property tax

Property Tax in Charleston SC: How Your Bill Is Calculated

Charleston property tax is set by an assessment ratio applied to your home's value, then multiplied by local millage rates. Whether the home is your primary residence decides whether the 4% or 6% ratio applies.

Housing Ledger Editorial

13 Oct 2026 • 5 min read

Property tax in Charleston SC is figured from the home's assessed value, not its sale price. Assessed value is a fixed share of market value, and the assessment ratio is the percentage that gives you that share. Your bill starts there. For the next step, see Property Tax in Georgetown TX: How Your Bill Works.

Your bill also depends on whether the home is your legal residence, and on the local millage, the tax rate set for your area. The county's legal residence (4%) exemption application is the form owner-occupants use to qualify for the lower ratio ^[1].

For the most recent published rates, use the county's 2025 property tax rate tables, which list South Carolina rates by county ^[2]. Those tables give you the millage to plug into your own estimate.

How Is the Bill Calculated From Value and Millage?

Your bill comes from two numbers: assessed value and millage. Assessed value is the taxable part of your home's worth, and millage is the rate applied to it.

Market value is what your home would likely sell for. Assessed value is a percentage of that figure, and the percentage depends on how the home is used. Charleston uses a 4% or 6% assessment, and the one that applies depends on the property's status ^[3]. A 4% ratio means only 4 cents of every market dollar is taxed, so the ratio matters as much as the rate.

Millage is tax per $1,000 of assessed value

A mill is one-tenth of a cent, so a 200-mill rate means $200 for every $1,000 assessed. Property tax rates in South Carolina are published county by county ^[2], so the rate on your bill reflects your local government's budget.

A worked example

Use round numbers to see how the pieces fit. Suppose a home has a market value of $300,000 and qualifies for the 4% ratio.

The estimated annual bill in this example is $2,400. If the same home were taxed at 6% instead, its assessed value would rise to $18,000 and the bill would rise to $3,600, so the ratio alone changes the bill by $1,200 at the same millage.

A calculator sits beside a stack of papers and a pen on a wooden desk, suggesting tax figures being worked out by hand.

Why Does Owner-Occupied Housing Get a 4% Rate?

The rate follows how you use the property, not what kind of house it is. A home you live in as your main residence can be assessed at 4%, while other property is taxed at the 6% ratio ^[4]^[3].

The county's form is titled "Legal Residence (4%) Exemption Application," and the assessor uses it to decide whether you qualify ^[1]. If you qualify, your bill is based on the lower ratio.

What happens if you are not eligible

If the assessor finds the owner-occupant ineligible, the 6% ratio applies ^[1]. For example, if the assessor rules that a home is not your legal residence, the same home value produces a bill calculated at the higher ratio. The change can be large, so it helps to understand the rule before you buy.

You are not stuck with that result. The owner may appeal the assessor's decision ^[1]. Start the appeal soon after you receive a bill at the higher rate on a home you live in.

Second homes and investment properties

Second homes and investment properties fall under the 6% ratio ^[3]. A vacation home or a rental is taxed at the higher ratio, even if you pay the bill yourself.

The gap between the two ratios adds up over time. On the same home value, 6% of assessed value is half again as much as 4% ^[4]^[3].

A white two-story family home with a front porch and flower beds sits on a quiet residential street on a sunny day.

What Is the Effective Property Tax Rate in Charleston County?

Treat that spread as a range, not a single quoted rate.

One estimate puts the average effective rate at around 0.51% of a home's assessed value ^[5]. The other puts it at 0.32%, and calls that one of the lowest rates in the state ^[6].

The two estimates are built differently, so the gap between them reflects method, not a mistake in either one. Neither is the exact rate on your home. Use them to size a budget, not to set one.

Turning a rate into an estimated bill

An effective rate is a percentage, so the math is multiplication. Multiply the assessed value by the rate to get an annual estimate, then divide by 12 for a monthly figure.

For a $400,000 home, using an assessed value equal to the price for simplicity:

At 0.51%: $400,000 × 0.0051 = $2,040 a year, or about $170 a month.
At 0.32%: $400,000 × 0.0032 = $1,280 a year, or about $107 a month.

The gap is $760 a year on this home. A smaller home shows the same pattern. At $250,000, the two rates give about $1,275 and $800 a year.

Your assessed value may not match the price you pay, so swap in your own figure before you compare the results with your budget. Run both rates on that number. The higher result is the safer figure to plan around, because it covers the bill if the estimate is at the upper end of the range.

Where and How Do You Pay Charleston County Property Tax?

You can pay a Charleston County property tax bill three ways: by cash or check at the Treasurer's Office, by credit card on the county's online services page, or through the state's payment page. Choose the route that fits how you prefer to pay.

Pay the Treasurer's Office with cash or check. Take your bill and a cash or check payment to the Treasurer's Office. The county confirms that you can pay your property tax bill there with cash or check ^[7]. This route suits owners who do not want to pay by card or do not bank online.
Pay by credit card online. Go to the county's online services page to pay by card. The page states that you can also pay by credit card online at SC-Charleston ^[7]. Use this option if you want to pay from home and receive the payment electronically.
Use the state's property tax payments page. The state publishes a Property Tax Payments page on sc.gov ^[8]. The page is tied to My SC.GOV, where you can create a personalized digital wallet and subscribe to services ^[8]. Use it for state-level payment options. Unlike the county options, it is run by the state, so the county's Treasurer's Office does not process payments through it.

If you are unsure which route to use, start with the county page, since it covers both the in-person and card options for county bills. Then use the state page only if you want the state's own payment tools.

Who Pays More and Who Pays Less?

If the assessor finds an owner-occupant ineligible, the six percent assessment ratio applies instead ^[1].

Investors and second-home buyers should expect the 6% ratio, because the 4% rate only covers owner-occupants ^[1].

Before you make an offer, pull the county's current rate tables and use the rates for the year you will pay. The rate tables in your source are labeled for 2025 ^[2].