How much equity you can borrow against your house usually comes down to a single number: the combined loan-to-value ratio your lender will accept. Most lenders cap total debt on the property at 80% to 85% of its appraised value, and a few will stretch to 90% for strong borrowers. Whatever sits between your current mortgage balance and that ceiling is what you can actually pull out.
Calculating Your Borrowable Equity
Start with what the home is worth today. You can estimate market value through recent comparable sales, online valuation tools, or a professional appraisal. Then subtract every debt secured by the property: the primary mortgage, any existing home equity loan or line, and any recorded liens. The remainder is your equity.
If your home is worth $450,000 and you owe $250,000 on the mortgage, you have $200,000 in equity. That is not the same as $200,000 you can borrow. Lenders keep a cushion in case the property loses value, and the size of that cushion is set by the combined loan-to-value (CLTV) ratio.
The CLTV Ceiling That Sets Your Cap
Two ratios control how much a lender will let you borrow. Loan-to-value (LTV) divides your primary mortgage balance by the home’s appraised value. Combined loan-to-value (CLTV) adds every loan on the property, including the proposed new one, and divides by that same value. When you apply for a second lien, CLTV is the number that matters.
Fannie Mae’s eligibility matrix, which drives most conventional lending, allows subordinate financing on a primary residence up to 90% CLTV.1Fannie Mae. Eligibility Matrix In practice, many lenders set their own ceiling at 80% or 85%. A few will go to 90% for borrowers with excellent credit, but expect a higher interest rate or additional pricing adjustments above 85%.2Fannie Mae. Combined Loan-to-Value (CLTV) Ratios
Here is how the math works on a $500,000 home with a $300,000 mortgage:
- At 80% CLTV, total allowable debt is $400,000. Subtract the $300,000 mortgage, and you can borrow up to $100,000.
- At 85% CLTV, total allowable debt is $425,000, leaving $125,000 available.
- At 90% CLTV, total allowable debt is $450,000, leaving $150,000 available.
The gap between an 80% and 90% cap on the same property is $50,000. That is real money, and it is why comparing lenders matters. One bank’s 80% ceiling is not universal.
How Credit and Debt Move Your Cap
Having enough equity does not guarantee you get the full amount. Lenders run your finances through a second filter: credit score and debt-to-income (DTI) ratio.
Your DTI compares total monthly debt payments, including the proposed new payment, against gross monthly income. Fannie Mae allows a maximum DTI of 50% for loans run through its automated underwriting system. For manually underwritten loans, the baseline is 36%, though borrowers with higher credit scores and cash reserves can qualify up to 45%.3Fannie Mae. Debt-to-Income Ratios Many lenders use 43% as their internal cutoff regardless of what Fannie Mae permits.
Credit scores work alongside DTI. Most lenders require a minimum score in the 660 to 680 range for a home equity loan. Below that threshold, expect a reduced CLTV cap. A lender might limit you to 70% or 75% instead of 85%, even when the equity is there. A higher score can push the cap the other way and unlock 90% CLTV. Credit score is the dial that moves your CLTV limit within the lender’s range.
Investment Properties Have Tighter Limits
Everything above assumes a primary residence. Borrow against a rental or investment property and the caps drop. Fannie Mae’s eligibility matrix limits cash-out refinancing on a single-unit investment property to 75% LTV, and on multi-unit investment properties to 70%.1Fannie Mae. Eligibility Matrix Subordinate financing through a separate home equity loan or HELOC is only permitted on primary residences under Fannie Mae guidelines, so for investment properties a cash-out refinance is typically the only way to pull equity out.
An investment property worth $500,000 with a $300,000 mortgage might yield only $75,000 in accessible equity at 75% LTV, compared to $150,000 on a primary home at 90%. Lenders price the higher default risk into both the rate and the cap.
Closing Costs Reduce What You Actually Receive
Home equity loans carry closing costs, and ignoring them can make a smaller loan impractical. Typical closing costs run 2% to 5% of the loan amount. Common line items include:
- Appraisal fee, usually $525 to $1,300 depending on property type and location. Some lenders use automated valuation models on standard single-family homes, which can reduce or eliminate this charge.
- Origination fee, often 0.5% to 1% of the loan.
- Title search and, in some cases, a new title insurance policy to confirm no unexpected liens exist on the property.
- Recording fees charged by the county for recording the new lien, which vary by jurisdiction.
On a $50,000 home equity loan, closing costs of $1,000 to $2,500 are common. Lenders that advertise “no closing costs” typically roll those charges into a higher rate or require you to keep the account open for a minimum period. HELOCs may also carry annual fees and early termination fees that fixed-rate home equity loans do not.
Borrowing Near the Cap Is Where Risk Concentrates
The collateral for a home equity loan is your home. If you cannot make the payments, the lender can foreclose.4Federal Trade Commission. Home Equity Loans and Home Equity Lines of Credit A second-lien lender sits behind the primary mortgage in priority, but it still holds the right to start foreclosure on a defaulted loan.
A declining market compounds the problem. If your home’s value falls below what you owe across all mortgages, you are underwater. Selling will not cover the debt, and refinancing is nearly impossible because no lender will issue a new loan for more than the home is worth. Higher CLTV borrowing amplifies exactly this scenario. The less equity cushion you keep, the less room you have to absorb a market dip.
HELOC borrowers face one more risk. The lender can freeze or reduce your credit line if the property’s value drops significantly.4Federal Trade Commission. Home Equity Loans and Home Equity Lines of Credit If you were counting on that line to finish a renovation, a frozen HELOC can leave the project stalled with no funding to complete it. Deciding how much to borrow is not just a question of what the lender will approve. It is a question of how much cushion you want to keep between yourself and the next downturn.