How Does a HELOC Work? A Step-by-Step Guide

Key Takeaways

• Your equity sets the ceiling. A lender's combined loan-to-value limit, minus what you owe, determines the most you could borrow. Credit and income decide what you are approved for.
• You pay interest only on what you draw. An open line with no balance accrues no interest.
• Payments move for two reasons. The variable rate can change, and your balance changes every time you draw or repay.
• Repayment is a second phase with a higher payment. When the draw period ends, borrowing stops and principal is due.
• Wescom Financial adds a fixed-rate option. Eligible balances can be converted to a fixed rate after any introductory period ends.

A home equity line of credit (HELOC) lets you borrow against the value you have built in your home. It works like a revolving credit line secured by your home: you are approved for a limit, draw what you need, repay it, and borrow again. This guide walks through each step, from setting the limit to paying off the line.

The Short Answer

A HELOC works in six steps.

1. Your equity sets the credit limit.
2. The line is established and secured by your home.
3. You draw funds, and available credit falls.
4. You pay interest on the drawn balance, at a variable rate.
5. The draw period ends and repayment begins.
6. You pay off the balance and decide whether to close the line.

How a HELOC Works, Step by Step

Step 1: Your Equity Sets the Credit Limit

Home equity is your home's value minus what you owe on it. Combined loan-to-value (CLTV) compares everything secured by the home, including the new line, to its value.

Many lenders, including Wescom, set a maximum CLTV of 80%. The math takes three steps:

1. Multiply the home's value by 80%.
2. Subtract your mortgage balance and any other liens.
3. The result is your maximum possible line.

For example, a $900,000 home × 80% = $720,000. Subtract a $500,000 mortgage, and the ceiling is $220,000.

That figure is a ceiling, not an approval. Your credit profile, income, and a verified property value determine the actual limit and your margin, the part of your rate the lender adds to the index.

Step 2: The Line Is Established, Secured by Your Home

Underwriting sets your credit limit and margin. Once approved, the line opens as a lien on your property.

That collateral is why a HELOC can carry a lower rate than unsecured credit, and it is what's at stake if payments are missed. The Consumer Financial Protection Bureau (CFPB) warns that if you cannot repay on schedule, you could lose your home. Property insurance is required.

At Wescom, borrowers need to meet membership eligibility before funding. Eligible Californians can apply through online banking from anywhere in the state, by phone, or at a branch.

Step 3: You Draw Funds, and Available Credit Falls

Each draw lowers your available credit. Each principal payment restores it.

Interest applies only to what is outstanding. Wescom's draw period is currently 10 years.

Step 4: How Interest and Payments Are Calculated

During the draw period, Wescom's minimum payments are interest-only. That keeps payments low, but only extra payments toward principal reduce the balance.

The rate is variable. Wescom's HELOC rate is the Prime Rate plus your margin, and it can adjust monthly. The Federal Reserve publishes the bank prime loan rate in its H.15 release, so you can track the index yourself.

Variable-rate HELOCs must have a lifetime rate cap. Wescom's current disclosure sets a maximum APR of 17.90% and a minimum of 3.00%^*.

Step 5: The Draw Period Ends and Repayment Begins

When the draw period ends, borrowing stops. Your payment switches to principal plus interest, amortized over the repayment period. Wescom's repayment period is currently 20 years.

The payment usually rises, and the line no longer serves as a source of cash. The CFPB notes that monthly payments are often significantly higher once repayment begins.

To soften that step-up, pay down principal during the draw period. A smaller balance means a smaller amortizing payment.

Step 6: Paying Off and Closing the Line

You can pay the balance to zero at any time. Closing the line is a separate decision; a paid-off line can stay open as a reserve for the rest of the draw period.

Some lenders charge a fee for early closure. Wescom's terms appear in the costs section below.

A Worked Example: One Line of Credit, Start to Finish

This example follows one $150,000 line from the first draw to repayment.

Hypothetical example. Assumes a $150,000 line, a constant rate within each period, and interest-only payments during the draw period. Actual payments depend on daily balances, rate changes, and your agreement.

