https://www.hdb.gov.sg/cs/infoweb/residential/buying-a-flat/new/hdb-flat

Income/ allowance that will be considered for income assessment
Allowances (fixed/ variable) received on a regular basis (e.g. allowances for food, transport, laundry, uniform, etc.)

Sustenance allowance

Stipend
Income/ allowance that will not be considered for income assessment
Alimony allowance

Bonuses

Director's fee

Income from overtime work

Interest from deposit accounts

National Service Allowance

Rental income

Scholarship overseas allowance

^Overseas cost of living allowance

^Pension