whatever amount is on Line 1 of your 1040 you can put in a Roth,
as long as your AGI is below the cutoff and below the $6,000 limit.
If you don't have the compensation, and the IRS catches you, then there is a penalty of 6% per year.
If your Roth goes up a lot, or you expect it to, it might be worth it to pay that penalty. After one year from tax due date including extension, you can retain the earnings in that erroneous Roth within the Roth forever.