Two takeaways: repaying $20,000 in Year 2 restored credit the homeowner reused in Year 5, and the same $50,000 balance costs about $385 a month interest-only versus about $458 once principal is due.

HELOC, Home Equity Loan, or Cash-Out Refinance?

A home equity loan and a cash-out refinance tap the same equity through different structures.

Compare these on total cost over the time you will carry the balance, not on the first monthly payment. Our HELOC vs. home equity loan guide and cash-out refinance comparison cover each decision in detail.

What Can You Use a HELOC For?

A HELOC fits best when costs arrive over time or the total is not known in advance.

• Home improvements. Contractor payments come in stages, and you draw as each bill arrives.
• Tuition. Semester-by-semester costs match the draw-as-needed structure.
• An emergency reserve. An open line with no balance accrues no interest, but it is there if a roof or a medical bill hits.
• Debt consolidation. A HELOC can lower the rate on high-interest balances. It also moves unsecured debt onto your home. See our guide to a HELOC for debt consolidation before deciding.
• Buying before selling. Some lenders offer a line designed to fund a down payment on your next home before your current one sells.
• Non-primary property. Wescom currently makes HELOCs on second homes and investment properties in California, subject to different pricing and terms.

A HELOC is a weaker fit for a single known expense, where a lump sum may be simpler, and a poor match for short-lived purchases, like vacations or cars, which lose their value long before the balance is repaid.

How a Wescom HELOC Compares

Fixed Rate Conversion¹

• Converted balances receive a 0.50% APR discount.
• Terms run from 5 to 20 years in five-year increments. Balances of $15,000 to $49,999 can be converted for up to 15 years.
• You can hold up to three converted balances at once.
• The minimum APR on a converted balance is 6.00%, and a $75 fee applies to each conversion.
• Balances within an introductory rate period are not eligible until that period ends.

What a Wescom HELOC Costs²

Wescom's HELOC carries a $75 annual fee, waived the first year and for Platinum Signature Members. Wescom covers most closing costs. Members pay for any full appraisal they request, and a $750 to $2,500 processing fee applies if the line is paid off and closed within 36 months (not applicable to HELOC Flex).

Buying Before You Sell: HELOC Flex³

What to Weigh Before You Open a Line

Before you open a line, weigh these:

Your Next Step

Start with two numbers: your available equity, using the Step 1 math, and your payment in both stages, interest-only during the draw period and principal plus interest after it.

Estimate your HELOC payment with Wescom's calculators. If you would like to talk it through, schedule an appointment with a mortgage loan officer.

Frequently Asked Questions

How Does a HELOC Work in Simple Terms?

A HELOC is a revolving credit line secured by your home. You draw what you need up to your limit, pay interest only on what you borrow, and repay principal and interest after the draw period ends.

How Much Can I Borrow With a HELOC?

It depends on your equity, the lender's CLTV limit, and your qualifications. At 80% CLTV, multiply your home's value by 80% and subtract what you owe.

How Long Is the Draw Period, and What Happens When It Ends?

Wescom's draw period is currently 10 years. When it ends, you can no longer borrow, and payments cover principal plus interest over the repayment period, currently 20 years.

Do I Pay Interest on the Whole Credit Line?

No, only on what you have drawn, though an annual fee may still apply.

What Is the Difference Between a HELOC and a Home Equity Loan?

A HELOC is a revolving line, usually at a variable rate. A home equity loan pays a lump sum upfront, usually at a fixed rate, with interest on the full amount from day one.

Can I Lock My Wescom HELOC Into a Fixed Rate?¹

Yes. Wescom's Fixed Rate Conversion lets you lock balances of $15,000 or more into a fixed rate with a 0.50% APR discount, after any introductory period ends.

Are There Closing Costs on a Wescom HELOC?²

Wescom covers most standard closing costs. Member-requested appraisals and early-closure processing fees are exceptions.

Is HELOC Interest Tax-Deductible?

It depends on how you use the money. Per IRS Publication 936, interest generally is not deductible unless the funds buy, build, or substantially improve the home securing the loan. Talk with a tax professional.

Disclosures