Currently there are sign on bonuses on offer but read the fine print should one be offered to you in time. For example, Lateral SGT’s/CAPT’s can get them but WO2’s/MAJ’s cannot. So, its math time!
In some cases, taking the the bonus can mean you ‘take home’ more over 3 years than promotion with the associated deductions (DHA/higher tax bracket). Your tax agent will be able to calculate this for you.
Also factor in the increased promotion work load vs actual take home pay depending on your role. Reward vs Effort!