I believe form F or whatever is a farm deductions form like a schedule C or D,, It might even be a schedule F.
After my 17th audit, I have decided to not deduct my farm chicken business, However, I will keep that for my next audit.
Yes, I really have been audited 17 times by the IRs. That does not count workmans comp audits and unemployment audits. The government likes to audit me.
As KlopKlop says you need to watch your expenses and have some income, what I gathered is you either need to make money occasionally or show you are expanding your base.
BTW of the 17 audits I only had to pay in twice, they owed me the rest, Because I hold something back, like farm income.