Charleston County property taxes are due Jan. 15. The Town of Mount Pleasant's 2025 rate is 260.4 mills. Apply for the 4% legal residence rate: 843-958-4100.
Last checked Oct. 12, 2026. Facts on this page come from the Charleston County Treasurer, Auditor and Assessor.
The Town of Mount Pleasant does not send its own property tax bill. Charleston County does it for every town in the county, and three county offices split the work: the Assessor sets your home’s value, the Auditor applies the tax rate and the Treasurer collects the money. Bills go out in the fall and are due Jan. 15.
Who to call
- Paying a bill, installment plan: Charleston County Treasurer, 843-958-4360
- Your value, the 4% legal residence rate, appeals: Charleston County Assessor, 843-958-4100, 4050 Bridge View Drive, North Charleston
- Tax rates, homestead exemption: Charleston County Auditor, 843-958-4200; homestead questions, 843-958-4220
- Pay online: Charleston County revenue collections portal
When the bill is due, and the penalties
Real property and business personal property taxes are due by Jan. 15 of the year after the bill is dated, the Treasurer’s office says. A bill mailed this fall is due Friday, Jan. 15, 2027. After that:
| Paid | Penalty |
|---|---|
| After Jan. 15 | 3% |
| After Feb. 1 | another 7%, or 10% in all |
| After March 17 | another 5%, or 15% in all, and the bill goes to the Delinquent Tax Department |
South Carolina law does not let the Treasurer take a partial payment on a single bill. If your mortgage company pays from escrow and the bill names an old lender, send a copy to your current lender. Car and truck taxes run on a different clock: they are due by the last day of the month your license plate expires.
Mount Pleasant’s tax rate
South Carolina sets rates in mills. One mill is $1 of tax for every $1,000 of assessed value. The Auditor’s 2025 millage levy (PDF), the latest posted, puts the Town of Mount Pleasant, tax district 21, at 260.4 mills:
| Levy | Mills |
|---|---|
| Charleston County School District, operating | 142.5 |
| Charleston County School District, bonds | 23.0 |
| County government, operating | 37.8 |
| County government, bonds | 5.7 |
| Parks and recreation, operating | 3.7 |
| Parks and recreation, bonds | 1.7 |
| Trident Technical College | 1.7 |
| Countywide subtotal | 216.1 |
| Town of Mount Pleasant, operating | 34.7 |
| Town of Mount Pleasant, bonds | 9.6 |
| Town subtotal | 44.3 |
| Total | 260.4 |
Homes outside the town limits with a Mount Pleasant mailing address are in a different tax district and pay a different rate; the same levy sheet lists every district. Your district number is printed on your bill.
Where the money goes
More than half the rate is the Charleston County School District’s operating levy. On a home that is your primary legal residence, the Auditor’s office says you receive an exemption from school operating millage, the largest line above. The Auditor’s tax estimator works out a bill for a given value and district, with credits.
Lower your bill: the 4% rate and the homestead exemption
The 4% legal residence rate. A home you own and live in as your primary legal residence can be assessed at 4% of its value instead of 6%. It is not automatic. Apply to the Assessor and prove you qualify; the deadline is typically Jan. 15, according to the county’s tax exemptions page. Use the online legal residence application or the printable form (PDF).
The homestead exemption. Owners who are 65 or older by Dec. 31 of the year before, totally and permanently disabled, or legally blind can have the first $50,000 of their home’s value excluded. You must have lived in South Carolina for at least a year and already have the 4% rate. Apply with the Auditor’s homestead exemption application (PDF) or call 843-958-4220.
How to appeal your value
Charleston County completed a countywide reassessment in 2025; state law calls for one every five years, and a reassessment can raise a home’s taxable value by no more than 15%, with exceptions such as homes sold since the last one. The Assessor’s appeals section sets out three local steps:
- Objection. In writing to the Assessor’s office within 90 days of the date the assessment notice was mailed. A phone call does not protect your rights.
- Protest. In writing within 30 days of the decision on your objection.
- Appeal to the County Board of Assessment Appeals within 30 days.
The state Administrative Law Court comes after that. Miss a deadline and the appeal is lost for the year. Mail with a verifiable date.
Pay in installments
The Treasurer’s Advance Property Tax Installment Plan spreads the bill over six payments: five equal payments every other month starting Feb. 15, based on last year’s tax, and the balance due by Jan. 15. Older bills must be paid off first, and accounts paid from escrow cannot join. Apply with the online installment application or call 843-958-4360.
What this means for you
- Bills mailed this fall are due Jan. 15, 2027; the penalty starts the next day.
- Bought a home in Mount Pleasant this year? Apply for the 4% rate now. At 6%, your home’s assessed value is half again as high.
- Value notices come with a 90-day objection window. Put the date on your calendar.
Related guides: trash and recycling, Mount Pleasant home prices and moving to Mount Pleasant.
Frequently asked questions
When are Charleston County property taxes due?
Real property tax bills are due by Jan. 15 of the year after they are issued. A 3% penalty applies after Jan. 15, rising to 10% after Feb. 1 and 15% after March 17.
What is the property tax rate in Mount Pleasant, SC?
The 2025 levy for the Town of Mount Pleasant (tax district 21) is 260.4 mills: 216.1 countywide mills plus 44.3 town mills, according to the Charleston County Auditor’s Office.
How do I get the 4% assessment ratio in Charleston County?
Apply to the Charleston County Assessor’s Office for the 4% legal residence special assessment on the home you own and live in. The deadline is typically Jan. 15. Without it, a home is assessed at 6%.
How do I appeal my property value in Charleston County?
File a written objection with the Charleston County Assessor’s Office within 90 days of the date your assessment notice was mailed. A protest and an appeal to the County Board of Assessment Appeals follow, each with a 30-day deadline.
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