What determines your HELOC borrowing limit

The amount you can borrow through a HELOC depends on three things: how much equity you have built up in your home, what the lender is willing to lend against that equity, and your credit and income profile. Most lenders will let you borrow between 80 and 90 percent of your home's current value, minus what you still owe on your mortgage. If your home is worth $300,000 and you owe $150,000 on your mortgage, you have $150,000 in equity. A lender offering 85 percent of home value would let you borrow up to $255,000 total against the home — but you already borrowed $150,000 for the mortgage, so your HELOC limit would be around $105,000.

The actual number varies by lender, by your credit score, by your debt-to-income ratio, and by local lending practices. Some lenders are more conservative and cap you at 80 percent of home value. Others go to 90 percent but only for borrowers with credit scores above 740. A few will go higher for strong borrowers, but this is less common after 2008.

Your lender will order an appraisal or automated valuation to confirm your home's current market value — not the price you paid or what you think it is worth. This number shifts with the market, so your available equity can go down if home values in your area decline.

Key Takeaways

  • Most lenders let you borrow 80 to 90 percent of your home's current value minus your existing mortgage balance.
  • Your credit score, debt-to-income ratio, and income level all affect how much a lender will actually offer you, even if you have the equity.
  • Lenders use a current appraisal or automated valuation to determine your home's value, not your purchase price or estimate.
  • The amount you can borrow may be lower than the amount you are offered — borrowing less than your limit keeps your monthly payment manageable and reduces your risk.

How lenders calculate your available equity

To find your available equity, lenders start with your home's current market value and subtract what you owe on all loans secured by the home — usually just your first mortgage, but sometimes a second mortgage or existing HELOC as well. The result is your equity. They then apply their lending limit (typically 80 to 90 percent of home value) to determine the maximum you can borrow against that equity.

Example: Your home is worth $400,000. You owe $200,000 on your first mortgage. Your equity is $200,000. If the lender uses an 85 percent limit, they will lend up to $340,000 total against the home. You have already borrowed $200,000, so your HELOC limit is $140,000.

Some lenders also factor in a reserve requirement — they may not let you borrow all the way to their limit right away. Instead, they might open a HELOC for $140,000 but only let you draw $100,000 in the first year, with the rest available after you have made payments on time. This is less common but does happen with some banks.

How your credit score and income affect the offer

Even if you have substantial equity, a lender may offer you less than the math suggests, or may decline to lend at all. Credit score is the first filter. Borrowers with scores below 620 often cannot get a HELOC at any price. Scores between 620 and 680 may may have access to but at higher interest rates and lower loan-to-value ratios — perhaps 75 percent instead of 85 percent. Scores above 740 usually get the best terms and highest limits.

Your debt-to-income ratio — the total of all your monthly debt payments divided by your gross monthly income — is the second filter. Most lenders want this ratio below 43 percent. If you earn $5,000 a month and already have $1,500 in monthly debt payments (mortgage, car loan, credit cards), adding a HELOC payment that would push you over 43 percent may disqualify you or reduce your limit. Some lenders are stricter and cap it at 36 percent.

Lenders also verify your income through recent tax returns, W-2s, or pay stubs. If your income is unstable, declining, or hard to document, they may offer less than a borrower with the same equity and credit score but steadier income. Self-employed borrowers often face tighter scrutiny and may need two years of tax returns.

Why the amount offered is not always the amount to borrow

A lender may offer you a $150,000 HELOC, but that does not mean you should take it. The offer is the maximum you are allowed to borrow; it is not a recommendation for how much you need. Borrowing the full amount means a higher monthly payment, more interest paid over time, and greater risk if your income drops or rates rise.

A common rule of thumb is to borrow only what you actually need, plus a small buffer for emergencies. If you need $30,000 for a home renovation, taking a $50,000 HELOC gives you a cushion without committing to payments on money you do not use. Taking the full $150,000 offer when you only need $30,000 is a common mistake that leads to overspending and financial strain.

