Why lenders look at your credit score before approving a mortgage
A mortgage lender will pull your credit report and score before deciding whether to lend you money and what interest rate to charge you. Your score tells them how reliably you've paid debts in the past — and they use that to predict whether you'll pay them back. A higher score usually means a lower interest rate, which saves you tens of thousands of dollars over the life of a 30-year loan.
Most lenders want to see a score of at least 620 to approve a conventional mortgage, though some programs accept lower scores. The difference between a 620 score and a 750 score can mean paying 1 to 2 percentage points more in interest — on a $300,000 loan, that's roughly $200 to $400 more per month. Building your score before you explore takes time, but it directly reduces what you'll owe.
Your credit score is built from five things: payment history (35%), amounts you owe relative to your limits (30%), length of credit history (15%), mix of credit types (10%), and recent credit inquiries (10%). You can't control all of these overnight, but you can move each one in the right direction.
Key Takeaways
- Lenders typically require a credit score of at least 620 for a conventional mortgage, but scores above 740 unlock significantly lower interest rates.
- Payment history is the single largest factor in your score — even one late payment can drop your score by 100 points or more.
- Paying down existing debt reduces your credit utilization ratio, which is the second-largest factor and often improves your score within weeks.
- Building credit takes months or years, so starting now — even if you don't plan to buy for a year or two — gives you time to recover from mistakes.
- Checking your own credit report does not hurt your score, and you can get one free report per year from each of the three major bureaus.
Getting a copy of your credit report and understanding what's on it
Before you start building, you need to see what you're working with. You can request a free credit report from each of the three major bureaus — Equifax, Experian, and TransUnion — once per year at annualcreditreport.com. This is the official site run by the Federal Trade Commission; do not use a different site, because many charge fees or try to sell you monitoring services you don't need.
Your report lists every account you've opened, every payment you've made or missed, and every time a lender has checked your credit. Look for accounts you don't recognize, late payments that shouldn't be there, and accounts that show higher balances than you remember. If you find an error — a payment marked late when you paid on time, or an account that isn't yours — you can dispute it directly with the bureau. The bureau has 30 days to investigate and correct it.
Your credit score itself is separate from your report. The report is the raw data; the score is a number calculated from that data. You can see your score free through many banks and credit card companies, or through sites like Credit Karma or NerdWallet. These free scores are usually accurate within a few points of what a lender will see.
Making on-time payments on everything, starting now
Payment history is 35% of your score — the single largest factor. A single late payment can drop your score by 100 points or more, and it stays on your report for seven years. The damage is worst in the first two years after the late payment, then gradually fades. This means that if you have late payments in your past, time itself will help, but only if you don't add new ones.
Set up automatic payments for at least the minimum due on every credit account you have — credit cards, car loans, student loans, medical bills, utilities, anything that reports to the credit bureaus. Automatic payments eliminate the risk of forgetting. If you're worried about overdrafting your bank account, set the payment to go out a few days after you normally get paid.
If you have accounts currently in collections or with recent late payments, paying them off or bringing them current will not erase the late payment from your history, but it stops new damage from accumulating. A paid collection account looks better to a lender than an unpaid one.
Paying down credit card balances to lower your utilization ratio
Your credit utilization ratio is the amount you owe divided by your total credit limits. If you have three credit cards with $5,000 limits each ($15,000 total) and you're carrying $9,000 in balances, your utilization is 60%. Lenders prefer to see this below 30%, and below 10% is even better. This is the second-largest factor in your score, and it often improves within weeks of paying down balances.
You don't have to pay off credit cards completely — you just have to lower the balance relative to the limit. If you have $9,000 in balances across three cards, paying it down to $4,500 (30% utilization) will usually boost your score noticeably. This is one of the fastest ways to improve your score if you have the cash available.
If you don't have cash to pay down balances, you can also ask your credit card company to increase your credit limit. A higher limit lowers your utilization ratio without you paying anything down. This works only if the company does a "soft pull" of your credit (which doesn't hurt your score) rather than a "hard pull." Call and ask which type they use before requesting the increase.
