How Much of a Home Loan Can I Get?
Estimate the maximum mortgage you can qualify for based on your income, debts, down payment, and credit profile. Get an instant affordability range you can take to lenders.
Wondering how much of a home loan you can get? Lenders typically approve a mortgage based on three pillars: your debt-to-income (DTI) ratio, your down payment, and the interest rate available to your credit profile. A common rule is the 28/36 guideline — housing costs under 28% of gross monthly income, and total debts under 36%. For example, a household earning $90,000 per year ($7,500/month) with $400 in existing monthly debts could often qualify for a mortgage payment near $2,300, translating to roughly $340,000–$370,000 in loan principal at a 6.5% rate over 30 years.
This calculator combines the lender's DTI cap, your loan term, your interest rate, and your estimated property taxes and insurance to produce a realistic borrowing range. It is meant to give you a defensible upper bound before you talk to a loan officer, not a pre-approval. Real underwriting will also weigh your credit score, employment history, reserves, and the appraisal. Adjust the DTI cap, down payment, and rate fields to model FHA, conventional, or jumbo scenarios — most conventional lenders cap total DTI at 43–45%, while FHA can stretch to 50% with compensating factors.
How it works: Enter your income, debts, down payment, rate, and term. We compute the largest monthly payment your DTI allows, then solve backwards for the loan principal using the standard mortgage amortization formula.
This calculator provides an estimate based on standard DTI math; it is not a pre-approval or commitment to lend. Actual qualification depends on credit history, employment verification, appraisal, reserves, and lender overlays. Borrowing at the maximum is rarely advisable. Industry data shows that homeowners with housing costs above 36% of gross income are significantly more likely to fall behind on payments, especially during income disruptions. Keeping total housing under 28% of gross (or 25% of take-home) preserves margin for retirement savings and emergencies. Front-end DTI above 36% is generally considered the 'house-poor' threshold — at that level, you may struggle to fund retirement at 15% of income while covering housing, transportation, and basic living costs. Adjustable-rate mortgages (ARMs) qualify at the fully-indexed rate, not the teaser rate. If you're considering an ARM, run this calculator at a rate 2–3% higher than your initial quote to test what happens at rate reset.
Understanding How Much Home Loan You Can Qualify For
Mortgage qualification is more math than mystery. Lenders apply consistent ratios and formulas — once you understand them, you can predict your approval amount within a few thousand dollars.
Maximum loan estimates by income (30-year, 6.5% rate, $400/mo debt, 1.5% tax+ins, conventional 43% DTI)
| Annual income | Monthly income | Max housing payment | Estimated max loan | Implied home price (10% down) |
|---|---|---|---|---|
| $50,000 | $4,167 | $1,392 | ~$185,000 | ~$205,000 |
| $75,000 | $6,250 | $2,288 | ~$305,000 | ~$340,000 |
| $100,000 | $8,333 | $3,183 | ~$425,000 | ~$472,000 |
| $150,000 | $12,500 | $4,975 | ~$665,000 | ~$740,000 |
| $200,000 | $16,667 | $6,767 | ~$905,000 | ~$1,005,000 |
DTI caps and down payment requirements by loan program (2026)
| Program | Max total DTI | Min down payment | Min credit score | Best for |
|---|---|---|---|---|
| Conventional | 43–45% | 3–5% | 620 | Good credit, stable income, avoiding MIP |
| FHA | 50% (with compensating) | 3.5% | 580 | First-time buyers, lower credit, higher DTI |
| VA | 41% (flexible) | 0% | 580–620 | Veterans and active-duty service members |
| USDA | 41% | 0% | 640 | Rural/suburban properties, moderate income |
| Jumbo | 38–43% | 10–20% | 700 | Loans above $766,550 conforming limit |
How interest rate changes affect a $400,000 loan (30-year)
| Interest rate | Monthly P&I | Total interest paid | Lifetime cost |
|---|---|---|---|
| 5.5% | $2,271 | $417,560 | $817,560 |
| 6.0% | $2,398 | $463,280 | $863,280 |
| 6.5% | $2,528 | $510,080 | $910,080 |
| 7.0% | $2,661 | $557,920 | $957,920 |
| 7.5% | $2,797 | $606,920 | $1,006,920 |
What Is Debt-to-Income (DTI) and Why It's the Main Gatekeeper?
Debt-to-income ratio is the single most important number in mortgage qualification. It compares your total monthly debt obligations — including your future mortgage payment — to your gross monthly income. Lenders use two versions: front-end DTI (just housing) and back-end DTI (all debts including housing). Conventional loans typically cap back-end DTI at 43%, FHA stretches to 50% with compensating factors like reserves or a strong credit score, and the safer 28/36 rule keeps housing at 28% and total debt at 36%. A borrower earning $7,500/month with $500 in car/student loan debt could afford roughly $2,725 in housing under a 43% cap, but only $2,200 under the conservative 28/36 budget.
