The Quick Read: Start with the four things an underwriter weighs: credit, debt-to-income ratio, verified assets, and stable income. Prep strengthens your file, but it never guarantees approval. The biggest levers are fixing credit report errors, paying down revolving balances, keeping your bank statements clean, and holding off on new debt. Fix the weakest area first, because strength in one area can sometimes offset weakness in another.
What Do Underwriters Actually Weigh?
Underwriters judge credit, income, debt, assets, and the property together. The file goes through an automated system or, less often, a human underwriter who reviews it by hand.
Conventional payment estimate
The starting figures are an example price at the first-time buyer’s minimum down payment. Replace them with yours.
Editable benchmark: 7.32% as of October 22, 2026 · Freddie Mac 30-year average via FRED®. A conventional market reference, not a conventional loan quote.
Estimate seeded at the low end of Fannie Mae’s published range (0.58%–1.86% a year); the insurer prices the actual premium on the score and the leverage. Applies only above 80% loan-to-value.
Illustrative starting assumptions: a $350,000 price, the first-time buyer’s minimum down payment, a thirty-year term at the current Freddie Mac benchmark, mortgage insurance at the low end of Fannie Mae’s published range, and property taxes and insurance estimated at typical national rates. Every field is editable.
Illustrative estimate only — not a Loan Estimate, approval, quote, or commitment to lend. The rate field carries the weekly Freddie Mac thirty-year conventional benchmark, a market reference and not a conventional loan quote; your rate is set by the lender at lock. The mortgage insurance figure is an editable estimate seeded from Fannie Mae’s published typical range, not a premium quote; the insurer prices the actual premium, and the cancellation month assumes scheduled payments with no extra principal and no change in value. Taxes, insurance and dues are editable estimates; closing costs are not included. Conforming loan limits apply by county. Licensed in sixteen states for consumer mortgages.
Across the wholesale lenders Lendmire works with for its conventional loan programs, the automated finding governs most files. The system reads your credit, income, debts, and cash. Then it returns a recommendation and a list of documents the lender must collect.
Think of the factors as a seesaw. A big down payment and solid savings can make a higher debt load easier to accept. A thin cash cushion makes the same debt load harder. Nothing works in isolation, which is why a single number never tells you the outcome.
Lenders can also add their own stricter rules, called overlays. Fannie Mae says lenders may be more conservative than its minimums if they apply that approach consistently. Two lenders can look at the same file and answer differently.
Where Is Your File Weakest?
Find the weak spot before you spend effort anywhere else. This table maps each common problem to the first fix.
| Weak area | Why it matters | First fix |
|---|---|---|
| Credit score | Affects eligibility and pricing | Dispute errors, cut balances |
| High debt load | Pushes DTI toward the ceiling | Pay down, avoid new debt |
| Thin savings | Less cushion for closing and reserves | Build and document cash |
| Recent job change | Income history looks short | Talk to your loan officer first |
| Unexplained deposits | Funds must be verified | Gather paper trail |
Lead times differ. Credit report errors can sometimes be fixed within weeks. Debt paydown and savings take longer, so start there if those are your gaps.
Credit Moves That Matter Before You Apply
Pull your reports at annualcreditreport.com and dispute any errors. The federal consumer-finance regulator’s home loan toolkit says correcting errors may raise a score in 30 days or less. Not every correction moves a score, but a wrong late payment is worth removing.
Next, look at revolving balances. These are credit cards and similar accounts with no fixed end date. Paying them down lowers the payment counted against you. It also helps your score, because a lender sees a smaller share of your limits in use.
Timing matters here. A balance has to report to the bureaus before the lender pulls your credit. Pay down a card in the same week you apply, and the old balance may still be what the lender sees.
A paid-off card does not have to be closed. Fannie Mae removed the requirement to close a revolving account that is paid to zero at closing, though that update is old, so confirm current treatment with your loan officer. Closing cards can shorten your credit history and hurt utilization, so don’t do it as a reflex.
Finally, stop opening new credit. The federal consumer-finance regulator warns that even financing a refrigerator could make a mortgage harder to get.
Is 620 Still the Magic Number?
Not as a universal rule. Fannie Mae removed the 620 minimum score for Desktop Underwriter files created on or after November 16, 2025. Its automated system now relies on its own risk analysis.
Here is the catch. The wholesale conventional programs we place files with generally start at a 620 decision score. That floor is 640 on an adjustable rate under manual underwriting. Manual underwriting has its own minimums, and lenders can add overlays on top of agency rules. So the agencies loosened, but the lender in front of you may not have.
Read this as good news for borderline files, not permission to ignore credit. A higher score still helps with eligibility and with how mortgage insurance and pricing treat your file. Fannie Mae still adjusts loan-level pricing by credit score.
