Mortgage Loan Eligibility Calculator
Can your budget actually carry a mortgage, not just qualify on paper? This mortgage loan eligibility calculator applies the classic 36% total-debt rule, then subtracts your real monthly living expenses and existing loan payments to find the monthly payment you can truly afford and the maximum loan it supports.
Eligibility estimate under the 36% total-debt guideline. Lenders also weigh credit score, down payment, reserves, and employment history.
Quick Answer
On $9,000/month income with $1,800 in living expenses and $700 in loan payments at 6.75% for 30 years: the 36% cap allows $3,240/month of total debt, leaving $740/month for the mortgage. That supports a maximum loan of about $114,092. Your current obligations already use 27.8% of income.
Key takeaways
- Eligibility is a budget test, not a lender approval. It subtracts living expenses that lender ratios ignore.
- $740 a month is the answer, not just a percentage. At 6.75% over 30 years it supports a $114,092 loan.
- Every $100 of monthly debt costs about $15,418 of loan. Paying down a loan payment raises the maximum loan faster than most borrowers expect.
- A negative result is useful information. It means obligations already exceed the 36% cap before any mortgage payment.
The 36% rule, with living expenses subtracted
The classic guideline says total monthly debts should not exceed 36% of gross monthly income. This calculator applies it the strict way: available for mortgage = (income × 36%) − living expenses − existing loan payments. The worked example: $9,000 × 0.36 = $3,240, minus $1,800 expenses and $700 loans, leaves $740/month. Converted at 6.75% over 30 years (present-value factor 154.18), that is a $114,092 maximum loan. Subtracting living expenses is what separates eligibility from mere qualification: a lender’s ratio ignores your grocery bill, but your budget does not. The Consumer Financial Protection Bureau explains how debt-to-income ratios work and why different lenders set different limits.
Eligibility vs qualification: the distinction that matters
Qualification asks what a lender will allow. Eligibility asks what your life allows. A borrower can pass a lender’s 43% back-end ratio while spending 95% of take-home pay once living costs are counted, which is how people end up “house poor”: approved for the loan, stressed by the payment. The debt headroom calculator measures the same breathing room from the budget side, and annual income to monthly converts salary figures for the inputs. The companion question, what a lender would pre-qualify you for from annual income and a down payment, is what the mortgage pre-qualification calculator answers: same household, lender’s side of the desk instead of the budget side.
What your eligibility result means
The calculator gives one of three verdicts, and each one points to a different next step. The verdict follows the room left inside the 36% cap, not your credit score or down payment, which a lender weighs separately.
| Verdict | Room left for a mortgage | What it means |
|---|---|---|
| Not eligible | $0 or less | Obligations already meet or exceed the 36% cap. Pay down a monthly debt or cut recurring costs, then re-run the numbers. |
| Tight | Under $500 a month | Eligible, but with little breathing room. A rate rise or an unexpected bill strains the budget quickly. |
| Comfortable | $500 a month or more | Room inside the cap with a cushion. Add your down payment to the maximum loan, then confirm the full monthly cost with the mortgage payment calculator. |
One sensitivity check is worth running before you shop: raise the rate by one point and watch the maximum loan fall. And remember the payment itself is not the whole cost of owning: property tax, insurance, and maintenance sit on top of principal and interest, while mortgage interest may be tax-deductible subject to the limits in IRS Publication 936. On the worked example, a higher rate shrinks the loan the same $740 payment supports, which is why locking a rate estimate early matters.
What competing calculators miss
Rival eligibility tools compute a DTI percentage and stop, or they estimate a loan from income alone without subtracting anything. Neither answers the budget question. Two specific gaps: living expenses are never an input anywhere in the top results, so every rival overstates what borrowers can comfortably carry; and the loan conversion is missing, leaving users with a payment cap but no loan amount. This tool chains all five steps, income to loan, in one place. It also states its limits plainly: credit score, down payment, reserves, and employment history still matter to a lender, and this estimate does not replace a lender’s finding.
Frequently asked questions
Whether your income, after living expenses and existing debts, leaves room for a mortgage payment inside the 36% total-debt guideline, and the maximum loan that room supports. It is a budget test, stricter than a lender’s qualification test.
Because lenders measure default risk, not your quality of life. Subtracting groceries, utilities, and transport shows the payment you can carry without stress, which is often well below the maximum a lender would approve.
Recurring non-debt costs: groceries, utilities, transport, insurance, childcare, subscriptions. Do not double-count debt payments (car loans, cards): those go in the loan-payments field.
Your current obligations already exceed 36% of income, so there is no room for a mortgage payment under this guideline. The fastest fixes: pay down the highest monthly debt, cut recurring expenses, or raise income. Re-run the numbers after each change.
No: it is the loan amount the payment supports. Add your down payment to reach the home price you can target. A larger down payment raises the price without changing the payment math.
No. It is the traditional guideline; FHA, VA, and some conventional programs allow higher ratios with compensating factors. Treat it as the comfort line, not a legal ceiling.
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References
- Consumer Financial Protection Bureau. What is a debt-to-income ratio? (accessed Oct 25, 2026)
- Freddie Mac. Guide Chapter 5401: Housing Expense and Debt Payment-to-Income Ratios (accessed Oct 25, 2026)
- U.S. Department of Housing and Urban Development. HUD Handbook 4000.1: FHA Single Family Housing Policy Handbook (accessed Oct 25, 2026)
- Consumer Financial Protection Bureau. Regulation Z, Section 1026.43: Minimum Standards for Transactions Secured by a Dwelling (accessed Oct 25, 2026)
- Consumer Financial Protection Bureau. What is a Qualified Mortgage? (accessed Oct 25, 2026)
- Experian. Mortgage Prequalification Calculator: How Lenders Estimate What You Can Borrow (accessed Oct 25, 2026)
- Internal Revenue Service. Publication 936: Home Mortgage Interest Deduction (accessed Oct 25, 2026)
- U.S. Department of Veterans Affairs. VA Home Loan Eligibility (accessed Oct 25, 2026)
- U.S. Department of Housing and Urban Development. Let FHA Loans Help You Buy a Home (accessed Oct 25, 2026)
- Consumer Financial Protection Bureau. Consumer Tools: Mortgages (accessed Oct 25, 2026)