You can apply for Family Tax Benefit by linking Centrelink to your myGov account and submitting a claim online. You’ll generally need details about your children, care arrangements, relationship status and estimated family income, along with any requested documents. You can claim during the financial year or after it ends, but Services Australia may need to balance your payment using your actual income. Check the eligibility rules and application steps at servicesaustralia.gov.au, as the outcome depends on your individual circumstances.