How Do You Lower Your Debt-to-Income Ratio?
Debt-to-income, or DTI, is your total monthly debt payments divided by your gross monthly income. The CFPB notes that limits differ by product and lender. On conventional files, the automated ceiling in our programs is 50%.
The old 43% figure comes from a past Qualified Mortgage rule. It is not today’s automated limit. Manually underwritten loans are tighter: 36%, or up to 45% when your score and reserves meet the Eligibility Matrix.
Here is what counts, per Fannie Mae’s debt-to-income rules: your new housing payment, plus long-term and significant short-term debts. Support payments that run beyond ten months count too. A net loss on a rental property counts as well.
Run a simple modeled example. Say your gross monthly income is 100 units and your debts, including the new housing payment, total 48 units. That is a 48% DTI. Pay off a card that costs 4 units a month, and you land at 44%. Same income, same house, a much safer file.
Three ways to move the ratio:
- Pay off installment loans that are near their end. Debts with under ten months left usually drop out of the count.
- Pay down revolving balances, which count at the minimum payment.
- Avoid adding any new monthly obligation until you close.
Consolidating debt can lower payments, but a new loan is new credit. Talk it through with your loan officer before you do it.
Income and Employment: What Lenders Need to See
Lenders must document that your income is stable, has a history of receipt, and is likely to continue. For paychecks, they look for a reliable pattern over the last two years. A shorter history can work when positive factors offset it.
Job changes are not automatically a problem. A move within the same field, for similar or better pay, usually reads fine. Gaps are different. With multiple employers, Fannie Mae allows no gap greater than one month in the most recent 12 months unless the income is seasonal.
Self-employed borrowers face a heavier paper load. Anyone with a 25% or greater ownership interest in a business follows the self-employed rules. Expect to provide traditional personal-income documentation along with business documents. If you juggle several jobs, a two-year history for each income source is recommended, and a shorter one (no less than 12 months) may work with offsetting strengths.
Watch for income with an expiration date. If it ends, it generally must continue at least three years from the note date to count.
Document checklist to gather early:
- Recent pay stubs and W-2s
- Traditional personal-income documentation if you are self-employed or have variable income
- Two months of bank statements for every account you will use
- Letters explaining any gaps or unusual deposits
- A record of any gift funds, with a donor letter
Down Payment, Reserves, and Large Deposits
Every dollar you use for the down payment, closing costs, and reserves must be verified. Reserves are savings left over after closing. Unverified funds are not acceptable.
On leverage, here is what the programs we place files with allow on a principal residence. A first-time buyer on a one-unit home with a fixed rate can go to 97% LTV, which means 3% down. Loan-to-value, or LTV, is the loan amount divided by the home’s value. Otherwise the standard purchase limit is 95% LTV, or 5% down. Two- to four-unit principal residences also top out at 95%. Second homes reach 90%, and investment property is lower. If your plan involves a rental, occupancy sets the leverage, and a different program applies. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
Mortgage insurance is required above 80% LTV. You can request cancellation at 80% of the original value with good payment history, no subordinate liens, and no decline in value. The servicer must end it automatically at 78%. Typical published annual premiums run 0.58% to 1.86% of the balance, a range and not a quote. Putting more down shrinks or removes this cost. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.
Now the part that trips people up: large deposits. Under Fannie Mae’s depository account rules, a large deposit is a single deposit over 50% of your total monthly qualifying income. Lenders typically review the most recent two months of statements.
On a purchase, an undocumented large deposit gets subtracted from your verified funds. The lender then checks whether what remains still covers everything. A deposit is not a death sentence. Payroll and tax refunds that are clearly identifiable need less explaining. A cash gift from a cousin with no paper trail does not.
Your Pre-Application Timeline
Work backward from the day you plan to apply.
| Window | What to do |
|---|---|
| 6+ months out | Pull credit reports, dispute errors, start paying down cards |
| 3 months out | Stop new credit, build savings, keep jobs stable |
| 1 month out | Gather documents, explain deposits, compare lenders |
| Application week | Submit complete paperwork, keep balances low |
| Until closing | Change nothing financial without calling your loan officer |
Not everyone has six months. Compress the plan, but keep the order. Credit and debt first, documentation second.
Mistakes That Quietly Sink Files
Most denials come from ordinary moves. Each one below has a reason.
- Financing a car or furniture. A new payment raises DTI and adds an inquiry.
- Moving money between accounts without records. The lender can’t source funds it can’t trace.
- Co-signing for someone. The debt may land in your ratio.
- Switching jobs mid-process. Income history shortens and the lender may re-underwrite.
