The Quick Read: No single score or debt-to-income limit applies to every refinance. The limits depend on the program, the type of refinance, and how the lender underwrites the file. On the wholesale conventional programs Lendmire works with, the starting point is a 620 decision score and a total debt ratio ceiling of 50% on automated findings. FHA Streamline and VA IRRRL loans skip most of that testing, but they have their own conditions.
The Short Version
- Score and DTI work as a pair. A strong score can buy room on DTI, and a low DTI can offset a thinner score, subject to lender guidelines.
- Automated findings set the ceiling for most conventional files. Manual underwriting is tighter: 36% or 45%, depending on score and reserves.
- Government streamlines are different. They refinance an existing FHA or VA loan with limited or no credit review.
- Cash-out is stricter than rate-and-term. Leverage drops, seasoning rules apply, and the larger loan pushes DTI up.
- Score affects price as well as approval. Even where no hard floor exists, a lower score can raise the cost of the loan.
Key Terms Defined
DTI (debt-to-income ratio) is your total monthly debt payments divided by your gross monthly income. Gross means before taxes.
LTV (loan-to-value) is the loan balance as a percentage of the home’s value. A 95% LTV means you owe 95% of what the home is worth. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
Rate-and-term refinance replaces your current mortgage with a new one and gives you only incidental cash back. It is also called a limited cash-out refinance.
Cash-out refinance replaces your mortgage with a larger one and hands you the difference in cash.
Decision score is the credit score the lender uses to price and approve the file. With more than one borrower, it is usually the middle score of the lowest-scoring borrower.
Net tangible benefit is a government-loan test. The refinance has to leave you measurably better off, such as a lower payment or a more stable loan.
Seasoning is the minimum time you must have held a loan or title before a certain refinance is allowed.
Refinance savings and break-even estimate
The starting figures are an example value with a balance in proportion and a placeholder for costs. Replace them with yours, and enter the current rate from your statement.
Editable benchmark: 7.32% as of October 22, 2026 · Freddie Mac 30-year average via FRED®. A conventional market reference, not a refinance quote.
Illustrative starting assumptions: a $350,000 home value, a $245,000 current balance, a current rate you enter and a remaining term seeded at twenty-five years, closing costs seeded at $5,000 as an editable placeholder (not a fee quote) and rolled into the new loan, a thirty-year term at the current Freddie Mac benchmark, 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 new rate field carries the weekly Freddie Mac thirty-year conventional benchmark, a market reference and not a refinance quote; a refinance is priced by the lender at lock, and the current rate, the remaining term and the closing costs are figures you enter. The current payment is estimated from the balance, the current rate and the remaining term; the break-even divides the closing costs by the monthly saving and ignores the interest effect of a longer term. On the VA IRRRL the funding fee is added to the loan unless the veteran is exempt. Taxes and insurance are editable estimates. Licensed in sixteen states for consumer mortgages; Lendmire is a broker, never the lender.
How Do Lenders Weigh Score and DTI Together?
Lenders read the two numbers as one picture. Your score tells them how you have handled debt. Your DTI tells them how much room your budget has for the new payment. Neither stands alone.
Think of it as a trade. A 760 score with a 48% DTI can look better to an automated system than a 640 score with a 38% DTI. The system is estimating risk, not checking two boxes.
Across the wholesale programs Lendmire places files with, the first question is almost always which underwriting path the file takes. The automated path allows a higher ratio. The manual path is stricter and asks for more reserves, which are the months of payments you hold in savings after closing. A borrower who is capped at 45% by hand can often be approved above that in an automated finding, and that gap is why two lenders can give the same borrower different answers.
You can see the programs side by side on Lendmire's refinance programs page. The table below shows the core numbers.
| Program | Credit score | DTI | Leverage and key condition |
|---|---|---|---|
| Conventional rate-and-term | 620 decision score | 50% automated; 36–45% manual | 95% LTV; 97% in first-time-buyer cases |
| Conventional cash-out | 620 score; 680 for the no-MI lane | 50% automated | 80% LTV one-unit; 75% two to four units |
| Jumbo | 660 decision score | 50% on fixed lanes | Up to 90% LTV; loans to $5,000,000 |
| FHA Streamline | Limited credit review | Not computed on the non-credit-qualifying path | No appraisal; net tangible benefit |
| VA IRRRL | No VA credit review | No VA income test | 0.5% funding fee unless exempt |
Every figure is subject to lender guidelines and full file review. Nothing here is a commitment to lend.
How Is DTI Calculated?
Add up your monthly debt payments, then divide by your gross monthly income. The new mortgage payment goes in, not the old one. That payment includes principal, interest, property taxes, homeowners insurance, and any HOA dues. Add your car loans, student loans, credit card minimums, and other recurring debts.
Run it with percentages. Say your new housing payment equals 28% of your gross monthly income. Your other debts equal 14%. Your DTI is 42%.
Now run a cash-out version. The larger loan lifts your housing payment to 33% of income. The other debts stay at 14%. Your DTI is now 47%. Same borrower, same income, higher ratio, and a very different file.
