Part of the Mortgage Readiness guide.
Two real changes have reshaped conventional mortgage underwriting recently, and both are worth understanding if you are getting ready to apply. Neither eliminates the need for good credit — but both open the door wider than the old rules did.
Change 1: Fannie Mae Removed the Rigid 620 Minimum
Fannie Mae eliminated its strict 620 minimum credit score requirement for conventional loans, moving toward automated underwriting that evaluates the full loan file rather than applying one universal cutoff to every borrower. In practice, this means a strong file with compensating factors — solid income, low debt-to-income ratio, healthy reserves — can be evaluated more holistically instead of being screened out purely on a sub-620 score.
This does not mean 620 no longer matters. Most individual lenders still reference 620 as a practical baseline, and many mortgage insurers and investors continue to apply their own floors. The change is in how automated underwriting weighs the full file, not a blanket removal of credit standards.
Change 2: VantageScore 4.0 Is Now Accepted
Lenders can now choose between VantageScore 4.0 and classic FICO scores for loans sold to Fannie Mae and Freddie Mac. This matters because VantageScore 4.0 incorporates alternative data sources — including rent payments, utility bills, and telecom payments — that classic FICO mortgage models do not consider. For borrowers with a thin credit file who nonetheless have a strong record of paying rent and bills on time, this can mean qualifying where the older FICO-only approach would not have shown enough history to produce a usable score.
What Has Not Changed
- FHA, VA, and USDA program minimums are unchanged by these conventional-loan updates — those programs have their own separate rules.
- Lender overlays still apply. An individual lender can still require a higher score than the new, more flexible baseline.
- The tri-merge, middle-score method is unchanged. These updates affect which score model can be used, not the mechanic of pulling three bureaus and using the middle result.
- Income, debt-to-income ratio, and reserves still matter just as much. A more flexible score policy does not remove the rest of underwriting.
What This Means If You Are Applying Now
If your credit file is thin rather than damaged — limited history rather than negative marks — ask a loan officer directly whether they are evaluating your file under the newer automated underwriting flexibility or whether they can consider VantageScore 4.0 with alternative data. Not every lender has adopted these options at the same pace, so the practical effect still depends heavily on which lender you work with.
Have negative items rather than a thin file? These rule changes help borrowers with limited credit history more than borrowers with active derogatory marks. See the Credit Dispute Guide and How to Improve Your Credit Before Applying for the more direct path in that case.