Every County in South Carolina uses the following property tax formula:
Tax Appraised Value x 6% = Taxable value x district millage rate
The rate can be reduced to 4% if you register the home at the county tax assessors office as your primary residence.
If you are 65 or older you can register at the county tax assessors office to have your tax value reduced by $50,000. (homestead election)
Every county has several districts that make up the millage rate, ie school district, fire district, library district, trash, water, police, municipality districts, etc. Most millage rates are between .25 and .30. One neighborhood can pay one millage rate and the neighborhood accross the road can pay slightly different millage rate depending upon the total of the districts it subscribes to and how cost effective that district is.
In effect, you should expect to pay about 1% of your taxable value in property taxes each year on your primary residence.
Sorry for the long winded answer, but it's the right way to tell you.