What Mortgage Lenders Actually Look At
Your credit score opens the door, but lenders evaluate your full financial picture before approving a mortgage — whether you're purchasing a home or refinancing an existing loan. They're answering one fundamental question: Can this borrower reliably make payments for the next 15–30 years? To answer that, they look at five core areas: credit score and history, debt-to-income ratio, down payment and reserves, employment stability, and the property itself.
Credit Score Requirements by Loan Type
Different mortgage programs have different minimum score requirements, and a higher score means a better interest rate — which translates to thousands saved over the life of the loan.
| Loan Type | Min. Score | Down Payment | PMI Required? | Best For |
|---|---|---|---|---|
| Conventional | 620 (640+ preferred) | 3%–20% | Yes, if <20% down | Good credit, stable income |
| FHA | 580 (500 with 10% down) | 3.5% (10% if below 580) | Yes (MIP, for loan life) | Lower credit, first-time buyers |
| VA | No official min (620+ typical) | 0% | No | Veterans, active military |
| USDA | 640 (typical) | 0% | Guarantee fee (similar to PMI) | Rural areas, moderate income |
| Jumbo | 700–720+ | 10%–20% | Varies | High-value properties |
The Real Cost of a Lower Score
On a $300,000, 30-year fixed mortgage, the difference between a 620 score (roughly 7.5% rate) and a 740 score (roughly 6.5% rate) means about $200 more per month — or roughly $72,000 more in total interest over the life of the loan. Every point of credit improvement before applying has real dollar value.
Understanding Debt-to-Income Ratio (DTI)
Your DTI is the percentage of your gross monthly income that goes toward debt payments. Lenders use two DTI calculations:
- Front-End DTI: Your housing costs (mortgage principal, interest, taxes, insurance) divided by gross monthly income. Most lenders want this at or below 28%.
- Back-End DTI: All monthly debts (housing + car payments + student loans + credit card minimums + any other obligations) divided by gross monthly income. Most lenders want this at or below 36%, though some programs allow up to 43% or even 50% with compensating factors.
Example: If you earn $6,000/month gross, a 36% back-end DTI means all your monthly debts (including the new mortgage) should total no more than $2,160. If you currently pay $400/month in car and student loan payments, your maximum mortgage payment would be about $1,760.
How to Improve Your DTI
There are only two levers: increase income or reduce debt. Before applying for a mortgage, consider paying off smaller debts entirely (car payments close to payoff, small credit card balances, personal loans). Each debt you eliminate adds directly to your available DTI budget for the mortgage.
Down Payments: How Much Do You Really Need?
The 20% down payment is a popular benchmark, but it's not a requirement for most loan programs. Here's what's actually required:
- Conventional: As low as 3% for first-time buyers ($9,000 on a $300K home). Under 20% triggers Private Mortgage Insurance (PMI), typically $50–$200/month, which drops off once you reach 20% equity.
- FHA: 3.5% down ($10,500 on a $300K home) with 580+ score. Includes upfront and annual mortgage insurance premiums (MIP) for the life of the loan.
- VA: 0% down for eligible veterans and active military. No mortgage insurance. One of the strongest mortgage benefits available.
- USDA: 0% down for eligible rural and suburban properties. Income limits apply.
Beyond the Down Payment: Closing Costs & Reserves
Budget for 2%–5% of the purchase price in closing costs (on a $300K home, that's $6,000–$15,000). These cover appraisal fees, title insurance, attorney fees, prepaid taxes, and insurance. Additionally, lenders typically want to see 2–3 months of mortgage payments in reserve savings after closing. Don't drain your savings for a larger down payment if it leaves no cushion.
Choosing the Right Loan Type
Fixed-Rate vs. Adjustable-Rate (ARM)
A fixed-rate mortgage locks your interest rate for the entire loan term — your payment never changes. An adjustable-rate mortgage (ARM) offers a lower initial rate for a set period (typically 5, 7, or 10 years), then adjusts based on market rates.
For most homebuyers planning to stay in their home long-term, a fixed-rate mortgage provides certainty and protection against rising rates. ARMs can make sense if you're confident you'll move or refinance within the initial fixed period — but they carry risk if rates increase.
15-Year vs. 30-Year Term
A 15-year mortgage has higher monthly payments but a significantly lower interest rate and dramatically less total interest paid. A 30-year mortgage is more affordable monthly but costs much more overall. On a $300,000 loan, a 30-year mortgage at 6.5% means roughly $382,000 in total interest — while a 15-year at 5.8% means roughly $151,000 in total interest. That's a $231,000 difference.
