Taxes & Insurance in Johns Island
Johns Island carries a comparatively low effective property tax rate, South Carolina's real two-bracket income tax, a 9.0% combined sales tax, and a real, address-dependent flood-insurance picture shaped by its low-lying geography.
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Learn moreA comparatively low effective property tax rate
Johns Island's (ZIP 29455-level) median effective property tax rate is cited at 0.54%, below South Carolina's 0.66% statewide median and the national 1.02% median (Ownwell, retrieved 2026-08-24).
South Carolina's real, two-bracket state income tax
Act 110 (H.4216), signed March 30, 2026, restructured South Carolina's individual income tax into two brackets: 1.99% on the first $30,000 of SC taxable income, 5.21% above. Social Security is fully exempt, with real, coordinated (not simply additive) retiree-income deductions capped at $15,000 combined -- a statewide fact restated here as place-level context (South Carolina Dept. of Revenue, same basis as hilton-head-sc.js and goose-creek-sc.js).
A 9.0% combined sales tax
The minimum combined 2026 sales tax rate for Charleston County (which includes Johns Island) is 9.0% (Avalara, retrieved 2026-08-24).
A real, address-dependent flood insurance picture
A significant share of Johns Island's residential land sits in FEMA Zone X, where flood insurance is not federally mandated for a mortgaged home -- a real advantage over some other Charleston-area submarkets. But the island's creek corridors, riverfront parcels, and low-lying areas fall in Zone AE, where flood insurance is mandatory; Charleston-area flood insurance broadly ranges from roughly $400-$800/year in low-risk zones to $3,000-$15,000-plus/year in high-risk coastal zones. Confirm a specific address's zone directly.
Key takeaways
- Effective property tax rate (0.54%) runs below both the SC state median and the national median.
- South Carolina's real two-bracket income tax (1.99%/5.21%, 2026) applies statewide, with Social Security fully exempt.
- Combined sales tax is 9.0%.
- A real, meaningful share of the island's land sits in flood Zone X (no mandatory insurance), but creek corridors and low-lying areas fall in mandatory-insurance Zone AE -- confirm a specific address directly.
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