You have to pay your TurboTax fee before you can see the forms.
The Joint Filing credit is on line 13 of the Ohio schedule of Credits.
OHIO
Joint Filing Credit (JFC)
The income must be "qualifying" income.
Typically only earned income (e.g. wages) and retirement income are qualifying
income. Interest, dividends, rental income do not count.
Then, any Ohio
schedule A deductions (like excess
medical expenses) or Federal adjustments (the most common being an IRA
deduction) must be subtracted from the qualifying income. If either spouse has
less than $500 net, you will not qualify for the Joint filing credit. Take a
look at the allocation form that TT does, it should show these adjustments.
In the "forms mode", look at the Joint
Filing Credit Allocation Worksheet.
This is where your net qualifying income is calculated. It shows on line 4. If
either of you is less than $500 on line 4, you do not qualify.
