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South Carolina HELOC Calculator

Estimate South Carolina home equity line payments and available credit

Calculate how much you can borrow against South Carolina home equity and the interest-only and repayment-phase monthly payments on a HELOC. Uses your home value, mortgage balance, and a typical 85% combined loan-to-value limit.

How much can I borrow with a HELOC in South Carolina?

South Carolina lenders typically allow up to 85% combined loan-to-value. On a $500,000 home with a $300,000 mortgage, that leaves $125,000 of available credit ($500,000 times 0.85 minus $300,000).

A South Carolina HELOC calculator estimates how large a home equity line of credit you can open in South Carolina and what the monthly payments look like in both the draw phase and the repayment phase. A HELOC lets you borrow against the equity you have built — the gap between your home’s value and what you still owe.

How it works

The calculator works in three steps.

First, available credit. Lenders limit your total borrowing to a share of the home’s value, called the combined loan-to-value (CLTV):

availableCredit = max(0, homeValue * 0.85 - mortgageBalance)

Most South Carolina lenders allow a combined loan-to-value (CLTV) up to 85%, so the calculator uses 85% by default.

Second, the draw-phase payment. While the line is open you typically pay interest only on what you have drawn:

interestOnly = drawnBalance * APR / 12

At a representative South Carolina rate of 8.40% APR, every $100,000 drawn costs about $700 per month in interest.

Third, the repayment-phase payment. When the draw period ends, the outstanding balance is amortised with the standard formula:

M = P * r * (1 + r)^n / ((1 + r)^n - 1)

where P is the balance, r is the monthly rate (APR / 12) and n is the number of repayment months. When the rate is 0, the payment is simply P / n.

Example

Take a $500,000 South Carolina home with a $300,000 mortgage balance. At 85% CLTV the line caps at $425,000, leaving $125,000 of available credit. If you draw the full amount at 8.40%, the interest-only draw payment is about $875 per month. Once a 15-year repayment phase begins, the payment amortises to roughly $1,224 per month — a large step up, which is why planning for the repayment phase matters.

Notes

This is an estimate for planning only, not financial advice. HELOC rates in South Carolina are variable and tied to the prime rate, so your payment will change as rates move. The 85% CLTV limit is a common lender default, but individual lenders set their own caps, fees, draw periods and minimum draws based on your credit and the property. Verify every figure with a licensed South Carolina lender before borrowing. Information here is not affiliated with the Consumer Financial Protection Bureau or any South Carolina regulator.