The score on your banking app is not the score your mortgage lender will pull. Lenders use FICO models 2, 4 and 5, built specifically for mortgage underwriting, and they take the middle of your three bureau scores. Those numbers often sit 20 to 40 points below the VantageScore that free apps show you. That gap matters, because mortgage pricing has cliffs in it. A 618 and a 622 are not the same loan.
Here is what actually works, in the order that gets results fastest.
Start with the score that counts, not the one you’re shown
Pull all three reports at annualcreditreport.com. You want Equifax, Experian and TransUnion, because the middle score is the one that decides your rate and your loan program. If two bureaus show a clean file and one shows a collection you have never heard of, that third report is the one dragging your application down.
Know the thresholds before you start fixing anything. Conventional loans generally need 620. FHA goes down to 580 with 3.5% down, and 500 with 10% down. Above 740 you get the best pricing. So the target isn’t 850, it’s the next cliff above wherever you sit today.
Dispute the errors first, because they’re free points
Roughly one in five credit reports contains a material error, and mortgage underwriting is unforgiving about them. The four worth hunting for:
- A collection that was paid years ago but still reports an open balance
- A late payment marked on a month when the account was current
- The same debt reported twice by a collector and the original creditor
- A credit limit reported lower than your actual limit, which silently inflates your utilization
That last one is the quiet killer. If your card reports a $2,000 limit when it’s really $5,000, your utilization looks two and a half times worse than it is. One phone call to the issuer fixes it. Disputes take about 30 days, so start them the moment you decide to buy, not the week you apply. If your history is speckled with missed payments, it helps to understand what lenders actually see when you have late payments before you write your first dispute letter.
Pay balances down before the statement date
Utilization is about 30% of your score and it is the only factor you can change in a single billing cycle. The detail most people miss: issuers report balances at statement closing, not at the due date. Paying on the due date does nothing for your score. Paying three days before the statement cuts does.
Here’s the math. A card with an $8,000 limit and a $3,200 balance is at 40% utilization. Get that balance to $700 and it reports at 9%. Under 10% is where mortgage underwriters stop flinching. Under 30% is acceptable. Each individual card gets scored too, so spreading a balance across three cards at 20% each beats loading one card to 60%.
Also ask for limit increases on cards you’ve held for a year or more. Many issuers do a soft pull for this, which costs you nothing.
Don’t close the old cards
Length of credit history is 15% of your score, and closing your oldest account shortens your average age while cutting the credit available to you. Both hurt. A card you never use still helps you, as long as it stays open and stays clean. Put a small recurring charge on it and set autopay.
The same logic applies to new credit. Every new account trims a few points and pulls your average age down. If you’re within a year of applying for a mortgage, stop opening cards.
Handle collections with your eyes open
Paying a collection does not delete it. It updates to “paid,” which helps, but a five-year-old collection still reports as a five-year-old collection with a fresh payment date. Some scoring models read that new activity as a negative and your score can dip for a month or two.
Ask for a pay-for-delete in writing. Collectors rarely agree, but the ask costs nothing. Never pay a collection in the same week you plan to apply without running it past a loan officer first. If your file is rough, the honest playbook for buying with bad credit walks through which problems to fix and which ones to simply disclose.
If your file is thin, build it on purpose
No credit is not the same as bad credit, and it fails differently. Underwriters want to see at least three tradelines with 12 months of clean history. A secured card, a credit-builder loan from a local credit union, and being added as an authorized user on a family member’s seasoned card will get you there in about a year. If you’re starting from nothing, read up on buying a house with no credit history so you know what a blank file can and can’t get approved for.
Know how many points you actually need
Chasing a perfect score wastes months you could spend building a down payment. Aim for the next threshold instead. On a $320,000 loan, moving from a 640 to a 720 might take your rate from around 7.1% to 6.5%, which is roughly $127 a month, or about $45,000 across the life of the loan.
What those middle tiers really cost you is worth checking in advance. Buying with a 620 credit score means conventional financing with loan-level price adjustments baked into the rate. At a 580 credit score, FHA is usually the realistic path, and the mortgage insurance premium is part of your monthly math for years.
What to avoid in the six months before you apply
- Financing a car, furniture or appliances, even at 0%
- Co-signing a loan for anyone, including family
- Transferring a balance to a new card and closing the old one
- Opening five disputes at once, which can stall underwriting while they’re investigated
- Changing jobs mid-process if any part of your income is commission or bonus based
Lenders re-pull credit right before closing. A new auto loan between pre-approval and closing can sink a file that was already approved, and it happens more often than people think.
A realistic 90-day plan
Week 1: Pull all three reports, download them as PDFs, and highlight every error, every balance over 30% utilization, and every collection.
Weeks 2 to 4: File disputes online with documentation. Call issuers about incorrect limits. Request limit increases on your oldest three cards.
Weeks 4 to 8: Pay every revolving balance below 10%, timed to land before each statement date. Don’t close anything. Don’t open anything.
Weeks 8 to 12: Re-pull your scores and compare them to where you started. Most people who do this move 40 to 80 points, and the biggest jumps come from utilization, not from disputes.
Then take the new numbers to a broker before you fall in love with a house. A broker can run your file through an automated underwriting system and tell you exactly which threshold you’re closest to clearing, and whether three more months of the same routine would save you $100 a month or $12.