- Paying off collections or accounts at the last minute without advice. Ask first, because timing and type matter.
- Applying everywhere over several months. Shop in a tight window and compare the Loan Estimate each lender gives you.
Pre-approval is not a lock. If you disclose new debts or lower income before closing, the lender recalculates DTI and decides whether to re-underwrite. Lendmire’s piece Can a Conventional Loan Pre-Approval Be Lost Before Closing? walks through that risk in detail.
Edge Cases Where the Usual Advice Bends
Thin or no credit. Fannie Mae’s Desktop Underwriter can now weigh cash-flow data from your bank accounts and handle borrowers with no credit score. If it asks for nontraditional credit, at least two credit references per borrower are required.
Renters with a clean payment history. The system can use positive rent history from a credit report or a 12-month asset verification report. It only counts the good news. Missed rent isn’t held against you. Eligibility rules have changed over time, so ask your loan officer what applies now.
Someone else pays your debt. To exclude it, the lender needs 12 months of cancelled checks or statements showing no late payments.
Past credit events. The agencies set waiting periods: four years from a Chapter 7 discharge, seven from a foreclosure, and four from a short sale or deed-in-lieu. They can be shorter with documented extenuating circumstances.
Affordable programs. HomeReady and Home Possible carry an income limit of 80% of area median income. Those programs can fit lower-income buyers with modest down payments.
Should You Add a Co-Borrower or Change the Plan?
A co-borrower adds income, but also their debts and credit. It helps only when their file is stronger than yours. A smaller loan or lower price is another lever, since it lowers payment, DTI, and often the mortgage insurance you owe.
If you’ve checked everything and conventional still doesn’t fit, other programs exist. FHA and VA loans use different rules, and some borrowers fit better there. Conventional tends to reward strong files with lower mortgage insurance costs. It also cancels that insurance, which not every program does.
If You Are Denied or Not Ready
Read the denial reason first. It names the problem: credit, DTI, assets, income, or the property. Then decide between two paths.
Fix and reapply when the issue is something you can change, like a balance or a documentation gap. Switch programs when the issue is structural, such as a DTI that no paydown will fix in time.
Waiting is not failure. A few months of disciplined prep often moves a borderline file. It is also honest to say no prep guarantees a yes. The lender’s guidelines, the appraisal, and the full file review decide.
Key Terms Defined
Debt-to-income ratio (DTI): Your monthly debt payments divided by your gross monthly income.
Loan-to-value (LTV): The loan amount divided by the home’s value.
Overlay: A lender’s own rule that is stricter than the agency minimum.
Reserves: Verified savings you still hold after paying the down payment and closing costs.
Mortgage insurance: Coverage the borrower pays for when putting down less than 20%; it protects the lender, not you.
Large deposit: A single deposit over 50% of your monthly qualifying income that needs a documented source.
Frequently Asked Questions
Does my credit score alone decide approval?
No. The score is one input. Debt, income, assets, down payment, and the property all count. A stronger showing in one area can sometimes offset a weaker one, subject to lender guidelines and full file review.
What DTI is too high for a conventional loan?
It depends on how the file is underwritten. Our automated programs run to a 50% ceiling. Manual underwriting is 36%, or 45% with the score and reserve factors in the Eligibility Matrix. Lender overlays can be tighter.
Will a large deposit hurt my application?
Not by itself. Lenders look at the last two months of statements and ask you to source deposits over 50% of your monthly qualifying income. Payroll and clearly labeled deposits need little explanation. Undocumented money may be left out of your verified funds.
Should I close my credit cards after paying them off?
Usually not. A card paid to zero can stay open and, under Fannie Mae’s update, carry no payment in your DTI. Closing it may lower your available credit and raise your utilization elsewhere.
How much should I put down to improve my chances?
More down lowers LTV, which can ease eligibility and cut mortgage insurance. The standard purchase limit is 95% LTV on a principal residence, and first-time buyers can reach 97% on a one-unit fixed-rate home. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file.
For your own numbers, request a scenario review with Lendmire.
About Lendmire
Lendmire, NMLS# 2371349, is a mortgage brokerage with consumer lending licenses in 16 states. FHA, VA, conventional and jumbo purchase and refinance loans are arranged through wholesale lending partners, and each application is reviewed individually by the lender. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. CFPB, Your Home Loan Toolkit
2. Fannie Mae SEL-2025-09 announcement
3. CFPB
4. Fannie Mae Selling Guide B3-6-02, Debt-to-Income Ratios
This article is part of Lendmire’s conventional loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How to Check a Condo Is Warrantable for a Conventional Loan · How to Get From a Conventional Loan Pre-Approval to Clear to Close · How to Refinance a Conventional Loan on a Condo
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.