You can see exactly what the tax will be here:
https://onlinemvd.dor.ga.gov/tap/welcome.aspx
It used to be $20.00 for a title and then hundreds every year for the tag, but they switched a few years ago to huge one time amount and then $20.00 for the tag every year. Too many people were sneaking cars in for less value based on doctored bills of sale. This way, its done by VIN number and everybody pays the same for the same kind of car, regardless of what you paid for it.
I'm getting ready to buy a 2015 P car and the one time TAVT is $7,845!!! Yes you read that right!!