TurboTax does not support tax year 2018.
If trying to file a 2018 tax return that includes a tax refund, the refund will not be paid since it is beyond the 3 year limit from the due date of the tax return.
If you have taxes owed on the 2018 return you should seek out a local tax professional to assist you since penalties and interest on the unpaid taxes will continue to accrue until the taxes are paid.
