Complete Guide
18 min read
2,500+ words
Updated May 2026
What is a HELOC?
A complete, plain-English guide to how home equity lines of credit work — including rates, costs, qualification requirements, risks, and how to decide if one is right for you.
MJ
Michael Jensen
CFP® • CMPS® • 15 years in mortgage lending
May 2026
Published
May 2026
Last updated
★★★★★
Expert reviewed
Share:
What is a HELOC?
A HELOC (Home Equity Line of Credit) is a revolving credit line secured by the equity in your home. Think of it like a credit card — but instead of being backed only by your creditworthiness, it’s backed by your home as collateral. That collateral is why HELOC rates are significantly lower than credit cards or personal loans.
Like a credit card, a HELOC gives you a credit limit you can borrow against, repay, and borrow again — repeatedly — during an initial period called the draw period. You pay interest only on the amount you actually borrow, not the full credit limit.
Official definition
A HELOC is a secured revolving credit line that lets homeowners borrow against their home equity, repay it, and borrow again — up to a set credit limit — during an initial draw period. Interest is charged only on the amount actually drawn, not the total credit limit.
What makes a HELOC different from other loan types:
Revolving credit — borrow, repay, borrow again (unlike a lump-sum loan)
Secured by your home — lower rates than any unsecured debt because your home is collateral
Interest-only minimums — during the draw period, minimum payments cover only interest
Variable interest rate — tied to the prime rate, which moves when the Federal Reserve acts
Two distinct phases — draw period (borrow) followed by repayment period (pay back principal + interest)
How home equity becomes a HELOC
Your Home
$500,000
−
Mortgage
$300,000
=
Your Equity
$200,000
→
Your HELOC
Up to $125K
How does a HELOC work?
Getting and using a HELOC follows a clear process. Here’s exactly what happens from application to your first draw:
Apply with a lender — bank, credit union, or online lender. You submit income documents, credit authorization, and property information
Home appraisal — lender orders a full appraisal or AVM to determine your home’s current market value
Equity calculation — lender calculates your Combined Loan-to-Value (CLTV) ratio to determine how much you can borrow
Credit line approval — lender approves a credit limit (typically up to 85% CLTV) and sets your interest rate margin
Draw access granted — you receive access via checks, a debit card, or online transfers during the draw period
Borrow only what you need — draw funds in any amount up to your limit, whenever you need them
Pay interest on what you drew — minimum payments cover only interest on the drawn balance, not the full credit limit
Repay and reuse — as you repay the principal, your available credit is restored and you can borrow again
HELOC credit limit formula
(Home Value × 85%)−Outstanding Mortgage=Max HELOC
($500,000 × 85%)−$300,000=$125,000 max HELOC
The 85% CLTV rule Most lenders cap HELOCs at 85% Combined LTV — meaning your mortgage plus HELOC can’t exceed 85% of your home’s value. Some credit unions allow 90%. Texas law mandates a hard cap of 80% by state constitution.
Calculate your exact HELOC credit limitEnter your home value and mortgage balance to see how much you can borrow.
The most important structural feature of a HELOC — the one that catches most borrowers off guard — is that it has two completely different phases, each with very different rules and payment requirements.
HELOC two-phase structure (30-year total term)
DRAW PERIOD — 10 years
REPAYMENT PERIOD — 20 years
Draw period (years 1–10)
Credit line open & active. Borrow, repay, borrow again. Minimum = interest only. At 8.5%: $80K drawn = ~$567/mo.
Repayment period (years 11–30)
Credit line closes. Full P+I required. $80K at 8.5% over 20 yrs = ~$694/mo. A 22% payment jump — this is payment shock.
Payment shock warning If you draw $100,000 at 8.5% and pay interest only during the draw period, your payment at repayment start jumps from $708/month to $868/month — a 22.6% increase on the same balance. The larger your outstanding balance, the worse the shock.
How to avoid payment shock Make extra principal payments during the draw period — even $200/month extra significantly reduces your repayment balance. Use our HELOC Payoff Calculator to model the exact impact.
