Taxes & Insurance in Irmo
Irmo's tax picture is genuinely shaped by its two-county footprint -- a real, address-dependent sales tax split -- layered on South Carolina's statewide two-bracket income tax and roughly 0.51% average effective property tax rate.
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Learn moreSales tax genuinely differs by county portion
Irmo's Richland County portion carries an 8.00% combined sales tax rate (6% state + 1% county + 1% special district); its Lexington County portion carries a lower 7.00% rate (6% state + 1% special district, with no separate county-wide component). Confirm which portion a specific address sits in before budgeting.
South Carolina's real, current two-bracket income tax
Act 110 (signed March 30, 2026) set two brackets for tax years after 2025: 1.99% on the first $30,000 of taxable income, 5.21% above that. Social Security income is fully exempt, and the age-65 and retirement-income deductions are coordinated (not additive), capped at $15,000 combined -- the same statewide mechanics documented in south-carolina.js, restated here as place-level context.
Property tax runs at South Carolina's low statewide average
South Carolina's statewide average effective property tax rate is roughly 0.51%, among the lower rates nationally -- a real, genuine advantage restated from south-carolina.js as place-level context rather than an Irmo-specific finding.
A real, disclosed structural hazard with insurance implications
Irmo sits immediately downstream of the Lake Murray Dam (Dreher Shoals Dam, completed 1930), and published dam-safety analysis found it would likely fail in a repeat of the 1886 Charleston earthquake, with Irmo specifically identified in Dominion Energy's own evacuation planning as the area hit first. This is a genuine, disclosed structural-engineering risk distinct from the coastal hurricane framing that doesn't apply to this inland market -- worth understanding when evaluating flood-adjacent insurance coverage here.
Key takeaways
- Combined sales tax genuinely differs by address: 8.00% in Irmo's Richland County portion, 7.00% in its Lexington County portion.
- South Carolina's Act 110 two-bracket income tax (1.99% under $30,000 taxable income, 5.21% above) applies statewide, with Social Security fully exempt and a coordinated, $15,000-capped age-65/retirement-income deduction.
- South Carolina's roughly 0.51% statewide average effective property tax rate is a genuine, low-tax advantage.
- The Lake Murray Dam sits immediately upstream, with published analysis finding it could fail in a repeat of the 1886 Charleston earthquake -- a real, disclosed hazard worth weighing in any insurance/risk evaluation, distinct from coastal hurricane risk this inland market does not carry.
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