South Carolina Rental Property Taxes: What Investors Actually Pay in 2026
Program and regulatory figures verified July 24, 2026. Details change; confirm your scenario with us.
South Carolina's investor tax story is not "low taxes." It's a 6% assessment ratio, a point-of-sale reassessment on every purchase, one optional election that softens it, and a brand-new income-tax law most sites haven't caught up to.
The 6% ratio, in depth
South Carolina applies a millage rate not to full value but to an "assessed value," which is a statutory percentage of fair market value. For an owner-occupied legal residence that percentage is 4%, and the property also escapes school-operating taxes. For every rental, second home, and investment property, the percentage is 6% and there is no school-operating exemption. The gap between those two positions is why an investor's bill on the identical house routinely lands at 2.5 to 3 times an owner-occupant's: the ratio alone is 1.5x, and the lost exemption widens it. The narrative version, with a worked example, is on the 6% tax trap page; this page is the mechanics.
What is an ATI and how does the 25% exemption work?
An Assessable Transfer of Interest is the event that resets your taxable value. When 6%-ratio property changes hands, the county reassesses it to current fair market value, so your first-year taxable value reflects what you paid, not the seller's older assessment. Under §12-37-3135 the purchaser may claim an exemption equal to 25% of that ATI fair market value, though the exemption-adjusted value cannot fall below current fair market value. The critical operational fact: this is an election, not automatic. You file the ATI exemption election with the county assessor, generally by late January of the first tax year (counties differ on the exact day, so treat it as late January and confirm yours), or you forfeit the benefit for that year. A change of use that shifts the assessment ratio can preclude it. This is a your-CPA-and-assessor item, and we flag the filing window on every purchase.
Does South Carolina cap how much my rental's taxes can go up?
Only partially, and not the way a homestead is protected. Under §12-37-3140, any increase in fair market value attributable to the periodic countywide reassessment program is capped at 15% within a five-year period, calculated on land and improvements as a whole. But the cap does not apply in the year an ATI transfer resets the value, and it is removed and reset the year after an ATI occurs or new improvements are made. So the sequence for an investor is: you buy, the property gets a fresh ATI-reassessed value (reducible by the 25% election), and then the 15%-per-five-years cap governs increases only until the next transfer. You never get the ongoing, homestead-style protection an owner-occupant enjoys. Plan your hold-period tax trajectory accordingly.
How taxes compare across counties
The 4%-versus-6% mechanics are statewide statute, so the multiplier is consistent whether the property sits in Charleston, Horry, Greenville, or Richland County. What differs county to county is the millage rate applied to that assessed value, so the absolute dollar bill on the same-priced house varies, but the investor-versus-owner-occupant gap scales with each county's millage rate rather than changing shape. That's why we quote the 2.5-to-3x multiplier as the reliable rule and then rebuild the actual dollar figure using the specific county's current millage before you underwrite. The DSCR ratio uses that real number: how the ratio works.
The income-tax reform (H.4216), an aside worth its own line
This is the freshest correction on the site. Governor McMaster signed H.4216 on March 30, 2026, effective tax year 2026, replacing the old graduated schedule with two rates: 1.99% on taxable income up to $30,000 and 5.21% (minus a $966 offset) on income above $30,000. It kills two stale claims at once, the old top rate that had been stepping down from 6.5%, and a widely-repeated "flat 3.99%" headline that was never the enacted structure. Future automatic step-downs are possible if the state's Board of Economic Advisors certifies at least 5% year-over-year individual-income-tax revenue growth. Rental income flows onto your South Carolina return, so this rate matters to your after-tax yield; your CPA files at the enacted figure. Deed recording, meanwhile, runs $1.85 per $500 of price, customarily seller-paid, functioning as the state's transfer fee.
No pressure, no obligation, and no salesy follow-up: a 20-minute call with our team, real numbers, and a straight answer on whether the deal pencils.
Frequently asked questions
What is an ATI (Assessable Transfer of Interest) in South Carolina?
It's the point-of-sale reassessment that occurs whenever 6%-ratio property changes hands: the county resets the taxable value to current fair market value, so your first-year value reflects what you paid, not the seller's older assessment. It's the trigger event that resets a rental's taxable value after every purchase, and it's what the 25% exemption election works against.
Does South Carolina cap how much my rental's taxes can go up each year?
Only partially. The 15% within a five-year period reassessment cap (§12-37-3140) applies between sales, but it does not apply in the year of an ATI transfer and resets the year after every transfer or new improvement. Investment property gets no ongoing protection comparable to a homestead, so model your hold-period taxes without homestead-style relief.
How do property taxes compare across South Carolina counties for investors?
The 4%-versus-6% mechanics are statewide statute, so the investor-versus-owner-occupant multiplier is consistent in Charleston, Horry, Greenville, and Richland alike. What differs is the millage rate applied to the assessed value, so the dollar gap scales with each county's millage rate while the 2.5-to-3x multiplier stays reliable. We rebuild the real dollar figure per county before underwriting.
Did South Carolina change its income tax in 2026?
Yes. H.4216, signed March 30, 2026 and effective tax year 2026, set two rates: 1.99% on taxable income up to $30,000 and 5.21% (minus a $966 offset) above it. That replaces the old graduated schedule and overrides both the stale 6.x% top rate and a widely-repeated 'flat 3.99%' claim. Rental income flows onto your SC return; your CPA files at the enacted figure.
Mike Certo · NMLS #260555 · Cornerstone First Mortgage NMLS #173855 · Equal Housing Lender. Educational content, not a loan commitment and not legal or tax advice. City STR rules, tax figures, and filing deadlines change; verify current requirements with the city or county, your CPA, or a South Carolina real estate attorney before you buy. Loans are subject to buyer and property qualification.