That is the core logic of a refinance. A new loan that lowers your payment can improve DTI. A cash-out loan that raises it can push you past a limit. Lenders also look at whether the new loan makes sense for you, not only whether the ratio fits.
Some debts may drop out of the count. A common example is an installment loan with only a few payments left. A lender decides how to treat it under the program's guidelines.
What Do Conventional Refinances Require?
Conventional refinances run on automated findings first. The automated system can approve a file with a total ratio up to 50%. Under Fannie Mae's Selling Guide on debt-to-income ratios, a loan that lands above 50% in automated underwriting is not eligible for delivery. The same guide caps manually underwritten loans at 45%.
On the wholesale programs Lendmire works with, manual files sit at 36% or 45%. The higher tier needs the score and reserves that the agency's Eligibility Matrix calls for. If you are at 40% DTI, a manual file might need stronger credit and more months of savings than an automated one would.
Credit score has changed shape too. Fannie Mae announced that fixed minimum credit scores no longer apply to loans submitted to its automated system. The system now weighs the full risk picture. (That does not mean a 540 score sails through. Lenders still set their own floors.)
The wholesale conventional lanes begin at a 620 decision score. An adjustable-rate loan under manual underwriting starts at 640. Score also shows up as pricing, because the agencies charge adjustments that grow as the score drops and the LTV rises. A borrower can clear the minimum and still pay more for a thin score.
On leverage, a rate-and-term refinance on a one-unit principal residence goes to 95% LTV. It reaches 97% where the existing loan is agency-owned and the first-time-buyer program allows it. The new loan pays off the first mortgage, the closing costs, and any purchase-money second lien. Cash back is incidental. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.
Above 80% LTV, mortgage insurance applies. You can request cancellation at 80% of the original value with a good payment history, no subordinate liens, and no decline in value. The servicer must end it automatically at 78%. Final terms depend on lender guidelines, property type, leverage, and the borrower's complete credit picture.
What Does an FHA Streamline Check?
An FHA Streamline refinances a loan that is already FHA-insured. It checks far less than a standard refinance. There is no appraisal, credit review is limited, and the refinance has to pass the net tangible benefit test.
The FDIC's summary of the program explains the two paths. On the non-credit-qualifying path, the lender does not have to compute DTI. On the credit-qualifying path, the lender does calculate it, but there is no hard cutoff because you can convert to the non-credit-qualifying path. No cash may come out of the home.
Student loans are an FHA quirk. FHA policy counts a payment in your DTI even when the loan is deferred. Lenders use either the documented payment or a calculated amount.
One more point. FHA Streamline is not the same as an FHA rate-and-term refinance. That loan reaches 97.75% LTV and requires an appraisal. The program is also not a free pass. Some lenders layer their own score or ratio requirements on top, so the program's flexibility and a given lender's flexibility are different things. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
What Does a VA IRRRL Check?
The VA Interest Rate Reduction Refinance Loan is for borrowers who already hold a VA loan. It must be a VA-to-VA refinance. According to the VA Lenders Handbook, no appraisal, credit information, or underwriting is generally required on an IRRRL. Exceptions are laid out elsewhere in that chapter.
In practice: no VA appraisal, a net tangible benefit test, and a 0.5% funding fee unless you are exempt. Seasoning is the later of 210 days and six payments on the loan being refinanced. The funding fee is a government charge, described here as a mechanic and not a price.
VA sets no credit floor on an IRRRL. Individual lenders may. A veteran with a rough credit stretch may find that one lender says no and another says yes, because the lender's rules differ from the VA's. Ask which rules are the program's and which are the lender's.
How Do Jumbo Refinances Differ?
Jumbo loans exceed the conforming limit, so they sit outside the agency programs. The lanes Lendmire places start at a 660 decision score. Leverage reaches 90%, loans run to $5,000,000, and fixed-rate lanes carry a 50% ratio ceiling.
A jumbo file leans harder on reserves and documentation, since the loan is bigger and there is no agency backstop. For the full tier-by-tier detail, see Lendmire's piece Jumbo Cash-Out Credit Score and DTI Requirements by Lane.
Where Does Cash-Out Tighten the Rules?
Cash-out refinances get stricter on almost every dial. The conventional limit is 80% LTV on a one-unit principal residence. It drops to 75% for two- to four-unit principal residences, second homes, and investment property. (Occupancy decides leverage. That is the one-sentence answer to the rental question.) Terms depend on the lender's guidelines, the property type, the leverage, and a full review of the credit profile.
Seasoning applies. The first mortgage being paid off must be at least 12 months old, counted from note date to note date. A borrower must have been on title for six months. Delayed financing, inheritance, and legal-award exceptions exist.
One wholesale lane reaches 89.99% LTV with no mortgage insurance. It requires a 680 score, a 50% ratio, a thirty-year fixed rate, a primary residence, a conforming balance, and its own six months of seasoning. Texas homestead cash-outs are capped by the state constitution, and that lane is not written there. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.
Cash-out also hits DTI directly. A bigger loan means a bigger payment. In automated underwriting, reserves can come into play once DTI passes 45%.
Where the General Rule Breaks
The tables give you the center of the road. These are the edges.
