Employer support

Welcome to Mercer Super

On 1 April 2023, your employees who were members of BT Super were transferred to Mercer Super via a Successor Fund Transfer process. Following the successful transfer, Mercer Super now has the privilege of looking after the retirement savings of more than 850,000 Australians.

How to send employer contributions to Mercer Super

All employees have new Mercer Super member numbers, and a new Mercer Super Unique Superannuation Identifier (USI) number has now replaced the old BT Super USI.

It is important that you update your relevant systems with your employees’ new member numbers and USIs. 

The information below is only relevant for employers who have been making contributions to the following two BT Super USIs: BTA0287AU and ASG0007AU.

The following diagram should help you determine which Unique Superannuation Identifier (USI) to use when making contributions on behalf of those employees who transferred from BT Super to Mercer Super on 1 April 2023.

There are three possible Mercer Super USIs, each corresponding to a different product. These are outlined in the table below.

Your employee(s) will be able to provide you with their account and USI details once they receive their welcome letter.

Choosing your Mercer Super Unique Superannuation identifier


Unique Superannuation Identifier (USI) list for Mercer Super

BT Product   Mercer Product Mercer USI
BT Super  Corporate (employer plan) Mercer Business Super 19905422981708
BT Super for life Retained Mercer Business Super 19905422981708


Mercer SmartSuper


Mercer SmartSuper

Westpac Group Plan Retained Westpac Group Plan 19905422981709



To further help you prepare and support your employees through the transition please refer to the resources below.

Ensure you're set up to receive updates from Mercer Super

To ensure your employees are receiving all the information they need about Mercer Super, it’s important to check you are able to access the following Mercer Super websites and email domains via your internal network. If you’re not able to access these websites, you may need to speak with your IT or Technology department to have these website and email domains ‘whitelisted’.

Mercer Super websites:

  • register.mercerfinancialservices.com
  • secure.superfacts.com
  • super-retirement.com.au
  • youraccountonline.com
  • mercerfinancialservices.com
  • superfacts.com
  • mercersuper.com.au
  • mercer.com.au

Mercer Super email domains:

  • @super-retirement.com.au
  • @e.mercersuper.com.au

Please note your employees are able to select their communication preferences, and can opt-out of receiving some email communications where applicable.

Frequently Asked Questions

To help answer some of the questions you may have regarding the transfer of your employee’s BT Super account to Mercer Super, and to help you support your employees, please refer to the list of FAQs below.

For general questions or questions relating to your employees and the transition, please see our member FAQs


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  • What does the transfer mean for me as an Employer?

    Now that the transfer has been completed all employees will have new Mercer Super Member Numbers, and the new Mercer Super Unique Superannuation Identifier (USI) will replace the old BT Super USI.

    Depending on the payroll solution you have in place, and how this is integrated with the way you manage your employees’ super contributions, it may be important to ensure your relevant systems are updated with your employees’ new Member Numbers and Unique Superannuation Identifiers (USIs). 

  • We sent Choice contributions to BT Super. What’s the impact?

    Please see the "How to send employer contributions to Mercer Super" section above.

  • Did my employer account and account number change?

    Yes, Employers will receive new reference numbers as a result of the transfer. Mercer Super refers to these as a Fund Employer Number (FEN).

  • Which products did the transfer include?

    This transfer included BT Super, BT Super for Life or BT Super for Life – Westpac Group Plan account members, including Defined Benefit accounts.

    All other BT accounts were not part of the transfer into Mercer Super, including Asgard accounts.

  • Were my employer plan’s discounts and design retained?

    Yes – as part of the agreement with BT Super, Mercer Super, for the majority of plans, retained (and in some cases, improved) employer plans’ administration fee discounts.

  • What happened with my BT Relationship Manager?

    Relationship Managers with the BT Super team moved to Mercer Super as part of the transfer. So the knowledge and background of your relationship and needs are maintained in the Mercer Super team.

    They will continue to support you now that the transfer process has been completed. We will advise you if there are any changes to the key contact for your employer plan.

  • What changed for employer policy committees?

    If you had an arrangement for BT Super Policy Committee Meetings, these will continue with Mercer Super. You will now have access to additional secretarial support and a data analytics engine, which delivers real-time reports for meetings.

    Details about Policy Committee Meeting arrangements, such as start date, next annual meeting due date and number of representatives, were transferred to Mercer Super with employer plan details.

Your Employees

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  • Have my employees been communicated with?

    Your employees will have received a Significant Event Notification (SEN) from BT Super on or around 30 January 2023 outlining all the details about the changes to their account.

    Your employees will also receive a Welcome Letter from Mercer Super, which will contain all of their account details.

  • Did all members receive the same communications from BT?

    No, there were different versions of the Significant Event Notice (SEN) and booklets associated with the transfer to Mercer Super that were relevant to different groups of members.  

  • Some employees were Mercer members before the transfer.

    Your employee accounts that were are already with Mercer Super prior to the transfer on 1 April 2023 will be moved to the same Plan in the coming months.

