Short answer: In South Carolina a sale is an "assessable transfer of interest," and it resets the property's taxable value to its market value (SC Code 12-37-3150). The new value is first taxed in the tax year after the sale (12-37-3140(E)), so a buyer's first bill may still show the seller's lower value. A 6% property that sells gets a 25% exemption from the new value, but only if the owner notifies the Beaufort County Assessor before January 31 of the first tax year (12-37-3135), and the taxable value can't fall below the value already on the books.
Key facts
- A sale resets value to market. A sale or other assessable transfer of interest (ATI) happens when the transfer documents are signed; recording isn't required (SC Code 12-37-3150; Beaufort County 2023 Reassessment Guide).
- Timing: the new value is first subject to tax in the following tax year (12-37-3140(E)).
- 15% cap: between sales, countywide reassessment can raise value no more than 15% in five years, not counting new improvements (12-37-3140(B)). The cap doesn't apply in the year a sale value is first taxed.
- 25% exemption: 6% property that sells is exempt on 25% of its new market value (12-37-3135, from 2011 Act 57).
- Floor: the exempted value can't be lower than the current value on the Assessor's books. If the sale value is below the books, the exemption doesn't apply.
- Deadline: the owner or agent must notify the Assessor that the property will be taxed at 6% before January 31 of the first tax year claimed.
- Entity transfers: a transfer of more than 50% of an entity that owns the property is an ATI and must be reported to the Assessor on an SCDOR form within 45 days, with a civil penalty of $100 to $1,000 for not reporting (12-37-3150(A)(8)).
- Beaufort County reassessment: last in 2023, next scheduled for 2028 (Assessor FAQ).
Why does my property tax go up after I buy?
Because the value on the County's books jumps from the seller's capped value to what you paid. South Carolina's 15% cap (Act 388 of 2006) limits how fast a home's taxable value can rise between sales. A home owned for many years on Hilton Head can carry a value well below market. When it sells, the Assessor reappraises it to market value (12-37-3150), and that new value starts the cap over.
The change doesn't show up right away. Under 12-37-3140(E), value changes from a sale are first taxed in the following tax year. If you close in 2026, your 2026 bill is usually figured on the seller's value, and the 2027 bill is the first on your price. That delay is why a first bill can look reassuringly low.
How much can the bill change? A worked example
Take a Hilton Head home in district 510 that sells for $900,000. The seller has owned it for years, and the County's books show $600,000. Tax year 2026 millage is 122.9 mills at 4% and 249.0 at 6%.
| Scenario | Taxable value | Assessed value | Tax a year |
|---|---|---|---|
| Seller, legal residence (4%), value on books | $600,000 | $24,000 | $2,949.60 |
| Buyer, legal residence (4%), after the reset | $900,000 | $36,000 | $4,424.40 |
| Buyer, second home (6%), 25% exemption claimed | $675,000 | $40,500 | $10,084.50 |
| Buyer, second home (6%), exemption missed | $900,000 | $54,000 | $13,446.00 |
The arithmetic for the exemption row: 25% of $900,000 is $225,000, so the exemption value is $675,000. That's above the $600,000 on the books, so the floor doesn't bite. $675,000 x 6% = $40,500 assessed; $40,500 x 249.0 / 1,000 = $10,084.50. Missing the January 31 notice costs this buyer $3,361.50 a year, every year they own it.
If the seller had the 4% ratio and this buyer will use the home as a second home, the bill goes from $2,949.60 to $10,084.50 even with the exemption. A buyer who budgets from the seller's bill is off by more than $7,000. Try your own numbers in the property tax calculator.
How does the floor on the 25% exemption work?
The exemption can't push your taxable value below what was already on the books. SC Code 12-37-3135(B)(2) says the exemption value may not be less than the current fair market value on the Assessor's books. Using the same $900,000 sale:
- Books show $600,000: 75% of $900,000 is $675,000, which is higher, so the taxable value is $675,000.
- Books show $750,000: 75% of $900,000 is $675,000, which is lower, so the taxable value is held at $750,000. Tax at 6% in district 510: $750,000 x 6% x 249.0 / 1,000 = $11,205.00.
- Books show $950,000 (a sale below the County's value): the exemption doesn't apply, and the sale value is used.
Who has to file the January 31 notice?
The owner, or the owner's agent, of a property that will be taxed at 6%. The statute is plain: the exemption "does not apply unless the owner of the property, or the owner's agent, notifies the county assessor that the property will be subject to the six percent assessment ratio ... before January thirty-first for the tax year for which the owner first claims eligibility" (12-37-3135(C)). After that you don't file again while it stays at 6%. Ask the Beaufort County Assessor's office how it wants the notice made, and keep proof you sent it.
Buyers of second homes and rentals are the ones who lose this most often. If you'll live in the home, you don't need it: apply for the 4% ratio instead, which saves far more. See second-home property tax.
Which transfers don't reset the value?
SC Code 12-37-3150 lists transfers that aren't an ATI, including transfers between spouses or incident to divorce, a deed to a trust whose only present beneficiaries are the owner or the owner's spouse, and an inheritance by a surviving spouse. A new 2026 exclusion matters on Hilton Head: under Act 149 of 2026, a transfer between qualified family members to clear title to heirs' property is not an ATI, as long as the required affidavits are filed with the Assessor. See heirs' property on Hilton Head. If your situation is anything other than a plain sale, ask your closing attorney whether the transfer is an ATI.
The reverse also happens. Selling more than half of an LLC that owns the house is an ATI even though no deed is recorded, and the entity must report it to the Assessor within 45 days.
How we help
Before you offer, we'll pull the value on the County's books and the seller's ratio, and show you what the bill will be the year after closing at both 4% and 6%. If the home will be a second home or rental, we'll remind you and your closing attorney about the January 31 notice.
Questions
Does the 15% cap protect me in the year I buy?
No, the cap doesn't apply to the value set by your purchase. SC Code 12-37-3140(B) excludes the year a transfer value is first taxed. The cap protects you from then on, limiting reassessment increases to 15% in five years until the home sells again.
Do 4% homes get the 25% exemption too?
No, the 25% exemption applies only to property taxed at 6% (12-37-3135(B)). A 4% home doesn't need it, because the lower ratio and the school operating exemption already cut the bill by about two thirds compared with 6%.
What if I start as a second home and later move in?
Apply for 4% for the year the home becomes your legal residence, by January 15 of the following year. A home that's your legal residence for any part of a year gets 4% for the whole year (12-43-220(c)(2)(i)). The value set by your purchase stays in place, subject to the 15% cap.
Sources
- SC Code Title 12 Chapter 37 (12-37-3135, 12-37-3140, 12-37-3150), SC Legislature (checked October 2026)
- 2023 Reassessment Guide, Beaufort County Assessor (checked October 2026)
- Assessor FAQ, Beaufort County Assessor (checked October 2026)
- Millage information and tax year 2026 millage card, Beaufort County Auditor (checked October 2026)
- Information Letter #26-23, 2026 tax legislation (Act 149), SC Department of Revenue (checked October 2026)