Start with the payment the lender will count
Possibly. Debt-to-income ratio, or DTI, compares monthly debt obligations with gross qualifying monthly income. Limits vary by lender and product. Home equity can support the loan as collateral, but the lender also reviews your ability to make the payments.
Ask what monthly payment the lender would use to qualify you for the proposed line. The amount used for underwriting can differ from your expected first bill. Also ask how the lender treats debts you intend to pay off at closing. Wait for that answer before removing payments from your estimate.
Worked example
Suppose your qualifying income is $8,000 a month and your housing payment and other counted debts total $3,600. Your starting DTI is 45%. If the lender counts $400 for the proposed HELOC, the ratio rises to 50%. If the lender also confirms it can exclude a $250 monthly debt that will be paid off at closing, the ratio would be about 46.9%. These are three calculations for the same household. None establishes eligibility.
Review the line size and the household budget
Ask how a smaller line would affect the qualifying payment. Verify income and monthly obligations, and gather the current first mortgage balance, any other lien balances, and a realistic estimate of the home’s value. For a debt payoff, bring recent statements so the lender can confirm the balance and payment for each account. Compare your own budget with the payment you could face if the rate rises or the line enters repayment.
Read the HELOC program guide or compare a HELOC with a fixed-rate second mortgage.