The fastest way to estimate how much you can borrow based on income and credit is to multiply your gross monthly income by your lender’s maximum debt-to-income ratio, subtract your existing monthly debt payments, and treat what’s left as the payment a new loan has to fit inside. For a conventional mortgage in 2026, that calculation runs up against a conforming loan ceiling of $832,750 in most of the country, and your credit score decides how close to that ceiling you can realistically get.
Start With Your Debt-to-Income Ratio
Debt-to-income ratio is the single biggest lever. Lenders compare your total monthly debt payments to your gross monthly income (what you earn before taxes) and cap the total at a set percentage.
Two ratios matter. The front-end ratio measures just your proposed housing payment against gross income. The back-end ratio includes everything: housing, car loans, student loans, minimum credit card payments, and the proposed new loan. The “28/36 rule” is common shorthand (housing under 28 percent, total debt under 36 percent), but the actual ceilings run higher.
For conventional mortgages run through Fannie Mae’s automated underwriting system, the maximum back-end DTI is 50 percent. Manually underwritten conventional loans cap at 36 percent, stretching to 45 percent with strong credit and cash reserves.1Fannie Mae. Debt-to-Income Ratios FHA loans allow a back-end DTI of 43 percent, with room to push to 50 percent when you have compensating factors like substantial savings. VA loans use a 41 percent guideline but routinely approve higher ratios when borrowers meet residual income thresholds.
Run the math on your own numbers. If you earn $6,000 per month before taxes and your lender allows a 50 percent back-end DTI, your total monthly debt capacity is $3,000. Already paying $800 in car and student loan payments? Your remaining capacity for a new mortgage payment is $2,200. That figure, combined with the current interest rate and loan term, sets the principal you qualify for.
How Credit Score Changes the Amount You Qualify For
Your credit score doesn’t just move your interest rate. It decides which programs you can access, and because rate and principal are linked through the payment, it directly changes how large a loan your DTI can hold.
For conventional mortgages, Fannie Mae requires a minimum score of 620 for manually underwritten loans, and 640 for adjustable-rate mortgages. Loans processed through Desktop Underwriter have no Fannie Mae-imposed minimum, though individual lenders almost always set their own floor.2Fannie Mae. General Requirements for Credit Scores FHA is more forgiving: 580 or above qualifies you for maximum financing with 3.5 percent down, scores between 500 and 579 require 10 percent down, and anything below 500 is ineligible.3U.S. Department of Housing and Urban Development. Does FHA Require a Minimum Credit Score and How Is It Determined
Scores above 740 generally unlock the best rates. Higher rates send more of each payment to interest, so the same monthly payment supports a smaller principal. A stronger score effectively raises your borrowing power without anyone changing the DTI cap. One lever borrowers overlook in the months before applying: keeping revolving credit utilization below 30 percent of your available limits tends to help your score noticeably.
The Collateral Ceiling: Loan-to-Value and Insurance
For any secured loan, the property sets a hard ceiling. Loan-to-value compares how much you’re borrowing to the appraised value. If a home appraises at $400,000 and your lender caps you at 80 percent LTV, the maximum loan is $320,000 regardless of what your income could support. An independent appraiser licensed in your state sets that value, and a low appraisal can shrink your borrowing capacity overnight.
Conventional loans allow LTVs above 80 percent, but you’ll pay private mortgage insurance. PMI runs between 0.46 percent and 1.5 percent of the loan balance annually, depending on credit and LTV. On a $300,000 mortgage, that’s roughly $115 to $375 per month added to your payment, which then eats into your DTI headroom. Under the Homeowners Protection Act, your servicer must automatically cancel PMI once the balance is scheduled to reach 78 percent of the original property value and you’re current on payments.4Federal Reserve. Homeowners Protection Act of 1998
FHA works differently. Instead of PMI, you pay a mortgage insurance premium to HUD: 1.75 percent of the base loan amount upfront, plus an annual premium of 0.80 to 1.05 percent depending on LTV and loan size.5U.S. Department of Housing and Urban Development. Appendix 1.0 – Mortgage Insurance Premiums Put less than 10 percent down on an FHA loan and the annual premium lasts the entire loan term.
Program Caps for 2026
Even with strong income and credit, the loan program you use imposes a ceiling.
