How Much Home Equity Can You Borrow? The 80-85% Rule

TL;DR: Most lenders will let you borrow up to a combined 80% to 85% of your home's appraised value through a HELOC or home equity loan, and that limit includes your existing mortgage balance. On a $400,000 home with $200,000 still owed, that typically means access to roughly $120,000 to $140,000, depending on the lender's loan-to-value cap, your credit score, and your debt-to-income ratio.

_Last reviewed: August 2026 · 7 min read_

You've paid down your mortgage for years and the house is worth more than when you bought it, but nobody hands you a number that says "here's what you can actually borrow." Lenders use a formula, and once you know it, you can figure out your own limit in about five minutes.

Okoniq Property Hub tracks your mortgage balance and home value estimates in one place, so you're not digging through old statements when you need your equity numbers fast.

How much home equity can you actually borrow against?

Most lenders cap total borrowing at 80% to 85% of your home's appraised value, and that ceiling includes your first mortgage, not just the new loan. This number is called your combined loan-to-value ratio, or CLTV.

Here's the math on a $400,000 home with $200,000 left on the mortgage. At an 80% CLTV cap, the lender allows total debt of $320,000 against the property. Subtract the $200,000 you already owe, and $120,000 is available to borrow. Some credit unions and portfolio lenders go up to 90%, especially for borrowers with strong credit and stable income, which would push that same example closer to $160,000.

The exact cap varies by lender, loan type, and sometimes by state. A home equity loan or HELOC both use this same CLTV math, but they structure the payout differently, which matters more once you know your ceiling.

What's the difference between a HELOC and a home equity loan for borrowing power?

Both use the same 80-85% CLTV cap, but they give you access to the money in different ways. A home equity loan hands you the full approved amount as a lump sum on day one, with a fixed rate and fixed monthly payment for the life of the loan, often 10 to 20 years.

A HELOC works more like a credit card tied to your house. You get approved for a credit line, say $100,000, but you only draw what you need and pay interest on the balance you've actually used. Draw periods typically run 10 years, followed by a repayment period of 10 to 20 years where you can no longer pull new money.

If you're comparing this option against pulling cash out through your first mortgage instead, HELOC vs cash-out refinance breaks down when each makes more sense based on your current rate.

| Feature | HELOC | Home Equity Loan | |---|---|---| | Payout | Draw as needed | Lump sum upfront | | Rate | Usually variable | Usually fixed | | Best for | Ongoing or uncertain costs | One-time known expense | | Typical term | 10-yr draw + 10-20 yr repay | 10-20 years fixed |

How does your credit score and debt-to-income ratio affect how much you can borrow?

Your CLTV cap is the ceiling, but your credit score and debt-to-income ratio decide whether you get anywhere near it. A borrower with a 760 credit score and a debt-to-income ratio under 36% will often get offered the full 85% CLTV. A borrower with a 650 score and a DTI closer to 45% might only qualify for 70% to 75%, even on the identical property.

Lenders calculate DTI by adding up all monthly debt payments, including the new home equity payment, and dividing by gross monthly income. Most want that number at 43% or lower, though some go up to 50% for borrowers with excellent credit or significant cash reserves. If your income and expenses are documented cleanly, approval moves faster and the offered rate tends to be lower too.

Checking your current mortgage balance accurately matters here, since even a small error in what you think you owe can throw off your equity math. Reading your mortgage statement correctly is the first step before applying anywhere.

What happens if you borrow the maximum and home values drop?

Borrowing right up to the 80-85% cap leaves almost no cushion if your home's value falls. If that $400,000 home drops to $360,000 and you'd borrowed the full $120,000 on top of your $200,000 mortgage, your combined debt of $320,000 now sits at nearly 89% of the new value, above what most lenders consider safe.

This doesn't trigger an automatic problem with a fixed home equity loan since your payment stays the same either way. But it can matter a lot if you try to sell, refinance, or need to draw more from a HELOC, since a lender pulling a new appraisal will see less equity to work with than you expected. Values have swung 10% to 15% in either direction in various US markets between 2022 and 2024, so this isn't a hypothetical.

A safer approach for many owner-operators is borrowing 60% to 70% of the available cap rather than the full amount, keeping a buffer for market shifts. Pairing that discipline with a separate emergency fund means a value dip doesn't force a bad decision under pressure.

How do you calculate your own borrowing limit right now?

You can estimate your number with three inputs: your home's current value, your mortgage payoff balance, and the lender's CLTV cap. Multiply your home value by 0.80 (or 0.85 if you have strong credit), then subtract what you currently owe on the mortgage.

For a home worth $350,000 with $150,000 owed: $350,000 × 0.80 = $280,000, minus $150,000 owed = $130,000 available. Run the same math at 0.85 to see the higher end some lenders might offer: $297,500 minus $150,000 = $147,500. Get a real estimate of your home's value from a recent comparable sale or an appraisal rather than an automated online estimate, since those can be off by 5% to 10% in either direction.

FAQ

Can I borrow 100% of my home equity?

No. Almost no lender allows borrowing up to 100% of your home's value; the vast majority cap combined loan-to-value at 80% to 90%, leaving at least 10% to 20% of the home's value untouched as a buffer.

Does borrowing against home equity affect my ability to refinance later?

Yes. A second lien from a home equity loan or HELOC can complicate a future refinance, since the new lender needs to account for or pay off that second loan, and your combined LTV must still meet their limits.

How fast can I get approved for a home equity loan or HELOC?

Approval typically takes 2 to 6 weeks, including appraisal, income verification, and underwriting, though some digital lenders offer HELOCs in as little as 5 to 10 business days for straightforward applications.

Is interest on a home equity loan tax deductible?

It can be, but only if the funds are used to buy, build, or substantially improve the home securing the loan, under current IRS rules effective through 2025.

What credit score do I need to borrow against home equity?

Most lenders want a minimum score of 620, but the best rates and highest CLTV offers usually go to borrowers with scores of 740 or above.

This is educational information, not tax or financial advice. Talk to a CPA about deductibility and consult your lender directly for current loan-to-value limits in your state.