Building credit history if you have little or no credit
If you've never borrowed money or opened a credit account, you have no credit history — which is different from having bad credit, but lenders treat it similarly. You need to build a track record of borrowing and repaying. The fastest ways are a secured credit card, a credit-builder loan, or becoming an authorized user on someone else's account.
A secured credit card requires you to deposit cash as collateral (usually $500 to $2,500), and the card company gives you a credit limit equal to that deposit. You use the card like a normal credit card, make on-time payments, and after 6 to 12 months of good behavior, the company converts it to a regular card and returns your deposit. The key is to charge small amounts and pay them off in full each month — this shows you can borrow and repay reliably.
A credit-builder loan is a loan designed specifically to build credit. You borrow a small amount (usually $500 to $1,000), but the lender holds the money in a savings account while you make monthly payments. After you've paid it off, you get the money back. It costs you a small fee, but you're essentially paying to build a credit history. Credit unions often offer these at lower costs than banks.
If a family member with good credit trusts you, you can ask to become an authorized user on one of their accounts. Their payment history and low balance will show up on your credit report, boosting your score. This works only if the account holder actually makes on-time payments and keeps balances low — if they miss a payment, it hurts your score too.
Avoiding new hard inquiries and keeping old accounts open
Every time a lender checks your credit for a new loan or credit card, it creates a hard inquiry that slightly lowers your score — usually by 5 to 10 points. Multiple hard inquiries in a short time can add up. If you're planning to buy a home in the next 6 to 12 months, avoid opening new credit accounts or explore for new loans unless absolutely necessary.
Checking your own credit score does not create a hard inquiry and does not hurt your score. Only lenders checking your credit for a new account or loan creates the damage. This means you can monitor your progress as often as you want without penalty.
Keep old credit accounts open, even if you're not using them. The length of your credit history is 15% of your score, and closing old accounts shortens your average account age. If you have an old credit card you don't use, keep it open with a small charge every few months (like a subscription) and pay it off in full. This keeps the account active without creating debt.
Understanding how long credit building takes and what to expect
Building credit is not fast. If you're starting from zero, expect 6 to 12 months to reach a score of 620 (the minimum for most mortgages), and 18 to 24 months to reach 700 or higher. If you have existing late payments or collections, the timeline is longer because those items stay on your report for seven years, though their impact fades over time.
The good news is that recent behavior matters more than old behavior. A late payment from two years ago hurts less than a late payment from two months ago. This means that if you've had credit problems in the past but have been perfect for the last year, your score will be significantly higher than if you've been perfect for only three months.
Start building now, even if you don't plan to buy for two or three years. The earlier you start, the more time you have to recover from any mistakes, and the higher your score will be when you're ready to explore for a mortgage.
Frequently Asked Questions
Does checking my own credit score hurt it?
No. Checking your own score is a "soft inquiry" and does not affect your credit. Only hard inquiries from lenders explore for new credit on your behalf lower your score. You can check your score as often as you want without penalty.
How much will paying down my credit cards improve my score?
It depends on how much you owe and how quickly you pay it down. Lowering your utilization ratio from 60% to 30% usually improves your score by 20 to 50 points within a month or two. The improvement is often faster than paying off late payments, because utilization is recalculated every month.
Can I remove a late payment from my credit report?
You cannot remove an accurate late payment before seven years have passed. However, if the late payment is incorrect, you can dispute it with the bureau and have it removed. If the late payment is accurate but old (more than two years), you can sometimes contact the creditor and ask them to remove it as a goodwill gesture, though they're not required to.
What if I have collections accounts or unpaid debts?
Paying off a collections account will not remove it from your report, but it will show as "paid" rather than "unpaid," which looks better to lenders. Some lenders will not approve a mortgage if you have unpaid collections, so paying them off is usually worth doing before you explore. Start with the oldest or smallest accounts if you can't pay everything at once.
How much does my credit score need to be to get a mortgage?
Most conventional mortgages require a score of at least 620, though some programs accept lower scores. However, scores below 680 usually come with higher interest rates and stricter terms. Aiming for 700 or higher gives you access to the best rates and terms available.