To determine how much of Lucia's state income tax refund is taxable on her 2023 federal return, we must consider the tax benefit rule. This rule states that a taxpayer must include in income any refund of state or local taxes to the extent that the deduction of those taxes provided a tax benefit in the prior year.
- Lucia claimed $1,200 in state income taxes as part of her itemized deductions in 2022.
- Her total itemized deductions were $17,400, meaning that if she had not claimed the state income tax deduction, her itemized deductions would not have been lower than the standard deduction for a single filer in 2022, which is $12,950.
- Since her itemized deductions exceeded the standard deduction, she received a tax benefit from her state tax deduction.
- Because she received a state tax refund of $1,200, which was the exact amount deducted, the entire refund is potentially taxable.
As a result, the entire $1,200 state income tax refund is taxable on her 2023 federal return.
Thus, the answer is:
$1,200