Line 16 on your form 1040 is your income tax. It would be calculated based on the IRS tax tables, unless one of the boxes under line 16 were checked (for form 8814 or 4972 for instance), in which case you would have to look for a tax worksheet in the supplemental schedules that would be included with your tax return.
To have your refund applied to next year, follow these steps in TurboTax:
- Other Tax Situations
- Additional Tax Payments
- Apply refund to next year
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