Just look at the scene from goodfellas when the guy pulls up to the bar in a brand new cadillac and they tell him to get rid of it not to attract attention.

Yeah there was no big robbery but if Roth was showing that he made $800/month from his pension on his tax return but lives in a 5million dollar house with 18 cars and solid gold shoes that might tip someone off that he might be involved in something more than just his pension.