FICA taxes

FICA taxes generated from Special Receipts entered as Ordinary Income

I'm entering Special Receipts from oil & gas royalty payments for 2014-2018. Since these royalty payments are taxable, albeit subject to complex depletion allowances, I've selected Ordinary Income. However, that appears to cause ESPlanner to generate FICA taxes, which I believe is not correct. Is there a better way to model taxable royalty income w/o generating FICA taxes? In this case, there are no other income sources that would generate FICA taxes.