Capital gains are not part of qualifying Ohio adjusted gross income, for purposes of qualifying for the Joint Filing Credit (JFC).
Capital Gains are part of Ohio adjusted gross income, for purposes of allocating income as Ohio or non Ohio income, for the Non resident tax credit. If the gain is jointly owned by both spouses (as it usually is) then your half is allocated as Ohio income on IT NRC but not on the JFC worksheet.
Your situation is very rare. But, the Ohio forms and TurboTax program are able to handle it, just not very transparently.
