Charleston South Carolina Mortgage Calculator 2026

Charleston offers housing costs that fall below the national average. At a median home price of $320K -- about 24% below the U.S. median -- the city presents realistic home-ownership opportunities for a wider range of income levels.

The income-to-home-price ratio of 5.3x means buying is possible but requires disciplined budgeting. A household at the median income of $60K can qualify for the median-priced home, though the monthly payment may consume a larger share of take-home pay than is ideal.

The market in Charleston has been relatively stable, giving buyers more time to evaluate options and negotiate terms without the urgency of a rapidly shifting price environment.

Monthly housing costs extend well beyond principal and interest. For a median-priced home of $320K with 20% down at approximately 6.8%, the principal-and-interest payment comes to around $1,669 per month. Add property taxes of roughly $147/mo (0.55% rate) and homeowners insurance near $133/mo, and the total PITI lands around $1,949 per month.

Using the 28% rule of thumb, a household would need a gross annual income of approximately $83,529 to comfortably carry that payment. These are estimates -- actual numbers depend on credit score, loan type, and lender terms.

South Carolina's progressive income tax tops out at 6.2%, and property taxes average 0.5%. Higher earners should factor the marginal rate into their housing budget, as it directly affects how much mortgage payment they can comfortably carry.

For a home priced at $320K, annual property taxes of approximately $1,760 are a significant recurring cost that lenders include in qualifying calculations. Understanding the full tax picture helps set realistic expectations for both monthly cash flow and long-term affordability.

1. South Carolina Housing Finance Authority (HFA) — offers below-market mortgage rates and down payment assistance for income-qualified buyers.

2. HUD-approved housing counseling agencies in Charleston offer free or low-cost guidance on mortgage readiness and local assistance programs.

3. FHA loans are widely used in Charleston — they require as little as 3.5% down ($11K on the median home) and are available to borrowers with credit scores as low as 580.

4. USDA and VA loans may apply to eligible buyers — USDA covers rural/suburban areas, VA loans require no down payment for qualifying veterans.

With a one-bedroom rental averaging around $1,500/mo and total ownership costs near $1,949/mo for the median home, buying carries a premium of roughly $449/mo in year one over renting. However, that gap narrows as equity builds and rent prices rise.

A common rule of thumb: if you plan to stay at least 3-5 years, buying in Charleston is likely the stronger financial move. Shorter timelines typically favor renting given transaction costs (closing costs, agent commissions) that take time to recoup.

The local price-to-rent ratio — home price divided by annual rent — is approximately 18x. In the 15-20x range, both options are viable depending on your timeline.

1. Compare lender-reviewed estimates, not just rough pre-qualification ranges. In a competitive market, sellers often prefer buyers with stronger underwriting support.

2. Target homes priced 10-15% below the median ($278K) to give your budget more breathing room after move-in costs.

3. Compare offers from at least three lenders. A 0.25% difference in rate on $320K saves roughly $19,200 over 30 years.

4. Schedule a home inspection even in competitive markets — skipping it to win a bid can cost far more than the inspection fee if hidden issues emerge after closing.

5. Check your credit report 6 months before applying — disputing errors takes time, and each point above 740 can improve your rate meaningfully.