- No credit score. Borrowers with thin files may use nontraditional credit history. The ratio ceiling can be lower for manually underwritten loans in that case.
- A co-borrower who does not live in the home. The occupying borrower's own DTI is capped lower on manual loans. Adding a co-signer does not erase your own ratio.
- New debt before closing. Open a car loan mid-process and the file can be re-underwritten. If the new debt pushes you over the limit, the loan can become ineligible. Skip new credit until you close.
- A fresh credit pull by the lender. A new report can trigger re-underwriting too.
- Credit events. Agency waiting periods apply: four years from a chapter 7 discharge, seven from a foreclosure, and four from a short sale or deed-in-lieu. Documented extenuating circumstances can shorten them.
- High-balance conforming loans. These must be underwritten through the automated system.
- Second homes. The FHA Streamline can cover them. A conventional limited cash-out is generally aimed at the principal residence.
The 43% figure deserves a note. The CFPB's assessment of the ability-to-repay rule describes the old General QM test, which capped total ratio at 43%. That cap no longer defines the federal test. Lenders still have to consider and verify your DTI, but the number you hear most often is not a federal ceiling.
Five Borrower Profiles
Run these as patterns, not predictions. Each is subject to lender guidelines and review.
| Profile | Likely path | Why |
|---|---|---|
| Strong score, DTI in the high 40s | Conventional, automated | Score buys ratio room |
| 640 score, DTI in the low 30s | Conventional or FHA rate-and-term | Low DTI offsets thinner score |
| Existing VA loan, spotty credit | VA IRRRL | No VA credit review |
| Existing FHA loan, payment lowering | FHA Streamline | No appraisal; limited credit check |
| Large balance, 700+ score | Jumbo | Score clears the 660 start |
The second profile is worth a second look. A 640 score is above the 620 start, so a low-DTI file usually has options. The decision often comes down to mortgage insurance and total cost, not eligibility.
Fix Score or DTI First?
Fix whichever one is the binding constraint. That sounds obvious, but borrowers often guess wrong.
If your DTI is above 45%, work on DTI. Paying off an installment loan removes its payment from the ratio entirely. A credit card payoff does the same for the minimum, and it also helps your score through lower utilization. That one move can fix both numbers.
If your DTI is under 40% and your score is below 640, work on score. Pay balances down, fix errors on the report, and avoid new accounts. Score and DTI are separate measures, and income is not on your credit report. Raising income, for example, does not move your score.
If you are close on both, a different program might fit better than waiting. A borrower at 95% LTV who gets close to 80% could shed mortgage insurance entirely. Sometimes the most useful move is changing the structure, not the numbers. Final terms depend on the lender's guidelines, the property type, and the borrower's complete credit picture.
Running It on Your Own Home
The right program depends on your loan today, your equity, and your budget. If you are weighing a refinance and want the break-even run on your own numbers, Lendmire can help you compare the programs on the same home.
Frequently Asked Questions
What is the lowest credit score that can work for a refinance?
It depends on the program. The wholesale conventional lanes Lendmire works with start at a 620 decision score, and jumbo starts at 660. FHA Streamline and VA IRRRL involve limited or no credit review, though individual lenders may add floors. A higher score also tends to improve pricing.
What is the highest DTI allowed on a refinance?
On conventional loans, the ceiling is 50% when the automated system approves the file, and 45% at most for manual underwriting. Jumbo fixed lanes also use 50%. FHA Streamline on the non-credit-qualifying path does not compute DTI. A ceiling is not a promise, because the lender still reviews the whole file.
Does a streamline refinance check my credit?
Usually very little. An FHA Streamline involves limited credit review. A VA IRRRL generally needs no credit information or underwriting under VA rules. But lenders can add their own requirements, so a program with no hard floor can still meet a lender with one.
Does cash-out change my DTI?
Yes. A larger loan means a larger payment, and the new payment goes into the ratio. A borrower who fits a rate-and-term refinance can exceed the limit once cash comes out. Cash-out also carries lower LTV caps, 80% on a one-unit home.
Which matters more, score or DTI?
Neither wins outright. Automated systems weigh them together, so strength in one can offset weakness in the other. Score also drives pricing. DTI drives whether the payment fits your budget. Most files are decided by how the two combine.
For your own numbers, request a scenario review with Lendmire.
About Lendmire
As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and home buyers in 16 states with FHA, VA, conventional and jumbo purchase and refinance loans arranged through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and the agency guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your home or investment property. No commitment required.
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. Fannie Mae Selling Guide B3-6-02, Debt-to-Income Ratios
2. Fannie Mae Selling Guide Announcement SEL-2025-09
3. FDIC Summary: FHA Streamline Refinance
4. VA Lenders Handbook, Pamphlet 26-7, Chapter 6
5. CFPB's assessment of the ability-to-repay rule
This article is part of Lendmire’s Refinance series — every loan program’s qualification details, guidelines, and scenarios live on the loan options page.
Related reading: Cash-Out Refinance vs. 401(k) Loan for a Down Payment · How a Cash-Out Refinance Handles a Blanket Loan Release Clause · Cash-Out Refinance Max LTV for Homeowners Sizing Their Loan
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
Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.