In box 21 of T4A (OAS) on mine and my wife's ,it has a -157.68 value and I can not put the minus sign in your program. What do I do now?

[TonyC11 · Accepted solution]

CRA's instruction on this box is to enter a zero, if your slip contains a negative entry in box 21.

The amount is net benefits paid, ie GIS and The Allowance, so Service Canada will adjust payments made to you. The amount is tax free in any case.