Conventional Loan Credit Score Requirements for Two Borrowers

The Quick Read: When two people apply together, the lender does not average your scores. Each borrower gets one score, and the lower of those two scores becomes the loan’s score for pricing. The wholesale conventional programs Lendmire places files with start at a 620 decision score, subject to lender guidelines and full file review. A weaker score on one borrower can raise the cost of the loan even when the other borrower’s credit is excellent.

What Does “Minimum Credit Score” Actually Mean on a Conventional Loan?

A conventional loan is a mortgage that follows the standards of the two big agencies that buy home loans from lenders. Because lenders sell these loans, the lenders follow the agencies’ rules. Many add stricter rules of their own, called overlays.

Here is the practical picture. Across the wholesale programs these files go through, the starting point is a 620 decision score. On an adjustable rate under manual underwriting, it is 640. Those are starting lines, not promises. A 620 gets you into the conversation, and the rest of the file decides the outcome.

The agencies also changed how automated underwriting treats the number. That story comes later, because it surprises many borrowers. First, the basics: conventional loan programs on a principal residence allow 97% leverage (3% down) when at least one borrower is a first-time buyer. Otherwise they allow 95% leverage (5% down). Credit score is one of several gates, and leverage is another. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.

Two underwriting paths exist, and they treat the score differently.

Most files go through the automated path. Manual underwriting is the fallback when the software cannot give a clear answer.

How Does a Lender Pick Your Score When You Apply Alone?

The lender pulls a merged credit report from all three bureaus. That report is called a tri-merge. It shows a separate score from each bureau. The lender then picks one score for you.

With three scores, the lender uses the middle one. With two, it uses the lower one. Say your scores are 712, 698 and 705. Your score for the loan is 705.

The model matters too. Mortgage lenders use mortgage-specific scoring models, and these differ from the free score your banking app shows. Your app may read 20 or 30 points higher or lower. Neither number is wrong. They are different measuring sticks.

Some lenders can now choose a newer scoring model called VantageScore 4.0 instead of classic FICO. That choice sits with the lender, not you. If the lender uses it, every borrower on the loan is scored on the same model. And the three-bureau pull stays. The newer model is not allowed on manually underwritten loans, which still use classic FICO. Ask which model your lender uses before you compare scores with a friend.

How Is the Score Chosen With Two Borrowers?

With two borrowers, each person gets a single score first, and the lower of those two individual scores becomes the loan’s score. The Fannie Mae Selling Guide lays out the same two steps. First, each borrower’s score is the lower of two or the middle of three. Second, the lowest individual score across all borrowers becomes the representative score. That one score is used for pricing.

Here is a worked example with modeled scores, not real borrowers.

Borrower A’s middle score is 731. Borrower B’s is 668. The loan’s representative score is 668, the lower of the two. Borrower A’s strong credit does not pull it up.

Ties work the same way. If the individual scores are 700 and 680, the loan uses 680. The guide’s own example for three borrowers runs 700, 680, 680, which gives 680. With 700, 700, 680, the answer is still the lowest, which is 680. The tie-handling happens inside each borrower’s own three scores before the lowest is chosen across borrowers.

Now a wider gap.

The representative score is 619. That sits just under the 620 starting point on the wholesale programs. A very strong partner does not fix it. This couple would need to raise Borrower B’s score or look at a different structure, such as one borrower applying alone. Whether that works depends on income, debts and lender guidelines.

Why Do Two Lenders Give Two Different Answers About Averaging?

Because two different scores do two different jobs, and many web pages blur them together.

The first is the representative score, the lowest borrower score. It drives pricing on every loan. Fannie Mae’s loan delivery job aid states it plainly: the representative score is always used for delivery and pricing.

The second is the average median score. It is a two-step calculation: find each borrower’s median score, then average those medians. This applies to eligibility on manually underwritten loans with more than one borrower.

In the first example above, the medians were 731 and 668. The average is about 700. A manual loan could clear an eligibility check at about 700 while the pricing still runs off 668. Same file, two numbers, two purposes.

So when a friend says, “They averaged our scores,” they may be half right. Averaging can matter on a manual file. It does not set the price.

Where Does the General Rule Bend?

The rule above holds for most files, but several edge cases change the picture.

The 620 floor is gone from automated underwriting, but not from the market. Fannie Mae announced that it removed the minimum score for new automated underwriting casefiles. The change is in Selling Guide Announcement SEL-2025-09. Federal regulators described the shift as a change of language as the agencies move beyond a single score model, not a loosening of standards.

What does that mean for you? Fewer files get turned away on the number alone. But the software still weighs the score alongside income, debts, savings and down payment. Many lenders keep their own floor, and the wholesale programs here start at 620 for a reason: investors who buy these loans want to see it.

Manual underwriting still has fixed minimums. The baseline is 620 for a fixed rate and 640 for an adjustable rate. The Selling Guide’s general requirements tie the exact minimum to the score, the highest leverage, loan purpose, number of units, amortization type and the debt ratio. There is one named exception: manually underwritten HomeReady loans with a low-score borrower. A two-borrower file below a manual minimum can still be approved by the automated system. This is why the underwriting path matters.