Conventional Conforming Limits
The Federal Housing Finance Agency adjusts conforming loan limits annually. For 2026, the baseline for a single-unit property in most of the country is $832,750. In designated high-cost areas, the ceiling rises to $1,249,125. Alaska, Hawaii, Guam, and the U.S. Virgin Islands have their own baseline of $1,249,125, with a ceiling of $1,873,675.6Federal Housing Finance Agency. FHFA Announces Conforming Loan Limit Values for 2026
Multi-unit properties carry higher limits:7Fannie Mae. Loan Limits
- Two-unit: $1,066,250 baseline, $1,599,375 high-cost
- Three-unit: $1,288,800 baseline, $1,933,200 high-cost
- Four-unit: $1,601,750 baseline, $2,402,625 high-cost
Anything above the applicable conforming limit is a jumbo loan. Jumbos aren’t backed by Fannie Mae or Freddie Mac, so lenders offset the risk with larger down payments, higher credit score minimums, and more extensive income documentation.
FHA
The 2026 FHA loan limit floor for single-unit properties is $541,287 in lower-cost areas, with a ceiling of $1,249,125 in high-cost markets.8U.S. Department of Housing and Urban Development. HUD Federal Housing Administration Announces 2026 Loan Limits The lower credit thresholds broaden access, but the mandatory mortgage insurance premium reduces the effective loan amount your DTI can absorb.
VA
Veterans and active-duty service members get the most generous terms. No down payment is required as long as the purchase price doesn’t exceed the appraised value, and there’s no private mortgage insurance.9U.S. Department of Veterans Affairs. Purchase Loan VA loans follow the Fannie Mae and Freddie Mac conforming limits for no-down-payment eligibility, so qualified borrowers can finance up to $832,750 in most areas with nothing down. The 41 percent DTI guideline can be exceeded when your residual income after all expenses exceeds the VA’s regional minimums by at least 20 percent.
USDA
USDA guaranteed loans provide 100 percent financing for homes in eligible rural areas.10USDA Rural Development. Single Family Housing Guaranteed Loan Program Household income generally cannot exceed 115 percent of the area median income. Mortgage insurance costs run lower than FHA.
Personal Loans If You’re Not Buying a Home
Unsecured personal loans follow the same DTI and credit logic, but without collateral behind them, lenders impose flat caps. Most banks and online lenders cap personal loans somewhere between $50,000 and $100,000 regardless of your income or credit. Some lenders cap lower, particularly for thin credit files. Rates run significantly higher than mortgage rates, so the monthly payment per dollar borrowed is steeper and your DTI fills up faster.
Federal law requires lenders to disclose the full cost of any consumer loan before you sign, including the annual percentage rate and total finance charges.11Federal Trade Commission. Truth in Lending Act Those disclosures must be clear, conspicuous, and provided in writing you can keep.12Consumer Financial Protection Bureau. 12 CFR Part 1026 – Truth in Lending Regulation Z – Section 1026.17 General Disclosure Requirements
What Income Actually Counts
Every dollar in the DTI calculation has to survive verification. Salaried borrowers submit the most recent one to two years of W-2 forms and a pay stub dated within 30 days of the application showing year-to-date earnings.13Fannie Mae. Standards for Employment and Income Documentation Federal tax returns confirm the historical income trend.
Self-employed borrowers face a higher bar: two years of both personal and business tax returns, plus profit-and-loss statements and balance sheets. Lenders may request 12 to 24 months of bank statements to confirm the income reported on tax returns actually flows through business accounts. Self-employed income is typically averaged over two years, so a recent spike won’t be fully credited.
Regardless of employment type, lenders verify tax records through the IRS using Form 4506-C, which authorizes an IVES participant to pull official transcripts.14Internal Revenue Service. Form 4506-C IVES Request for Transcript of Tax Return Each borrower whose income is used in qualifying must sign a 4506-C at or before closing.15Fannie Mae. Tax Return and Transcript Documentation Requirements
Don’t Inflate Your Application
Overstating income, hiding debts, or providing altered documents on a loan application isn’t just grounds for denial. Under 18 U.S.C. ยง 1014, anyone who knowingly makes a false statement to influence a federally connected lender faces up to 30 years in prison and a fine of up to $1,000,000.16Office of the Law Revision Counsel. 18 USC 1014 – Loan and Credit Applications Generally The statute covers essentially every major financial institution, from banks and credit unions to any entity making federally related mortgage loans. The IRS transcript verification described above exists specifically to catch discrepancies between what you report and what you filed. No loan amount is worth that risk.