tk199 - they'll be able to change it over the phone for you - you can also change it online if you are registered for the self-service options through the Centrelink website. When you're providing your annual income estimate for FTB, you need to use the 'grossed-up' amount (the higher figure on your payslip). If the estimate you're providing is lower than the one you had previously, you may notice an increase in your fortnightly FTB payments HTH!