Should I report Cash income?

Hi everyone, I got made redundant just before Christmas and have been a stay at home dad since, I have two children 9 and 2. And have applied for FBT and Parenting Payment partnered. My partner earns about 1100 a week after tax.

To receive the parenting payment we both must report to centrelink our combined incomes every fortnight. But i am also a sparky who has done some cashies to keep afloat. If i deposit this cash into my bank (about 500 to 1000) on a regular basis will it get flagged? Especially if i report my partners income but say mine is zero?

Im a qualified sparky but i dont have my REC, so i dont know if centrelink or the gov will look into it further and see if i get reprimanded for doing electrical work for monetary compensation.