The credit score that most Arizona buyers were told was a wall turns out to have been a door all along. Fannie Mae's Selling Guide requires no minimum credit score at all for loan casefiles underwritten through Desktop Underwriter (DU) — its automated underwriting system — while manual underwriting still sets 620 for fixed-rate loans and 640 for adjustable-rate mortgages (Fannie Mae Selling Guide B3-5.1-01). That distinction has existed quietly in the guide for years, but it matters more right now than it has in a decade: buyers across Phoenix and Scottsdale who were declined on a score in 2024 or 2025 may be approvable today without waiting for a credit repair plan to finish.
I have written mortgages in Scottsdale for 15 years, and the most common call I get starts with a number. My score is 598. Somebody at a bank told them that was the end of the conversation, so they stopped looking at conventional loans and assumed FHA was the only door left open.
The two systems are not the same. DU does not treat a credit score as a pass-fail threshold; it analyzes the credit report data itself and weighs it against everything else in the file. Manual underwriting is a different process with a published floor, and knowing which path your file is on determines whether a 590 is disqualifying or simply expensive.
What Does "Subject to AUS Approval" Actually Mean?
It means a computer, not a loan officer's checklist, decides whether your credit profile is acceptable — and DU is explicitly designed not to rely on a score threshold. Fannie Mae's own guidance states that credit scores are not an integral part of DU's risk assessment because DU performs its own analysis of the credit report data (Fannie Mae Selling Guide B3-5.1-01). Your payment history, utilization, inquiries, and account depth get read directly.
Practically, DU returns findings such as Approve/Eligible, Refer/Eligible, or a denial. Refer/Eligible is not a rejection. It means DU wants a human underwriter to review the file — and that underwriter applies the guide's manual requirements, which do carry score floors. This is where files quietly die: a buyer at 590 gets a Refer, the loan officer treats it as a no, and the family is told to come back in a year.
The mechanics reward preparation. DU weighs documented reserves, verified income, and a low debt-to-income ratio against weak credit history, so two borrowers with identical 595 scores can get different answers: one arrives with substantial verified reserves and a modest debt load, the other with nothing in savings and obligations eating most of their income. Fannie Mae also permits VantageScore 4.0 alongside classic FICO for DU files, with one model required for every borrower (Fannie Mae). The two models score the same history differently, so a 610 on one can read above or below 620 on another — worth asking before you accept a decline.
Is Conventional Actually Better Than FHA Below 620?
Not always, but more often than buyers expect — and the deciding factor is usually mortgage insurance, not the rate. FHA charges a 1.75% upfront premium plus an annual premium of 0.55% on most 30-year loans with minimum down, and with less than 10% down that annual premium lasts the life of the loan. The only exit is refinancing or selling.
How they compare | Conventional with low credit | FHA with 580–619 credit |
|---|---|---|
What mortgage insurance costs | Loan-level price adjustments are assessed on the representative credit score, so a lower score raises cost (Fannie Mae) | Upfront 1.75% of the base loan plus annual premium ranging 0.15% to 0.75%, with 0.55% typical at minimum down (Rocket Mortgage) |
How the insurance ends | Private mortgage insurance can be cancelled at 20% equity and is cancelled automatically at 22% (Rocket Mortgage) | Under 10% down, annual MIP runs for the full loan term; 10% or more down limits it to 11 years (Rocket Mortgage) |
Who prices the insurance | The lender's pricing grid and the private insurer, so shopping matters | HUD sets the rate, identical at every FHA-approved lender |
On a $400,000 base loan, the typical 0.55% annual premium works out to roughly $183 a month of MIP, plus $7,000 of upfront premium financed into the balance (Valley West Mortgage). That monthly figure never drops because your credit improves — it only drops when you refinance out.
Conventional pricing moves the other direction. A sub-620 score raises your loan-level price adjustment, which shows up as a higher rate or higher closing costs, but conventional mortgage insurance is cancellable by equity. If Scottsdale values hold and you pay down normally, you reach the 20% threshold and that line disappears. With FHA at minimum down, it never does.
Property standards cut both ways. FHA appraisals carry condition requirements that can flag peeling paint, missing handrails, or roof wear — real obstacles in older Phoenix and central Scottsdale housing stock. Conventional appraisals focus on value and marketability, so a home that fails an FHA appraisal can still close conventional.
Which Compensating Factors Actually Move a Sub-620 File?
Reserves and debt-to-income do more work than anything else in the file, because they are the numbers DU can verify quickly and weigh objectively. A buyer at 595 with documented reserves and a modest debt load is a fundamentally different risk than one with nothing in savings. Fannie Mae describes DU as performing a risk assessment and applying the guide's credit policies to establish eligibility, rather than screening on a single score (Fannie Mae).
Documented reserves are liquid or near-liquid assets left after closing. This is the most overlooked lever, because most buyers assume the money only matters for the down payment. It matters just as much as proof that a surprise expense will not become a missed payment.
