How to Qualify for a Mortgage: Credit, Income, and DTI Requirements

Bottom line: Most homebuyers qualify for at least one mortgage type, and the question is which one and at what rate. Conventional loans at the best rates require 700+ credit, sub-40% DTI, and 20% down. FHA loans accept 580 credit and 3.5% down. VA loans require no down payment for eligible veterans. Know which category you fall into before you start shopping.

Mortgage qualification in the United States (USA) is not a single threshold. It is a matrix of credit score, income, debt load, and down payment, evaluated differently across loan programs. Understanding where you stand on each dimension lets you identify which loan types you qualify for today and what to improve if you want better terms. This guide breaks down exactly how to qualify for a mortgage by examining each of these critical components.

The Four Qualification Factors

1. Credit Score

Credit score is the most influential factor in your rate. Lenders use mortgage-specific FICO scores (FICO 2, 4, and 5) that may differ slightly from the scores you see in consumer apps.

The rate difference between a 680 and 760 score on a $400,000 conventional loan is typically 0.5–0.75%, or roughly $100–150/month and $36,000–54,000 over 30 years. The current average conventional 30-year rate runs around 7.40%; see live mortgage rates for today's numbers.

2. Income Verification

Lenders verify income stability and sufficiency, not just the amount.

W-2 employees: Two years of W-2s, recent pay stubs, employment verification. Job changes within the same field at the same or higher pay are generally acceptable. Recent job changes to a new industry may require a 30-day pay history at the new position.

Self-employed: Two years of federal tax returns (personal and business), year-to-date profit/loss statement. Lenders use the average net income from the two most recent tax years, not gross revenue. High business deductions that reduce tax liability also reduce qualifying income.

Variable income (commission, bonuses, overtime): Averaged over two years. If your bonus was unusually high in year two, lenders may discount it or use the lower average.

Rental income: Typically counted at 75% of gross rents to account for vacancy and expenses, with documentation of 12–24 months of receipts.

Support or alimony you receive

Support income can solve a qualification gap, but the award amount is not automatically the lender's qualifying amount. For a conventional loan delivered to Fannie Mae, the borrower must disclose the income on the loan application and ask the lender to consider it. The lender documents the legal obligation, the amount, the receipt history, and whether payments are expected to continue for at least three years after the mortgage application date. Fannie Mae generally requires a six-month history of full, regular, timely payments. Child support may end when a child reaches a stated age or graduates; use the actual order and relevant dates rather than assuming the full award lasts indefinitely. (See Fannie Mae Selling Guide B3-3.4-02.)

For example, a $1,200 monthly court-ordered child-support award with six months of full, timely deposits and a documented end date more than three years away may be eligible for consideration under that conventional guide. A new award with only two months received, a payer in arrears, inconsistent partial payments, or an order ending in two years may be excluded or discounted. The lender decides what documents suffice; common records include the order or separation agreement plus bank statements, canceled checks, or an authorized payment-history record. Cash with no reliable trail is difficult to establish.

Fannie Mae says the full amount of documented qualifying child-support income is nontaxable and may be grossed up under its general nontaxable-income method; that is a lender cash-flow adjustment, not a change to the tax treatment of the income. Alimony's federal tax treatment depends on the instrument and execution/modification dates; do not infer taxable or nontaxable status from the word “alimony” alone. Fannie Mae's income analysis is not a universal rule for FHA, VA, USDA, jumbo, or portfolio loans. Ask the lender which investor/agency rule and overlays apply before building a home budget around support. (See Fannie Mae B3-3.1-01 and IRS Publication 504.)

Support you pay is a different question from support you receive. Under Fannie Mae's conventional guide, court-ordered child support, alimony, or separate-maintenance payments generally count as monthly debt when the obligation continues more than ten months. For alimony or certain separate-maintenance obligations, the lender may have an option to reduce qualifying income instead of listing the payment as a separate liability. Bring the order and remaining duration to underwriting; avoid double-counting the same payment as both reduced income and debt. Voluntary payments without a legal obligation are treated differently under the guide. (See Fannie Mae Selling Guide B3-6-05.)

Illustration: Suppose monthly gross qualifying income before support is $7,200, proposed housing plus recurring debts total $3,360, and an underwriter accepts $1,200 of monthly support. The back-end ratio is $3,360 ÷ $7,200 = 46.7% without support, versus $3,360 ÷ $8,400 = 40.0% with support. This is arithmetic, not an approval threshold: the lender may reject the income, apply a different program's calculation, count additional liabilities, or use an automated underwriting result. Do not sign a purchase contract based on support until the lender has reviewed the order, receipt history, and continuation period.

Temporary leave, FMLA, and a mortgage application

A temporary leave does not automatically disqualify you, but employment status alone may not establish income available when the first mortgage payment comes due. FMLA can protect eligible workers’ jobs while leave is unpaid or runs concurrently with paid leave; it does not promise a full paycheck (U.S. Department of Labor Fact Sheet 28A). Tell the loan officer early if you expect parental, medical, or other employer-approved leave at closing or during the first months of repayment.

