How Much Can I Borrow with a HELOC?

The amount you can borrow with a HELOC depends on your home’s appraised value, your outstanding mortgage balance, your credit score, and the lender’s maximum CLTV (combined loan-to-value) limit.

The CLTV Formula

CLTV = (First Mortgage Balance + HELOC Amount) ÷ Home Value

Each HELOC lender sets its own maximum CLTV for primary residences, and the limit varies by lender and program.

Example Calculation

Home value: $800,000. First mortgage balance: $400,000. Lender CLTV limit: 85%.

• Maximum combined debt = $800,000 × 85% = $680,000
• Subtract first mortgage = $680,000 − $400,000 = $280,000 maximum HELOC

Factors That Affect Your Limit

• Credit score: Higher FICO scores typically unlock higher CLTV and larger lines
• Occupancy: Primary residences qualify for higher CLTV than second homes or investment properties
• Income: You must demonstrate the ability to repay — income documentation is required
• Lender caps: Some lenders have dollar caps on HELOC lines regardless of CLTV

How the same home produces different lines (illustrative example, not a quote)

Consider a home worth $1,000,000 with a $550,000 first mortgage. The ceiling depends on the combined limit a lender applies:

If the appraisal comes in at $900,000 instead, the 85% row falls to $765,000 of allowed debt, or $215,000 of line. A $100,000 swing in appraised value changed the available line by $85,000, so treat any pre-appraisal estimate as a range.

Count every lien

The formula subtracts all existing loans secured by the home, not just the first mortgage. An old second loan, or an existing HELOC you plan to keep can reduce what is available.

Borrowing capacity is not the same as borrowing sense

A line sized to the maximum is not necessarily the right line. Think about the payment if you draw it all, how that payment looks when the draw period ends and what happens to your equity cushion if California values dip.

Check the number against your budget

Before you accept a line size, calculate the interest-only payment on the full limit at a rate a couple of points above the starting rate, then ask whether your monthly budget can absorb it. If the answer is yes only in good conditions, choose a smaller line. You can usually take less than the maximum, and a smaller line also leaves more equity as a buffer if your home value dips.

Frequently asked questions

Can a lender reduce or freeze my line later?

Lenders may be able to reduce or suspend a line if your home value falls significantly or your financial situation changes materially. Read the freeze and reduction clauses before you sign.

Do I have to take the whole approved amount?

No. You can often take a smaller line, which also lowers the payment counted against you when you apply for other loans.

Does a higher credit score raise my line?

It can improve the combined limit available and the margin you are offered, as described above. The final answer depends on the program.

Related guides

• How a HELOC affects DTI
• Credit score tiers
• Property types that qualify
• Non-QM HELOC LTV limits
• Applying with Lendia