Columbia SC Property Tax: Assessment, Exemptions, and Appeals

Columbia SC property tax is calculated by multiplying your home’s fair market value by an assessment ratio (4% if it’s your primary residence, 6% for rentals, second homes, commercial property, and land) and then by the millage rate for your specific tax district. Because Columbia sits in both Richland and Lexington counties, the county your parcel falls in decides who values it, who bills it, and which millage rate applies. For 2025, total millage inside the City of Columbia on the Richland side ran roughly 530 to 581 mills depending on district and school zone. Lexington’s rates run separately.

Check your deed or either county’s online property records to confirm which county your parcel is in before you budget for taxes or challenge a bill. Everything downstream, from the assessor who values the property to the treasurer who cashes your check, depends on that answer.

The 4% Versus 6% Classification

South Carolina taxes real property in classes. If you own and live in the home as your legal residence, only 4% of fair market value is taxable. A $250,000 home assessed at 4% has a taxable base of $10,000.¹

Everything else sits at 6%. Rental houses, vacation homes, commercial buildings, and vacant land are all assessed at the higher ratio, so the same $250,000 property produces a $15,000 taxable base, 50% more than an owner-occupied home.¹

The 4% ratio isn’t automatic. You have to file an application with your county Auditor certifying the property is your legal residence. Skip the filing or miss the window and the county defaults you to 6%. If you convert a rental into a primary home or move out of a house you now rent, update the classification promptly. The wrong ratio can inflate a bill by hundreds of dollars a year.

Act 388: The School Operating Exemption on Owner-Occupied Homes

One of the largest breaks in South Carolina goes unnoticed by many new homeowners. Under Act 388, homes that qualify for the 4% ratio are fully exempt from the school operating portion of the property tax. This is a large slice of total millage, and it applies automatically once your 4% classification is approved.¹

Properties at 6% don’t get this exemption. That’s why the gap between an owner-occupied bill and a rental bill is wider than the assessment ratio alone suggests. A landlord pays on both a higher assessed value and on school operating mills that the neighbor next door avoids entirely.

Homestead Exemption for Seniors, Disabled, and Legally Blind Homeowners

South Carolina exempts the first $50,000 of fair market value from all property taxes on a primary residence if you meet one of three conditions:

You turn 65 on or before December 31 of the tax year and have been a South Carolina resident for at least one year.
A state or federal agency has classified you as totally and permanently disabled. If none has, you can request an evaluation through the state’s Vocational Rehabilitation agency.
You are legally blind under South Carolina law.

Only one spouse needs to qualify on jointly owned property. Apply through your county Auditor by July 15 of the tax year. Applications filed after July 15 but before the first penalty date in January still reduce that year’s taxes. File after the penalty date and the exemption pushes to the following year.²

At the 4% ratio, a $50,000 exemption strips $2,000 off assessed value. Depending on your millage, that’s roughly $1,000 or more a year. Not filing is one of the most expensive oversights among eligible Columbia homeowners.³

A Worked Example

Three numbers drive the bill: fair market value, assessment ratio, and millage rate.⁴

Fair Market Value × Assessment Ratio × Millage Rate = Annual Property Tax

Take an owner-occupied home in the City of Columbia on the Richland side at 530 mills:

Fair market value: $250,000
Assessment ratio: 4% (owner-occupied)
Assessed value: $250,000 × 0.04 = $10,000
Millage rate: 530 mills (one mill equals $1 per $1,000 of assessed value)
Annual tax: $10,000 × 0.530 = $5,300

Now flip that same house to a rental. The 6% ratio raises the assessed value to $15,000, school operating mills come back into the millage, and the bill can easily clear $8,000. The county Assessor sets fair market value. Millage is the combined levies of the county, city, school district, and any special districts covering the parcel. Both numbers appear on the assessment notice mailed after a reassessment or transfer.

Reassessment, the 15% Cap, and the Purchase Reset

Counties reassess every five years, with a one-year extension available by ordinance. Between reassessments, fair market value generally stays put unless you improve the property or it changes hands.⁵

When reassessment hits, state law caps the increase in fair market value at 15% over the five-year cycle. Two situations override the cap: new construction or additions, and an assessable transfer of interest, which is the legal term for a sale. Buy a home between reassessments and the county can reset fair market value to your purchase price no matter how much larger that is than the seller’s old value.⁶

This trips up new buyers. Say you paid $300,000 for a home whose prior assessed fair market value was $220,000. The county can raise the value to match your sale price at the next reassessment, and the tax bill jumps accordingly. Perfectly legal, and worth planning for the moment you close.

