There are two instances where line 235 shows up:
A ) if you receive Old Age pension (reported on T4A-OAS)
or
B) if you receive employment insurance benefit (T4-E)
See this link :
Social benefits repayment: Old age security (OAS) benefits repayment
if you received T4A-OAS.
See this link :
Social benefits repayment: Employment insurance (EI) benefits repayment
if you received T4-E.
If your situation falls under any of the two categories above, line 235 will be generated
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