Your credit score affects your mortgage rate more than any other factor. Here are the minimums by loan type, how each score tier affects your monthly payment, and the fastest ways to improve your score.
Credit Score Minimums — By Loan Type
No Official Min (~580)
580
500
640
620
740–760+
Why Your Credit Score Matters So Much
Your credit score is the single most controllable factor affecting your mortgage rate. The difference between a 620 and a 760 score can translate to a 0.75–1.5% higher interest rate — which on a $350,000 loan costs $175–$350 more per month and over $60,000–$125,000 more in total interest over 30 years.
Unlike income or debt ratio — which reflect your actual financial situation — your credit score can be improved through deliberate actions over months. This makes credit score optimization one of the highest-ROI financial activities a prospective homebuyer can undertake.
How Credit Score Affects Your Mortgage Rate
Credit Score Range
30-Yr Rate*
Monthly Payment*
vs Top Tier
30-Yr Extra Cost
760–850 (Excellent)
6.50%
$1,896
Baseline
—
700–759 (Good)
6.72%
$1,949
+$53/mo
+$19,080
680–699 (Good)
6.89%
$1,993
+$97/mo
+$34,920
660–679 (Fair)
7.11%
$2,050
+$154/mo
+$55,440
640–659 (Fair)
7.54%
$2,161
+$265/mo
+$95,400
620–639 (Poor)
7.98%
$2,280
+$384/mo
+$138,240
*Estimates on a $300,000 30-year fixed mortgage. Actual rates vary by lender, loan type, down payment, and market conditions.
Which Credit Score Do Lenders Use?
Mortgage lenders pull credit reports from all three bureaus (Equifax, Experian, TransUnion) and use a specific FICO Score model from each:
Equifax: FICO Score 5 (Beacon)
Experian: FICO Score 2 (Experian/Fair Isaac Risk Model v2)
Lenders use the middle score of the three for underwriting. On joint applications, they use the lower of the two middle scores. This is important: if one spouse has a 640 middle score and the other has a 750, the lender uses 640 for qualification — but both incomes can count. Sometimes it makes sense to apply in one person's name if there's a large credit score discrepancy.
7 Ways to Improve Your Credit Score for a Mortgage
Pay down revolving debt (credit cards) — Credit utilization is 30% of your score. Getting each card below 30% utilization (ideally below 10%) can raise your score 20–50+ points within 30–60 days of the update showing.
Dispute errors on your credit report — 20%+ of consumers have errors on their credit reports, per FTC research. Dispute any incorrect late payments, wrong balances, or accounts that aren't yours at AnnualCreditReport.com.
Don't close old accounts — Closing a credit card reduces your available credit and can shorten your average account age, both of which hurt your score.
Become an authorized user — Being added to a family member's well-managed old credit card can add positive history to your report immediately.
Don't apply for new credit — Each hard inquiry drops your score 5–10 points. Avoid any new credit applications for at least 6 months before applying for a mortgage.
Rapid rescore service — Ask your mortgage lender about rapid rescoring. After paying down a card or resolving a dispute, a lender can request an expedited score update in 3–5 business days (vs. the 30–45 days a normal reporting cycle takes).
Pay all bills on time — Payment history is 35% of your FICO score. Set up autopay for all accounts. One 30-day late payment can drop your score 50–100 points and stays on your report for 7 years.
Credit Score Timeline for Mortgage Applicants
Timeframe
Action
Expected Score Impact
3–6 months before applying
Pay down credit card balances
+20–50 points
3–6 months before
Dispute credit report errors
+10–100 points
6+ months before
Stop applying for new credit
Prevents −5 to −15 points per inquiry
6–12 months before
Become authorized user on family card
+10–30 points
Ongoing
Pay all bills on time
Prevents large drops; builds score over time
1 month before
Rapid rescore after payoffs
Reflects recent improvements immediately
Frequently Asked Questions
The minimum varies by loan type: VA loans have no official minimum (lenders typically require 580–620), FHA loans require 580 for 3.5% down or 500 for 10% down, USDA loans require 640, and conventional loans require 620. However, having a score above 740 is where you access the best rates. Even one step up from 680 to 700 can save you $50–100/month.
Yes, but minimally. A mortgage application triggers a 'hard inquiry' which typically reduces your score by 5–10 points. More importantly, if you shop multiple lenders within a 45-day window, all mortgage inquiries count as a single inquiry under FICO's rate-shopping rules. This means you can get quotes from 5 lenders with essentially the same credit impact as applying once.
Quick improvements: paying down credit card balances to under 30% can show in 30–60 days when the next statement posts. Dispute resolutions and rapid rescore services can update scores in 3–10 days. Building from a seriously damaged score (below 580) may take 12–24 months. The 3 highest-ROI actions — paying down cards, disputing errors, and stopping new applications — are achievable within 90–180 days.
No — checking your own credit is a 'soft inquiry' and has no impact on your credit score. You can check your score as often as you want through free services like Credit Karma, Experian's free monitoring, or by visiting AnnualCreditReport.com for your full reports. Hard inquiries only occur when you apply for credit — including mortgage applications.
Disclaimer: Smart Mortgage Guide provides educational content only. We are not a licensed mortgage lender, broker, or financial advisor. Rates, limits, and program details are subject to change. Always consult with a licensed mortgage professional before making financial decisions.