More of my clients get blindsided by South Carolina property taxes than by anything else in the transaction — and it cuts both directions. People moving here from New Jersey or Illinois see a legal-residence tax bill and assume there's been a mistake. People buying a second home or a rental look up the current owner's tax bill, budget from that number, and then get a bill that's roughly twice what they planned for.
Both reactions come from the same thing: South Carolina doesn't tax all residential property the same way, and the number on a listing sheet is the seller's tax bill, not yours. This is how the bill is actually built, what changes the year you buy, and which deadlines cost real money. For where taxes fit into the rest of a purchase budget, my complete guide to buying a home in Myrtle Beach covers the whole cost picture.
How a Horry County Tax Bill Is Actually Calculated
Three separate offices touch your bill, and knowing which does what saves a lot of phone calls. Per Horry County: the Assessor appraises real property, the Auditor maintains the tax rolls and calculates the individual bills, and the Treasurer collects the money. The formula the county publishes is fair market value × assessment ratio × millage rate = taxes.
One mill is one thousandth of one dollar. Millage is set annually — county council sets the county levy, and the school district, municipalities, fire districts, and special districts each add their own to the same bill. That's why two houses worth the same amount, a few miles apart, can owe meaningfully different taxes. The assessment ratio is where South Carolina gets unusual, and it's the single biggest variable on your bill.
The 4% vs. 6% Assessment Ratio
Under S.C. Code § 12-43-220, residential property falls into one of two buckets:
| Property type | Assessment ratio | Statutory basis |
|---|---|---|
| Legal residence — owner-occupied primary home, plus up to five contiguous acres | 4% | § 12-43-220(c)(1) |
| All other real property — second homes, rentals, land, commercial | 6% | § 12-43-220(e) |
Legal residence is defined narrowly: "the permanent home or dwelling place owned by a person and occupied by the owner," where the owner intends to remain permanently for an indefinite time. The Horry County Assessor states plainly that it "shall not include a residence maintained principally for vacation or recreational purposes." The ratio covers the residence and not more than five acres contiguous to it; additional dwellings on the same property occupied by immediate family members of the owner can also qualify; and if any part of the property is rented as a separate residence or used as a business for profit, the 4% value doesn't apply to that portion.
The application, and the deadline that catches new owners
The 4% ratio is not automatic — you have to apply. Under § 12-43-220(c)(2)(ii), the owner or the owner's agent must apply "before the first penalty date for the payment of taxes for the tax year for which the owner first claims eligibility." In practice that's the January 15 following the tax year; Horry County's own example is tax year 2024, with a filing window of January 1, 2024 to January 15, 2025.
The Assessor's guidance is blunt, and I'll quote it because it's the most expensive sentence on their page: "failure to file and become qualified means an automatic 6% assessment."
Two more rules worth putting on your calendar. Once you've qualified, you don't reapply while the property keeps meeting the requirements — but if you move your legal residence to a different property, you must file a new application on the new residence during the filing period. And if your use of the property changes, you must notify the Assessor within six months.
The penalty for getting it wrong
The application requires you to certify, under penalty of perjury, that the residence is your legal domicile, that neither you nor any member of your household claims legal residency in another jurisdiction for any purpose, and that neither claims the 4% ratio on another residence. Sign that, get the ratio, and later be found ineligible — or lose eligibility and fail to notify the Assessor within six months — and § 12-43-220(c)(2)(vii) imposes a penalty equal to 100% of the tax paid, plus interest at one-half of one percent a month, floored at $30 and capped at the current year's taxes.
There's a protection here for buyers that almost nobody knows about. Under subsubitem (vii)(B), where the property has undergone an assessable transfer of interest and the buyer is a bona fide purchaser for value without notice, those penalties and back taxes are the transferor's personal liability — not a lien on the property, and not enforceable against it in the buyer's hands. If the previous owner was wrongly claiming 4%, that's their problem, not a cloud on your title.
The School Operating Credit — Why 4% Saves More Than It Looks
This is the part almost every out-of-state buyer misses, and it's worth more than the ratio difference by itself.
Under S.C. Code § 12-37-220(B)(47), 100% of the fair market value of owner-occupied residential property eligible for the special assessment ratio is exempt from all property taxes imposed for school operating purposes — though not from millage imposed to repay school general obligation debt. The Horry County Assessor describes legal residence as including exactly this: "a tax credit in which the school operation tax is exempted."