Challenging the Assessment

If you think the county overvalued your property, you have 90 days from the date the Assessor mailed the notice to file a written objection. You can challenge the value, the ratio, or both.⁷

In years when no notice is mailed, you can appeal at any time. An appeal filed before January 15 applies to the current tax year. One filed after applies to the next.⁷

The appeals that win are built on comparable sales and factual errors. Recent sales of similar nearby homes below the county’s appraised value carry real weight. So do errors in the property record: wrong square footage, a bathroom that doesn’t exist, a basement counted as finished when it isn’t. What doesn’t work: arguments about how high the tax is, how big the percentage jump was, or how the county spends the money. None of those bear on whether the appraised value is accurate.

Counties use mass appraisal models that value thousands of properties at once from neighborhood trends and generic characteristics. A private fee appraisal from a licensed appraiser looks at your property in detail and can pinpoint where the mass model missed. Residential appraisals typically run $300 to $600, and the math favors ordering one when several years of tax savings would exceed the fee.

Deadlines, Penalties, and the Tax Sale

Bills go out in the fall. Payment is due by January 15 of the following year. If the county mailed notices late, the deadline extends to 30 days after mailing, whichever is later.⁸

Miss January 15 and penalties stack on a fixed schedule:

January 16: 3% penalty added to the unpaid balance.
February 2: an additional 7%.
March 17: a final 5%.

After March 17 the Treasurer issues a tax execution and the debt moves into delinquent collection, which ultimately leads to a tax sale of the property.⁸

One useful exception: if ownership changed during the tax year and the county mailed the bill to the prior owner, the Treasurer must waive penalties for the current owner who never received notice on time.⁸

Both counties accept online payments through their treasurer portals, including cards (with a third-party service fee) and electronic checks. In-person and mailed payments work too; mailed payments are timely based on U.S. postmark. Write your tax map number on the check, keep the receipt, and verify status online after mailing.⁹

If Your Mortgage Escrows Taxes

Most homeowners with a mortgage don’t send a check to the county. The lender collects a share each month, holds it in escrow, and pays the county when the bill is due. Federal Regulation X requires an annual escrow analysis and a statement showing what came in, what went out, and whether the account is short or long.¹⁰

A shortage usually raises your monthly payment for the next year, though some lenders let you pay it as a lump sum. A surplus of $50 or more must be refunded unless you leave it. Lenders can’t hold more than two months of projected disbursements as a cushion. Reassessments and millage changes are the most common reasons escrow payments shift year to year. If your Columbia home just got reassessed at a higher value, expect the escrow line on your mortgage to rise the following year.

Federal Deduction and the SALT Cap

Real estate taxes paid to South Carolina and its local governments, including the amounts paid through escrow, are deductible on your federal return if you itemize. Charges for specific services (trash pickup), special assessments that improve your property (sidewalks), and transfer taxes are not deductible.¹¹

The federal SALT cap limits how much of your combined state income taxes and property taxes you can actually deduct. For the 2026 tax year, the base cap is $40,000 (roughly $40,400 after the annual 1% adjustment), half that for married filing separately. The cap phases down for taxpayers with modified adjusted gross income above $500,000, reaching a $10,000 floor. Anything above the applicable cap yields no federal benefit.

1
South Carolina Legislature. South Carolina Code 12-43-220 – Classifications Shall Be Equal and Uniform
2
South Carolina Legislature. South Carolina Code 12-37-250 – Homestead Exemption for Taxpayers Sixty-Five and Over or Those Totally and Permanently Disabled or Legally Blind
3
South Carolina Department of Revenue. Local Government Services
4
South Carolina Revenue and Fiscal Affairs Office. Property Tax FAQ
5
South Carolina Legislature. South Carolina Code Title 12 Chapter 37 – Assessment of Property Taxes
6
South Carolina Legislature. South Carolina Code Title 12 Chapter 37 – Assessment of Property Taxes – Section 12-37-3140
7
South Carolina Legislature. South Carolina Code 12-60-2510 – Property Tax Assessment Notices and Objections
8
South Carolina Legislature. South Carolina Code Title 12 Chapter 45 – Collection of Taxes – Section 12-45-180
9
Richland County Treasurer. Richland County Tax Information
10
Consumer Financial Protection Bureau. 12 CFR 1024.17 – Escrow Accounts
11
Internal Revenue Service. Publication 530 – Tax Information for Homeowners