How Down Payment Affects Loan Size and Approval
Your down payment serves three purposes: it reduces the principal you need to borrow, it lowers the lender's risk (which can improve your rate), and at 20%+ it eliminates private mortgage insurance (PMI). PMI typically costs 0.3–1.5% of the loan annually, so on a $350,000 loan, dropping from 10% to 20% down saves about $1,750–$5,250 per year. However, a larger down payment doesn't automatically increase your maximum loan — DTI still caps the monthly payment. A common mistake: emptying savings for down payment, then failing the lender's reserve requirement (usually 2–6 months of housing payments in liquid assets).
Why the Interest Rate Has Outsized Impact
Interest rate is the most leveraged variable in your max loan calculation. Because mortgages amortize over 360 months, small rate changes compound dramatically. A 1% rate increase reduces your maximum loan by roughly 10–11% — meaning if you qualify for $400,000 at 6%, you only qualify for about $358,000 at 7%, assuming the same monthly payment cap. This is why rate-locking matters when you're house-hunting. Credit score directly drives your rate: going from a 640 to a 760 FICO can shave 0.5–0.75% off your rate, which translates to roughly $50,000 more in borrowing capacity on a typical middle-income application.
Understanding the Calculator's Output: What Each Number Means
The 'max loan amount' is the principal you can borrow — not the price of the home. Add your down payment to get the implied home price. The 'total monthly housing' (PITI) includes principal, interest, property taxes, and homeowners insurance — and if applicable, HOA dues and PMI, which this calculator approximates inside the tax+insurance rate. The 'effective DTI used' shows how close you are to the lender's cap; if it reads 42.8% under a 43% cap, you have almost no buffer for surprises. Lenders often want to see 2–4% of headroom for unexpected debts discovered during underwriting.
Common Mistakes That Reduce Your Approval Amount
First, opening new credit accounts in the 90 days before applying — every hard inquiry can drop your score 5–10 points and trigger rate add-ons. Second, underreporting debts: lenders pull your credit report and will find that car lease or buy-now-pay-later balance. Third, including unstable income (bonuses without a 2-year history, side gigs without 2 years of tax returns) — lenders may exclude up to 100% of unverifiable income. Fourth, ignoring property taxes when shopping in high-tax states. A $400,000 home in Texas (2.3% effective tax rate) costs about $4,000/year more in taxes than the same home in Colorado (0.5%) — that's $333/month of qualifying power lost.
Should You Borrow the Maximum? Affordability vs. Qualification
Lenders measure what you CAN borrow; they don't measure what you SHOULD borrow. The 28% front-end rule exists for a reason — at 36–43% housing DTI, you'll feel financially squeezed when you add utilities (~$300/mo), maintenance (1% of home value annually, so ~$292/mo on a $350K home), commuting, and childcare. A widely-cited rule of thumb: keep total housing under 25% of take-home (post-tax) pay if you want to maintain retirement savings of 15%+ of income. Many buyers regret borrowing within $30,000 of their maximum — choosing a home 10–15% below the cap leaves room for rate increases when refinancing, job transitions, and life changes.
How This Calculator Works: Methodology & Parameter Explanations
Core formula:
Max Loan = (Max Monthly Housing − Taxes/Insurance) × [(1+r)^n − 1] / [r × (1+r)^n], where Max Monthly Housing = min(Income × FrontDTI, Income × BackDTI − Existing Debts), r = monthly rate, n = term in monthswhere:
Income— Gross monthly household income ($/mo)FrontDTI— Front-end housing DTI cap (program-dependent) (%)BackDTI— Back-end total DTI cap (program-dependent) (%)r— Monthly interest rate (annual rate ÷ 12, credit-tier adjusted) (decimal)n— Total number of monthly payments (term × 12) (months)Taxes/Insurance— Monthly escrow for property taxes + homeowners insurance ($/mo)
How to apply: The formula produces a maximum loan principal — add your down payment to estimate the maximum purchase price. Lenders will further verify with appraisal (loan-to-value cap of typically 95–97% for conventional, 96.5% for FHA), reserves (2–6 months PITI), and employment history (2 years documented). The result is a ceiling; most financial advisors recommend targeting 80–90% of this number.
Worked example: Consider a household earning $96,000/year ($8,000/mo) with $350/mo in car payments, putting $25,000 down at 6.5% over 30 years under conventional rules (43% back-end DTI). Max housing = min($8,000 × 0.36, $8,000 × 0.43 − $350) = min($2,880, $3,090) = $2,880/mo. Estimating taxes+insurance at 1.5% of home value (≈$425/mo on a $340K home), the P&I budget is ~$2,455. Solving the amortization equation at r=0.005417 and n=360 yields a loan principal of approximately $388,000 — supporting a home price near $413,000.