So qualifying for 4% does two things at once: it cuts your assessed value by a third relative to 6%, and it strips the school operating millage — typically the largest single component of the levy — off your bill entirely. Horry County publishes a worked example showing both effects. Their footnote states the millage used is tax year 2023 for the unincorporated county (County 56.2, School 128.1, Fire 23.2, Waste Management 8.7 — 216.2 mills), and excludes municipalities, special districts, and fees billed on the same notice:
| Step | Legal residence (4%) | All other property (6%) |
|---|---|---|
| Fair market value | $200,000 | $200,000 |
| × Assessment ratio | 4% | 6% |
| = Assessed value | $8,000 | $12,000 |
| × Millage (.2162) | $1,729.60 | $2,594.40 |
| − School operating credit | −$944.80 ($8,000 × .1181) | none |
| = Taxes due | $784.80 | $2,594.40 |
Same house. Same value. Roughly a 3.3× difference in the annual bill, driven entirely by whether it's your legal residence.
Two honest caveats. First, the millage is the county's published tax year 2023 figure for the unincorporated area — an illustration of the mechanics, not a current quote. Second, Horry County labels the 6% column "a commercial property," but § 12-43-220(e) is the catch-all for "all other real property not herein provided for," and the school operating exemption in § 12-37-220(B)(47) reaches only owner-occupied property eligible for the special ratio. A second home or a long-term rental sits in that same 6% column, with the same absence of a school operating credit.
For a real number on a real address, use the Horry County Assessor's Tax Estimator, which runs current millage against a specific parcel. If you're weighing a rental purchase, my investment property guide covers how the 6% ratio changes deal math, and my mortgage calculator folds taxes into the monthly picture.
What Happens to Your Taxes the Year You Buy
Here's the mistake I intercept most often: a buyer pulls the current tax bill for a listing and budgets from it. That bill reflects the seller's assessment ratio and the seller's capped value, and neither transfers to you.
A conveyance by deed is an assessable transfer of interest (ATI) under S.C. Code § 12-37-3150 — as are land contracts, most conveyances to or distributions from a trust, distributions under a will or by intestate succession, and leases running more than twenty years. The statute carves out specific family transfers, including property going to a spouse.
An ATI triggers a fresh appraisal. Under § 12-37-3140(A)(1)(b), fair market value resets to its value as of December 31 of the year the ATI occurred, and under § 12-37-3140(E), that change is first subject to tax in the following tax year.
The 15% cap does not protect you
South Carolina limits how fast a countywide reassessment can raise your value: under § 12-37-3140(B), any increase attributable to the periodic countywide appraisal and equalization program is capped at 15% within a five-year period, calculated on land and improvements as a whole.
That cap has two express exceptions, and one of them is the transaction you're in the middle of. It doesn't apply to additions or improvements in the year they first become subject to tax, and it doesn't apply "to the fair market value of real property when an assessable transfer of interest occurred in the year that the transfer value is first subject to tax." Translation: a long-time owner may be sitting on a value the cap has held well below market, and your purchase wipes that protection out. Budget from an estimate at your purchase price and your ratio, never from the seller's bill.
The 25% ATI exemption on 6% property
If you're buying at the 6% ratio, S.C. Code § 12-37-3135 offers partial relief: for 6% property that undergoes an ATI after 2010, there's an exemption equal to 25% of the ATI fair market value, with a hard floor — no exemption value may be less than the parcel's current fair market value on the assessor's books, and if the ATI value is already below current fair market value the exemption doesn't apply at all.
It isn't automatic either. Under § 12-37-3135(C), it doesn't apply unless the owner or the owner's agent notifies the county assessor before January 31 of the tax year for which it's first claimed. Buying a second home or a rental here? Put that notification on your closing checklist.
Reassessment, Assessment Notices, and How to Appeal
Under § 12-43-217, each county appraises and equalizes property in a countywide program on a five-year cycle; Horry County describes it as a review that "occurs every four years, and is implemented in the 5th year." Reassessment redistributes the burden rather than raising total revenue — state law requires local government to reduce the levy to rollback millage. The county's own summary of a reassessment year: "Some people will notice a decrease in taxes, some will stay the same, and some will pay more taxes."
You'll get a property tax assessment notice when it matters. Under S.C. Code § 12-60-2510, the assessor must send one whenever fair market value or special use value increases by $1,000 or more, or on a property's first assessment, by July 1 or as soon after as practical. In reassessment years substantially all notices must go out by October 1 — and if they don't, the prior year's assessment becomes the basis for that tax year. Read it: it's the only document that tells you what the county thinks your house is worth before the bill arrives.
Your appeal window depends on that notice. If you received one, you must give the assessor written notice of objection within 90 days after it was mailed, objecting to the fair market value, the special use value, the assessment ratio, or the assessment itself. If there was no notice that year, you may appeal in writing at any time — filed before the first penalty date it applies to that tax year, and on or after it, to the succeeding tax year.