Can't afford the 15-year payment? There's a middle ground: take the 30-year mortgage but use biweekly payments to pay it off in roughly 25 years while saving tens of thousands.
The Pre-Approval Process
Getting pre-approved before house shopping is essential. It tells sellers you're a serious, qualified buyer — and it tells you exactly how much house you can afford. Here's what to expect:
- Gather Documents: You'll need pay stubs (last 30 days), W-2s (last 2 years), tax returns (last 2 years), bank statements (last 2–3 months), and a valid ID.
- Application: Complete a mortgage application (Uniform Residential Loan Application). The lender will pull your credit from all three bureaus.
- Underwriting Review: The lender verifies your income, assets, debts, and credit history. This typically takes a few days to a week.
- Pre-Approval Letter: You receive a letter stating the maximum loan amount you qualify for, subject to finding a suitable property and final underwriting.
Pre-Qualification vs. Pre-Approval
Pre-qualification is a quick, informal estimate based on self-reported information — it carries little weight with sellers. Pre-approval involves verified documents and a credit pull — it's a much stronger signal. Always get fully pre-approved before making offers.
The Biweekly Payment Strategy
One of the simplest and most powerful strategies for existing homeowners (or soon-to-be homeowners) is switching from monthly to biweekly mortgage payments. Here's how it works:
With monthly payments, you make 12 payments per year. With biweekly payments, you pay half your monthly amount every two weeks. Because there are 52 weeks in a year, that works out to 26 half-payments — or 13 full payments per year instead of 12. That extra payment goes directly to your principal balance.
The Impact on a Typical Mortgage
- $300,000 loan at 6.5%, 30-year fixed: Monthly payments total roughly $682,000 over the life of the loan. With biweekly payments, you'd save approximately $28,000–$35,000 in interest and pay off the mortgage roughly 4–5 years early.
- $400,000 loan at 7%, 30-year fixed: Biweekly payments save approximately $45,000–$55,000 in interest and cut about 5–6 years off the loan.
The best part: this doesn't require refinancing, changing lenders, or making a dramatic lifestyle change. It's one extra payment per year, split across your normal pay cycles.
Calculate Your Biweekly Savings →
Refinancing: When and Why It Makes Sense
Refinancing replaces your current mortgage with a new loan — ideally at a lower interest rate, a shorter term, or both. If your credit score has improved since you originally bought your home, refinancing can save you significant money over the remaining life of your loan.
When to Consider Refinancing
Refinancing typically makes sense when you can lower your interest rate by at least 0.5%–1%, though the exact threshold depends on your loan balance and how long you plan to stay in the home. Other reasons to refinance include switching from an adjustable-rate mortgage to a fixed rate for stability, shortening your loan term from 30 years to 15 or 20 years to build equity faster, or eliminating private mortgage insurance (PMI) once you've reached 20% equity.
How Your Credit Score Affects Refinancing
Refinancing is essentially applying for a new mortgage, so lenders evaluate your credit the same way they would for a purchase loan. A higher score means a lower rate, and even a small rate reduction on a large balance translates to meaningful savings. For example, dropping from 7% to 6% on a $300,000 loan saves roughly $60,000+ in total interest over 30 years.
The Break-Even Point
Refinancing has closing costs, typically 2%–5% of the loan amount. Divide your closing costs by your monthly savings to find your break-even point — the number of months it takes for the savings to exceed the costs. If you plan to stay in the home longer than that, refinancing is likely worth it.
Cash-Out Refinancing
A cash-out refinance lets you borrow more than you currently owe and take the difference in cash. This can be useful for home improvements, debt consolidation, or major expenses — but it increases your loan balance, so it should be approached carefully. Your credit score and equity position determine how much you can borrow and at what rate.
Pre-Application Checklist
Use this checklist 3–6 months before applying for a mortgage or refinance:
- ☐ Pull credit reports from all three bureaus and check for errors
- ☐ Dispute any inaccuracies on your reports
- ☐ Pay down credit card balances to below 30% utilization (below 10% is ideal)
- ☐ Do NOT open new credit accounts or take on new debt
- ☐ Do NOT close old credit cards (this hurts utilization and average age)
- ☐ Calculate your DTI and identify debts you can pay off
- ☐ Start saving for down payment, closing costs, and reserves
- ☐ Gather 2 years of tax returns and W-2s
- ☐ Gather 2–3 months of bank statements
- ☐ Avoid large deposits or withdrawals that can't be documented
- ☐ Keep employment stable — avoid job changes if possible
- ☐ Get pre-approved by at least 2–3 lenders to compare rates