FL doesn't have an income tax.
Ohio requires you to use the same filing status that you used on the federal return. So if you file as Married Filing Jointly (MFJ) on the federal, you must file OH as MFJ.
You will be allowed to designate yourself as resident and her as non-resident. A non-resident credit will be allowed for the tax on her income.
Ohio does a convoluted tax calculation for non-residents/part year
residents. It calculates tax on total income, then it calculates a non
resident/part year resident credit, which it subtracts from the tax it
calculated on the total income. The credit is calculated as your non-Ohio
income divided by Total adjusted Income multiplied by the total tax. TurboTax
(TT) does this by allocating your income as either Ohio or non-Ohio. W-2
income will be allocated by the state name abbreviation shown in box 15 of your W-2. TT
will ask you, item by item, in the state section, how much of your other income
is Ohio or
non-Ohio income. Make sure that your non-Ohio wages show FL (Other state postal abbreviation) in box 15 of your W-2 screen, with the FL amount
in box 16.
Since FL does not have an income tax, boxes 15-17 may be blank on her
actual W-2. At the W-2 screen, in TT, enter FL in box 15. Put the box 1 amount in box 16
and 0 in box 17.
This system allows Ohio
to apply their highest tax rate, based on your total income, while only taxing
your Ohio
income.
Don't be surprised if you get some push back from the Ohio Dept of Taxation (ODT). They (like most snow belt states) take a dim view of dual state residents claiming FL residency for taxes.
