Taxes in Mount Pleasant
South Carolina's real, two-bracket Act 110 income tax (1.99%/5.21%) applies to Mount Pleasant residents the same as statewide, layered with a 9.0% combined sales tax and Charleston County's real, if disputed-in-exact-figure, comparatively low effective property tax rate.
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Learn moreSouth Carolina's Act 110 income tax -- restated as place-level context
Act 110 (H.4216), signed March 30, 2026, restructured South Carolina's income tax from three graduated brackets into two, effective for tax year 2026: 1.99% on the first $30,000 of SC taxable income, 5.21% above that. This is neither a no-income-tax state nor a flat-rate state -- a genuine two-bracket graduated structure.
Mount Pleasant's 9.0% combined sales tax
Mount Pleasant's combined sales tax rate is 9.0% as of April 2026 -- 6% state plus 3% in local/special-district components, matching Charleston's own combined rate given both sit within Charleston County's local-option and transportation special-district structure.
Property tax: a real, if disputed, bright spot
Charleston County's average effective property tax rate carries a real, disclosed disagreement across sources: approximately 0.32% per one citation versus 0.53% per another -- either way, below the SC statewide median of 0.66% and a real, structural offset to the area's elevated insurance costs. South Carolina's 4% owner-occupied assessment ratio and Act 388 school-operations millage exemption apply here.
Social Security exempt; retiree deductions are coordinated, not additive
South Carolina does not tax Social Security income at all. Residents 65+ get real, but coordinated rather than simply additive, deductions -- the honest combined ceiling for a single 65+ filer runs to $15,000 total. See retiring for the fuller mechanics.
Key takeaways
- South Carolina's Act 110 two-bracket income tax (1.99% under $30,000 SC taxable income, 5.21% above) applies to Mount Pleasant residents same as statewide.
- Mount Pleasant's combined sales tax is 9.0% (6% state + 3% local/special-district).
- Charleston County's effective property tax rate is a real, disputed bright spot (0.32%-0.53% depending on source), well below the SC state median either way.
- Social Security is fully exempt; the age-65/retirement-income deduction combination is coordinated and capped at $15,000 for a single 65+ filer, not simply additive.
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