    In the meantime, you will need to continue submitting these contributions under the separate login until further notice.

    • Plan name: Mercer SmartSuper Plan
    • USI: 199 05 22 981 888

    We are working to update our systems to ensure all your contributions can be submitted under a single login, and expect to have further information on this in the coming months. Please refer to your existing Mercer Business Super Employer Guide for more information.


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  • Do I still use QuickSuper? What do I need to consider?

    Yes, if you used QuickSuper with BT Super, you can continue using QuickSuper with Mercer Super to manage super contributions for your employees.

    As the transfer process has been completed, you will receive your Mercer QuickSuper login details in the coming days. You will automatically have Mercer Super set as the employer fund relationship and default employees will be set-up with the correct Unique Superannuation Identifier (USI).

    If you use a different portal, you will need to manually update this information.

  • Is the new Mercer QuickSuper the same as the BT Super one?

    No, there are some slight changes to what is required in the Member Registration process. Details will be provided to you directly through the QuickSuper portal, in early April.

    Additionally, Mercer Super has provided an addendum to the QuickSuper User Guide to cover changes you may encounter between the services. 

  • What are the changes for QuickSuper?

    If you use QuickSuper to manage employee contributions, your employer plan information will be set up on the Mercer QuickSuper portal with your new USI and member account numbers. You will receive your login details in early April.

    Please note:

    • Read-only access to BT QuickSuper will remain in place for 12 months after the transfer date.
    • Any users who have not accessed the BT Super QuickSuper portal for more than 365 days before the transfer date will not be transferred to the new Mercer QuickSuper portal.
  • Will my old BT QuickSuper login details work?

    You will receive your separate Mercer QuickSuper login details in early April.

    You will have read-only access to the BT QuickSuper portal for 12 months after the transfer date.

  • What do I need to do in QuickSuper to make the change?

    If you used BT QuickSuper to manage your employees’ super contributions, you will automatically have Mercer Super set as the employer fund relationship and default employees will be set-up with the correct Unique Superannuation Identifier (USI).

    You will be able to run a report in Mercer QuickSuper that will provide you with your new USI and Member Number details.

  • I use QuickSuper. How will I get the new Member Numbers?

    In early April you’ll receive an email with your login information to Mercer QuickSuper, where we'll have pre-loaded your new USI and member account numbers for your employees

  • What if I have my own file format in QuickSuper?

    Prior to the transfer BT Super assigned the existing mapping into the Mercer QuickSuper portal for employers that have their own file format.

  • What if I had a non-standard Authorisation Model?

    Prior to the transfer BT Super assigned the existing mapping into the Mercer QuickSuper portal for employers that have this file format. However, please note that the functionality that restricts user access to a single site is not available in Mercer QuickSuper – all registered users will have access to all sites within your employer plan.

  • Can I get help with QuickSuper questions about the transfer?

    If you have any QuickSuper questions, please call 1300 553 010 Monday to Friday 8.00am and 6.30pm (AEST/AEDT).

  • We use BT QuickSuper but have our default fund elsewhere?

    We provide a clearing house solution for employers to contribute to Mercer administered funds.

    If you will not be contributing to the Mercer Super fund once the transfer process has been completed, you won’t be able to use the Mercer QuickSuper site as a clearing house.


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  • I use another solution to run our Super, any changes?

    You will need to update information in the portal or payroll solution you use, including the new USI  to reflect your new Mercer Super default fund (please see the "Choosing your Mercer Super Unique Superannuation Identifier" section above).

    This will enable new members and contributions to flow through to Mercer Super. Depending on the portal or solution you use, you may also need to provide member numbers for employees who have been transferred from BT Super to Mercer Super.

    If you don’t have the new Mercer Super member numbers for your employees, you can either leave this field blank (if your payroll solution allows this) or input their previous BT Super member number. Our systems will use all of the information you provide (including name, date of birth and Tax File Number) to ensure the contributions are allocated to the correct account.

    If your super Plan has multiple open benefit categories, you will need to input the applicable benefit category into your payroll portal or solution when registering a new member.

Further information

If you require further information please contact Mercer Super on 1800 682 525, Monday to Friday, 8am – 7pm (AEST/AEDT).

Disclaimer: This content has been prepared on behalf of Mercer Superannuation (Australia) Limited (‘Mercer Super’), ABN 79 004 717 533, Australian Financial Services Licence #235906, the trustee of the Mercer Super Trust ABN 19 905 422 981. Any advice is of a general nature only, and does not take into account the personal needs and circumstances of any particular individual. Prior to acting on any information, you need to take into account your own financial circumstances. Please consider the Product Disclosure Statement, Product Guide, Insurance Guide, and Financial Services Guide before making a decision about the product, or seek professional advice from a licensed, or appropriately authorised financial adviser if you are unsure of what action to take. Past performance is not a reliable indicator of future performance. 'MERCER' is a registered trademark of Mercer (Australia) Pty Ltd ABN 32 005 315 917. Copyright 2024 Mercer LLC. All rights reserved.
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