Property Taxes in Charleston (SC)

1. How South Carolina property tax actually works

South Carolina taxes real property through a purely local, county-based ad valorem (per-value) system. Charleston, Berkeley, and Dorchester counties each elect or appoint their own County Assessor, who determines a property's fair market value; that value is then multiplied by an assessment ratio to produce the taxable assessed value, and the assessed value is multiplied by the local millage rate (Section 5) to produce the actual bill. South Carolina's assessment ratio isn't a single statewide number — it depends on how the property is used: an owner-occupied primary residence (the owner's "legal residence") is assessed at 4% of fair market value, while everything else — second homes, rental property, most LLC-owned property, and commercial real estate — is assessed at 6%. Every property defaults to the 6% ratio the moment it changes hands; a new owner has to actively apply for the 4% ratio (Section 2) to get the lower rate (Nat Wallen).

South Carolina's overall tax structure leans on property tax less than many states: the statewide average effective property tax rate on owner-occupied housing is 0.49% of home value, well below the national average, alongside a 6.00% state sales tax (7.49% average combined with local option taxes) and a graduated income tax topping out at 5.21% (Tax Foundation). See our relocating guide for the fuller income- and sales-tax picture.

2. The legal residence (4%) exemption: qualifying and applying

The 4% ratio applies under South Carolina Code §12-43-220(c) to a home that's actually the owner's legal residence — occupied by the owner, not a rental, second home, or investment property — and it has to be applied for, not assumed. State law sets the deadline in one specific way: the application must be filed before the first penalty date for the payment of taxes for the tax year for which the owner first claims eligibility (S.C. Code §12-43-220(c)(2)(ii)). In practice that penalty date is typically January 15 of the year following a purchase, per Charleston County's own guidance, but it's the statute's "first penalty date" language, not a fixed calendar date, that actually controls — confirm the exact date for a given tax year with the county.

Charleston County's own application (Form LegalRes4) has to be mailed or hand-delivered to the Assessor's Office at 4050 Bridge View Drive, Suite 100, North Charleston, SC 29405 (no fax or email — an original signature is required), or filed through the county's online tax-forms portal. Required documentation for every owner and spouse includes an SC driver's license or ID showing the property's address, SC vehicle registration and voter registration at that address, and the first two pages of the owner's federal Form 1040 (plus Schedule 1, C, E, and Form 8829 where applicable) with sensitive information redacted (Charleston County Assessor). Berkeley and Dorchester counties run the same underlying state program through their own Assessor's Office paperwork; Dorchester County's version is its own "4% Legal Residence Application," filed with that county's Assessor (Dorchester County).

3. Act 388: the school-operating exemption

This is South Carolina's own version of a structural break for owner-occupants, and it works differently from a typical homestead exemption elsewhere: rather than discounting the assessed value or capping a millage rate, the 2006 Act 388 exempted 100% of the fair market value of an owner-occupied residence from property tax levied for school operating purposes, on top of the 4% assessment ratio itself. Other components of the bill — school bonds/debt service, county operating millage, county bonds, municipal millage, and special-district millage — are unaffected and still apply to an owner-occupied home. To replace the lost school-operating revenue, Act 388 raised the state sales tax by one percentage point starting June 1, 2007 (to the current 6% state rate), with the new revenue credited to a Homestead Exemption Fund that reimburses school districts and counties directly; the same act cut the sales tax on unprepared groceries from 5% to 3% (No Home Tax).

Because school operating millage is typically the single largest component of a South Carolina property tax bill, this exemption — stacked on top of the 4% assessment ratio — is the main reason an owner-occupied home's bill runs dramatically lower than a 6%-assessed rental or commercial property of the same value, not just the lower assessment ratio on its own.

4. The 15% assessment cap and point-of-sale reassessment

State law requires every South Carolina county to conduct a countywide reassessment at least every five years. Between reassessments — and within a reassessment cycle, for a property that hasn't changed hands — a property's assessed value can't rise by more than 15% since the last reassessment or the last "assessable transfer of interest" (ATI), whichever is more recent. That cap is a limit on how much the assessed value used to calculate the bill can climb, not a limit on the tax bill itself: a county, school district, or municipality can still raise its own millage through ordinary budget action, which raises the bill independent of the cap (Post and Courier).

A sale (or another qualifying ownership change) is an ATI, and it resets the cap: the county reassesses the property to the purchase price or current fair market value as of the transfer, and that new figure becomes the base the 15% cap applies against going forward — the "point-of-sale reassessment" that produces a real gap between a longtime owner's bill and a next-door neighbor who just bought at today's price (AskDoss). Berkeley County's 2024 reassessment is a concrete illustration of how binding the cap can get: the county projected 18% average growth in real property values, and roughly 70% of its 130,000 parcels were capped at the full 15% — meaning actual appreciation for most properties exceeded the cap and the assessed value could only rise as far as state law allowed (Berkeley County).

Each county runs its own five-year clock. Charleston County's most recent reassessment took effect for 2025, based on values as of December 31, 2023, following its prior 2020 reassessment — its next reassessment is due in 2030, and property owners had until November 18, 2025 to formally object to the new 2025 values (Post and Courier). Berkeley County's most recent reassessment took effect for 2024, following its prior 2019 reassessment, with notices mailed June 22, 2024 and an appeal deadline of September 20, 2024 — its next reassessment is due in 2029 (Berkeley County). Dorchester County reassesses on the same statewide five-year schedule; confirm its current cycle year directly with the Dorchester County Assessor's Office (Dorchester County).

