ou check your credit score and see 680—right in the range many buyers need to move forward. That’s a solid starting point, but here’s the good news most homebuyers don’t hear when asking “What credit score do I need to buy a house?”

Mortgage approval isn’t decided by a single number.

Lenders look deeper—often in ways that work in your favor. Your credit report reveals payment consistency, how you manage balances over time, and whether past issues were temporary or truly resolved. In many cases, a borrower with a mid-600s score and strong recent habits can look more reliable than someone with a higher score but riskier patterns.

At Contour Mortgage, we’ve helped borrowers qualify by understanding—and highlighting—the strengths behind their credit profile. This guide breaks down which credit scores lenders actually use, how tri-merge reports work, and how compensating factors can strengthen your approval odds.

Key Takeaways
Lenders use tri-merge credit reports: Your mortgage lender pulls reports from all three bureaus (Experian, TransUnion, Equifax) and typically uses your middle score, not the highest—meaning you need all three scores above the minimum threshold.
Classic FICO models remain standard: Most lenders use FICO 2, 4, and 5 (not the VantageScore you see on Credit Karma), which can differ by 20-40 points from consumer-facing scores and explains why your “real” mortgage score might surprise you.
Payment patterns matter more than isolated incidents: Lenders distinguish between a one-time late payment from three years ago versus a pattern of 30-day lates every few months—the story matters as much as the score.
Recent credit behavior weighs heaviest: The past 12-24 months of your credit history receives the most scrutiny, making it critical to maintain perfect payment behavior once you decide to buy—even one late payment during this window can derail approval.
Compensating factors can overcome score weaknesses: Large down payments, substantial cash reserves, low debt-to-income ratios, and stable employment can offset borderline credit scores or past credit issues.
The full report reveals what the score hides: Underwriters see account-level details—utilization by card, payment history by account, inquiry reasons, and public records—that provide context the three-digit number can’t convey.
What Credit Score Do You Need to Buy a House? Understanding the Tri-Merge Credit Report
When you apply for a mortgage, your lender pulls a tri-merge credit report that includes your complete credit file and scores from all three major credit bureaus: Experian, TransUnion, and Equifax. The minimum credit score to buy a house varies by loan type—ranging from 580 for FHA loans to 620+ for conventional loans—but understanding how lenders determine which score to use is critical.

For single borrowers: Lenders use your middle score. If your scores are 680 (Experian), 695 (TransUnion), and 670 (Equifax), your qualifying score is 680.

For co-borrowers: Lenders use the lower middle score between the two borrowers. If you have a 700 middle score and your spouse has a 660 middle score, the lender qualifies you at 660 for rate and program eligibility.

Your scores vary across bureaus because not all creditors report to all three bureaus, reporting timing differs, and each bureau may have slightly different information. This is why you should check all three reports before applying—errors on just one bureau can drag down your qualifying score even if the other two are excellent.

Which Credit Score Is Used for Mortgages? FICO Models Explained
Most mortgage lenders use Classic FICO models—specifically FICO 2 (Experian), FICO 4 (TransUnion), and FICO 5 (Equifax). These models were developed in the 1990s and remain the mortgage industry standard, which is why the credit score for mortgage approval often differs from what you see on consumer apps.

Why your Credit Karma score doesn’t match
Credit Karma and most banking apps show you VantageScore 3.0 or newer FICO models. These scores can differ from your mortgage scores by 20-40 points because they weigh factors differently. Classic FICO penalizes recent late payments heavily and treats paid collections the same as unpaid collections. VantageScore gives less weight to paid collections, potentially showing you a higher score than mortgage lenders will see.

This explains the common scenario where borrowers say “but my app shows 720” and then discover their mortgage score is 680. It’s not an error—it’s simply different scoring models evaluating the same credit history.

For example, if you paid off a $800 medical collection last year, VantageScore 3.0 might give you credit for resolving it and show a 710 score. Classic FICO treats that paid collection the same as if it were still unpaid, resulting in a 680 score—the number your mortgage lender will actually use.

New scoring models on the horizon
VantageScore 4.0: Fannie Mae began accepting this model as an option (alongside Classic FICO) in November 2025. Lenders can now choose between scoring models on a loan-by-loan basis, though adoption remains in early stages as of January 2026.

FICO 10T: FHFA has validated this newer FICO model for future use by Fannie Mae and Freddie Mac and is working toward its adoption, including releasing historical performance data. FICO 10T uses ‘trended data’ that looks at roughly the past 24 months of credit behavior, which can benefit consumers who consistently pay down balances and disadvantage those whose debt levels are rising over time.

Current reality: As of January 2026, Classic FICO remains dominant. Most lenders continue using traditional models—don’t assume newer models that might score you more favorably will be used.

What Lenders Look for Beyond Your Credit Score
Your credit report tells a detailed story that matters as much as the three-digit number. Here’s what underwriters scrutinize when evaluating your mortgage application:

Payment history patterns
What matters most: The pattern and recency of late payments. An isolated 30-day late payment from four years ago during documented hardship (job loss, medical emergency) is very different from multiple 30-day lates over the past 18 months.

Red flags: Recent patterns suggesting ongoing financial stress, late mortgage/rent payments (treated more seriously than credit cards), late payments during the application period.

For homebuyers: If you have late payments, prepare written explanations with documentation. The Consumer Financial Protection Bureau confirms you have the right to add explanatory statements to your credit file.

Credit utilization & account management
Underwriters look beyond overall utilization to individual account patterns. Maxing out one card while keeping others at zero signals different management than spreading utilization evenly.

Concerning patterns:

Consistently maxed-out cards (even with on-time payments)
Recent sharp increases in balances
Cash advance activity
Multiple balance transfers
Positive patterns:

Low utilization across all accounts (under 30%, ideally under 10%)
Stable or decreasing balances over time
Available credit that’s unused
Public records & collections
Bankruptcies, foreclosures, judgments, and collection accounts appear with dates and amounts. Per the Fair Credit Reporting Act, most negative items remain on your report for seven years, but their impact diminishes over time with re-established positive credit.

Bankruptcy waiting periods:

Chapter 7: FHA allows approval two years after discharge; conventional typically requires four years
Chapter 13: FHA allows approval one year into payment plan; conventional typically requires two years after discharge
Collections: Medical collections under $2,000 are excluded from debt-to-income calculations per Fannie Mae/Freddie Mac guidelines, though collection accounts still appear on credit reports. Non-medical collections may need to be paid or have payment plans established before closing, depending on loan program and lender requirements.

Key insight: Documented hardship (job loss, medical emergency, divorce) with subsequent re-establishment of credit receives more favorable treatment than patterns suggesting ongoing financial problems.

ompensating Factors That Overcome Credit Weaknesses
Strong compensating factors can offset borderline credit scores or past credit issues:

Large down payment (20%+ equity): Dramatically reduces lender risk. A 640 score with 25% down may receive approval, where 640 with 5% down would be declined.

Substantial cash reserves: Having six to 12 months of housing payments in liquid reserves strengthens applications with borderline credit. Counts savings, checking, money market accounts, stocks/bonds, some retirement accounts.

Low debt-to-income ratio: DTI under 36% is excellent. Lower DTI can offset credit scores at minimum thresholds, limited credit history, or self-employment income challenges.