Short answer: Single: up to $95,000. Combined: up to $150,000. Includes all income sources.
For the First Home Grant and First Home Loan, you can earn up to $95,000 if buying alone, or $150,000 combined if buying with others. These caps include bonuses and overtime. If you earn a few dollars over, you get nothing.
Salary: $90,000
Bonus: $8,000
Total Income: $98,000
Over Cap By: $3,000
Result: Not eligible for First Home Grant