The South Carolina Department of Revenue combines two traditionally separate tax forms—the 1099-G and 1099-INT—into a combined 1099-G/INT form.
This combined form reports prior-year tax refunds, credits, and interest issued by the South Carolina Department of Revenue.
If your 1099-G/INT reports a prior-year South Carolina tax refund or credit (the most likely scenario), enter it just as you would a Form 1099-G.
If it's for interest income, you'd enter it as a Form 1099-INT.