Two buyers apply for the same $320,000 conventional loan on the same afternoon. One has a 748 credit score, the other a 641. Same house, same down payment, same loan officer. The second buyer ends up paying roughly $180 more every month and about $3,000 more in upfront loan fees. Nothing about the property changed. Only the score did.
That gap is why the conventional loan credit score question deserves more than a single number thrown at you. Yes, there’s a floor. But the floor and the sweet spot are two very different places, and knowing where you sit between them tells you a lot about whether to apply now or spend a few months fixing things first.
620 Is the Entry Point, Not the Target
Almost every lender that sells loans to Fannie Mae or Freddie Mac sets 620 as the minimum qualifying credit score. That’s the agency floor, and it has held steady for years. Plenty of banks and credit unions layer their own minimums on top, so you’ll run into 640 and even 660 at some institutions, especially for jumbo-sized conventional loans or certain low down payment programs.
One detail trips up a lot of couples: when two people apply together, lenders generally use the lower of the two middle scores. A 790 spouse does not rescue a 605 partner on a conventional loan. Both borrowers usually need to clear the minimum on their own.
Lenders also pull all three bureaus and use the middle score for each borrower, not the average and not the highest. That’s why paying off a credit card two days before applying sometimes seems to do nothing — the update may have landed on one bureau and not the others yet.
How Your Score Reprices the Entire Loan
Mortgage pricing isn’t one interest rate table. Fannie Mae and Freddie Mac publish grids of loan-level price adjustments, and credit score is one of the biggest dials on that grid. A borrower at 625 pays an upfront fee expressed as a percentage of the loan amount. A borrower at 765 pays a fraction of it, or nothing at all.
Stack that fee on top of the ongoing rate difference and the math gets uncomfortable. Move from the 740+ tier down to the 620–639 tier on a $320,000 loan and you’re looking at roughly 2.5% to 3% of the loan amount in one-time cost, plus somewhere around half a point to a full point on the interest rate. That’s real money before you’ve made a single payment.
Then there’s mortgage insurance, which most buyers forget is also score-sensitive. With 5% down, a borrower at 625 might pay something like 1.2% to 1.5% of the loan balance annually in private mortgage insurance, while a borrower at 760 pays closer to 0.3%. On a $300,000 balance that’s the difference between about $4,000 and $900 a year, and it sticks around until you build enough equity to drop it.
Credit isn’t the only lever on pricing, of course. What actually moves your conventional mortgage quote covers the rest of the picture, from down payment size to rate locks and points.
Where the Tiers Break
- 760 and above: top pricing. Past this point you gain almost nothing, so there’s little reason to keep grinding.
- 740–759: functionally identical to the best tier for most loan products.
- 700–739: minor adjustments, still strong overall pricing.
- 680–699: middle of the road. Mortgage insurance costs start climbing noticeably.
- 660–679: rates and upfront fees deteriorate in a way you’ll feel monthly.
- 640–659: the “just good enough” zone. Underwriters tend to look harder at the whole file.
- 620–639: eligible but expensive. This is the band where waiting two or three months usually pays for itself several times over.
What Happens Below 620
This is where conventional financing typically stops. A 600 score won’t earn an automated approval from Fannie or Freddie, so the lender has no clean way to sell the loan. A small number of portfolio lenders keep mortgages in-house and set their own rules, but pricing is steep and they usually want 20% down or more.
FHA is the realistic comparison, and the tradeoffs aren’t as obvious as they look. FHA accepts scores down to 580 with 3.5% down, and some lenders will go lower with larger down payments. A side-by-side look at FHA versus conventional loans on down payment and credit score is worth doing before you assume either one wins, because FHA charges mortgage insurance premiums for the life of the loan in most cases while conventional PMI eventually drops off.
If you’re weighing FHA seriously, start with the four numbers FHA lenders actually check. Credit score is only one of them, and a strong showing on the others can sometimes offset a weak one.
The Credit Details Beyond the Score
The score determines your pricing tier. It doesn’t approve the loan by itself. Underwriters review the story behind the number, and certain events carry fixed waiting periods:
- Chapter 7 bankruptcy: usually four years from discharge, longer with more than one filing.
- Chapter 13 bankruptcy: typically two years from discharge, or four years from dismissal.
- Foreclosure: generally seven years, reduced to three with documented extenuating circumstances.
- Short sale or deed-in-lieu: commonly four years.
- Recent late payments: a single 30-day late in the past 12 months can sink an otherwise clean file.
Thin credit files matter too. Someone with a 730 score built on two accounts and eight months of history is a very different risk than someone with a 730 built on a decade of on-time payments. The full list of conventional loan requirements lenders check before approving you goes well past credit, into debt-to-income ratios, reserves, and employment history.
Practical Ways to Move the Number Before You Apply
Most score improvements available in under 90 days come from one place: credit utilization. A few moves that consistently work:
- Get every individual card below 10% utilization, not just your overall ratio. Per-card balances count.
- Pay down before the statement closing date, not the due date. The balance reported to the bureaus is the statement balance.
- Leave old accounts open, even the ones you never use. Closing them shortens your history and raises your ratio.
- Ask for credit limit increases on cards you’ve handled well. Many issuers do a soft pull, and a higher limit lowers utilization without you paying a cent.
- Avoid opening new accounts for at least six months before applying. A new inquiry plus a lower average account age is a double hit.
- Dispute genuine reporting errors and ask the lender about a rapid rescore, which can push corrections through in days rather than weeks.
Timelines vary by what’s broken. Utilization fixes show up in one billing cycle. A collection or a late payment takes months to fade. A bankruptcy or foreclosure takes years, and no amount of credit repair changes the calendar.
Deciding Whether to Wait or Apply Now
The useful question isn’t “what’s the minimum score for a conventional loan” but “what does three more months of work actually save me?” If you’re sitting at 638 and paying down two cards will get you to 665, waiting almost always wins — the upfront fee reduction alone often exceeds a couple of months of rent. If you’re at 615 and need 700 to see real improvement, that’s a year or more, and interest rates could move further than you’d save.
Ask a loan officer to price the same scenario twice: once at your current score, and once at the score you could realistically reach in 90 days. Put both numbers on paper. That dollar comparison, not a generic credit tier chart, is the thing that should decide your timing.