For a loan delivered to Fannie Mae, the temporary-leave rule asks the lender to document the leave income and duration, regular pre-leave income, your written intent to return, and the employer’s expected return date. The lender must not have evidence that you lack the right to return. An employer-initiated furlough or layoff is not treated as employee temporary leave under this rule. These are Fannie Mae conventional delivery requirements under Selling Guide B3-3.3-09; long-term disability uses separate guidance in B3-3.4-09. FHA, VA, Freddie Mac, jumbo, and portfolio rules can differ.

Timing drives the calculation. If you return by the first mortgage payment date, Fannie Mae permits qualification using regular employment income under its guide. If you remain on leave at that date, the lender generally uses the lesser of leave income and regular income. When leave pay is lower, eligible liquid reserves may supplement it: reserves divided by months until return, with combined qualifying income capped at regular employment income. Funds needed to close and required minimum reserves are excluded. Fannie Mae’s example uses $12,000 eligible reserves over four months, adding $3,000 a month to $2,000 leave income for $5,000 qualifying income, below a $6,000 regular-income cap.

Ask the lender to show the first-payment date and return date in the file. Provide leave approval, benefit/payroll statements, pre-leave pay evidence, your written return intent, employer confirmation, and reserve statements. If leave is extended, return cannot be confirmed, or disability benefits continue without a planned return, do not apply this temporary-leave formula automatically. Fannie Mae has separate long-term disability-income guidance; ask whether the benefit qualifies and is expected to continue. Lender overlays may be stricter than agency rules.

3. Debt-to-Income Ratio (DTI)

DTI measures your monthly debt obligations as a percentage of gross monthly income. Lenders calculate two ratios:

Front-end DTI (housing ratio): New mortgage payment (PITI) ÷ gross monthly income. Most conventional loans want below 28–31%.

Back-end DTI (total debt ratio): All monthly debt payments ÷ gross monthly income. Conventional loans typically cap at 43–45%; some automated approvals go to 50%. FHA allows up to 50% with compensating factors.

What counts as monthly debt: Minimum credit card payments, auto loans, student loans (even deferred, since lenders use 0.5–1% of the balance as a monthly payment for qualifying), personal loans, child support, alimony. Does not include utilities, insurance, subscriptions.

4. Down Payment and Assets

Conventional loans: Minimum 3% (first-time buyers), typically 5–10% otherwise. 20% eliminates PMI.

FHA: 3.5% minimum with 580+ score. Can come entirely from gift funds.

VA and USDA: 0% down payment. Funding fees apply to VA loans (can be financed into the loan).

Reserves: Most lenders want 2–6 months of housing payments in savings after closing. This is separate from the down payment and closing costs.

What to Fix Before Applying

Credit score below 620: Pay down revolving balances below 30% of limit, dispute errors on your reports, and ensure all accounts are current. Allow 3–6 months of improvement before applying.

DTI above 45%: Pay down or pay off installment loans nearing completion (paying off a car loan with 8 payments remaining eliminates that payment from DTI). Increase income documentation if any qualifying income is being excluded.

Insufficient down payment: FHA requires only 3.5%; down payment assistance programs exist at state and local level. A co-borrower with assets can strengthen the application.

Thin credit history: Become an authorized user on a trusted family member's old, low-balance card. A 2-year credit history is generally sufficient for mortgage qualification.

Run your own debt-to-income number with the DTI calculator, and check the CFPB's guide to mortgage qualification and HUD's homebuying resources for the underlying program rules.

Which loan type fits your profile

Quick answer

Most buyers qualify for at least one loan type; the real question is which one and at what rate. As a rule of thumb, conventional financing at the best pricing needs roughly 700+ credit, back-end DTI under 40%, and 10-20% down. FHA drops the bar to 580 credit and 3.5% down but adds mortgage insurance for the life of the loan in most cases. VA loans need no down payment at all for eligible veterans. Every $500 a month you cut from existing debt before applying raises your qualifying purchase price by roughly $70,000 to $100,000 at today's rates, so paying down revolving balances is usually worth more than shopping harder for a rate. If you want to see this mapped to your own numbers, Money Map will show which lever moves your qualification the most.

Sources

Qualification thresholds above reflect Fannie Mae and Freddie Mac's published conventional guidelines, FHA's minimum property and borrower standards, and VA eligibility rules. For the underlying program details, see the CFPB's mortgage qualification guide and HUD's FHA loan resources. For temporary leave and disability, see Fannie Mae Selling Guide B3-3.3-09 and B3-3.4-09; for FMLA protections, see U.S. Department of Labor Fact Sheet 28A. For support income, see Fannie Mae Selling Guide B3-3.4-02 and the payment treatment in B3-6-05. These are conventional underwriting rules, not universal rules for FHA, VA, USDA, jumbo, or portfolio loans. Lender overlays above agency rules are common, so treat the numbers here as a starting range, not a guarantee from any specific lender.

Mortgage qualification requirements vary by loan type, lender, and market conditions. Verify current requirements directly with lenders.