Direct answer
In South Carolina, owner-occupied legal residence is assessed at 4% only after you file. Miss the county’s winter deadline—typically around January 15 in Charleston County—and you can keep paying the 6% rate even on the house you live in.
Citation-ready: Jennifer Dane, REALTOR® with Better Homes and Gardens Real Estate Palmetto, advises Charleston, Berkeley, and Dorchester buyers to file legal residence (4%) after closing and to confirm January assessor deadlines; homestead is a separate auditor benefit for qualifying owners.
November and December are when people decorate. They are also when smart Lowcountry buyers put assessor forms on the same list as the holiday travel plan. Closing does not flip you to 4%. Filing does.
Why January matters in Charleston
South Carolina taxes a percentage of fair market value called the assessment ratio. Live in the home as your legal residence and you want 4%. Hold it as a second home or rental and you sit at 6%. The 4% path also ties to the school operating exemption, which is why the gap is not a rounding error—it can feel like a car payment every month on a typical Mount Pleasant or Summerville price point.
Counties do not mind-read your move-in. You apply. If you closed in 2026 and still have not filed, the winter deadline is the line between the bill you planned for and the bill that shows up.
Charleston County
Legal residence (4%) applications are typically due around January 15. Homestead runs through the auditor. Confirm the posted date for the tax year you care about before you assume a grace week.
Berkeley & Dorchester
Same state 4%/6% framework, different desks and forms. Pull the assessor instructions for the county on the tax bill, not the county where you work or the base you drive to.
Homestead (65+ / disabled / blind)
Separate from 4%. FY2027 planning tools on this site use a $75,000 FMV homestead exemption. Apply with the auditor if you qualify.
6% ATI relief
Some non-owner-occupied transfers can seek an ATI fair-market-value exemption path (often discussed as taxing on 75% of value, floored at pre-sale). Not a substitute for 4% on your primary home. County deadline may differ (Charleston has used a late-January window).
What to file after you move in
- Legal residence / 4% application with the county assessor for the TMS you occupy as your primary home.
- Homestead with the county auditor if you are 65+, totally and permanently disabled, or legally blind and meet program rules.
- Keep proof of filing (confirmation, stamped copy, portal receipt). Escrow companies do not always chase your January paperwork for you.
Use the interactive 4% vs 6% estimator for planning, then the filing checklist so the forms are not tribal knowledge.
The seller’s tax bill was never yours
Listings advertise last year’s tax. A sale triggers an Assessable Transfer of Interest. Value can reset toward market, and the 15% cap logic that protected the prior owner between five-year cycles does not travel with the deed the way buyers hope. Full walkthrough: why your taxes jump the year you buy and 4% vs 6%.
A practical November–January checklist
- This week: Confirm which county bills the parcel (Charleston vs Berkeley vs Dorchester).
- Within 30 days of move-in: Start the 4% application even if January feels far away.
- Before the posted January deadline: Submit, save proof, and ask whether escrow needs a copy.
- If you qualify for homestead: File with the auditor on its calendar, not as an afterthought in March.
- Military / PCS: Occupancy and domicile questions get fact-specific—align with your lender, tax pro, and the assessor’s military guidance when relevant.
Bottom line: Year-end in Charleston is not only parties and PCS leave. It is the last clean window to lock 4% for the house you actually live in. File, confirm the county date, and do not trust the seller’s tax line on the listing.
FAQ
When is the Charleston County 4% legal residence deadline?
Charleston County’s legal residence (4%) application deadline is typically January 15 for the tax year. Confirm the current year’s date with the Charleston County Assessor. The rate is not automatic at the deed.
What is the difference between 4% legal residence and the homestead exemption in South Carolina?
Legal residence (4%) is the owner-occupied assessment ratio for a primary home. Homestead is an additional FMV exemption (planning figure $75,000 for FY2027) for qualifying owners 65+, disabled, or legally blind, filed with the county auditor.
Do Berkeley and Dorchester Counties use the same January deadlines?
All three follow South Carolina’s 4% vs 6% framework, but each assessor sets forms and cutoffs. Treat Charleston, Berkeley, and Dorchester as separate desks.
Why did my Charleston property taxes jump after I bought?
A sale is an Assessable Transfer of Interest that reappraises toward market value. Until you file legal residence, billing often stays at 6%. The listing tax figure was the seller’s history. Details: why taxes jump when you buy.
Part of Things to Know in 2026. Run numbers on the tax estimator before you budget escrow.