it will impact your ftba payment for the year - it's still under the low income threshold for ftbb. if you add 4000 to your ftba income for the year, the most you'll be overpaid is 800 - they will adjust your fortnightly payments to try and avoid this, as well as knowing you have the supplements for end of year which will be used to offset any debts anyway. if you're already over estimated your partners income, it may not impact you anyway