Loan Eligibility Calculator
Find out how much you can realistically borrow before you apply — based on the same debt-to-income test lenders actually run, not on what a payment you can “probably manage” feels like.
- Updated Aug 9, 2026
- Reviewed by the BSF CPA Editorial Team
- US lending standards
- 9 min read
Lenders cap your total monthly debt at a percentage of gross income, so your borrowing power is whatever is left after existing payments. On $7,000 a month with $500 of existing debt and a 36% limit, your ceiling is $2,520 of total debt — leaving $2,020 for a new payment, which supports about $89,969 over 5 years at 12.41%.
Enter your gross monthly income, current minimum debt payments, the DTI limit your lender uses, and the rate and term on offer. The result is the largest loan those payments can support.
Loan Eligibility Calculator
Estimate how large a loan you can qualify for, based on your income, existing debts, and a lender’s debt-to-income limits.
Enter your details and press Calculate to see your borrowing power.
How the loan eligibility calculator works
Lenders cap your total debt payments at a share of your income — your debt-to-income (DTI) ratio. The calculator takes your income times the DTI limit to find the maximum total debt payment you can carry, subtracts your existing debt payments, and what remains is the biggest new monthly payment you can afford. It then works backwards through the loan formula to find the largest loan that payment supports.
Available for new loan = Max total − Existing debts
Max loan = Payment × (1 − (1 + r)^−n) / r, r = rate/12
This is an estimate of borrowing capacity, not a guarantee — lenders also weigh credit score, employment, and down payment. Once you know a target amount, use our Loan Payment Calculator to plan the repayment, or the Mortgage Calculator for a home.
Understanding debt-to-income limits
The classic guideline is the 28/36 rule: no more than 28% of gross income on housing, and no more than 36% on all debt combined. Many mortgage programs allow a back-end DTI up to 43%, and some go higher with strong credit. A lower DTI not only qualifies you for more — it also leaves you more breathing room if your income dips or rates rise.
- Lower your DTI: paying down existing debts frees up room for a larger new loan.
- Longer terms raise eligibility: they lower the monthly payment, but cost more interest overall.
- Gross vs net: lenders use gross (pre-tax) income, so your real take-home budget is tighter than the limit suggests.
Frequently asked questions
What is a debt-to-income ratio? +
What DTI do lenders usually require? +
Does this guarantee I’ll be approved? +
Should I borrow the maximum I’m eligible for? +
What counts as existing debt? +
How to read your results
| Output | What it means | Why it matters |
|---|---|---|
| Maximum loan amount | The largest balance your leftover payment capacity supports | Your realistic ceiling — not a pre-approval. |
| Max total debt payments | Gross monthly income × your DTI limit | The hard cap the lender applies to all your debt combined. |
| Your current debt payments | What you already owe each month | Every dollar here is a dollar off your borrowing power. |
| Available for new loan payment | Max total debt − current payments | The payment the new loan has to fit inside. |
| Current debt-to-income | Current payments ÷ gross income | Where you stand today, before borrowing anything. |
If your existing payments already exceed the limit, the calculator says so plainly rather than returning a negative number — in that situation there is no borrowing capacity to compute until some debt comes off.
What lenders are actually testing
Underwriting turns on debt-to-income: the share of your gross monthly income consumed by required debt payments. It is measured before tax, and it counts obligations rather than lifestyle. Minimum credit card payments, auto loans, student loans, personal loans, child support and alimony all count. Groceries, utilities, insurance premiums and subscriptions generally do not.
Two ratios exist. Back-end DTI counts all debt including the proposed new payment — that is what this calculator models and what most decisions rest on. Front-end DTI counts only housing costs and matters mainly for mortgages.
DTI is one of several tests. Credit score, employment history, reserves, loan-to-value and lender-specific overlays all apply, and a lender may approve less than this figure — or occasionally more, with strong compensating factors. Treat the result as the ceiling to plan against.
The formula
available = max total debt − existing debt payments
i = rate ÷ 12 · n = years × 12
maximum loan = available × [1 − (1 + i)−n] ÷ i
- income Gross monthly income, before tax and deductions.
- DTI The limit your lender applies — see the table below.
- available What is left for the new payment once existing debt is covered.
- n Months. The term field is in years and is multiplied by 12.
The last line is the present value of an annuity: it asks what balance a fixed payment can retire over the term at that rate. At a 0% rate it reduces to available × n, which the calculator handles.
