Many homeowners believe that once they sign their closing documents, choose an insurance company and begin making payments, their monthly mortgage payment is settled. That may be true for the principal and interest portion of a fixed-rate mortgage, but it is not necessarily true for the total amount withdrawn from the homeowner's bank account each month.

Property taxes, homeowners insurance and escrow shortages can all change the total monthly payment. A homeowner who overlooks a letter from the county, insurance company or mortgage servicer may discover the problem only after the payment has increased.

South Carolina's 4% Legal Residence Assessment

South Carolina provides a 4% property-tax assessment ratio for an owner's qualifying legal residence. Other residential real estate generally receives a 6% assessment ratio. A home is not officially labeled an "investment property" simply because an application has not been completed, but the property will not receive the valuable 4% legal-residence treatment until the homeowner applies and the county assessor approves the application.

The difference can be much greater than two percentage points would suggest. A qualifying legal residence may also receive relief from school operating property taxes, making the difference between the 4% and 6% tax bills substantial.

South Carolina law requires the owner or the owner's agent to apply before the first penalty date for the tax year in which the owner first claims eligibility. In most Lowcountry counties, that date is generally January 15 of the following year—not October. Still, homeowners should apply as soon as they have the documents required by their county rather than waiting until a tax bill arrives.

The documents requested can vary by county. Charleston County's April 2026 application requests South Carolina identification, vehicle registrations, voter-registration information and portions of federal and state tax returns for owner-occupants and a spouse. The county may request additional documentation when necessary. Homeowners should therefore obtain the current application from their own county instead of depending on a checklist they received several years ago.

Ownership arrangements also matter. It is not always accurate to say that every person whose name appears on the deed must occupy the property. However, a non-occupying co-owner, family ownership arrangement, trust, life estate or limited-liability company can affect how the exemption is approved and whether it applies to the entire property. Those situations should be discussed directly with the assessor's office.

A Refinance Does Not Automatically Cancel the 4% Rate

A normal refinance replaces or restructures the mortgage debt. It does not ordinarily change who owns the property. The same is generally true when a homeowner opens a home-equity line of credit. Those loan transactions alone should not automatically cause the county to remove the 4% legal-residence assessment.

A new application may be required, however, when ownership or use changes. Examples can include adding or removing an owner through a deed, creating certain trust or life-estate arrangements, transferring the home, or changing it from a primary residence to a rental or second home. State law requires an owner to notify the assessor within six months after a change in ownership or use. Berkeley County specifically advises homeowners to apply again after changes such as adding or removing an owner, establishing a trust or life estate, or following an owner's death.

A refinance can still create a different problem. The county's mortgage records may continue showing the former lender or servicer. Charleston County advises homeowners who refinance to forward the tax bill to the current mortgage holder so the bill can be paid from the correct escrow account.

That is why it is wise to look up the property record after a closing, refinance or deed change. Confirm the owner names, mailing address, assessment ratio and mortgage information instead of assuming every office received the same information automatically.

Homeowners Insurance and Force-Placed Coverage

The account commonly used by a mortgage servicer to pay property taxes and homeowners insurance is an escrow account. It is not normally a home-equity line. Part of each monthly mortgage payment is deposited into escrow, and the servicer uses that money to pay the bills when they become due.

When changing insurance companies, homeowners should make sure the new policy contains the correct mortgagee information and that the mortgage servicer receives proof of coverage. Do not assume the insurance agent and mortgage company successfully exchanged every document.

When a servicer believes insurance has expired, been canceled or does not satisfy the loan requirements, it may purchase force-placed insurance and charge the borrower. Force-placed coverage is usually more expensive than a policy purchased directly by the homeowner, and it may primarily protect the lender rather than the homeowner. Federal servicing rules generally require the servicer to provide at least 45 days' warning before charging for the coverage.

Receiving one of these notices does not necessarily mean the homeowner is uninsured. It may mean the servicer did not receive the renewal declaration, the mortgagee information is incorrect or the old carrier sent a cancellation notice before the new carrier's information arrived.

