To be clear I live and am employed by a company in Iowa but still operate my farm in Illinois as secondary income.
You will have to report your Illinois farm income in both Illinois and Iowa.
There is a reciprocal agreement between those two states, but it only applies to wages, so your farm income will be taxable in Illinois (because you earned it there) and to Iowa (because you live there).
After you prepare your federal return, prepare your Illinois Nonresident return. Follow the screens carefully to show which income belongs to Illinois.
Next, prepare your Resident Iowa return. Iowa will give you a credit for income taxes paid to another state.
You will have to report your Illinois farm income in both Illinois and Iowa.
There is a reciprocal agreement between those two states, but it only applies to wages, so your farm income will be taxable in Illinois (because you earned it there) and to Iowa (because you live there).
After you prepare your federal return, prepare your Illinois Nonresident return. Follow the screens carefully to show which income belongs to Illinois.
Next, prepare your Resident Iowa return. Iowa will give you a credit for income taxes paid to another state.