To record an owner who is registered for GST, go to Main - People & Firms and search for the contact.

Look for the option in the lower-right on the Main screen;

It is a good idea to indicate whether owners are registered for GST, as this will affect allocation of horse money and prize money.
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The Horse Ownership view will display clients who are registered for GST;

For more information regarding Horse Ownership, please refer to the Ardex Premier User Guide Horse Ownership in Ardex.