One borrower has no score. The loan’s score comes from the borrowers who do have scores. This helps a buyer with thin credit who applies with a partner with established credit. Requirements for what the borrower without a score must show can differ, so confirm that with the lender.

Neither borrower has a score. The loan moves to nontraditional credit, such as a history of rent and utility payments. The automated system now flags files where no borrower has an open credit or installment account. It may call for nontraditional credit, homebuyer education, or both.

Past credit events. Waiting periods are agency rules: four years from a chapter 7 discharge, seven years from a foreclosure, and four years from a short sale or deed-in-lieu. Documented extenuating circumstances can shorten them. Those periods run on top of the score.

Government loans. Do not carry the conventional rules above into those programs.

Lender overlays. An individual lender can require more than the agency minimum. Some set a higher floor. Two lenders reviewing the same file can reach different answers.

Occupancy. Everything here assumes the home you will live in. A second home or an investment property carries different leverage limits, and occupancy decides which set applies.

Does a Co-Borrower Help or Hurt?

It depends on what each person adds. A co-borrower’s income can lower your debt-to-income ratio. But their score can raise the price of the whole loan. Here is the trade-off.

Picture a couple where one partner earns most of the income and has a strong score. The other has a low score and a car payment. Applying together adds income but pulls the loan’s score down to the weaker number. Applying alone may price better, but the loan must fit on one income. Applying together may be the only way to qualify, but at a higher cost.

There is no universal answer. A lender can run both versions of the file, one borrower and two, and show you the results side by side. That comparison is worth asking for.

A non-occupant co-borrower is someone who helps you qualify but will not live in the home. That person’s score enters the same selection, because they are a borrower on the loan. Program limits on non-occupant co-borrowers vary, so check them before you plan around one.

What Does Your Score Change Besides Approval?

Your score affects three things beyond a yes or no.

Pricing. The representative score feeds the lender’s price adjustments. Lower scores generally cost more, and higher scores cost less. The size of the effect depends on your leverage too, so the same score can price differently at 95% leverage than at a lower one. Specific figures change and depend on the full file, so they are not quoted here.

Mortgage insurance. Mortgage insurance is required above 80% leverage. Your credit score is one input to its cost. Published typical annual premiums run from 0.58% to 1.86% of the loan balance, which is a range and never a quote. The insurance can be cancelled at your request once you reach 80% of the original home value, with good payment history, no second liens and no drop in value. The lender must end it automatically at 78%.

Documentation. A stronger file can mean fewer questions. Whether a lender asks you to explain derogatory credit depends on the underwriting findings and lender guidelines.

If you are curious how the credit pull itself affects your score, Lendmire’s piece Will a Conventional Cash-Out Refinance Hurt Your Credit Score? covers inquiries and timing in more detail.

What If the Lower Score Falls Short?

You have two moves: raise the lower score or change the structure.

Start with the report. Errors on a credit report can drag a score down, and a corrected report can change the score used. Dispute errors with the bureau early.

Then work the factors that tend to move a score. Pay down credit card balances, because high balances relative to limits weigh on scores. Pay every bill on time. Avoid opening new accounts before you apply. Closing old accounts can also hurt, so leave them alone unless there is a reason.

On structure, ask about these options:

1. Applying with one borrower instead of two, if the income works alone.

2. Waiting to apply until the lower score improves.

3. A larger down payment, since leverage and score work together.

4. Another loan type, such as FHA, which has its own rules.

Timing helps, too. A score that rises before the lender pulls credit helps you. A score that falls after preapproval can change the result, since a lender may pull credit again before closing. Avoid new debt until the loan is done.

Checklist Before You Apply Together

• Pull your own reports from all three bureaus and read them for errors.
• Know each borrower’s likely middle score.
• Ask the lender which scoring model it uses.
• Ask whether the lender has overlays above the agency minimum.
• Ask for the file run both ways, one borrower and two.
• Hold off on new credit, big purchases and closing old accounts.

Key Terms Defined

Representative score: The single score used for a loan’s pricing and delivery. With two or more borrowers, it is the lowest borrower score.

Average median score: The average of each borrower’s median score. It applies to eligibility on manually underwritten loans with more than one borrower.

Tri-merge: A credit report that combines data and scores from all three credit bureaus.

Overlay: A rule a lender adds on top of the agency minimums. It can be stricter than the agencies require.

Automated underwriting: Agency software that evaluates credit, income, assets, debts and leverage together and returns a finding.

Mortgage insurance: Coverage that protects the lender and is required on conventional loans above 80% leverage. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Next Step

If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file. Program figures are subject to lender guidelines and full file review, and nothing here is a commitment to lend.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage broker licensed for consumer lending in 16 states. Lendmire arranges FHA, VA, conventional and jumbo purchase and refinance loans through wholesale lenders; every file is underwritten by the lender under the applicable program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Fannie Mae Selling Guide B3-5.1-02: Determining the Credit Score for a Mortgage Loan

2. Fannie Mae Loan Delivery Job Aid: Credit Scores

3. Fannie Mae Selling Guide Announcement SEL-2025-09

4. Fannie Mae Selling Guide B3-5.1-01: General Requirements for Credit Scores