Charleston property taxes in 2025 are impacted by the state’s mandated countywide property tax reassessment conducted every five years to reflect updated market values. In Charleston County, property values have notably increased since the last assessment in 2020, with median home prices jumping about 71%, which affects tax bills.
Key points about Charleston property taxes in 2025 include:
The average effective property tax rate in Charleston County is around 0.51% of the home’s assessed value, which is lower than many other U.S. regions.
The assessed value for owner-occupied residences is 4% of the home’s fair market value; this is then multiplied by the applicable millage rate minus any deductions to calculate the tax due.
There is a state law-imposed 15% cap on how much a property’s taxable value can increase from the prior assessment, protecting most homeowners from massive tax hikes even as market values rise.
Some exemptions like the ATI exemption can reduce taxable values for property owners by 25% of the difference between prior and new taxable values after property transfer.
Various tax credits and exemptions are available, such as homestead exemptions excluding the first $50,000 of market value for seniors or disabled homeowners.
Estimated sample calculations show that due to exemptions and tax relief programs, actual tax amounts can be substantially lower than gross calculations based on market assessments.
Charleston County offers property tax relief programs and encourages homeowners to contact the Assessor’s Office for disputes or queries regarding their assessments.
This reassessment aims to maintain fairness in tax distribution amid rising property values due to Charleston’s booming real estate market, with protections ensuring increases are manageable for most property owners.​
SOURCES
[1](https://livinginchs.com/blog/Charleston-County-Property-Tax-Reassessment-2025–What-Homeowners-Need-to-Know)
[2](https://dreamfindershomes.com/blog/property-taxes-charleston-sc/)
[3](https://screaltors.org/ati-exemption-give-your-clients-a-tax-break/)
[4](https://www.iop.net/finance/2025-charleston-county-reassessment-and-property-tax-notice-isle-palms-residents)
[5](https://www.charlestoncounty.gov/departments/auditor/files/2025-millage-card.pdf?v=893)
