I received a helpful answer to a similar question from TurboTaxCindyH, but then the whole question was inexplicably deleted. So let me try to summarize the answer here: You have to enter the full amount from the 1099-G under Federal/Income & Wages/Other Common Income/State and Local Tax Refunds *and* you can enter the tax you *would have* paid *without* the kicker under Deductions & Credits/Estimates & Other Taxes Paid/Other Income Tax/Balance due on your 2017 state taxes paid in 2018.