Exemptions Worth Asking About
The Homestead Exemption is separate from legal residence, and people mix the two up constantly. Under S.C. Code § 12-37-250 it exempts the first $50,000 of fair market value of the dwelling place from county, municipal, school, and special assessment taxes.
You qualify if you've been a South Carolina resident for at least one year and have reached age 65 on or before December 31, are classified as totally and permanently disabled by a state or federal agency, or are legally blind as defined in § 43-25-20. For spouses who own jointly, it's enough that either meets one of those conditions, and a surviving spouse keeps it while remaining unmarried, as long as the dwelling stays their permanent home and legal residence.
Horry County handles this through a different office than legal residence: application must be made in person at the Horry County Auditor's Office by taxpayers who haven't previously qualified. That's a real trip-up for retirees who file legal residence with the Assessor and assume the homestead exemption came with it. It didn't.
If you're relocating here, my relocation guide covers the driver's license, vehicle registration, and voter registration side of establishing domicile — the same domicile the 4% certification asks you to swear to.
One more reason to get the legal residence classification filed: § 12-43-220(c) is also the gateway to South Carolina's wind-mitigation money. The SC Safe Home grant program and the state's retrofit and excess-premium tax credits all key off the same owner-occupied classification, which I break down in the four programs that pay you back for strengthening a coastal house.
When Bills Arrive, When They're Due, and What Late Costs
Under S.C. Code § 12-45-70, all taxes are due and payable between September 30 and January 15 after their assessment each year.
Miss it, and § 12-45-180 sets a fixed, escalating schedule:
| If unpaid before... | Penalty added | Running total |
|---|---|---|
| January 16 (or 30 days after tax notices are mailed, whichever is later) | 3% | 3% |
| February 2 | additional 7% | 10% |
| March 17 | additional 5% | 15% |
| After March 17 | Treasurer issues a tax execution and the account goes to delinquent collection under Chapter 51 | — |
The postmark governs for mailed payments, and the treasurer may waive a penalty caused by an improper postmark on proper evidence.
Section 12-45-180(B) matters to anyone who closes late in the year: if title transfers during a tax year, the records show the notice went to the prior owner, and the current owner got no timely notice of the tax due, the treasurer shall waive the penalties. It's not discretionary — call the Treasurer's office rather than paying. Taxes are also prorated between buyer and seller at the closing table, which is one of the questions worth asking your closing attorney out loud — see what gets recorded and what it costs.
Installment payments are available where a county has adopted them by ordinance: under § 12-45-75 a taxpayer may elect five installments of 16⅔% of the estimated obligation due February 15, April 15, June 15, August 15, and October 15, with the balance due by January 15. It isn't available for taxes paid through escrow, and you must notify the treasurer in writing between December 1 and January 15.
Frequently Asked Questions
Do I automatically get the 4% rate because I bought a house here? No. You must apply with the Horry County Assessor before the first penalty date for the tax year you first claim eligibility. Until you do, the property is assessed at 6%.
I'm buying a second home I'll use a few weeks a year. Can I get 4%? No. The Assessor's definition of legal residence expressly excludes a residence maintained principally for vacation or recreational purposes, and the certification asks you to swear the property is your domicile.
The listing shows low taxes. Can I use that number? Not for budgeting. That's the seller's ratio and the seller's capped value. Your purchase is an assessable transfer of interest, which resets fair market value and removes the 15% reassessment cap for that year. Run your own estimate.
Are the taxes different inside the city limits? Yes. A home inside Myrtle Beach, North Myrtle Beach, Surfside Beach, or Conway carries municipal millage on top of the county levy. Compare specific addresses, not towns.
Does buying a condo change any of this? The tax mechanics are identical. The differences are HOA dues, the master insurance policy, and rental restrictions — covered in my condo buying guide.
I'm selling. Does any of this affect my net? Taxes are prorated at closing, so the timing of your sale matters. My selling guide walks through net proceeds, and the South Carolina net sheet on my sellers page runs the arithmetic from any price you type in.
Get a Real Number Before You Write an Offer
The difference between 4% and 6% on the same house changes which neighborhoods work for you — and it's determined by facts about your situation we can sort out before you're under contract, not after. When you're looking at a specific property, I'll pull the parcel and run an estimate at your ratio, so the tax line in your budget is a real figure rather than the seller's — the same way I pull its flood zone before we talk about anything else. Browse current listings, read up on Grand Strand communities, or get in touch and we'll start with your actual numbers.
None of the above is tax or legal advice. Confirm current millage and your own eligibility with the Horry County Assessor, Auditor, and Treasurer, and talk to a South Carolina tax professional.
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