How HELOC rates work
Nearly all HELOCs carry a variable interest rate that moves whenever the Federal Reserve changes the federal funds rate. Understanding how your rate is built — and what you can control — is essential to getting the best deal.
Your HELOC rate = prime rate + your margin
Prime Rate: 7.50% — moves with the Fed
+1.00%
0%Prime (variable)Margin (fixed)8.50% total
7.50%
Prime rate
+
1.00%
Your margin
=
8.50%
Your HELOC rate
Prime rate — Set by the Fed; currently 7.50% in 2026. Moves with every Fed rate decision
Your margin — Set at closing and never changes. Ranges from 0.25% (excellent profile) to 2.50% (fair credit). This is the only part you can negotiate
Rate caps — Periodic cap (max change per period, usually 2%) and lifetime cap (usually 18%)
2026 rate context National average HELOC rate: 8.25%. Best available: 7.99% (PenFed Credit Union). Worst markets: 9.35% (Alaska). The difference on $150,000 is $1,890/year.
Calculate your true HELOC APRSee the real cost of any HELOC offer including all fees — not just the advertised rate.
HELOC costs fall into two categories: closing costs (paid once at opening) and ongoing costs (paid throughout the life of the HELOC). The range is wide — from $0 at some online lenders to $3,500+ at traditional banks.
Origination fee — $0–$1,500. Most negotiable cost. Many lenders waive it for creditworthy borrowers
Appraisal fee — $0–$700. Online lenders use free AVM. Banks require full appraisal
Title search fee — $0–$500. Verifies ownership and checks for liens
Annual maintenance fee — $0–$100/year. Keeps the line open (often waivable)
Early termination fee — $0–$500. Charged if you close within 2–3 years
Total cost comparison by lender type ($150K HELOC, 5-year term)
Traditional Bank
Closing costs$2,150
Annual fees ×5$400
Rate8.55%
Total 5-yr cost$66,275
Credit Union
Closing costs$450
Annual fees ×5$0
Rate8.15%
Total 5-yr cost$61,575
Online Lender
Closing costs$0
Annual fees ×5$0
Rate8.25%
Total 5-yr cost$61,875
Who qualifies for a HELOC?
Lenders evaluate four factors when approving a HELOC application. You need to pass all four — but credit unions are the most flexible lender type on each threshold.
4 HELOC qualification factors
Home equity minimum
15%+
Most lenders require at least 15–20% equity remaining after the HELOC. Max CLTV: 85% at most lenders (90% at some CUs).
Credit score minimum
620+
Minimum for approval. Best rates require 740+. Between 620–680, credit unions are significantly more flexible than banks.
Max DTI ratio
43%
Max debt-to-income ratio. Some credit unions allow 45–50%. Calculated including the new HELOC minimum payment in your debt total.
Income history
2 yrs
2 years of employment history required. Self-employed need 2 years of tax returns showing stable or increasing income.
Check your HELOC eligibility in 60 secondsScore all four factors and see which lender types you qualify for right now.
Already high DTI — adding HELOC payments to a strained budget
The decision rule “If the borrowed money either increases your home value or replaces higher-cost debt, a HELOC is usually the right tool. If it funds consumption — things that depreciate or disappear — it’s usually the wrong one.”
Key takeaways
Everything you need to remember
A HELOC is a revolving credit line secured by your home equity — borrow, repay, and borrow again up to your approved limit
Two phases: 10-year draw period (interest-only minimums) + 20-year repayment (full P+I) = 30-year total term
Variable rate = prime rate + your margin. Prime: 7.50% in 2026. National avg: 8.25%. Best available: 7.99% at PenFed
Qualify with: 15%+ equity (85% max CLTV), 620+ credit score, 43% max DTI, 2 years income history
Costs: $0 at online lenders to $3,500+ at banks. Credit unions offer the best rate + fee combination
Budget for payment shock from day one. Principal payments during the draw period significantly reduce the jump
Best for: staged renovation, emergency fund, debt consolidation. Avoid if: income is unstable or selling within 2 years
Always compare all 3 lender types — bank, credit union, online. Rate difference on $150K can be $600+ per year