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How Much Home Equity Can I Borrow?
You can typically borrow up to 80–90% of your home’s appraised value minus your outstanding mortgage balance. For a home worth $400,000 with a $250,000 mortgage, that means you could borrow $70,000 (at 80% LTV) to $110,000 (at 90% LTV). The exact amount depends on your lender’s LTV cap, your credit score, income, and debt-to-income ratio.
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Key Takeaways
- Most lenders cap combined loan-to-value (CLTV) at 80–90% of your home’s appraised value
- Formula: (Home value × LTV cap) − mortgage balance = maximum borrowing amount
- Credit unions and online lenders sometimes offer higher LTV caps (up to 90–95%) than traditional banks
- Your actual approved amount may be lower than the maximum if your DTI, credit, or income don’t fully qualify
- A home appraisal determines the official value — it may differ from your Zillow estimate
- Borrowing the maximum leaves little equity cushion — if home values drop, you could owe more than your home is worth
The Home Equity Borrowing Formula
The maximum amount you can borrow from your home equity is calculated using your combined loan-to-value ratio (CLTV). Here’s the formula:
Maximum borrowing amount = (Home’s appraised value × LTV cap) − Current mortgage balance
For example: Your home appraises at $350,000. Your lender has an 85% LTV cap. You owe $200,000 on your mortgage. Maximum borrowing: ($350,000 × 0.85) − $200,000 = $297,500 − $200,000 = $97,500.
Borrowing Limits by LTV Cap
Different lenders offer different LTV caps. Here’s how the maximum borrowing amount changes based on a $400,000 home with a $250,000 mortgage:
| LTV Cap | Max Total Loans | Available to Borrow | Equity Remaining |
|---|---|---|---|
| 80% | $320,000 | $70,000 | $80,000 (20%) |
| 85% | $340,000 | $90,000 | $60,000 (15%) |
| 90% | $360,000 | $110,000 | $40,000 (10%) |
| 95% | $380,000 | $130,000 | $20,000 (5%) |
Caution: Borrowing at 90–95% LTV leaves very little equity cushion. If your home’s value drops even 5–10%, you could be “underwater” — owing more than your home is worth. This limits your ability to sell or refinance.
Factors That Affect How Much You Can Borrow
Even if the LTV formula shows a high maximum, several factors can reduce your actual approved amount:
- Credit score: Lower scores may result in a lower LTV cap or reduced loan amount
- Debt-to-income ratio: If adding the home equity loan payment pushes your DTI above 43%, the lender may approve a smaller loan
- Income stability: Inconsistent or declining income may limit your borrowing power
- Appraisal value: If your home appraises lower than expected, your available equity shrinks
- Property type: Investment properties and condos may have lower LTV caps (70–80%)
- Lender minimums and maximums: Some lenders have minimum loan amounts ($10,000–$25,000) or maximum limits ($250,000–$500,000)
How Much Should You Actually Borrow?
Just because you can borrow a certain amount doesn’t mean you should. Financial advisors generally recommend borrowing only what you need and leaving a comfortable equity cushion — ideally maintaining at least 20% equity after the loan.
Consider these guidelines: borrow only the amount needed for your specific purpose, ensure the monthly payment fits comfortably in your budget (not just barely qualifies on DTI), maintain enough equity to absorb a potential 10–15% home value decline, and factor in closing costs (2–5%) when calculating the total cost.
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Frequently Asked Questions
Can I borrow 100% of my home equity?
Very few lenders allow 100% LTV on home equity loans or HELOCs. Those that do charge significantly higher rates and fees. Most financial advisors strongly recommend against borrowing all your equity because it eliminates your financial cushion and puts you at risk of being underwater if home values decline.
Does my Zillow estimate count for home equity calculations?
No. Lenders use a professional appraisal or automated valuation model (AVM) — not Zillow’s Zestimate — to determine your home’s value. Zillow estimates can be off by 5–15% or more. The appraised value is what determines your available equity and borrowing limit.
Can I increase my borrowing amount by making improvements?
Potentially. Strategic home improvements can increase your appraised value and thus your available equity. Kitchen and bathroom remodels, additions, and structural improvements typically add the most value. However, the increase in value is rarely dollar-for-dollar with the cost of improvements.
What if my appraisal comes in low?
If the appraisal is lower than expected, your available equity decreases and you’ll be approved for a smaller loan. You can contest the appraisal with comparable sales data, request a second appraisal (at your cost), or try a different lender who may use a different appraiser.
Can I borrow against equity in a second home?
Yes, though LTV caps are typically lower (70–80%) and rates are higher compared to primary residence loans. You’ll also need stronger credit and lower DTI ratios. Not all lenders offer home equity products on second homes.
Last updated: March 2026. Rates and requirements are subject to change. Always verify current terms with lenders directly.