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  • Large business support

    How to contact our large business specialists for support with your administrative, transactional and online queries.

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    Recommended channels

    All large clients are encouraged to use either:

    Alternatively, read about our customised service for the largest taxpayers.

    Large business phone service

    Use this service for ready access to ATO officers experienced in large business income tax and GST account enquiries, including:

    • debt and lodgment obligations (including deferral requests)
    • pay as you go (PAYG) withholding for large withholders.

    Contact us by:

    • phone on 1300 728 060 between 8:00 am and 5:00 pm (AEST or AEDT) Monday to Friday
    • fax on 1300 724 793

    International callers can either:

    • phone us on +61 2 6216 1111 between 8:00 am and 5:00 pm (AEST or AEDT) Monday to Friday and ask to be transferred to the appropriate area
    • fax us on +61 2 6225 0970.

    Large service team

    Our large service team are dedicated to assisting large public groups with turnover above $250 million.

    Use this service to assist, escalate or resolve your administrative, transactional and online queries when:

    • resolution of an issue has passed our service commitment timeframe
    • you are unable to use ATO online services
    • you have an urgent issue.

    Contact us by email

    Tax agents who represent public groups need to use Online services for agents and escalation channels.

    Last modified: 31 Jan 2023QC 45137