DTI limits by loan type (2026)
The DTI field defaults to 36% — the classic conservative benchmark — but the right number depends on what you are borrowing for.
| Loan type | Typical limit | Stretch | Notes |
|---|---|---|---|
| Conventional (automated) | 45% | 50% | Fannie Mae’s Desktop Underwriter allows up to 50%. |
| Conventional (manual) | 36% | 45% | Above 36% requires stronger credit and cash reserves. |
| FHA | 43% | ~57% | 31% front-end guideline; AUS can approve far higher with compensating factors. |
| VA | 41% | no hard cap | The real gate is the residual income test, not the ratio. |
| Personal loan | 36–43% | ~50% | Varies widely by lender; no regulatory ceiling. |
| Auto | <35% | 45–50% | Often stricter, since the collateral depreciates. |
The choice matters enormously. On $7,000 of income with $500 of existing debt, at 12.41% over 5 years:
| DTI limit | Available payment | Maximum loan |
|---|---|---|
| 28% | $1,460 | $65,027 |
| 36% | $2,020 | $89,969 |
| 43% | $2,510 | $111,793 |
| 50% | $3,000 | $133,617 |
Borrowing capacity slightly more than doubles between the most and least conservative standard. Qualifying for the top of that range is not the same as it being wise to borrow there.
Three worked examples
$7,000 income, $500 existing debt, 36% DTI, 12.41% over 5 years
Max total debt is $2,520, leaving $2,020 for the new payment against a current DTI of just 7.1%. That supports a loan of about $89,969 — far more than most people would want at a 12.41% personal loan rate. Capacity and advisability are different questions.
$6,000 income, $650 existing debt, 36% DTI, 6.23% over 5 years
Max total debt is $2,160 and existing payments take $650, so $1,510 remains — supporting roughly $77,675. Current DTI is 10.8%. Note that auto lenders often apply a separate payment-to-income test of 15–20%, which on this income caps the car payment near $900–$1,200 regardless of what DTI allows.
$4,200 income, $900 existing debt, 28% DTI, 11.5% over 3 years
Max total debt is $1,176 but existing payments already consume $900, leaving only $276 — a maximum loan of about $8,370. Current DTI is 21.4%, which sounds moderate, yet at a conservative limit it has already absorbed three-quarters of the allowance. This is the case the calculator is most useful for: it shows the constraint long before an application does.
Using this for a mortgage — read this first
The calculator converts your available payment into a loan balance using principal and interest only. A mortgage payment also includes property taxes, homeowners insurance, mortgage insurance and any HOA dues — and lenders count the full PITI figure against your DTI, not just P&I.
Take $9,500 income, $1,450 existing debt and a 43% limit at 6.75% over 30 years. The calculator reports $406,261, treating all $2,635 as principal and interest. Add a realistic $450 a month of taxes and insurance and only $2,185 is left for P&I — a true ceiling of $336,880. The tool overstates by $69,381.
Fix: subtract your estimated monthly escrow from the available payment first, or add it to the “existing monthly debt payments” field. Then the output is directly usable.
| Monthly taxes + insurance | Left for P&I | Realistic maximum loan |
|---|---|---|
| $0 (calculator’s default) | $2,635 | $406,261 |
| $300 | $2,335 | $360,007 |
| $450 | $2,185 | $336,880 |
| $700 | $1,935 | $298,336 |
Which lever moves your capacity most
Three things change what you can borrow: income, existing debt and term. They are not equally efficient. Starting from Example 1 — $7,000 income, $500 debt, 36%, 12.41%, 5 years, a $89,969 ceiling:
| Change | New maximum | Gain |
|---|---|---|
| Cut existing payments by $250/mo | $101,104 | +$11,135 |
| Increase income 10% (+$700/mo) | $101,193 | +$11,224 |
| Extend term 5 → 7 years | $113,021 | +$23,052 |
Eliminating $250 of monthly debt did almost exactly what a $700 raise did. That is not a coincidence: every $1 of debt removed comes straight off the ceiling, while $1 of extra income only counts at the DTI rate. Each $1/month of debt eliminated is worth $1 ÷ DTI of income — at 36%, about $2.78. Paying off a small balance is usually the fastest way to move this number.
Extending the term looks like the biggest win, and for qualifying purposes it is. It is also the only one of the three that increases what the loan costs you, because you pay interest for longer.
Common mistakes
Using net income
DTI is calculated on gross pay, before tax. Entering take-home understates your capacity by roughly a quarter.
Counting living expenses as debt
Only required debt payments belong in that field — not groceries, utilities, insurance premiums or subscriptions.
Entering card balances instead of payments
Use the minimum monthly payment, not the balance. A $9,000 card balance might be a $225 obligation.
Forgetting escrow on a mortgage
Taxes and insurance count toward DTI. Leaving them out overstates a mortgage ceiling by 15–25%.
