If the place where I work is telling me to work hour's for free, what
should I do ?

Whatever you want to do.

I am worried that working for free is illegal,
No it isn't

immoral,
No it isn't

unethical,
No it isn't

unprofessional,
No it isn't

and I am also worried that it exposes me to the possibility
of an IRS audit as I could be accused of getting paid "under the table"
But you're not earning anything. Why worry about an IRS audit?

I appreciate any replie's.
You're welcome

Perhaps you would care to be more specific? Then we may be able to give
more helpful responses.

--
Tony Roberts )
PP-ASEL
VFR-OTT - Night
Cessna 172H