Quick Answer: Credit and DTI guidelines on conventional loans depend on the underwriting system and loan product. Fannie Mae DU does not require a minimum third-party credit score. Generally, it allows total DTI up to 50%, subject to exceptions. Freddie Mac LPA applies its own assessment, while manual underwriting follows separate score and ratio requirements. Meeting a published limit does not guarantee approval. The lender must verify income, debts, assets, credit history, mortgage insurance eligibility, and the property. This guide explains the rules for conforming conventional mortgages that qualify for Fannie Mae or Freddie Mac. Jumbo and other nonconforming loans have different requirements set by their investors.
Conventional Credit Score and DTI Requirements by Underwriting Path
Fannie Mae’s Desktop Underwriter, or DU, and Freddie Mac’s Loan Product Advisor, or LPA, are separate automated underwriting systems. Their findings and requirements are not interchangeable.
| Underwriting path | Credit-score treatment | Total DTI requirements |
|---|---|---|
| Fannie Mae DU | No minimum third-party credit score required by DU | Generally up to 50%; transaction-specific exceptions apply |
| Fannie Mae manual underwriting | Baseline minimums of 620 for fixed-rate loans and 640 for ARMs; the Eligibility Matrix and applicable exceptions govern | Generally 36%, potentially up to 45% when required credit-score and reserve criteria are met |
| Freddie Mac LPA Accept | No minimum Indicator Score required for Accept mortgages under Guide Section 5203.2 | LPA assesses the submitted ratios; follow the Feedback Certificate and applicable Guide requirements |
| Freddie Mac manual underwriting | Product-specific Indicator Score requirements; consult the Guide and applicable eligibility matrix | 36% guideline; above 36% requires documented justification, with a 45% maximum under the standard rule |
These are standard summaries. Some products and transactions have additional restrictions, and not every application is eligible for manual underwriting.
What DU’s Minimum-Score Change Means
Effective 15th November 2025, Fannie Mae has removed the minimum third-party credit score requirement for DU. DU will still assess the underlying credit report information via its own risk analysis. That change does nothing to remove the credit review or to make every application with a low score eligible. The score will still affect the loan’s pricing, and the mortgage will still have to meet the lender’s and mortgage insurance’s requirements. A lender’s stated minimum should therefore be clearly differentiated from DU’s own eligibility criteria.
Why Manual Underwriting Requires a Separate Eligibility Check
A manual underwriter cannot simply substitute personal judgment for a published ratio cap or credit requirement. The lender must confirm that the transaction qualifies for manual underwriting and meets the relevant matrix. For example, Freddie Mac’s Exhibit 25 distinguishes manual score requirements by transaction and financing level. It also identifies second homes and investment properties as requiring an LPA Accept result rather than manual underwriting. A rule for one-unit primary-residence financing should not be applied to every conventional property or loan purpose.
What Counts in a Conventional Loan’s DTI?
Total DTI compares qualifying monthly obligations with the stable monthly income the lender can use: (Qualifying monthly housing payment + Other counted monthly debts) ÷ Qualifying monthly income × 100 = Total DTI
Your housing payment covers more than just principal and interest. Property taxes, homeowners and flood insurance, monthly mortgage insurance, association dues, and any secondary financing can also impact your ability to qualify.
You may also have other obligations, such as credit card payments, installment or student loans, support payments, or costs associated with other properties. The lender will decide which payments to include and if any can be excluded. For the broader relationship between credit, loan costs, and the DTI calculation, read how credit scores impact DTI and mortgage approval.
Do Conventional Loans Have a Front-End Ratio?
The housing-only ratio can be important. It’s wrong to say that conventional underwriting will always ignore it or apply a blanket 31% housing-only limit. For instance, Freddie Mac’s manual underwriting guidance is based on a 28% housing ratio, with documented offsets being required to qualify for an exception. Automated underwriting considers housing expenses as part of the full application. The applicable underwriting path will dictate how the ratio is assessed.
What Can Support a Higher-DTI Conventional Application?
A ratio within the program’s maximum still needs an acceptable overall application. Factors that can help the risk assessment include:
- An established record of on-time payments.
- Manageable revolving credit use.
- Eligible reserves remaining after closing.
- A lower loan-to-value ratio.
- Stable, properly documented qualifying income.
Fannie Mae’s DU risk guidance explains that a higher DTI has a greater adverse effect when combined with other risk factors. These strengths do not create a universal point system or permit every borrower to reach the maximum. Manual underwriting also has specific requirements for supporting higher ratios; FHA’s compensating-factor matrix should not be substituted for conventional rules.
Illustrative Example: The Same Application Under Different Rules
Assume a borrower purchasing a one-unit primary residence has:
- $8,000 in qualifying monthly income.
- A $2,600 qualifying housing payment, including applicable mortgage insurance and other housing expenses.
- $1,200 in other qualifying monthly debt payments.