Debt-to-income ratio is total monthly obligations divided by gross monthly income. Paying off a car loan or a store card can cut the ratio faster than years of credit repair, and unlike a credit score it can change in an afternoon. At Empire Home Loans, the DTI conversation usually produces more movement than the score conversation.
Verified, stable income carries weight buyers underestimate. Fannie Mae's validation service pulls third-party reports to confirm income, employment, and assets digitally, cutting the paper chase without changing the underlying requirement: the income must be documented and likely to continue (Fannie Mae).
Payment history on housing is read closely, since it predicts the behavior that matters most. A borrower at 590 with 24 months of on-time rent is a stronger file than one at 610 with a recent late payment.
What does not help: paying down collections the week before closing without guidance, opening new credit to "build the score," or moving money between accounts. Each creates questions an underwriter has to resolve, and some delay a closing past a purchase contract's deadline.
Ask for a full DU run, not a score quote. A loan officer who responds to your credit score with a yes or no has not actually checked the automated system. The answer lives in the findings, and the findings are free to obtain.
Why Does the Arizona Market Make This Matter More?
Because Phoenix-area sellers are still cutting prices to close deals, which means buyers have room to negotiate rather than being forced into a rushed purchase. In May, 75% of homes that closed did so after a median price reduction of $25,000 from the original list price, compared with a typical May reduction of about $16,000 over the past 11 years, according to the Arizona Regional Multiple Listing Service (ARMLS June 2026 STAT Report).
That statistic changes the arithmetic for a sub-620 buyer. A reduction of that size moves real money toward closing costs and reserves. New home sales in Maricopa County declined 14% year over year in May, extending a streak of declines to 16 months, and the median price gap between new construction and resale narrowed to just 7% versus a historical May average near 30% (ARMLS). Builders competing harder against resale sellers is good news for anyone holding a pre-approval.
Scottsdale adds a wrinkle: its housing stock runs from mid-century ranches to recent builds, and the older end is where FHA appraisal condition requirements cause trouble.
Sequencing matters more than program choice. Get DU findings before you shop, not after you fall in love with a house. A pre-approval built on a real automated underwriting run carries more weight with a listing agent than a verbal estimate.
What Should You Do Differently Starting Today?
Stop treating a credit score as a verdict and start treating it as a pricing input. The question worth asking is not whether you qualify but what your file needs to produce an Approve/Eligible finding — and that answer comes from a real DU submission, not from a number on a credit app (Fannie Mae).
Bring three things to that conversation: two years of documented income, statements for every account you will use for down payment and reserves, and a list of every monthly obligation — including the ones that never appear on your credit report.
Refinancing deserves the same fresh look. Homeowners who took an FHA loan at minimum down are paying that annual premium for the life of the loan (Rocket Mortgage). If your credit has since landed below 620, a conventional refinance may still be worth pricing, because moving out of lifetime MIP is a permanent monthly improvement rather than a temporary one.
None of this substitutes for an underwriting decision. But the assumption that a 590 closes the conventional door has cost Arizona families real money — in higher premiums and years spent waiting for a score to move.
You do not need a better score to get a straight answer about what you qualify for today. A 15-minute, no-pressure call with me replaces the guess with findings from the system that actually decides — bring your income documents and we will run it.
Find out what your file qualifies for — not what your score suggests
Book a no-pressure call with Virginia Fargo, independent mortgage broker in Scottsdale. Bring your income documents and we will run the file through Desktop Underwriter and review the findings together.
Schedule Your No-Pressure CallAll financing is subject to credit, income, property, automated underwriting approval, and applicable program requirements. Program availability varies by lender.
Virginia Fargo, providing No Hassle Home Loans, the trusted mortgage consultant, home loan advisor in Scottsdale & Across Maricopa County, the leading mortgage broker dedicated to helping consumers save money specializing in home loans, first-time homebuyers, relocation, affordability and self-employed borrower financing.
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1What happens if my credit report shows no score at all?
It is possible to be approved through DU without a credit score at all in some circumstances, since Fannie Mae's guide carves out transactions where no borrower has a traditional score and points to its nontraditional credit history requirements instead. In those cases the lender documents rent, utility, and insurance payment history. The file is underwritten manually or through DU with that alternative history, and the terms reflect the added risk.
2Can a different credit scoring model change my result?
It affects which credit model produces your number. Fannie Mae permits both classic FICO and VantageScore 4.0 for DU-underwritten loans, but the same model must be used for every borrower on the file. The two models weigh the same underlying data differently, so a score that reads 612 under one can read below 620 under another. Before you accept a decline, ask which model was pulled.
3Should I pay off debt or move money before applying?
Yes, but the timing matters more than the amount. Large deposits, newly opened accounts, and paid-off collections all create documentation requirements that an underwriter has to clear, and clearing them takes days you may not have inside a contract period. Make the moves with your loan officer's guidance and before you are under contract, not during the appraisal window.
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