To apply a 2018 Federal refund to next year's taxes (2019), try this:
-
Federal Taxes tab (or Personal tab in the desktop Home and Business Edition)
- Subtab Other Tax Situations.
- Scroll down to Additional Tax Payments.
- One of the subtopics is Apply Refund to Next Year.
- It will ask you how much you wish to apply.
I believe a state overpayment you wish to apply to 2019 will be in your state interview.