The total DTI is 47.5%: $3,800 divided by $8,000. That ratio is within DU’s general 50% maximum, but it exceeds Fannie Mae’s standard 45% manual underwriting maximum. Being within DU’s ceiling does not establish an Approve/Eligible result; the rest of the application still requires assessment. If a documented, eligible debt payoff allows the lender to exclude a $300 monthly payment, total DTI becomes 43.75%: $3,500 divided by $8,000. That may bring the ratio within Fannie Mae’s manual DTI limit if the transaction is eligible for manual underwriting. Because the ratio remains above 36%, the applicable credit-score and reserve requirements must still be met. This is an illustrative calculation, not a loan approval. Before making the payoff, the borrower should compare the benefit with the reduction in available closing funds and reserves.
How Credit Disputes and Derogatory Accounts Affect Conventional Approval
DU Does Not Automatically Require Every Dispute to Be Removed
Under Fannie Mae’s disputed-tradeline guidance, DU first assesses the application using the disputed accounts.
- If DU approves with those accounts included, the dispute alone does not require further action under that guidance.
- If approval depends on excluding disputed accounts, the lender must investigate account responsibility and the accuracy or completeness of the information.
- If the borrower owes the debt, its payment must be treated in accordance with the applicable DTI requirements. A dispute does not make the obligation disappear.
Accurate adverse information cannot simply be disregarded to preserve that DU recommendation. The lender must follow the required resolution and underwriting process. LPA files follow Freddie Mac’s credit requirements and feedback; DU’s disputed-account procedure should not be assumed to apply to them.
Collections and Major Credit Events Need Their Own Review
For DU loans secured by a one-unit primary residence, collections and non-mortgage charge-offs generally do not require payoff. Rules differ for other property types and manual underwriting; judgments and liens require separate attention. Follow the actual agency requirements and findings. Bankruptcy, foreclosure, and similar events can also create separate eligibility restrictions. A higher score or acceptable DTI does not erase an unexpired waiting period. The lender must review the event and the relevant dates under the applicable agency rules, including Fannie Mae’s significant credit event requirements.
Mortgage Insurance, Pricing, and Lender Overlays
Credit eligibility, loan pricing, and mortgage insurance are related but separate parts of the qualification process.
On conventional loans with less than 20% down, private mortgage insurance is commonly required. When paid monthly, it adds to the qualifying housing expense. Obtain an actual payment estimate rather than calculating DTI from principal and interest alone.
An acceptable automated recommendation also does not waive applicable insurance coverage or insurer eligibility requirements. Likewise, a lender may impose additional requirements, known as overlays, such as a higher minimum score or lower maximum DTI. Ask whether an obstacle comes from the agency, the automated findings, mortgage insurance, or lender policy. A different lender may have different options, but it must still satisfy the requirements applicable to the loan.
What to Do if Your Conventional Application Does Not Qualify
Begin by finding out the exact reason. Check which agency and underwriting system were involved, whether the information provided was correct, and what requirement still needs to be met. It helps to review whether a lower housing payment, paying off a debt, more eligible income, or a different conventional product would make a difference. If you switch lenders without knowing the problem, you might get the same outcome. Also, if you take on new debts or your income drops before closing, you may need new calculations and another underwriting review. If conventional financing does not fit, another program may be worth considering. Our guide to FHA guidelines on credit scores versus DTI explains FHA’s separate financing thresholds and underwriting rules.
Frequently Asked Questions About Credit and DTI Guidelines on Conventional Loans
Can I Get a Conventional Loan Without a Credit Score?
Potentially. No-score applications have their own documentation and eligibility requirements; they are different from applications with low reported scores. For example, Fannie Mae’s nontraditional-credit rules impose separate restrictions on manual underwriting. Do not assume the general DTI ceiling applies unchanged.
How Are Co-Borrowers’ Scores Used?
The answer depends on the agency and the purpose of the score. Fannie Mae distinguishes the representative score used for pricing from the average median score used for certain manual eligibility decisions. Adding a co-borrower can affect income, debt, and pricing.
Do Conventional Loans Always Require a 20% Down Payment?
No. Certain programs permit substantially less, including 3% down for eligible transactions. Freddie Mac’s Home Possible program is one example. Property, income, education, underwriting, and other program requirements can apply. A 3% option should not be assumed available for every property or borrower.
Must I Close a Credit Card to Qualify if I Pay It Off?
Under Fannie Mae’s revolving-debt payoff rules, an account does not need to be closed solely to exclude its payment after a qualifying payoff. The lender must document the payoff and complete the required analysis. Coordinate the transaction before moving funds or closing accounts.
Does DTI Include Debts That Are Missing From My Credit Report?
It can. Qualification is based on the obligations the lender must count, not only the accounts appearing on a credit report. Disclose private loans, support obligations, and other liabilities on the application so the lender can determine how to treat them under the relevant agency’s rules.
Final Thoughts on Credit and DTI Guidelines on Conventional Loans
The conventional loan credit and DTI guidelines across DU, LPA, and manual underwriting differ. You can’t have a single credit score floor or DTI % that will cover every eligible transaction. It will be determined by the agency, underwriting path, property, loan purpose, and verified financials. Before you change your debt, your down payment, or your borrowers, ask for a calculation that sets out the full qualifying housing payment, the total DTI, the required reserves, and all the other conditions. Compare any proposed adjustment against your funds required for closing and against a household budget that allows for maintenance, savings, and unforeseen expenses.
This article about “Credit and DTI Guidelines on Conventional Loans” was updated on October 29th, 2026.