Also consider the draw period and repayment terms. Most HELOCs have a 10-year draw period during which you can borrow and repay as needed, then a 20-year repayment period during which you cannot borrow anymore and must pay down the balance. If you borrow heavily early on, your payments during the repayment period can be substantial. Plan for that before you draw.

How home value changes affect your limit

Your HELOC limit is not fixed. If your home's value rises, your available equity rises, and the lender may increase your limit automatically or let you request an increase. If your home's value falls, your available equity shrinks, and the lender may reduce your limit or freeze your account. This happened to many borrowers during the 2008 housing downturn, when home values dropped and lenders cut HELOC limits even for borrowers who had never missed a payment.

Lenders typically re-evaluate your home's value every few years, or when you request a limit increase. Some use automated valuation models (AVMs) that check recent sales of similar homes in your area. Others order a full appraisal. If the new valuation is lower than the previous one, your limit may drop. You will usually receive notice of this change, but the reduction is not negotiable — it is based on the lender's assessment of the home's current value.

This is one reason to avoid borrowing your full limit: if your limit shrinks later, you may owe more than your available equity, which puts you in a difficult position. Borrowing conservatively gives you a buffer.

Comparing limits across different lenders

Different lenders use different formulas, so the amount one lender offers may be significantly different from another. A bank might offer 85 percent of home value, while a credit union offers 80 percent, and an online lender offers 90 percent. The difference can be tens of thousands of dollars.

Interest rates and fees also vary. One lender might charge 7 percent with a $500 origination fee; another might charge 7.5 percent with no origination fee. Over the life of the loan, these differences add up. It is worth getting offers from at least three lenders before deciding.

When comparing offers, look at the loan-to-value ratio (the percentage of home value they will lend), the interest rate, the origination fee, the annual fee (if any), and the draw period terms. A higher limit at a higher rate may cost more than a lower limit at a lower rate. Use a calculator or ask the lender for a total cost estimate over the life of the loan.

What happens if you need more than your limit

If your HELOC limit is $100,000 but you need $150,000, you have a few options. You can take out a second HELOC with a different lender, though this is less common now and may be harder to get approved for. You can take out a home equity loan (a fixed-rate, fixed-term loan) for the additional amount, which gives you a separate payment but a predictable monthly cost. You can refinance your first mortgage to a larger amount and pull out cash, though this resets your mortgage clock and may not be worth it if your current rate is low.

Another option is to wait. If your home value rises or you pay down your mortgage, your equity increases and your HELOC limit may rise with it. Some borrowers request a limit increase after a year or two of on-time payments, and lenders sometimes grant these without a new appraisal.

Frequently Asked Questions

Can I borrow more than my home's equity?

No. Lenders will not lend more than a percentage of your home's current value minus what you owe on it. If you have $100,000 in equity and the lender uses an 85 percent limit, the most you can borrow is roughly $85,000 of that equity (the math depends on your existing mortgage). You cannot borrow against equity you do not have.

What if I have a low credit score?

A low credit score (below 620) makes it very difficult to get a HELOC. Scores between 620 and 680 may may have access to, but at higher interest rates and lower limits. Scores above 700 get better terms. If your score is low, paying down debt and disputing errors on your credit report can help before you apply.

Does the lender check my income every year?

Most lenders verify income when you apply, but not every year after. However, if you request a limit increase, refinance, or miss payments, the lender may ask for updated income documentation. Some lenders also re-verify income if they are considering reducing your limit due to a drop in home value or a change in your credit profile.

Can my HELOC limit go down after I open it?

Yes. If your home's value falls, your credit score drops, or you miss payments, the lender can reduce your limit or freeze your account. This happened widely during the 2008 downturn. To protect yourself, avoid borrowing your full limit and keep your credit score and payment history strong.

What is the difference between a HELOC limit and a HELOC draw?

Your limit is the maximum you are allowed to borrow. Your draw is the amount you actually borrow. You can have a $100,000 limit and draw only $30,000, leaving $70,000 available if you need it later. You only pay interest on what you draw, not on the full limit.