How Much Does Group Health Insurance Cost in South Carolina

South Carolina does not have a group health price. It has a published survey average for establishments that already offer coverage, and it has a rating machine — a county rating area, a closed list of federal factors, and a renewal formula — that produces your number when an issuer runs your group through it. Those two things get confused, and confusing them is how an employer ends up planning against a figure that was never about them.

This post gives you both: the South Carolina figures that exist, stated as their source states them, and the mechanism that actually decides what you are offered.

Read the qualifiers before you read the figures

Every South Carolina figure below comes from the Medical Expenditure Panel Survey Insurance Component, the annual employer survey fielded by the Census Bureau for AHRQ. The state table is titled “Table II. State of South Carolina, private-sector data by firm size, 2025,” published July 2026, and it is the current edition — there is no 2026 South Carolina workbook. Three qualifiers travel with every number it publishes, and none of them is optional.

It counts establishments, sorted by the size of the firm that owns them. The survey’s own technical notes say the sample “is selected, and collection takes place at the establishment (unit) level. An establishment is generally a single physical location; a firm can consist of just a single establishment or multiple establishments.” The unit measured is a workplace; the size band describes the company above it.

The column is labeled “Less than 50 employees,” and that is not South Carolina’s statutory small-employer test. S.C. Code § 38-71-920(1) describes an employer that “employed no more than fifty eligible employees or employed an average of not more than fifty employees on business days during the preceding calendar year” — no more than fifty, inclusive, measured retrospectively, with affiliated companies counted as one employer. South Carolina then carries a second scope test: § 38-71-1340(A) applies the availability article to “groups of two to fifty.” The survey column matches neither exactly.

The premium rows are conditioned on offering. Each one is measured at establishments that offer health insurance. They describe the group that already made the purchase, never South Carolina small employers generally.

The South Carolina figures that exist

With all three qualifiers attached, here is what the survey reports for South Carolina private-sector establishments in firms with fewer than 50 employees, data year 2025.

The survey reports that 21.2% of those establishments offered health insurance. That is the row labeled “Percent of establishments that offer health insurance,” and it is the denominator behind everything that follows.

For establishments that do offer, the survey puts the average total single premium at $9,020 per enrolled employee. Read that label carefully: it is the total premium — employer and employee portions combined — it is annual, it is per enrolled employee, and it is single coverage. It is not the employer’s cost and it is not a monthly figure.

For the same population, the average total family premium is $23,531 per enrolled employee, on the same annual, total-premium basis.

Those are the figures. They are a description of a survey population, not an input to your budget, and the survey publishes them with standard errors precisely because they are estimates of a population rather than measurements of a business.

The employee share is published; the employer share is not

The survey reports an average annual employee contribution of $1,881 for single coverage at South Carolina establishments that offer coverage in this size band, and it reports that employees enrolled in single coverage contributed 20.8% of the total premium.

There is no employer-share row anywhere in the South Carolina table. Every row in it was searched for one. That absence matters more than it sounds: the natural move is to subtract the employee percentage from the whole and call the remainder the employer’s share, and that number does not exist in the source. Neither does its spelled-out cousin. What can honestly be said is the sentence the source supports: employees contributed 20.8% of the total premium for single coverage, and the employer covered the rest.

The family side cannot be split at all. The average employee contribution for family coverage in this band is suppressed in the South Carolina table, so the family premium figure above stands alone and must not be paired with the single-coverage contribution as if the two described one household.

South Carolina draws a rating area for every county

South Carolina has 46 geographic rating areas — one per county, covering all 46 counties. The CMS page for the state is headed “South Carolina Geographic Rating Areas: Including State Specific Geographic Divisions,” and its table parses to forty-six data rows, one county name per rating area identifier. The three-digit zip code column exists and is empty on every row, which means no South Carolina county is subdivided by zip for rating purposes.

That is unusually clean. In states that draw areas on metro definitions or zip clusters, the first question is which part of a city you are in. In South Carolina the question is only which county your address is in.

An area identifier is a label, not a price. The CMS source publishes structure and nothing else; it carries no premium-by-area figure, and no inference that one area is dearer than another is available from it.

Four South Carolina markets sit in more than one rating area

Because the areas are county-shaped and several South Carolina cities are not, the state’s best-known markets do not map one-to-one onto rating geography.

Charleston spans Charleston and Berkeley counties, which are rating areas 10 and 8. North Charleston spans Charleston, Berkeley and Dorchester — areas 10, 8 and 18. Columbia spans Richland, Lexington and Kershaw, which are areas 40, 32 and 28. Florence spans Florence and Darlington, areas 21 and 16. Greenville sits wholly within Greenville County, area 23; Spartanburg wholly within Spartanburg County, area 42; and Rock Hill wholly within York County, area 46.

South Carolina’s own statutes make the split legible. Sections 55-11-310 and 55-11-320 constitute Richland and Lexington counties as the Richland-Lexington Airport District, a political subdivision of the State, with the Columbia City Council appointing to its commission alongside both county delegations — one governmental body laid across a rating-area boundary. Section 55-11-110 does the same for Greenville and Spartanburg counties as the Greenville-Spartanburg Airport District: two markets on this list, one district, two rating areas. Section 55-11-610 constitutes Florence, Marion and Dillon counties as the Pee Dee Regional Airport District, and each of the three sits in a separate area. Charleston’s case is statutory too — § 54-3-110 names Charleston as one of the State’s seaports alongside Georgetown and Jasper — and its landside labor shed runs on into counties that are separate areas again.

