A basic calculation for Net Income from a T4 is to subtract from Box 14 any amounts included in Boxes 20 and Box 44. This is not exact for tax purposes of Line 236 as it will not include other income (T5, T3) or deductions (RRSP etc) but it will give you a basis to start from. It would be strongly suggested that you have your husbands Line 236 amount before filing.