5. Millage rates in Charleston, Berkeley & Dorchester counties

A South Carolina property tax bill is rarely one clean number: it sums the county's own base millage, school-district millage (skipped entirely for an owner-occupied home under Act 388, Section 3), municipal millage if the property sits inside a city or town, and any special-purpose district millage (fire protection, water/sewer, road maintenance, and similar). The South Carolina Association of Counties' own countywide figures below are the county base millage only — the piece levied for county government itself — not a full combined bill:

Municipal millage layers on top of the county figure inside city limits. Representative city/town millage from the same source: Charleston 81.9–82.0 mills (the rate differs slightly depending on which county a given parcel of the city falls in), North Charleston 91.5 mills, Mount Pleasant 44.3 mills, Summerville 66.0 mills, Goose Creek 60.0 mills, Hanahan 77.4 mills, Moncks Corner 73.8 mills, Folly Beach 32.5 mills, and Isle of Palms 20.1 mills (South Carolina Association of Counties). None of these municipal figures include the county base millage above or any special-purpose district millage that might also apply — they have to be added together for a real total, and that total still excludes school operating millage for a qualifying owner-occupied home under Act 388.

For a comparable statewide figure rather than a raw millage number, South Carolina's average effective property tax rate on owner-occupied housing — tax paid as a share of home value, after the 4% ratio and the Act 388 exemption are already applied — is 0.49%, among the lower effective rates in the country (Tax Foundation). A specific address's actual combined millage depends on exactly which taxing districts it sits inside; Berkeley County publishes an online tax estimator, and each county's Auditor can confirm the current combined rate for a specific parcel (Berkeley County).

6. The Homestead Exemption: relief for seniors, disabled & blind homeowners

Separate from the 4% legal-residence ratio and the Act 388 school exemption, South Carolina runs a third program specifically for qualifying owner-occupants: the Homestead Exemption under S.C. Code §12-37-250, which exempts the first $50,000 of a legal residence's fair market value from property taxes entirely — state, county, school, and municipal alike. It isn't income-tested; eligibility as of December 31 of the preceding year instead turns on holding full ownership (fee simple title or a life estate) in the home, having been a South Carolina legal resident for at least one calendar year, and being age 65 or older, certified totally and permanently disabled by a state or federal agency, or legally blind as certified by a licensed ophthalmologist (Berkeley County Auditor).

Unlike a legal-residence application, the Homestead Exemption is administered by each county's Auditor, not the Assessor. Charleston County residents can apply online or by paper through the Auditor's Office (Charleston County Auditor); Berkeley County's Auditor's Office takes applications at its Moncks Corner, Charleston, and St. Stephen locations (Berkeley County Auditor); Dorchester County's Auditor's Office runs the same program (Dorchester County Auditor).

This exemption amount is also actively being debated in Columbia: the South Carolina Senate passed S.768 by a 44-0 vote on February 19, 2026, which would triple the exemption to $150,000 while extending the residency requirement from one year to five years; as of this page's last review, the bill was still pending in the House Ways and Means Committee, not yet law. Confirm the current exemption amount and residency requirement directly with a county Auditor rather than assuming either the $50,000 figure or the one-year residency rule above still applies by the time a specific application is filed (South Carolina Legislature).

7. Appealing your assessment

South Carolina runs one statewide appeal framework, with each county administering its own deadlines and hearings within it: a property owner files a written objection with the county Assessor within 90 days of the date an assessment notice was mailed (or, in a non-reassessment year, before the first penalty date). The Assessor schedules a conference, and if the disagreement isn't resolved there, the taxpayer can escalate in writing to that county's own Board of Assessment Appeals, and from there to South Carolina's Administrative Law Court (AppealDesk).

Charleston County: contact the Assessor's Office at 4050 Bridge View Drive, Suite 100, North Charleston, SC 29405, (843) 958-4100. During the countywide 2025 reassessment, the deadline to formally object to the new values was November 18, 2025 — a deadline set by that reassessment year's own notice, not a fixed date every year (Post and Courier).

Berkeley County: a written objection is due within 90 days of an assessment notice reflecting a value increase of $1,000 or more, or the right to appeal is forfeited. The Assessor holds a conference within 30 days of the objection; an unresolved case can proceed in writing to Berkeley County's Board of Assessment Appeals and then to the Administrative Law Court. Contact Real Property Services at 1003 Highway 52, Moncks Corner, SC 29461, (843) 719-4061 (Berkeley County).

Dorchester County: a written appeal is due within 90 days of the assessment notice's mailing date, filed with the Assessor's Office at (843) 563-0100. The county specifically advises against waiting for the tax bill itself to arrive, since the 90-day appeal window will typically have already closed by then (Dorchester County).

In any of the three counties, the strongest evidence in an appeal is usually recent comparable sales and, where the disputed value is large enough to justify the cost, an independent professional appraisal.

8. How we keep this page current

The structural mechanics in Sections 1 through 4 — the 4%/6% assessment-ratio system, the legal-residence application requirement, the Act 388 school-operating exemption, and the 15% assessment cap with point-of-sale reassessment — are settled South Carolina law and don't change often. The millage figures in Section 5 reflect the South Carolina Association of Counties' own most recent published report but are reset by each county, city, and special district on its own annual budget cycle, so they drift over time by design. Two things are flagged rather than guessed at: Dorchester County's current reassessment-cycle year, which wasn't pinned to a specific year the way Charleston's and Berkeley's were (Section 4), and the pending S.768 homestead-exemption expansion, which had passed the Senate but not the House as of this page's last review (Section 6) — both worth a direct check with the relevant county office before relying on this page for a specific filing. If you spot something on this page that's changed, or notice a broken link, we'd like to know — see our contact information.