Denise had a 604 FICO score, two collection accounts from a hospital bill she assumed was covered, and a signed contract on a $285,000 townhouse. Her first loan officer told her conventional financing was off the table. She closed 41 days later at 6.875% with 5% down. The difference between those two outcomes wasn’t luck. It was information.
A conventional loan for bad credit is not a fairy tale, but it isn’t a free pass either. Fannie Mae and Freddie Mac draw a hard line, and the pricing above that line punishes low scores in ways most borrowers don’t see until the Loan Estimate arrives. Here’s the honest version of how it works.
What Underwriters See When They Pull Your File
Your credit report tells three separate stories, and lenders weigh them differently.
The score is the headline number, but it’s a snapshot. Underwriters look at the middle score of three bureaus for each borrower, then use the lowest of those middle scores across all borrowers on the application.
The tradelines matter for depth. A single $500 secured card with eight months of history is a thin file, even at a 700 score. Three open accounts reporting on time for two years reads as a real credit history.
Derogatory events carry fixed waiting periods, and these are not negotiable at the lender level:
- Chapter 7 bankruptcy: four years from discharge
- Chapter 13 bankruptcy: two years from discharge, or four years from dismissal
- Foreclosure: seven years
- Short sale or deed-in-lieu: four years
- Collections and charge-offs: no fixed waiting period, but they must usually be resolved or explained
Recent late payments are the ones that sting. A 30-day late from 2019 barely registers. Two 30-day lates in the past twelve months will drag an approval into manual review or kill it outright.
The 620 Line, and What It Costs to Sit Just Above It
Most conventional lenders set 620 as the floor. A handful overlay it higher, at 640 or 660, which is why two lenders can give you completely different answers on the same day. Below 620, the automated systems won’t issue an approve/eligible finding, and you’re either looking at government-backed financing or a portfolio lender with its own rules.
Landing at 622 is approval. It is also the most expensive pricing bucket in the conventional grid.
The price you pay for a low score
Loan-level price adjustments are add-ons to the base rate, expressed as a percentage of the loan amount. A borrower at 620–639 putting 5% down on a $340,000 loan can expect an adjustment somewhere in the neighborhood of 2.5% to 3% of that loan. That’s roughly $8,500 to $10,200, paid either as discount points at closing or baked into a higher interest rate for thirty years.
Run the same loan at a 760 score and the adjustment is close to zero. Same house, same down payment, same income. The gap between those two borrowers is often $130 to $180 a month, every month, for the life of the loan.
Manual underwriting still exists
When the automated system refers a file rather than approving it, a human underwriter can look at compensating factors: six months of reserves, a 32% debt-to-income ratio, eight years at the same employer, or a documented rental history with twelve months of cancelled checks. That last one is how thin-file borrowers with no credit cards sometimes get through. Ask specifically whether the lender permits non-traditional credit references. Many do, and almost none advertise it.
Where Damaged Files Actually Get Approved
The borrowers who successfully land a conventional mortgage with bad credit tend to share one of these profiles.
They put more money down. A 20% down payment does two things at once: it wipes out mortgage insurance and it drops you into a lower pricing tier on the adjustment grid. On a 620 score, moving from 5% down to 20% down can cut the add-on by more than half.
They wait out the calendar. If you’re eleven months from the four-year mark after a Chapter 7 discharge, waiting can be worth more than any negotiation. Time converts an ineligible file into a priced file.
They bring in a co-borrower for income, not for score. This trips people up constantly. Because conventional guidelines use the lowest median score on the application, adding a spouse with a 790 score won’t fix your pricing if your score is 604. Their income can rescue your debt-to-income ratio, and that can be the thing standing between you and a denial.
Fastest Ways to Move the Score Before You Apply
Score repairs are not instant, but a handful of moves produce results inside a single billing cycle.
- Pay revolving balances down hard. Utilization is recalculated when the statement cuts. Dropping a card from 62% to 12% utilization routinely moves a score 30 to 50 points.
- Leave old accounts open. Closing a paid-off card shrinks your available credit and raises utilization everywhere else.
- Dispute genuine errors. A rapid rescore, done through your lender with documentation, can update a bureau file in three to five business days instead of thirty.
- Freeze new applications. Every hard inquiry in the six months before applying costs you a few points. Rate shopping for a car in March is a bad idea if you’re buying a house in June.
- Ask for a goodwill adjustment. A single isolated 30-day late on an otherwise clean account is sometimes removable with a written request to the creditor. It works maybe one time in four, and it costs nothing to ask.
- Talk to your lender before paying old collections. Paying a five-year-old collection can refresh the date of last activity and drop your score. If the underwriter will accept a letter of explanation instead, take that route.
Down Payment and Purchase Price Are Your Two Levers
Once your score is locked in, the remaining variables are how much you put down and how much house you buy. Both interact with credit risk in ways that surprise people.
If this is your first purchase, the guidelines first-time buyers are actually held to are worth reading before you tour a single property, because the 3%-down conventional programs carry their own score minimums and occupancy rules. And check the conforming loan limits for 2027 before you fall in love with a listing. Going one dollar over the county limit pushes you into jumbo territory, where credit standards tighten sharply and a 604 score becomes a much harder sell.
Debt-to-Income: The Other Half of the Decision
A weak score can be offset. A blown debt-to-income ratio usually can’t.
Conventional automated approvals generally cap total DTI at 45%, stretching to 50% when reserves and credit are strong. A borrower at 604 with a 38% DTI and four months of reserves is a far better bet than a 680 borrower at 49% with nothing in the bank. The debt-to-income ratio calculation includes your proposed payment, taxes, insurance, HOA dues, minimum card payments, and any student loan payment at 1% of the balance if the reported payment is zero. Paying off a $400 car loan can be worth more than three months of credit repair.
The Costs That Don’t Show Up in the Rate
Two line items catch low-score borrowers off guard.
Mortgage insurance is priced off your score and down payment. At a 760 score with 5% down, private mortgage insurance might run around 0.5% of the loan annually. At 620, that same coverage can land near 1.1%. On a $300,000 loan that’s $3,300 a year instead of $1,500, and it stays until you reach 20% equity. There are legitimate ways to remove PMI early, including a new appraisal once values rise, and it’s worth planning for from day one.
Closing costs also creep upward, because discount points are often the cleanest way to buy down a rate inflated by credit adjustments. Budget 3% to 5% of the purchase price, and read the line-by-line breakdown of conventional closing costs so you know which fees are negotiable and which are fixed.
A Realistic Eight-Week Timeline
Week one: pull your full tri-merge report from all three bureaus and dispute anything inaccurate. Week two: pay every revolving balance down below 10% utilization and leave the accounts open. Week three: gather two years of tax returns, your last two pay stubs, and two months of bank statements, then hand them to a lender for a soft pre-qualification so you know your true DTI before anyone pulls credit.
Week four: request a rapid rescore with your lender’s credit vendor and get written documentation of any paid collections or updated balances. Week five: have two more lenders price the exact same scenario, and compare the loan-level adjustment on page two of the Loan Estimate rather than the headline rate. Week six: if a derogatory event is within ninety days of its waiting period expiring, wait. Week seven: lock once you have a fully underwritten approval, not a pre-qualification. Week eight: close.
If the numbers say you need nine months rather than eight weeks, take the nine months. The borrower at 604 who waits and pays down two cards to reach 660 will pay tens of thousands less over thirty years than the one who forces a deal through at the worst pricing bucket. Bad credit is a temporary condition. A bad mortgage rate is a long one.