A 604 credit score doesn’t lock you out of the mortgage market. It moves you to a different shelf. The same $300,000 house that prices at 6.6% for a buyer with a 760 score can come in near 8.4% for someone sitting at 590. That’s about $370 more every month for identical keys, an identical roof, an identical kitchen.
That gap is real. It is also more negotiable than most people assume. Knowing how lenders actually build the price of a loan, and which levers move it fastest, is worth several thousand dollars over the life of the mortgage.
What Bad Credit Actually Does to Your Rate
Mortgage pricing runs on grids. Fannie Mae and Freddie Mac publish loan-level price adjustments, and most lenders layer their own margin on top of those. Credit score is one of the heaviest inputs on the grid, broken into bands of roughly 20 points each.
A rough map of the 30-year fixed market looks something like this: a borrower at 760 or above might see 6.5%. At 700, maybe 6.75%. At 660, closer to 7%. Between 620 and 659, expect 7.4% to 7.9%. Under 620 on a conventional loan, pricing climbs sharply and a lot of lenders simply decline the file. The distance between a strong score and a weak one is worth more than a full percentage point, which is why a 760+ score buys you a pricing tier most borrowers never see.
Two details trip people up. First, the score a lender uses isn’t the one in your banking app. It’s the middle of your three FICO scores, or the lower of two middle scores for a couple applying together. One spouse with a 580 pulls the whole file down. Second, the score is only one line on the grid. Down payment, reserves, property type, and debt-to-income all shift the price too.
The Cost in Dollars, Not Percentages
Percentages hide the damage. Run the numbers on a $300,000 loan.
- 6.6% (strong credit): $1,916 per month in principal and interest.
- 7.5% (mid-600s): $2,098 per month.
- 8.4% (under 600): $2,286 per month.
From best to worst, that’s $370 a month and roughly $133,000 in extra interest across 30 years. Add mortgage insurance on top if you’re putting down less than 20%, and the spread widens further.
This is the part most articles skip: the rate is only half the story. Closing costs, lender fees, and mortgage insurance premiums all move with credit risk. The full picture of what bad credit borrowers actually pay includes those costs, and they can add another 2% to 4% of the loan amount at closing.
Loan Program Choice Often Beats Score Repair
Waiting a year for your score to climb costs you a year of rent. Switching loan programs can happen in three weeks.
FHA
FHA is the most forgiving door in the market. A 580 score with 3.5% down qualifies, and 500 to 579 works with 10% down. The trade-off is mortgage insurance: 1.75% upfront and an annual premium around 0.55%. On a 30-year loan with less than 10% down, that annual premium typically stays for the life of the loan. FHA rates themselves often price lower than conventional rates for weak-credit borrowers, so the comparison is closer than people expect.
VA
VA has no official credit minimum in its guidelines, but individual lenders set their own floors, usually 620 and sometimes 580 with compensating factors. No monthly mortgage insurance, which makes VA the strongest option for eligible veterans with bruised credit.
Conventional
620 is the practical floor. Above that, price adjustments at the low end of the score range can add the equivalent of 1.25% to 3% of the loan amount in points. A good loan officer will show you the buy-up versus buy-down math side by side.
Non-QM and portfolio loans
Bank statement loans and asset-depletion products can go down to 500 scores, but rates land in the 9% to 11% range. Occasionally useful for self-employed buyers; rarely the cheapest path.
Loan size shifts the pricing grid as well, so a $250,000 loan and a $750,000 loan don’t price the same way even for identical borrowers.
Five Moves That Can Take a Full Point Off
None of these require a year of waiting. Most take between a week and a closing.
- Pay revolving balances below 10% utilization. A card at 85% utilization versus 8% can be worth 40 to 60 points. Ask the lender for a rapid rescore and the new score can land in three to five business days.
- Request a manual underwrite. FHA and VA both allow it. Twelve months of on-time rent, six months of reserves, or a long employment history can offset a weak score, especially at 580 to 619.
- Buy the rate down with seller credits. One discount point costs 1% of the loan and typically cuts the rate by about 0.25%. Ask the seller to cover a 2-1 buydown instead of dropping the price; in a slow market, many will.
- Add a co-borrower carefully. A spouse or parent with a 740 score can help, but lenders use the lower middle score. If the stronger borrower’s income alone qualifies, applying solo can sometimes produce a better price.
- Raise the down payment to 20%. Eliminating mortgage insurance doesn’t change the rate, but it drops the payment more than half a point of rate would.
How to Shop When Your File Is Thin
Get three to four quotes, and get them on the same day, because rates move. A mortgage broker typically has access to 20-plus lenders and knows which ones tolerate a 600 score with a 45% debt-to-income ratio. Credit unions are often more flexible on manual underwriting than big banks. Compare the Loan Estimate line by line, not just the headline rate.
Pay attention to APR, but don’t treat it as gospel. On a 30-year loan where you plan to refinance in three years, points and lender fees matter more than the APR spread. And if you’re sitting closer to 640, the pricing picture is meaningfully different from a 580 file, so it’s worth reading what a 640 score really costs compared with the tier above it before you commit to a lender.
Buy Now or Wait a Year?
Run the actual math. Say you rent for $1,900 a month. Waiting 12 months to reach a 680 score costs $22,800 in rent and whatever the home appreciates in that time. If prices rise 3% on a $300,000 house, that’s another $9,000. Total cost of waiting: about $32,000.
The benefit of waiting is a lower rate. Dropping from 8.4% to 6.9% saves roughly $290 a month, or $3,480 a year. It takes nine years to recoup what you spent waiting, and that’s before counting the equity you didn’t build.
Refinancing later flips the math. If you buy at 8.2% today and rates fall, a refinance at 6.9% saves about $280 a month. Closing costs on a $300,000 refinance run $4,500 to $6,500, so the break-even lands around 18 to 24 months. That’s a realistic timeline if you spend those months cleaning up your credit file. Watching the broader direction of the market helps too, and this breakdown of where mortgage rates are likely to land by 2027 gives you a reasonable planning range rather than a guess.
Clean Up the File Before You Apply
Approval problems with bad credit usually come from small, avoidable mistakes in the final weeks, not from the score itself.
Don’t open a new credit card or finance a car between pre-approval and closing. A single new inquiry can knock 5 to 10 points off, and a new monthly payment can push your debt-to-income ratio over the line. Don’t close old credit cards either, even the ones you never use; closing them cuts your available credit and raises utilization overnight.
Document every large deposit. A $4,000 transfer from a parent is a gift, not income, and underwriters want a signed gift letter plus a bank statement showing where it came from. Cash deposits over a few hundred dollars get flagged, so keep money in the account and let it season for at least 60 days.
Write a short letter of explanation for any collection account, medical bill, or gap in employment. Underwriters respond well to specifics: the account went to collections during a layoff in March 2023, it was paid in full in June 2024, and here’s the confirmation. Vagueness gets files declined; detail gets them approved.
Get the paperwork in order, get two or three quotes, and let the numbers decide. A bad credit score is a starting position, not a final verdict. Two hours with a broker and $600 paid toward a maxed-out card can move the rate more than twelve months of waiting for the market to cooperate.