None of that changes how your group is rated, because one address governs. Federal rule sets small-group rating geography “using the group policyholder’s principal business address,” and where that address is registered solely for service of process and is not a substantial worksite, it uses “the business address within the State where the greatest number of employees of such policyholder works” (45 C.F.R. § 147.102(a)(1)(ii)(B)). The practical consequence for a South Carolina employer is that the rating area follows the county of that one address, not the city name on the letterhead — so a move that carries the principal business address across a county line changes the geography the group is rated on.

What the federal rule lets an insurer vary a small-group rate on

The federal factor list is short and it is closed. Under 45 C.F.R. § 147.102(a)(1), a small-group rate “may vary with respect to the particular plan or coverage involved only by determining the following”: whether the coverage is for an individual or a family; rating area; age; and tobacco use. Paragraph (a)(2) then shuts the door: “The rate must not vary with respect to the particular plan or coverage involved by any other factor not described in paragraph (a)(1) of this section.”

Health status is not on that list. Neither is your industry, your claims history, or how long you have held the policy.

What South Carolina’s own rating statute names

South Carolina regulates small-employer rates through an index-rate and class-of-business mechanism rather than a single band, and the statute is old. The subarticle at §§ 38-71-910 to -990 was enacted by 1991 Act No. 131, § 5, and amended in 1993, 1994 and 1997, and § 38-71-940 itself was amended once, by 1997 Act No. 70, § 3, and not since.

Its factor set is § 38-71-920(5), which defines “case characteristics” as “age, gender, geographic area, industry, group size, and family composition,” adds that “geographic areas smaller than a county may not be used without prior approval of the director or his designee,” and then excludes three things by name: “claim experience, health status, and duration of coverage since issue are not case characteristics for the purposes of this subarticle.”

The machinery around that set is worth knowing because it explains the vocabulary on a renewal letter. An insurer sorts small employers into classes of business, established only on the grounds § 38-71-920(9) allows — distribution channel, blocks acquired from another insurer, association business with “not less than fifty small employers,” or a common group formed to obtain insurance — plus “no more than two additional groupings” on criteria other than group size expected to produce substantial variation in administrative and marketing costs. Within each class it sets a base premium rate, “the lowest premium rate charged or which could have been charged,” and an index rate, “the arithmetic average of the applicable base premium rate and the corresponding highest premium rate.” Section 38-71-940(A)(1) and (A)(2) then constrain how far one class’s index rate may sit from another’s, and how far an individual employer’s rate may sit from its own class index. Section 38-71-940(C) forbids an insurer to “transfer involuntarily a small employer into or out of a class of business.”

A renewal increase is a sum, not a number

This is the most useful thing in the South Carolina statute for an employer reading a renewal. Section 38-71-940(A)(3) does not cap a renewal increase with one figure. It says the percentage increase “may not exceed the sum of” three named components:

• the percentage change in the insurer’s new business premium rate across the rating period, or, where the insurer is not issuing new policies in that class, the change in the base premium rate;
• an adjustment “due to the claim experience, health status, or duration of coverage of the employees or dependents of the small employer as determined from the insurer’s rate manual for the class of business,” which the statute caps separately and prorates for rating periods under a year; and
• “any adjustment due to change in coverage or change in the case characteristics of the small employer.”

Three components, three different causes. A renewal that moved because your census aged is a different event from one that moved because the class’s new business rate moved, and the statute treats them separately. Section 38-71-960 requires an insurer to disclose “the provisions concerning the insurer’s right to change premium rates and the factors, including case characteristics, which affect changes in premium rates,” along with “a description of the class of business in which the small employer is or will be included.” If a renewal arrives as one undifferentiated percentage, that disclosure is the thing to ask for.

Note the internal distinction the statute draws and an employer should not blur. Claim experience and health status are barred as case characteristics under § 38-71-920(5), and then reappear as a capped renewal adjustment under § 38-71-940(A)(3)(b). In the 1991 design, health experience is out of the base rate and inside the renewal increment.

Two instruments, both on the books

South Carolina’s statute names gender, industry and group size as permitted case characteristics, and contemplates a renewal adjustment tied to claim experience and health status. The federal rule names four factors and closes the list against everything else, for plan years beginning on or after January 1, 2014. The state provision is current as published and unrepealed; the federal rule is current and says what it says.

Nothing read for this post resolves which instrument governs a given South Carolina policy, and this is not a question we answer. The honest framing is descriptive: both are on the books, and what an employer is actually charged comes out of what the issuer files and the South Carolina Department of Insurance approves. Two statutory facts reinforce that. Under § 38-71-970(B), each small employer insurer files an actuarial certification with the department every March first. And under § 38-71-980, the director “may suspend all or any part of Section 38-71-940 as to the premium rates applicable to one or more small employers for one or more rating periods” on an insurer filing and a finding about the insurer’s financial condition or market fairness. The state bands are not a permanent fixture even on their own terms — they are suspendable by the regulator who supervises them.