Yes, you do need to enter the 1099G with the full amount. It is entered under state refunds:
- Federal
- Income & Wages
- Other Common Income
- State and Local Tax Refunds
You can also enter that you paid state taxes ($100) for 2017. Here's how:
- Deductions & Credits
- Estimates & Other Taxes Paid
- Other Income Tax
- Balance due on your 2017 state taxes paid in 2018