The homeowner should contact both the insurance agent and the mortgage servicer immediately, send proof of coverage, request cancellation of any unnecessary force-placed policy and keep confirmation that the documents were received.

Why an Escrow Shortage Can Increase the Payment Twice

When property taxes or insurance premiums increase, the escrow portion of the mortgage payment must also increase. If the servicer has already paid a larger bill than expected, the account may also have a shortage.

That can make the increase feel especially painful. The homeowner may be paying one amount to cover the higher bills expected during the coming year and another amount to repay the previous shortage. Federal rules generally allow a servicer to collect many escrow shortages through monthly payments spread over at least 12 months.

This is one reason an incorrect 6% property-tax bill can continue affecting the household even after the county corrects the classification. The county must process its correction, and the servicer must then receive the corrected information and perform the necessary escrow review.

Until the mortgage servicer issues a corrected payment amount or another written arrangement, a homeowner should not simply continue paying the old amount. Paying less than the amount shown as due can create a delinquency. Keep records of telephone calls, confirmation numbers, uploaded documents, emails and letters until the account is corrected.

Do Not Ignore the Mail

It is easy to put official-looking envelopes aside, especially when most correspondence looks like advertising. But notices concerning property taxes, insurance, escrow and mortgage servicing deserve attention.

I once found a drawer containing several years of unopened mail. We joked that there could have been a million-dollar check hidden inside, but the truth is less funny. There could also have been a tax notice, an insurance cancellation, a refund check, an escrow statement or a deadline that had already passed.

Open correspondence from:

• The county assessor, auditor or treasurer
• Your homeowners insurance company
• Your mortgage lender or servicer
• Your closing attorney
• Your homeowners association
• Any company identifying an escrow shortage or coverage problem

A letter does not always mean something is wrong. It may simply give you the opportunity to prevent something from becoming wrong.

Check the County's Square Footage and Property Record

The square footage shown in the MLS, a previous appraisal and the county property record may not be identical. Each source can use different information or measurement standards. A difference does not automatically prove that the tax assessment is incorrect.

However, homeowners should review the county property record for obvious errors, including incorrect building size, features that do not exist, an addition that was removed or spaces that should not have been classified in the way shown.

A professional measurement or floor plan can be useful evidence, but it does not automatically require the county to lower the value or issue a refund. The homeowner must submit a written objection or appeal to the county assessor and show why the assessment is incorrect. South Carolina law imposes deadlines on valuation appeals, and refunds for valuation errors generally depend upon the homeowner having followed the required appeal procedure.

In a year when the county sends a new assessment notice, the owner generally has 90 days from the mailing of that notice to object. In a year without a new assessment notice, an owner may submit an appeal at any time, but an appeal submitted after the first tax-penalty date generally applies to the following tax year.

If the assessor agrees that an error occurred, the assessment can be corrected. If taxes were overpaid and the legal requirements for a refund were satisfied, the overpayment may be refunded with applicable interest. Reimbursement is possible, but it should never be promised before the county reviews the evidence and applicable deadlines.

Five Records Every Homeowner Should Review

At least once each year, and after any refinance, insurance change, deed change or major improvement, homeowners should review:

1. The county property record and assessment ratio
2. The annual property-tax bill
3. The homeowners insurance declaration page
4. The mortgage escrow analysis
5. The itemized monthly mortgage statement

The most important lesson is not that mistakes are inevitable. It is that small errors are usually easier to correct when they are discovered early.

Call the county assessor about the 4% legal-residence classification or property record. Call the mortgage servicer about escrow or payment changes. Call the insurance agent about coverage. Contact the closing attorney when a deed or ownership question is involved.

A Realtor can help homeowners recognize the issue and find the proper office, but the county, insurer and mortgage servicer must make the final decisions and corrections.

Paying attention now is usually much easier than spending several months trying to recover money after every system has already acted on incorrect information.

This article provides general educational information. Tax, insurance and mortgage procedures can vary by county, lender, policy and individual circumstances.

Bonnie Wicks, licensed as Bonnie Jean Wicks Bertalot, is an Associate Broker with Carolina One Real Estate serving Mount Pleasant, Charleston and surrounding Lowcountry communities.