Conventional Loans: Requirements and Guidelines
Conventional loans are mortgage products not insured or guaranteed by a federal government agency, distinguishing them from FHA, VA, and USDA programs. They represent the largest segment of the U.S. residential mortgage market and are governed primarily by the underwriting guidelines published by Fannie Mae and Freddie Mac. Understanding the eligibility requirements, loan structure options, and applicable limits is essential for borrowers and housing professionals navigating the purchase or refinance of residential property.
Definition and scope
A conventional loan is any residential mortgage that does not carry a government guarantee from the Federal Housing Administration, Department of Veterans Affairs, or U.S. Department of Agriculture. Instead, lenders bear the credit risk directly — or transfer it to private investors through the secondary mortgage market — with private mortgage insurance substituting for the government-backed protection used in agency programs.
Conventional loans divide into two structural categories:
- Conforming loans: Loans that meet the size and underwriting standards set by the Federal Housing Finance Agency (FHFA) and are eligible for purchase by Fannie Mae and Freddie Mac. The FHFA sets annual conforming loan limits; for 2024, the baseline limit is $766,550 for a single-unit property in most U.S. counties (FHFA Conforming Loan Limits).
- Non-conforming loans: Loans that exceed conforming limits (commonly called jumbo loans) or fail to meet Fannie Mae/Freddie Mac guidelines for other underwriting reasons. These remain on the lender's portfolio or are sold to private investors at non-agency pricing.
Conforming conventional loans are underwritten to either Fannie Mae's Selling Guide or Freddie Mac's Single-Family Seller/Servicer Guide — both publicly available from their respective agencies. The Consumer Financial Protection Bureau's Qualified Mortgage rule also shapes conventional loan structuring by establishing safe-harbor standards for ability-to-repay compliance.
How it works
The conventional loan process follows a structured sequence of eligibility evaluation, documentation, and closing.
- Pre-qualification and pre-approval: Borrowers provide income, asset, and credit data for an initial assessment. Formal mortgage pre-approval requires verified documentation and a hard credit inquiry.
- 19](https://www.ecfr.gov/current/title-12/chapter-X/part-1026/section-1026.19)).
- Underwriting: The loan file is evaluated against Fannie Mae or Freddie Mac guidelines covering credit, income, assets, and collateral. Automated underwriting systems — Desktop Underwriter (Fannie Mae) or Loan Product Advisor (Freddie Mac) — generate risk classifications. Manual underwriting is available for files that receive a "Refer" finding. See mortgage underwriting for a full process breakdown.
- Appraisal and title: An independent appraisal establishes the property's market value, directly affecting the loan-to-value ratio calculation. Title search confirms clear ownership.
- Closing: Final terms are disclosed in the Closing Disclosure at least 3 business days before consummation (12 CFR § 1026.38). Funds are disbursed and the lien is recorded.
Core eligibility thresholds for conforming conventional loans (per Fannie Mae Selling Guide B3 series):
| Factor | Standard Minimum |
|---|---|
| Credit score | 620 (most loan types) |
| Maximum DTI ratio | 45% (up to 50% with compensating factors) |
| Minimum down payment | 3% (standard programs); 5% (most purchase transactions) |
| LTV ceiling without PMI | 80% |
Private mortgage insurance is required when the loan-to-value ratio exceeds 80% (Homeowners Protection Act, 12 U.S.C. § 4901 et seq.). PMI cancels automatically when the LTV reaches 78% based on the original amortization schedule, or upon borrower request at 80% LTV if certain conditions are met.
Common scenarios
First-time buyers with limited down payment: Fannie Mae's HomeReady and Freddie Mac's Home Possible programs allow down payments as low as 3% for qualifying income levels, with mandatory homeownership education. These are distinct from FHA programs, which carry upfront and annual mortgage insurance regardless of LTV — a contrast explored further at FHA loans.
Move-up buyers with existing equity: Borrowers selling a prior home and applying equity toward the new purchase often exceed the 20% threshold, eliminating private mortgage insurance entirely and reducing the effective cost of borrowing compared to any government-insured product.
Investment property financing: Fannie Mae and Freddie Mac permit conventional financing on 1-4 unit investment properties, though minimum down payment requirements increase — typically 15% for a single-unit investment property — and interest rate adjustments apply through loan-level price adjustments (LLPAs).
High-cost markets: In counties designated as high-cost by the FHFA, conforming loan limits may reach $1,149,825 for a single-unit property in 2024 (FHFA), allowing conventional conforming terms where standard limits would otherwise require jumbo pricing.
Refinance transactions: Conventional refinancing covers rate-and-term and cash-out structures. Cash-out refinance transactions carry tighter LTV ceilings — typically 80% for primary residences — than rate-and-term refinances under Fannie Mae guidelines.
Decision boundaries
Choosing a conventional loan over a government-insured alternative depends on overlapping eligibility, cost, and structural factors.
Conventional vs. FHA: FHA loans accept credit scores as low as 500 (with 10% down) compared to the conventional floor of 620. However, FHA mortgage insurance premium structures differ materially — upfront MIP of 1.75% of the base loan amount plus annual premiums persist for the loan's life if the original LTV exceeds 90% (HUD Mortgagee Letter 2023-05). Borrowers with credit scores above 740 and sufficient down payment funds generally find conventional pricing more favorable.
Conventional vs. VA: Eligible veterans and active-duty service members using VA loans pay no down payment and no monthly mortgage insurance, making VA a dominant choice when eligibility exists. Conventional loans serve borrowers without VA entitlement or those who have exhausted it.
Conforming vs. jumbo: Once a loan exceeds the applicable conforming limit, lender guidelines and pricing shift materially. Jumbo underwriting typically requires stronger debt-to-income ratios, larger cash reserves (often 12 months of mortgage payments), and higher credit scores than conforming programs demand.
Fixed vs. adjustable rate: Conventional loans are available in both fixed-rate and adjustable-rate structures. Fixed-rate mortgages carry consistent payments over 10, 15, 20, or 30-year terms. Adjustable-rate mortgages offer initial fixed periods (commonly 5, 7, or 10 years) before rate adjustment, governed by caps outlined in Fannie Mae guidelines and CFPB ARM disclosure rules.
Qualified Mortgage compliance: Most conventional conforming loans are structured to meet the Qualified Mortgage rule safe harbor, which limits points and fees to 3% of the loan amount and restricts risky loan features. Loans outside QM parameters may still be originated but face greater legal exposure under the ability-to-repay rule.
References
- Federal Housing Finance Agency (FHFA) — Conforming Loan Limits
- Fannie Mae Selling Guide
- Freddie Mac Single-Family Seller/Servicer Guide
- Consumer Financial Protection Bureau — Regulation Z (12 CFR Part 1026)
- CFPB — Qualified Mortgage Rule
- Homeowners Protection Act (12 U.S.C. § 4901)
- [HUD Mortgagee Letter 2023-05 (FHA MIP)](https://www.