Treating the maximum as a target
The figure is a lender’s ceiling, not a budget. It leaves nothing for savings, irregular costs or a drop in income.
Ignoring deferred student loans
Most programs count a percentage of the balance as a payment even when nothing is currently due. Check the rule for your loan type.
Best practices
Pay off small balances first
Removing a $150 payment frees about $417 of allowance at a 36% limit. Clearing one small loan often beats months of extra income.
Run your lender’s actual limit
Do not leave the field at 36% if you are applying for an FHA or conventional loan. Use the table above and re-run.
Borrow well below the ceiling
A payment at 36% of gross is a large share of take-home. Many planners suggest stopping around two-thirds of the maximum.
Avoid new credit before applying
Opening an account or financing furniture between pre-approval and closing changes your DTI and can undo the decision.
Frequently asked questions
Is DTI based on gross or net income?
Gross — your income before tax and deductions. Using take-home pay will understate what you can borrow by roughly a quarter, depending on your tax situation.
What counts as a debt payment?
Required obligations: minimum credit card payments, auto and student loans, personal loans, existing mortgages, child support and alimony. Utilities, groceries, insurance premiums, phone bills and subscriptions do not count.
What is a good DTI ratio?
Below 36% is comfortable and opens the widest range of lenders. Up to 43% is workable for most mortgage programs. Above 50% is difficult almost everywhere, though FHA can approve higher with strong compensating factors.
Can I use this for a mortgage?
Yes, with one adjustment. It sizes the loan from principal and interest only, but lenders count taxes, insurance and HOA dues too. Add your estimated monthly escrow to the existing-debt field, then read the result.
Why is my maximum so much lower than a mortgage affordability estimate?
Usually the DTI limit or the term. Mortgage estimates often assume 43–50% and a 30-year term; this calculator defaults to 36% over 5 years. Match both fields to the loan you are actually seeking.
Does my credit score change the result?
Not directly — DTI is about payments, not score. Indirectly it matters a great deal: a lower score means a higher rate, and a higher rate shrinks the loan a given payment supports.
What if my existing payments already exceed the limit?
The calculator tells you so instead of showing a negative figure. There is no capacity until debt comes down. Paying off the smallest balance first usually restores the most room fastest.
How do deferred or income-driven student loans count?
Rules vary. Many programs use a percentage of the outstanding balance, or the documented income-driven payment, even if it is $0. Check the specific guideline for your loan type rather than entering zero.
Does the calculator include the new loan in the ratio?
Yes. It solves for the largest new payment that keeps total debt — existing plus new — at or below your limit. That is the back-end ratio lenders decide on.
Will a co-borrower increase what I can borrow?
Usually. Lenders combine both incomes and both debt loads, so a co-borrower with income and little debt raises capacity, while one carrying significant obligations can reduce it.
Is this a pre-approval?
No. It models the DTI test only. Credit history, employment stability, reserves, collateral value and lender overlays all affect the decision. Use it to plan before applying.
Should I borrow the maximum?
Generally not. The ceiling assumes every dollar up to the limit is available for debt, which leaves nothing for saving, irregular expenses or a fall in income. Many planners suggest borrowing around two-thirds of it.
Methodology & sources
Maximum total debt is gross monthly income multiplied by the DTI limit. The available payment is that figure less existing obligations, and the maximum loan is the present value of that payment as an ordinary annuity at the monthly rate over the term, with payments at the end of each month. The term field is in years and converted to months. Where existing payments meet or exceed the limit, the calculator reports the shortfall rather than a negative loan amount.
- Fannie Mae Selling Guide B3-6-02 — debt-to-income ratio limits for DU and manual underwriting.
- HUD / FHA — front-end and back-end ratio guidelines and automated underwriting thresholds.
- US Department of Veterans Affairs — 41% guideline and residual income requirements.
- Consumer and lender guidance on personal and auto loan DTI and payment-to-income standards, 2026.
Related resources
- Personal Loan CalculatorTurn a capacity figure into a real payment
- Auto Loan CalculatorVehicle price, tax and trade-in
- Loan Prepayment CalculatorClear debt faster and free up capacity
- Net Worth CalculatorThe whole balance sheet, not just the ratio
- Credit Card vs Personal LoanWhich obligation to clear first
- All CalculatorsThe full BSF library
Know your ceiling before a lender sets it
Run your real numbers, then decide how far below the maximum you actually want to borrow.
Goes deeper on this
The FIRE Movement: Path to Early Retirement
The number, the math, and the tax machinery to buy back your time — decades before a traditional retirement.
Email me this result
We will send the numbers this page just showed you, plus a link back to it. No account needed.
Keep exploring
