Charleston and Lowcountry Mortgage Hub: 4% Tax Ratio, Flood Zones and 2026 Loan Limits — Palmetto Passage
Updated October 2026
A Charleston-area mortgage budget needs more than a purchase price and interest rate. Across Charleston, Berkeley and Dorchester counties, occupancy classification, flood exposure and insurance deductibles can change the monthly payment substantially. Palmetto Passage helps buyers organize those costs before comparing homes downtown, inland or along the water.
Start with the loan amount, not the listing price
The 2026 baseline conforming loan limit is $832,750 statewide for a one-unit property. A home priced above that figure can still fit conforming financing when the down payment brings the mortgage within the limit. Check FHFA Loan Limits when establishing your financing range.
FHA follows a separate county-based schedule. The Charleston-North Charleston metro has an elevated FHA limit above the $541,287 national floor; use HUD FHA Mortgage Limits to confirm the property's county and unit count rather than assuming the conforming ceiling applies.
Compare scenarios using today's rates, then build an ownership budget with the monthly payment calculator.
Make the 4% classification a closing priority
South Carolina's Act 388 framework gives qualifying owner-occupied primary residences a 4% assessment ratio and a 100% exemption from school operating taxes. Second homes and investment properties generally use the 6% ratio without that exemption.
These percentages are assessment ratios, not direct tax rates. A property remaining at 6% can carry a bill roughly 2.5 to 3.5 times the qualifying primary-residence bill, depending on local millage. Do not assume the seller's legal-residence status transfers automatically.
- Ask the county assessor about the legal-residence application and supporting documents.
- Have the lender explain which classification supports the initial escrow estimate.
- Keep enough liquidity for a higher bill while approval is pending.
Assemble insurance, assistance and closing costs early
Request address-specific homeowners, wind/hail and flood quotes. Where private wind coverage is unavailable, investigate SCWHUA eligibility. Separate policies can mean separate deductibles and escrow charges; a flood-zone designation alone does not establish the full insurance budget.
SC Housing offers the Homebuyer Program and Palmetto Home Advantage, with assistance structures that can include forgivable 0% loans, percentage-based assistance around 4%–5%, or fixed-dollar assistance under current program terms. Palmetto Heroes targets eligible service occupations, including teachers, first responders, veterans and nurses.
South Carolina closings require attorney supervision. Include attorney charges, prepaid insurance and escrow funding in your cash estimate. The deed recording fee is $1.85 per $500, equivalent to $3.70 per $1,000; sellers typically pay it, subject to the contract.
Compare Current Mortgage Rates
Compare current APRs, points, fees, and estimated monthly payments from participating lenders below.
Loan Program Comparison: 2026 Benchmarks
Charleston and Lowcountry Mortgage Hub: 4% Tax Ratio, Flood Zones and 2026 Loan Limits — Choose a mortgage by comparing eligibility, upfront cash and total monthly costs, not the advertised rate alone. Conventional, FHA, VA and USDA serve different borrowers. Confirm county limits, taxes, insurance and lender requirements before comparing personalized Loan Estimates for your household.
Historical 2025 one-unit comparison: conforming $832,750; FHA floor $541,287. County and unit-count limits can differ.
| Loan program | Down payment / equity | 2026 one-unit baseline | Costs and page-specific comparison |
|---|---|---|---|
| Conventional | 3%–5% subject to eligibility | $832,750 | PMI generally below 20% down |
| FHA | 3.5% at 580+; 10% at 500–579 | $541,287 floor | 1.75% upfront MIP; 0.55% annual for >95% LTV, base loan ≤$726,200, term >15 years |
| VA | 0% for eligible borrowers | No VA limit with full entitlement | No monthly PMI; funding fee unless exempt |
| USDA | 0% for eligible borrowers | Income, address and repayment eligibility | Guarantee and annual fees; confirm current schedule |
| Jumbo | Lender-specific cash and reserves | Above applicable conforming limit | Lender-specific pricing and insurance |
| Home Equity / Refinance | Equity and underwriting dependent | Property and lender dependent | Compare closing costs, term and break-even |
Sources: FHFA limits; HUD FHA limits.
Editorial Methodology & Primary Sources
Verification date: Not recorded; check the primary source and lender timestamp before relying on an estimate.
Rate comparisons use participating lender feeds, not a whole-market survey or guaranteed offers. Freddie Mac PMMS is a market benchmark, not a personalized quote. Calculator models rely on published regulatory formulas and disclosed assumptions rather than fabricated first-person loan testing.
Monthly principal and interest use the amortization formula P × r / (1 − (1 + r)−n), where r is the monthly note rate and n is the number of payments; at zero interest use P / n. PITI adds monthly property taxes and homeowners insurance; PMI is separate. APR includes applicable finance charges under Regulation Z and is not the note rate used for payments. Compare lender Loan Estimates for actual APR and fees.
- Consumer Financial Protection Bureau (CFPB) — Loan Estimates, APR and borrower disclosures; Regulation Z.
- U.S. Department of Housing and Urban Development (HUD / FHA) — FHA program guidance.
- U.S. Department of Veterans Affairs (VA) — VA loan eligibility and benefits.
- Freddie Mac Primary Mortgage Market Survey (PMMS) — published rate benchmarks.
- U.S. Census state tax collections — state property tax benchmarks; confirm parcel-specific assessments and exemptions with the state revenue department and local assessor.
- SC Housing — state housing finance and property tax authority.
- South Carolina Department of Revenue — state housing finance and property tax authority.
The payment snapshot uses illustrative annual taxes of 1% of home price, $1,200 insurance and 0.5% PMI below 20% down, not verified local quotes. Other calculators disclose their inputs and assumptions. Published guidance and lender feeds may change independently; confirm current program rules, taxes and offers before a decision.