Submitting a false return is a crime even if it does not result in tax
deficiency.
That may be true in theory, but in practice there are certain times
logic prevails. I will admit I once had a few shares from a spin-off of
a company. When I went to sell those shares, I lied. I claimed they had
zero basis. It was fraud, and I knew it. In an audit, if they asked how
I had the never to do such a thing, I was ready to state that the choice
to pay tax on the whole $20 those 4 shares were worth made more sense
than to spend even an hour (which I had already wasted) trying to come
up with the true higher basis. Criminal or not, I slept soundly after
filing that return, and the perhaps $2 extra was money well spent.
(Of course there are times not to do such things, but the OP's situation
and mine were not 'frivolous' positions to take. There are times that a
return is simple except for some nominal amount that requires reporting.
One can have the choice between hiring a $500 professional to
disposition that $100, or to assign it a place in the return where it's
subject to the highest rate, ordinary income, and not worry about going
to jail.)
JOE