My wife has worked for this employer for over a decade, and I have entered the payer's TIN instead of an EIN each year without incident since the employer doesn't have an EIN. Did the e-filing rules change for the 1099-NEC? This employer doesn't have an EIN. Does this mean we can no longer e-file our federal return because of this?
That should not matter. Has she been filing Schedule C for it?
Actually I would just enter your total income as Other self employment income or as Cash or General income. You don't need to get a 1099NEC or 1099Misc or 1099K. Even if you did you can enter all your income as Cash. Only the total goes to schedule C.
How to enter income from Self Employment