Alternative formulas
28/36 Rule (Conservative): Max Housing = min(Income × 0.28, Income × 0.36 − Debts)
When to use: Originally codified in the 1970s by Fannie Mae; still the safest budgeting benchmark for buyers who want to maintain savings and discretionary income.
FHA 31/43–50: Max Housing = min(Income × 0.31, Income × 0.50 − Debts) with compensating factors
When to use: Best for borrowers with credit 580–680 or higher DTI; requires mortgage insurance for the life of the loan if down payment is under 10%.
Residual Income (VA): Income − Debts − Housing − Taxes ≥ Regional Minimum
When to use: VA loans uniquely require borrowers to retain a minimum dollar amount after all obligations (e.g., $1,003/mo for a family of 4 in the Northeast), making it more flexible than pure DTI.
Parameter explanations
| Input | Unit | What it means | Impact on results |
|---|---|---|---|
| Annual gross household income | $ | Pre-tax income from all borrowers on the application — base salary, documented bonuses (2-year average), and stable self-employment income. | Linear driver. Doubling income roughly doubles max loan, assuming debts stay flat. Each $10,000 of additional income adds roughly $40,000–$45,000 of borrowing capacity at current rates. |
| Existing monthly debt payments | $/mo | Minimum required payments on car loans, student loans, credit cards, personal loans, alimony, and child support — anything appearing on your credit report. | Each $100/mo of debt reduces your max loan by roughly $14,000–$16,000. Paying off a $300/mo car loan can boost approval by ~$45,000. |
| Down payment | $ | Cash brought to closing — from savings, gift funds (with documentation), or sale of prior home. | Directly adds to maximum home price (1:1) but does not increase max loan unless it crosses the 20% threshold (eliminating PMI freed up ~$100–250/mo in some cases). |
| Interest rate | % | Annual percentage rate quoted by your lender, tied to credit score, loan-to-value, and current market rates. | Highly nonlinear. Each 1% rate increase cuts max loan by ~10–11%; each 0.5% drop adds ~5–6%. |
| Loan term | years | Repayment horizon — 15, 20, 25, or 30 years. Determines amortization length. | A 30-year term qualifies you for roughly 35–40% more loan than a 15-year term at the same rate, because monthly payments are spread over more periods. |
| Target loan program (DTI cap) | — | The lending framework that sets your front-end and back-end DTI ceilings. | Moving from conservative 28/36 to FHA 50% can increase max loan by 40–60% — but at the cost of higher payments and tighter monthly budget. |
| Property tax + insurance rate | %/yr of home value | Annual escrow obligations as a percentage of the home's value, varying dramatically by state. | Each 0.5% increase in this rate reduces max loan by roughly 4–6%, since lenders include escrow in the DTI calculation. |
| Credit score tier | — | FICO-based credit band that drives rate add-ons (loan-level price adjustments) and program eligibility. | Moving from Fair (640) to Excellent (760+) typically improves your rate by 0.5–0.75%, expanding max loan by 5–8%. |
Assumptions
Property taxes and homeowners insurance are escrowed and included in DTI — true for nearly all lenders unless you waive escrow (rare).
The example income, debt, and home price figures shown throughout this page are illustrative defaults, not hard-coded limits. — The calculator works for any valid combination of inputs from $20,000 income to $1,000,000+ income. The $90,000/$400-debt scenario is just a common starting point.
Credit-tier rate adjustments are approximations of market loan-level pricing adjustments (LLPAs). — Actual rate add-ons vary by lender, loan-to-value, and current Fannie Mae/Freddie Mac pricing grids. Your locked rate may differ by ±0.25%.
PMI is approximated within the tax+insurance rate field for sub-20% down scenarios. For exact PMI quotes, consult your lender.
The calculator assumes a fixed-rate mortgage. ARMs and interest-only loans use different qualifying math (often the fully-indexed rate).
How to use this calculator
- Enter accurate income and debts — Use gross (pre-tax) income and pull your credit report so monthly debt minimums match what the lender will see — not what you actually pay.
- Try multiple loan programs — Switch between Conservative, Conventional, and FHA to see how DTI caps reshape your max. The spread is often $80,000–$150,000.
- Stress-test your rate — Run the calculator at +0.5% and +1% above today's quote — rates can move during a 30–60 day house hunt, and you want margin.
- Compare to the 28% rule — Look at the 'effective DTI used' metric. If it's above 36%, ask whether you'd be comfortable making that payment for 30 years through job changes and emergencies.
- Use the range, not the ceiling — Take the low-to-mid end of the range to your lender for pre-approval. This leaves room for closing costs, inspections, and unexpected underwriting findings.