How a home equity line of credit works

What a HELOC is

A HELOC lets you borrow against your equity: the value of your home minus what you still owe on it. The CFPB describes it as a loan that lets you borrow, spend, and repay as you go, using your home as collateral.

If you already have a mortgage, a HELOC sits behind it as a second lien. Your first mortgage stays exactly as it is. Its rate, its balance, and its payment do not change. The HELOC is a separate account with its own payment.

You draw funds by transfer, special checks, or a card, depending on the lender. Some plans ask you to take an initial amount when the line opens, borrow a minimum each time, or keep a minimum balance. Ask about these before you choose a plan, because they affect how flexible the line really is.

The draw period and the repayment period

Every HELOC has two phases. During the draw period you can borrow up to your limit. When it ends, borrowing stops and you enter the repayment period, where you pay down whatever balance is left.

During the draw period

The CFPB notes that the draw period is usually about ten years, though your agreement sets the exact length. Payments during this phase depend on the plan. Some require a minimum payment that covers interest plus a small share of principal. Others allow interest-only payments, which means the balance does not shrink unless you pay extra.

Because the rate on most lines is variable, your payment can change from month to month even if you never draw another dollar.

When the repayment period starts

Once the draw period ends, the lender may set a schedule to repay the full balance, often over ten or 15 years according to the CFPB. Your payment now includes principal on the whole remaining balance, so it is often noticeably higher than what you were paying during the draw period.

Some plans work differently: the entire balance comes due at once at the end of the draw period. That is called a balloon payment. If your plan has one, you need a way to cover it, usually by refinancing, and if you cannot pay it you could lose your home.

• Ask how long the draw period lasts and how long the repayment period lasts.
• Ask whether draw-period payments are interest-only or include principal.
• Ask whether the plan ends with a balloon payment.
• Ask what the payment would look like on your expected balance once repayment starts.

How HELOC rates work: index, margin, and fixed-rate options

Most HELOCs carry a variable rate made of two parts. The index is a published benchmark that moves with the wider economy. The margin is an amount the lender adds on top of the index. Your rate is the index plus the margin, and it changes when the index changes.

Lenders use different indexes. The CFPB lists the U.S. prime rate and the Constant Maturity Treasury (CMT) rate as common ones. The margin is set when you open the line, and it is one of the main things to compare between offers, along with how often the rate can adjust and whether there is a cap or a floor.

Some lenders advertise a lower introductory rate for the first few months. Find out exactly when it ends and what the rate becomes after that.

Fixed-rate options

Some lenders offer fixed-rate options on all or part of the balance, where offered. Usually this works by locking a portion of what you have drawn at a set rate for a set term stated in your agreement, which gives that portion a predictable payment. The CFPB notes that the fixed rate is typically higher than the variable rate.

If a fixed-rate option matters to you, ask four things: how much of the balance can be locked, how long the fixed rate lasts, whether there is a fee to convert, and what happens to the rest of the line while a portion is locked.

How much you can borrow with a HELOC

Lenders size the line using combined loan-to-value, or CLTV. That is everything secured by the home (your current mortgage plus the new line) divided by the home's value. Each lender sets a maximum CLTV, and limits vary by lender, by property type, and by your credit profile.

The math works like this. Take the home's value, multiply by the lender's maximum CLTV, then subtract what you owe on the mortgage. What is left is the most the line could be.

Notice that you cannot borrow all of your equity. Lenders keep a cushion so the home is still worth more than everything owed on it. The CFPB says lenders typically require you to keep at least 10% to 20% of your home's value as equity.

Two other things can shrink the number. First, the value the lender uses may come in lower than you expect. Second, your income and existing debts still have to support the payment, so the line you qualify for can be smaller than the CLTV math alone suggests.

HELOC requirements: what lenders look at

Lenders look at four main things: your equity, your credit, your debt-to-income ratio, and how you use the property. Exact cutoffs are set by each lender and program.

• Equity. You need enough value in the home, after your current mortgage, to fit under the lender's CLTV limit.
• Credit. Your credit history and score affect whether you qualify and the margin you are offered. Recent late payments, collections, or a thin file can limit options.
• Debt-to-income (DTI). This compares your monthly debt payments, including the new line, to your gross monthly income. Lenders want to see that you can carry the payment.
• Occupancy. Whether the home is your primary residence, a second home, or a rental changes which programs are available and how much you can borrow.

