulted.