If you Itemized Deductions in 2018, then your State Refund is taxable income for 2019.
If you used TurboTax last year, make sure you didn't actually use the Standard Deduction if your refund is showing as non-taxable in your Federal return.
Click this link for more info on How to Enter 1099-G for State Tax Refund.
If you did itemize deductions, then Virginia does tax your state refund.
This link gives details from Virginia Tax.
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