Primary homes, second homes, and rentals

Most HELOC programs are built for primary residences. Some lenders also offer lines on second homes and investment properties, and those may come with lower limits and a closer review of the property and your finances. If you plan to rent out your primary home later, read the agreement first. The CFPB warns that renting your home out may be prohibited under some line-of-credit terms.

Costs to ask about

HELOC costs vary from lender to lender. Some lenders waive some up-front costs and others charge them. Ask for every cost in writing so you can compare offers side by side. The CFPB lists these as charges a lender may include:

• An application fee, which may not be refunded if you are turned down.
• Appraisal or valuation charges.
• Origination, title, and other closing costs when the account opens.
• An annual or membership fee for keeping the line open.
• An inactivity fee if you do not use the line.
• A cancellation or early termination fee if you close the line in its first few years.
• A conversion fee for moving part of the balance to a fixed rate.

How the HELOC process works and how long it takes

The process is shorter than a purchase mortgage because there is no sale and your first mortgage is not being replaced. Most HELOCs follow the same basic steps.

1. 1Review your options. You share your goal, a rough home value, and your mortgage balance, and the lender estimates a line size.
2. 2Apply. You provide income, debt, and property information and authorize a credit check.
3. 3Value the home. Depending on the program, this may be a full appraisal, an exterior-only inspection, or an automated valuation.
4. 4Underwriting. The lender verifies income, title, and the value, then issues an approval with terms.
5. 5Review disclosures and sign. You get the rate terms, fees, and payment rules in writing before the line opens.
6. 6Right to cancel. On a primary home, federal law gives you three business days after opening to cancel in writing.
7. 7Access funds. Once that window passes, you can draw on the line.

How fast a HELOC can fund

Timelines depend mostly on the valuation method and how quickly documents come in. Traditional HELOCs that need a full appraisal and manual review take longer. Some newer digital programs use an automated valuation model in place of a full appraisal and verify income and title electronically. For qualifying borrowers, some of these programs, including ones Chris offers, can fund in as little as five days. Not every property or borrower fits these programs, and the right-to-cancel period on a primary home still applies before funds are released.

HELOC vs cash-out refinance vs home equity loan

All three let you borrow against your equity, and all three are secured by your home. The difference is how the money arrives and what happens to your first mortgage.

The cash-out refinance question usually comes down to your current mortgage rate. If your existing first mortgage has a rate you want to keep, a HELOC or home equity loan leaves it alone. A cash-out refinance resets the rate on your whole mortgage balance, and the CFPB notes its closing costs are generally higher. Depending on the terms, the CFPB says a cash-out refinance can be more or less expensive than a HELOC.

HELOC risks to weigh

The biggest risk is simple: your home secures the line. If you fall behind or cannot repay on schedule, you could lose your home. Borrow an amount you are confident you can pay back, including after the repayment period begins.

• The rate can rise. On a variable line, your payment goes up when the index goes up, even if your balance stays the same.
• The payment changes when repayment starts. Moving from interest-only or low payments to full principal and interest can be a large jump.
• The lender can freeze or reduce your line. HELOC agreements generally allow this if your home's value drops or your financial situation gets worse. Do not count on unused credit for a future emergency.
• Selling means paying it off. You are generally required to pay off the HELOC in full when you sell the home.
• Easy access can grow the balance. A line that is always available can creep up over time. Decide up front what you will use it for.

If you are using a HELOC to consolidate higher-cost balances, it replaces several due dates with one, secured by your home. The old balances are paid, and the debt now sits on your house. That only helps if the spending that created those balances does not start again.

Is HELOC interest tax deductible?

It depends on how you use the money. Under IRS Publication 936 (2025 edition), interest on a home equity loan or line of credit is deductible only if the funds are used to buy, build, or substantially improve the home that secures the loan, and other limits apply. Interest on money used for other purposes, such as paying off credit cards, does not qualify under those rules.

Tax law in this area has changed in recent years, so check the current version of Publication 936 and any newer IRS guidance, and talk with a tax adviser about your own situation. Keep records of how you spend each draw if you plan to claim the deduction.

What to have ready

Having these on hand speeds up the review and keeps the timeline short.

• Your most recent mortgage statement for every loan on the property.
• Recent pay stubs and W-2s, or tax returns if you are self-employed.
• Your homeowners insurance declarations page.
• Your property tax bill, and HOA statement if you have one.
• For a rental, the current leases.
• A rough idea of how much you need and when, so the line fits the plan.