State tax refunds are considered taxable income (form 1040, line 10). If I'm due to receive a state refund, but instead of receiving it I elect to apply it to current year tax, do the feds still consider the refund as taxable income?
We itemize. Hmm, so the state refund is taxable even if applied to state tax. What makes it confusing is state income tax is deductible on the federal return (sch A, line 5). So, if rather than take possession of the state refund I apply to toward state taxes doing so appears to cancel the tax that otherwise would be due on the refund.
One thing to be mindful of is that the state income tax refund is considered ordinary income in the following year's federal income tax return. And along with that comes any consequences of having more income which is part of your AGI. This can affect your deductible medical expenses, your ACA insurance subsidy, and other credits or deductions which have phaseouts at higher income levels.